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JP2012039553

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JP2012039553
An object of the present invention is to provide a speaker device which utilizes the characteristics
of a thin and flexible electrostatic type surface speaker by using both an electrostatic type
surface speaker and a conventional speaker. A surface speaker panel (9) has a surface speaker
(22) stretched around a frame (21), and the surface speaker (22) is covered with a punching
panel plate (23). The upper front plate 8 extends in the left-right direction of the housing, and
has a grid-like framework in which a plurality of through holes (sound holes) 8 a are formed. The
cone speaker 10 is disposed such that the front opening 10a is located in the left end region of
the electronic musical instrument. The surface speakers 22 are disposed on the front surface of
the upper front plate 8 over a width substantially the same as the width in the key arrangement
direction. The opening area facing the front opening 10 a of the cone speaker 10 completely
overlaps the opening area facing the surface speaker 22. [Selected figure] Figure 1
Speaker device
[0001]
The present invention relates to a speaker apparatus that uses both an electrostatic surface
speaker and a conventional speaker. As an example, it is used to output musical tones in an
electronic keyboard instrument.
[0002]
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A thin surface speaker is known as an electroacoustic transducer. For example, an electrostatic
speaker (also referred to as a capacitor speaker) driven by applying a voltage between the
electrodes and utilizing a cloning force, a device using a film having a piezoelectric characteristic,
and the like are known. In the plane speaker, as the area of the flat plate increases, the directivity
of the sound becomes stronger in the direction perpendicular to the flat plate, and as a result, the
sound reaches far.
[0003]
Among these, thin and flexible electrostatic speakers are attracting attention as electrostatic
speakers. This is thin and light as well as flexible, so it can be bent, and there is a property that
no stress remains after bending and it is difficult to return to the original shape (see Patent
Documents 1 and 2). A curtain speaker is realized by connecting a plurality of electrostatic type
speakers so as to be foldable utilizing such characteristics, and it is known that the sound field
can be freely controlled (Patent Document 1) 2). However, the arrangement and mounting
structure for using a surface speaker such as an electrostatic speaker and taking advantage of its
features have not been sufficiently studied.
[0004]
JP, 2010-68053, A JP, 2008-28652, A
[0005]
The present invention has been made to solve the above-mentioned problems, and it is thin and
flexible by using an electrostatic type surface speaker and a conventional speaker in combination
and devising their arrangement and mounting structure. An object of the present invention is to
provide a speaker device utilizing the features of a certain electrostatic type surface speaker.
[0006]
According to the present invention, in the invention described in claim 1, in the speaker device, a
speaker (10 in FIG. 1) for reproducing a low frequency band and a case (1, 2,. 3 and 5), and an
electrostatic type surface speaker (22), and one or more sound holes (8a) are formed in a plate
body (8) which is a part of the outer surface of the housing, The low frequency range
reproduction speaker (10) is disposed so that the front opening (10a) and a part of the opening
area by the one or more sound holes (8a) face each other, and the electrostatic type The surface
speaker (22) is disposed to face the one or more sound holes (8a), and has an opening area
facing the front opening (10a) of the low band reproduction speaker (10), and The opening area
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facing the electrostatic surface speaker (22) at least partially overlaps .
[0007]
The electrostatic type surface speaker is a thin speaker that can be regarded as an approximate
two-dimensional surface, and is a flat and thin flat plate shape, but a curved surface obtained by
curving a thin flat plate, and any curved surface The surface speaker of arbitrary forms, such as a
surface speaker which formed the bending surface, is also possible.
The flat-plate electrostatic type surface speaker generates a plane wave, so that even if the
listening position is away from the electronic keyboard instrument, the attenuation is small and it
sounds well.
On the other hand, even if the listening position is at the close position, it does not feel noisy.
On the other hand, in the case of a curved surface speaker in which a curved surface is formed,
the directivity angle of the sound wave is wide-angle on the convex side of the curved surface,
and the sound wave is focused on the concave side of the curved surface. However, the sound
pressure of the surface speaker is largely attenuated in the low frequency range, and increases as
the frequency increases. However, the middle and high frequency ranges exhibit flat frequency
characteristics due to area interference. Here, as the area of the surface loudspeaker (the area of
the diaphragm) is made larger, the sound pressure in the bass region is increased by the area.
However, there is a limit to the reproduction of the bass range. On the other hand, in the
conventional speaker, for example, a dynamic (electrodynamic) cone speaker (hereinafter simply
referred to as a "cone speaker"), the sound pressure is not relatively lowered even in the bass
range. In particular, a large diameter cone speaker called a woofer speaker is suitable for bass
range reproduction. However, the cone speaker is not sharp in directivity, and the sound in
antiphase output from the back of the diaphragm goes around to the front of the diaphragm, so
the bass range is lowered, and the directivity in particular is higher than the midrange. It is easy
for disturbance to occur. Therefore, by using both the electrostatic type surface speaker and the
low frequency range reproduction speaker in combination, the disadvantages of both are
compensated. Although the above-described cone speaker is used as the bass range reproduction
speaker, the present invention is not necessarily limited to the woofer speaker, and any speaker
that reproduces the bass range may be used.
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[0008]
In the case of using both an electrostatic type surface speaker and a low frequency range
reproduction speaker, an opening area facing the front opening of the low frequency range
reproduction speaker and an opening area facing the electrostatic type surface speaker at least
partially Therefore, in the housing of the speaker device, the area for arranging the low-range
reproduction speaker and the electrostatic surface speaker can be small. Since the electrostatic
type surface speaker has a film shape and is acoustically transparent, even if the opening areas
overlap, the sound output from the low-range reproduction speaker is also output to the front.
[0009]
Here, the sound hole (8a) is a through hole or the like for passing sound. The open area may be
formed by a plurality of sound holes or may be formed by only one large through hole. The low
frequency range reproduction speaker (10) is a part of the outer surface of the housing and is
disposed in the inner housing than the plate (8) in which the sound hole is formed. On the other
hand, the electrostatic type surface speaker may be disposed on the outside side of the abovedescribed plate body, or may be disposed in a housing inside of the above-described plate body.
In the former case, the low frequency range reproduction speaker faces the above-described
plate with an electrostatic surface speaker interposed therebetween. It is desirable that the
surface speaker be disposed so that the front or back surface of its vibration surface and half or
more of the opening area by the through hole face each other, in other words, the front or back
surface of the vibration surface has an acoustic transmission area It is desirable to face more
than half of However, even if it is half or less, the sound generated from the front or back of the
vibrating surface may pass through the through hole. When there is a through hole in front of
the vibrating surface, the sound generated through this through hole is emitted to the outside,
and when there is a through hole on the back of the vibrating surface, the sound generated
through this through hole is the housing Since the air is emitted to the inside of the case, the air
layer which lowers the sound pressure of the low frequency range can not be formed on the
back, and it may also go out through the gap of the case to the outside.
[0010]
According to the present invention, in the invention as set forth in claim 2, in the speaker device
according to claim 1, the casing (1, 2, 3, 5 in FIG. 1) is a casing of an electronic musical
instrument, The plate body (8) which is a part of the outer surface of the housing is an elongated
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body, and the electrostatic type surface speaker (22) is elongated along the longitudinal direction
of the elongated body (8) It is a shape and is arrange ¦ positioned by the said elongate body (8).
By making the plate body long, the diaphragm of the electrostatic type surface speaker can be
expanded, and as the diaphragm expands, the sound pressure in the low range increases, so the
degree of decrease in the sound pressure in the low range becomes It becomes smaller.
[0011]
In the invention according to claim 3, in the speaker apparatus according to claim 2, the
electronic musical instrument (1, 2, 3, 4, 5 in FIG. 1) includes an electronic keyboard. The long
body (8) is a front plate of the electronic keyboard instrument, and the low frequency range
reproduction speaker (10) has a key whose front opening (10a) is the key of the keyboard (4)
The electrostatic surface speaker (22) is disposed to be located at an end region in the
arrangement direction, and the electrostatic type surface speaker (22) has a width substantially
equal to or substantially the same as a width in the key arrangement direction of the keyboard
portion (4). It is disposed over the full width of the case of the electronic keyboard instrument
beyond the width. Here, the reason for defining approximately the same width is that the
width of the vibration area of the surface speaker is narrower than that of the outer frame when
the electrostatic type surface speaker is attached to the outer frame. When the frame is made to
coincide with the width of the keyboard portion (4) in the key arrangement direction, the width
of the vibration area of the electrostatic type surface speaker is slightly smaller than the width of
the keyboard portion (4) in the key arrangement direction. The reason for defining the entire
width of the case of the electronic keyboard instrument is equal to or less than the width of the
case of the electronic keyboard instrument is that there is a sense of incongruity if the width of
the electrostatic surface speaker is wider than the case of the electronic keyboard instrument.
The electronic keyboard instrument has a large width in the key arrangement direction of the
keyboard section. Therefore, if the surface speakers are disposed such that one side of the
surface speakers extends along the key arrangement direction as in the front plate of the
electronic keyboard instrument, the area of the surface speakers can be increased. At the same
time, there is no need to make the design (appearance) of the instrument unique or
uncomfortable.
[0012]
Further, since the plane wave emitted from the electrostatic type surface speaker has a sharp
directivity, the arrangement of the surface speaker that can be heard by the player is the upper
front portion of the keyboard section. Therefore, if electrostatic surface speakers are disposed on
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the upper front plate located at the upper front, propagation efficiency is good for the player
because of the sharp directivity even with a small area. If a lower front plate is provided between
the left and right legs under the shelf board of the instrument main body as in an upright
electronic keyboard instrument, an electrostatic type surface speaker is disposed on the lower
front plate. However, the diaphragm of the electrostatic type surface speaker can be expanded.
Since the electrostatic type surface speaker is disposed over the width substantially equal to or
more than the width in the key arrangement direction of the keyboard portion, it is expanded to
the left and right as viewed from the player. Therefore, it is possible to divide the electrostatic
type surface speaker into left and right to make it a stereo speaker. On the other hand, when only
one low frequency range reproduction speaker is used, the front opening portion is disposed on
the low frequency side of the key arrangement direction, and from the low frequency range of
the keyboard according to the key depression of the low frequency range of the keyboard. It
sounds like a musical tone is generated. When another low frequency range reproduction
speaker is used, two low frequency range reproduction speakers can be used as stereo speakers
by arranging this on the high range side in the key arrangement direction.
[0013]
In the citations and the like of the respective claims described above, the reference numerals in
parentheses attached to the items for specifying the invention are items for specifying the
invention in the mode for carrying out the invention described later. Is a code attached to
the corresponding one. This code only shows the correspondence between "items for specifying
the invention" and an example thereof. The item for specifying the invention is not limited to
an example associated with this code. In the inventions described in the respective claims
described above, an electrostatic type speaker is used as the surface speaker, but not limited to
the electrostatic type, a surface speaker of piezoelectric film type or the like can also be used.
[0014]
According to the present invention described above, the combined use of the electrostatic type
surface speaker and the conventional low range reproduction speaker widens the overall
reproduction range and does not require an extra arrangement space even by the combination
use thereof. effective.
[0015]
FIG. 1 is an external view of a portable synthesizer type electronic keyboard instrument
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according to an embodiment of the present invention.
It is 1st explanatory drawing which shows the surface speaker attachment structure in
embodiment shown in FIG. It is 2nd explanatory drawing which shows the surface speaker
attachment structure in embodiment shown in FIG. It is 1st explanatory drawing which shows the
other specific example of the surface speaker attachment structure in embodiment shown in FIG.
It is 2nd explanatory drawing which shows the other specific example of the surface speaker
attachment structure in embodiment shown in FIG. It is a block diagram of the electrostatic type
surface speaker which is one specific example of the surface speaker in embodiment shown in
FIG. FIG. 7 is a partial plan view showing a second specific example of the electrostatic surface
speaker shown in FIG. 6. FIG. 7 is a partial plan view showing a third specific example of the
electrostatic surface speaker shown in FIG. 6. It is a fragmentary top view which shows the 4th
example of a surface speaker of an electrostatic type ¦ mold shown in FIG. It is a functional block
diagram of the electronic keyboard instrument in embodiment shown in FIG.
[0016]
FIG. 1 is an external view of a portable synthesizer type electronic keyboard instrument
according to an embodiment of the present invention. Fig.1 (a) is a perspective view, FIG.1 (b) is
the schematic of the vertical cross section which looked at the direction of the arrow X from the
cutting plane line of Fig.1 (a). In FIG. 1 (a), 1 is a side plate (side portion), 2 is a top plate (roof), 3
is a bottom plate (bottom), and 4 is a keyboard. 5 is the upper front. The side surface portion
includes an upper front portion 5, a rear inclined plate 2b, a lower rear plate 3c, and a lower
front plate 3d in addition to the side plate 1. The upper front 5 has an upper front plate 8.
[0017]
The side plate (side portion) 1, the top plate (roof) 2, the bottom plate (bottom) 3 and the upper
front plate 8 constitute a housing of the electronic musical instrument. The instrument main
body is one having a keyboard portion 4 and an internal space 14 thereon. The musical
instrument main body unit incorporates an electronic circuit block (musical tone signal
generation unit) 13 that generates a musical tone signal by the user's key operation on the
keyboard unit 4. Here, on the top surface of the top 2, one or a plurality of horizontally long
linear holes 2 a are formed only in the front left region, that is, only in the low range of the
keyboard. Each linear hole 2a is paired with a linear plate 2c which is lowered by one step, and
the linear hole 2a becomes a through hole (sound hole). Strictly speaking, the gap between the
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linear hole 2a and the linear plate 2c is a through hole (sound hole). Operation panels 6a and 6b
are provided on the left and right sides of the center of the top 2, and a display 7 and an
operation panel 6c are provided at the center of the rear. The display 7 displays musical tone
parameters, and displays the music title and score of automatic performance in order to set the
operation of the electronic keyboard instrument. As shown in FIG. 1 (b), the back of the top 2 is
the rear inclined plate 2b. The bottom plate 3 is formed by assembling a front inclined bottom
plate 3b and a lower back plate 3c with respect to the substrate 3a, and the front inclined bottom
plate 3b is integrally formed with the lower front plate 3d.
[0018]
The side portion of the instrument main body has an upper front portion 5 between the top plate
2 (the roof portion) and the keyboard portion 4, and the surface speaker 22 is disposed on the
upper front plate 8 of the upper front portion 5. . As shown in FIG. 1 (b), the surface speaker
panel 9 has one surface of the housing, the surface speaker 22 is stretched on the frame 21, and
the surface speaker 22 is covered with the punching panel plate 23. is there. In this embodiment,
the surface speaker panel 9 is attached to the front surface of the upper front plate 8, whereby
the surface speaker 22 is disposed at a part of the instrument main body. Since the plane wave
emitted from the plane speaker 22 has sharp directivity, the arrangement of the plane speaker
22 that can be heard by the player is the upper front portion 5. Therefore, since the height of the
upper front portion 5 is low, the propagation efficiency is high for the player even if a large area
can not be secured.
[0019]
The upper front plate 8 is an elongated body extending in the left-right direction of the housing,
and has a grid-like framework in which one or more through holes (sound holes) 8 a for passing
sound are formed. Details will be described later with reference to FIGS. 2 and 3. In the example
described later, substantially the entire surface of the upper front plate 8 is the lattice portion 8
b. In addition, the cone speaker 10 is disposed in the left side area of the instrument main body
in the upper front portion 5 described above.
[0020]
The surface speaker 22 is disposed at a position separating the internal space 14 of the
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electronic musical instrument housing from the external world, and the sound output from the
surface speaker 22 propagates to both the internal space 14 and the external world. At such an
arrangement position of the surface speaker 22, the sound output from the front surface of the
surface speaker 22 is emitted to the outside through the punching panel plate 23. In addition,
the sound output from the back of the surface speaker 22 is transmitted to the internal space 14
through the large number of through holes 8a of the upper front plate 8 and vibrates the
housing portion, for example, the top plate 2 or the substrate 3a. As a result, the sound is
secondarily emitted to the outside world, and the internal space 14 is propagated to the outside
world from the plurality of linear holes 2a and the like released to the outside world.
[0021]
The keyboard frame 4a of the keyboard unit 4 is mounted on the base plate 3a and the front
inclined bottom plate 3b, and the keyboard frame 4a is reinforced by a vertical rib 4b provided
below the keyboard between a predetermined key and its adjacent key. The key 4c and the black
key 4d are supported. The cone speaker 10 is attached to the frame plate 11 provided upright on
the substrate 3a, and the direction of the central axis CC of the front opening 10a is obliquely
above on the front. Therefore, the front opening 10 a is directed to the back of the upper front
plate 8 and the plurality of linear holes 2 a described above. The lower portion of the upper front
plate 8 is supported by the frame plate 11 by the holding member 12.
[0022]
In the illustrated example, the central axis CC of the front opening 10a faces upward at about 45
degrees with respect to the horizontal line. As this central axis CC approaches in the vertical
direction, the sound output from the back of the cone speaker 10 (sound in reverse phase to the
sound output from the front opening 10a) is also output from the upper front 5, and the front
opening This is undesirable because it causes phase interference with the sound of 10a, and the
output of sound directly transmitted to the player is reduced. The sound output from the linear
hole 2 a of the top 2 and the sound output from the back of the cone speaker 10 is not
significantly affected at the position of the player.
[0023]
The surface speaker panel 9 and the cone speaker 10 are disposed on the front surface and the
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back surface of the upper front plate 8 with the upper front plate 8 interposed therebetween.
The cone speaker 10 is disposed such that the front opening 10a and a part of the opening area
formed by the one or more through holes 8a face each other. In other words, the front opening
10 a faces a part of the acoustic transmission area, which is the sum of the areas of the plurality
of through holes 8 a in the upper front plate 8. In the illustrated example, the front opening 10 a
is disposed in the left end region of the instrument main body in the key arrangement direction
of the keyboard 4.
[0024]
On the other hand, the surface speakers 22 of the surface speaker panel 9 are disposed such that
the vibration surface thereof faces half or more of the opening area of the one or more through
holes 8a. In other words, the back surface of the surface speaker 22 is made to face half or more
of the above-mentioned sound transmission area. In the illustrated example, the surface speaker
22 has a shape that is elongated along the longitudinal direction of the upper front plate 8 and
covers the same width as the key arrangement direction of the keyboard 4 on the front surface of
the upper front plate 8. It is arranged. There are metered trees 4e and 4f on both sides of the
keyboard unit 4, and the width of the keyboard unit 4 including the metered trees 4e and 4f in
the key arrangement direction is almost the same as that of the surface speaker 22. Therefore,
the width of the surface speaker 22 can be increased to increase the area of the surface speaker
22, so that the sound pressure in the bass region is increased, and the degree of decrease in the
sound pressure in the bass region is reduced.
[0025]
The surface speaker panel 9 and the cone speaker 10 overlap each other as viewed from the
performer. Therefore, the opening area facing the front opening 10 a of the cone speaker 10
described above at least partially overlaps the opening area facing the surface speaker 22. In the
illustrated example, they completely overlap. Since the electrostatic type surface speaker 22 has
a film shape and is acoustically transparent, even if the opening regions overlap, the sound
output from the cone speaker 10 is also output to the front. The surface speaker 22 and the cone
speaker 10 described above output a sound corresponding to the musical tone signal output
from the electronic circuit block (musical tone signal generation unit) 13.
[0026]
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10
The surface speaker 22 emits sound from its front and back. In the surface speaker 22, the air
spring of the air layer on the back surface resonates with the diaphragm, and the sound pressure
decreases at a frequency lower than the resonance frequency. Here, the resonance frequency is
higher as the air layer on the back surface is thinner. Therefore, when the surface speaker 22 is
disposed outside the plate (upper front plate 8 in the figure), an air layer having a sufficient
thickness needs to be formed on the back surface of the surface speaker 22. This air space may
be 1 cm, and 3 cm is sufficient. However, if one or more through holes 8a are formed in the plate
(upper front plate 8), the sound output from the back of the surface speaker 22 can be released
to the side of the internal space 14 of the housing. Even if the air layer on the back side of the
surface speaker 22 is thin, it compensates for the fact that the above-described resonance
frequency does not become too high. The sound emitted from the front opening 10 a of the cone
speaker 10 is transmitted through the surface speaker 22 and emitted to the front, and is also
emitted from the linear hole 2 a of the top 2.
[0027]
The surface speakers may be disposed on the front inclined bottom plate 3b of the bottom plate
(bottom surface portion) or on the rear inclined plate 2b. The lower rear plate 3c shown in the
drawing has two upper and lower stages at the front and rear thereof, and surface speakers may
be disposed on the upper rear upper plate 3e. A large number of through holes (sound holes) can
be opened in the front inclined bottom plate 3b, the rear inclined plate 2b, and the rear upper
bottom plate 3e to arrange the surface speakers. The surface speakers may be disposed at a
plurality of locations. In addition, the surface speakers may be disposed outside the housing of
the electronic musical instrument, or may be disposed inside the housing. On the other hand, the
cone speaker 10 may be disposed on the substrate (shelf plate) 3a, or may be disposed at a
plurality of places of the electronic musical instrument.
[0028]
FIG. 2 is a first explanatory view showing a surface speaker mounting structure in the
embodiment shown in FIG. 2 (a) is a partial enlarged view of the vertical cross section shown in
FIG. 1 (b), and FIG. 2 (b) is a perspective view showing a mounting structure of the holding
member 12. As shown in FIG. In the illustrated example, the upper front plate 8 is integrally
formed with the top plate 2. The upper front plate 8 generally has a grid portion 8b in which a
plurality of through holes 8a are formed, and mounting holes 8c and 8d are formed in the
peripheral region of the grid portion 8b.
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[0029]
The lower portion of the upper front plate 8 is folded forward and has a stepped portion 8e, and
is attached to the holding member 12 by a screw member (not shown) on the lower surface of
the stepped portion 8e. The holding member 12 is bent vertically at a front portion thereof, and a
lower portion thereof is horizontally cut and raised to form a mounting portion 12a, in which a
screw hole 12b for mounting the upper front plate 8 is formed. . The holding member 12 has a
mounting portion 12c which is vertically bent at a right angle in the rear portion, and a mounting
hole 12d for mounting the holding member 12 on the frame plate 11 shown in FIG. 1B is formed.
There is.
[0030]
The frame 21 of the surface speaker panel 9 is a support of the surface speaker 22 provided with
a large rectangular opening 21 a at the center. Engaging protrusions are formed on two or more
places in the key arrangement direction of the keyboard 4 on the back side of the upper edge
and the lower edge. As shown in an enlarged view in FIG. 3, the engagement protrusion is
constituted by an elastic deformation portion 21 b and a locking portion 21 c, and an elastic
deformation portion 21 e and a locking portion 21 f. The surface speaker 22 is stretched from
the front surface of the frame 21 around the upper edge and the lower edge of the frame 21 to
the back surface of the frame 21 and fixed to the frame 21 by an adhesive or the like. The upper
end portion 23 a of the punching panel plate 23 draws a curved surface along the curved surface
of the upper portion of the frame 21, is bent at a right angle along the front end surface of the
top plate 2, and then contacts the front surface of the upper portion of the frame 21 It is bent as
it is. The screw member 25 is screwed through the mounting hole 21 d of the frame 21 to the
screw hole 23 b of the folded portion of the face speaker 22 and the punching panel plate 23. On
the other hand, the lower end portion 23c of the punching panel plate 23 is bent at a right angle
from the front surface of the frame 21 to which the surface speaker 22 is fixed. The upper
surface of the lower end portion 23c overlaps the bottom surface bt (see FIG. 3) of the surface
speaker 22 in a state where the attachment portion 23d is in contact with the surface speaker
22.
[0031]
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FIG. 3 is a second explanatory view showing the attachment structure of the surface speaker
panel 9 in the embodiment shown in FIG. The frame 21 and the surface speaker 22 are screwed
to the upper end portion 23 a of the punching panel plate 23 shown in FIG. 2 by the screw
member 25. Further, the mounting portion 23d of the punching panel plate 23 is formed by
cutting and raising from the lower end portion 23c, and a screw hole 23e is formed here. The
screw member 33 is screwed from the mounting hole 21 g to the screw hole 23 e of the
punching panel plate 23 through the frame 21 and the surface speaker 22. As a result, the lower
end portion 23 c of the punching panel plate 23 becomes the bottom surface of the surface
speaker panel 9. The above-described punching panel plate 23 may protect the surface speaker
22 and transmit sound, and a plurality of lines may be made of a net stretched on a frame (not
shown) or a synthetic resin plate. It may be a speaker grill in which a plurality of through holes
(sound holes) are formed.
[0032]
The surface speaker panel 9 (FIG. 3) mentioned above has the engagement projections (elastic
deformation portion 21b and locking portion 21c, elastic deformation portion 21e and locking
portion 21f), respectively, the mounting holes (engagement of the upper front plate 8). Attached
parts) 8c (Fig. 2) and 8d (Figs. 2 and 3). When the locking portions 21c and 21f are pushed into
the front surfaces of the mounting holes (engaging portions) 8c and 8d, the elastically
deformable portions 21b and 21e are bent, and the locking portions 21c and 21f penetrate the
mounting holes 8c and 8d. By slightly returning the bending of the elastically deforming portions
21b and 21e, the locking portions 21c and 21f are engaged and fixed to the corner portions on
the back surface of the mounting holes 8c and 8d. The lower end portion 23 c of the punching
panel plate 23 which is the bottom surface of the surface speaker panel 9 is mounted on the step
portion 8 e of the upper front plate 8. In this manner, the surface speaker panel 9 can be easily
attached and fixed to the upper front plate 8. Furthermore, there is an effect that the flicker of
the frame 21 due to the vibration of the surface speaker 22 is not generated by the elasticity of
the elastic deformation portions 21 b and 21 e described above.
[0033]
Here, the locking portions 21c and 21f mean engaging members on the side attached to the
housing, and the engaging portions (mounting holes 8c and 8d) mean engaging members on the
housing side. The mounting holes 8c and 8d described above are an example of the fastening
portions, and the fastening portions are not necessarily limited to the mounting holes. In the
illustrated example, the elastically deformable portions 21b and 21e are provided on the side of
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the locking portion, and constitute an engagement protrusion. However, there may be an
elastically deformable portion on the side of the fastening portion. For example, on the side of the
upper front plate 8, engaging projections (elastically deformable parts) similar in shape to the
above-described engaging projections (elastically deformable parts 21b and locking parts 21c,
elastic deformation parts 21e and locking parts 21f) described above It is a case where it has a
stop part and has an attachment hole of the shape similar to attachment holes 8c and 8d
mentioned above in the side of frame 21. In addition, the elastically deformable portion may be
provided on both the side of the locking portion and the side of the engagement portion.
[0034]
On the side where the back surface and the upper side face of the surface speaker panel 9 are in
contact with each other, in the illustrated example, the vibration proofing member 31 is pasted in
the key arrangement direction on the end of the surface speaker 22. On the other hand, on the
side where the back surface and the bottom surface of the surface speaker panel 9 are in contact
with each other, in the illustrated example, the anti-vibration member 32 is pasted in the key
arrangement direction on the end of the surface speaker 22. These vibration isolation members
31 and 32 are, for example, vibration isolation rubber members, and after the surface speaker
panel 9 is mounted on the upper front plate 8, they intervene in the gap between the two and the
surface speaker panel 9 inadvertently vibrates. Don't let go or go.
[0035]
The surface speaker panel 9 described above can also be removed. In FIG. 2, there is a slight gap
between the linear hole 2a and the linear plate 2c in the vicinity of the engagement portion
between the locking portion 21c and the mounting hole 8c described above (near to the extent
that it can act on the engagement). It is formed. Here, an elongated tool such as a flat-blade
screwdriver 24 is inserted, and the locking portion 21c of the engagement protrusion is pushed
down to bend the elastically deformable portion 21b to release the engagement between the
locking portion 21c and the mounting hole 8c. The locking portion 21c is pulled out of the
mounting hole 8c. Thereafter, the surface speaker panel 9 is floated upward, whereby the
engagement between the locking portion 21f of the lower engagement protrusion and the
attachment hole 8d is released. In this manner, the engagement protrusions of the frame 21 can
be disengaged from the attachment holes 8 c and 8 d, and the surface speaker panel 9 can be
detached from the upper front plate 8. The surface speaker panel 9 is provided with engaging
portions at a plurality of positions in the key arrangement direction. In the engagement portion
where the linear hole 2a described above is not present, a through hole into which a tool is
04-05-2019
14
inserted is formed in the top plate 2 (not shown).
[0036]
The surface speaker 22 mentioned above may receive supply of a monaural signal. However,
since the surface speakers 22 are long in the key arrangement direction, they can be attached to
the upper front plate 8 as the surface speaker panels 9 divided into the surface speakers 22L for
the left channel and the surface speakers 22R for the right channel. 9 itself may be divided into a
left channel and a right channel and mounted on the upper front plate 8. At that time, the cone
speakers 10 in the left side area shown in FIG. 1A may be disposed in the right side area of the
upper front 5, and these may be used as stereo speakers.
[0037]
In the above description, the drive current is supplied to the surface speaker 22 by using an
input line drawn from the surface speaker 22 and an output line of the drive circuit in the
electronic circuit block 13 using a connector such as a plug or socket. It may be electrically
connected. At that time, a plurality of plugs for electrical connection are formed in the frame 21
separately from the engaging projections (elastically deformable portions 21b and 21e, and the
locking portions 21c and 21f) described above, and the explanation has been made above. A
plurality of sockets for electrical connection may be formed on the upper front plate (supporting
body) 8 separately from the mounting holes (engaging portions) 8c and 8d. In this case, in a state
in which the engagement protrusion and the mounting hole are in mechanical engagement, the
respective electrical contacts of the plurality of plugs and the respective electrical contacts of the
plurality of sockets contact each other to electrically Connected
[0038]
Alternatively, as described below, the above-mentioned engagement projections (elastically
deformable portions 21b, locking portions 21c, elastically deformable portions 21e, locking
portions 21f) and the mounting holes 8c and 8d are electrically contact members, respectively. In
addition to providing the engagement protrusion and the mounting hole as a mechanical
coupling member, the connector can also be an electrical connector (plug and socket). There are
three electrodes of the surface speaker 22. Therefore, the surface speaker panel 9 uses at least
three engaging projections in the case of monaural and at least six engaging projections in the
04-05-2019
15
case of stereo.
[0039]
4 and 5 are explanatory views showing another specific example of the surface speaker
attachment structure in the embodiment shown in FIG. In the drawings, the same parts as those
in FIGS. 1 to 3 are denoted by the same reference numerals. FIG. 4A is a partially enlarged view
of the upper portion of the frame 21 shown in FIG. Illustration of the surface speaker 22 is
omitted. FIG. 4 (b) is a vertical cross-sectional view of FIG. 4 (a), and is a view of the vertical cross
section in the X direction, along with a portion of the surface speaker 22, top plate 2, and upper
front plate 8 doing.
[0040]
In FIG. 4 (a), the engaging projections (elastically deformable portions 21b, locking portions 21c)
become plugs. A through hole 21i is formed in the inclined surface 21h of the locking portion
21c and communicates with the groove 21j of the elastically deformable portion 21b. The groove
21 j communicates with the shallow groove 21 k formed on the upper end surface of the frame
21. Reference numeral 41 denotes a conductive elastic member, which is a bent flat member
such as peak portions 41a, 41c and 41e and valley portions 41b and 41d therebetween. The
peaks 41a and 41c are triangular, the valleys 41b and 41d are flat, and the peak 41e is curved.
In the conductive elastic member 41, the peak 41c is inserted into the groove 21j, the peak 41e
is fitted into the shallow groove 21k, and the peak 41a is press-fitted and fixed in the through
hole 21i. The valleys 41 b and 41 d place a gap between the valleys 41 b and 41 d and the
bottom of the groove 21 j.
[0041]
On the other hand, the mounting hole 8c of the upper front plate 8 shown in FIG. 4B is a socket.
A conductive member 42 is provided at the upper corner portion on the back side of the
mounting hole 8c. The conductive member 42 is bent at a right angle twice, and is fixed to the
top plate 2 by a screw member 43 on the back surface of the top plate 2. When the locking
portion 21c of the engagement protrusion described above engages with the mounting hole 8c,
the second peak portion 41c of the conductive elastic member 41 contacts the conductive
member 42, and the elastic force of the conductive member 42 causes the conductive member
04-05-2019
16
42 to Press. As a result, when the upper portion of the frame 21 engages with the upper front
plate 8, the pair of connection terminals is electrically connected in the above-described one
engagement portion. The peak portion 41 e of the conductive elastic member 41 is connected to
one electrode of the surface speaker 22 by surface contact with the connection terminal 22 a of
the surface speaker 22. On the other hand, the conductive member 42 is connected to the
electronic circuit block 13 shown in FIG. 1B by a connection line (not shown).
[0042]
The elastic deformation portion 21b remains elastic even during engagement, and the upper
surface (the side having the groove 21j) of the elastic deformation portion 21b presses the upper
surface (the lower surface of the top plate 2) of the mounting hole 8c. . Therefore, it can be
designed such that the upper surface of the elastically deformable portion 21b does not contact
the upper surface of the mounting hole 8c during engagement, and the conductive elastic
member 41 only presses the conductive member 42. In this case, the engaged state is maintained
by both elastic forces of the elastic deformation portion 21 b and the conductive elastic member
41. Alternatively, the conductive elastic member 41 may be replaced with a simple conductive
member that can ignore elastic deformation, and the one that is in contact with the conductive
member 42 and pressed by only the elasticity of the elastic deformation portion 21b. it can.
[0043]
FIG. 5A is a partially enlarged view of the lower portion of the frame 21 shown in FIG. Illustration
of the surface speaker 22 is omitted. In order to clarify the illustration of the conductive elastic
member 51 to be described later, the outline of the engaging protrusion (elastically deformable
portion 21e, locking portion 21f) is shown by an alternate long and short dashed line, and the
conductive elasticity hidden in the engaging protrusion The outline of the member 51 is
illustrated by a solid line. FIG. 5 (b) is a vertical cross-sectional view of FIG. 5 (a), and is a vertical
cross-section seen in the X direction, together with a portion of the surface speaker 22 and the
upper front plate 8. In the drawing, the same parts as those in FIG.
[0044]
In FIG. 5 (a), the engaging projections (elastically deformable portions 21e, locking portions 21f)
become plugs. A through hole 21m is formed in the inclined surface 21L of the locking portion
04-05-2019
17
21f and communicates with the groove 21n of the elastically deformable portion 21e. The
groove 21 n communicates with the through hole of the frame 21, and an opening 21 o is
formed on the front surface of the frame 21. A conductive elastic member 51 has a contact
structure and a terminal structure. The contact structure includes valleys 51a and 51c, a ridge
51b between the valleys 51a and 51c, and a ridge 51d continuing to the valley 51c. The valleys
51a and 51c are triangular, and the ridges 51b and 51d are flat. The end of the mountain portion
51d is bent vertically and continues to the terminal portion structure. The terminal portion
structure is formed wider than the width of the peak portion 51d, and the end portions 51e and
51f in the width direction are formed in a U shape by being bent toward the contact structure
portion described above, In addition, a rectangular piece 51 g is cut and raised from the center in
the width direction toward the side of the contact structure. An attachment hole 51h and an
engagement protrusion 51i are formed on the attachment hole 51h in the rectangular piece 51g.
[0045]
The conductive elastic member 51 is inserted from the opening 21 o described above. The
valleys 51a, the ridges 51d, the valleys 51c, and the ridges 51b are inserted into the grooves 21n
of the elastically deformable portion 21e, and the valleys 51a are press-fitted and fixed to the
through holes 21m. The mountain portions 51 b and 51 d place a gap between the ridges 51 b
and 51 d and the ceiling surface of the groove 21 n. The end portions 51e and 51f are fitted in
the vertical grooves 21p of the frame 21, and as described later, the conductive elastic member
51 is a frame by screwing the screw member 52 from the mounting hole 51h to the frame 21. It
is fixed to 21.
[0046]
On the other hand, the mounting hole 8d of the upper front plate 8 shown in FIG. 5 (b) is a
socket. A conductive member 53 is provided at the lower corner of the rear surface side of the
mounting hole 8d. The conductive member 53 is bent at a right angle and fixed by a screw
member 54 on the back surface of the upper front plate 8. When the locking portion 21f of the
engaging projection described above engages with the mounting hole 8d, the second valley
portion 51c of the conductive elastic member 51 contacts the conductive member 53, and the
elastic force of the conductive member 53 causes the conductive member 53 to move. Press. In
this manner, when the lower portion of the frame 21 of the surface speaker panel 9 engages with
the upper front plate 8, a pair of connection terminals is electrically connected in the abovedescribed one engaging portion.
04-05-2019
18
[0047]
The elastically deformable portion 21e of the engaging projection remains elastic force during
engagement, and the lower surface (the side having the groove 21n) of the elastically deformable
portion 21e presses the lower surface of the mounting hole 8d. Therefore, it may be designed
such that the lower surface of the elastically deformable portion 21e does not contact the lower
surface of the mounting hole 8d during engagement, and the conductive elastic member 51 only
presses the conductive member 53. In this case, the engaged state is maintained by both elastic
forces of the elastic deformation portion 21 e and the conductive elastic member 51.
Alternatively, the conductive elastic member 51 can be replaced with a simple conductive
member that can ignore elastic deformation, and this can be brought into contact with the
conductive member 53 and pressed by only the elasticity of the elastic deformation portion 21e.
[0048]
In the terminal portion structure, the connection terminal 22b of the surface speaker 22 is
inserted into the gap between the end portions 51e and 51f and the rectangular piece 51g. In the
connection terminal 22b, the attachment hole 22c and the engagement hole (which may be an
engagement recess) 22d shown in FIG. 5A are formed. By aligning the engagement hole 22d with
the engagement protrusion 51i, the positioning between the attachment hole 22c and the
attachment hole 51h becomes easy. The conductive elastic member 51 is fixed to the frame 21
by screwing the screw member 52 to the frame 21 from the surface speaker 22, the attachment
hole 22c, and the attachment hole 51h, and at the same time, the connection terminal 22b of the
surface speaker 22. Makes contact with the rectangular piece 51 g of the conductive elastic
member 51, the conductive elastic member 51 is connected to one electrode of the surface
speaker 22. On the other hand, the conductive member 53 is connected to the electronic circuit
block 13 shown in FIG. 1B by a connection line (not shown).
[0049]
FIG. 6 is a structural view of a flexible surface speaker 60 which is a specific example of the
surface speaker 22 in the embodiment shown in FIG. 6 (a) is a schematic view showing the
layered structure of the surface speaker 60 open, FIG. 6 (b) is a partial plan view of the surface
speaker 60, FIG. 6 (c) is a partial cross section of the surface speaker 60, FIG. (D) is a
fragmentary sectional view which shows the other example of the surface speaker 60. FIG.
04-05-2019
19
[0050]
First, the main part of the laminated structure will be described. In FIGS. 6 (a) to 6 (c), the first
transparent electrode sheet 62 having acoustic transparency and the second fixed electrode
sheet 66 having acoustic transparency have a first acoustic transparency. A particularly thin and
flexible vibrating electrode sheet (vibrating film) 64 is stacked and disposed via the insulating
sheet 63 and the second insulating sheet 65 having acoustic transparency. The first insulating
sheet 63 and the second insulating sheet 65 are thin and flexible buffer materials (cushion
materials). The first fixed electrode sheet 62 and the second fixed electrode sheet 66 described
above are also thin and flexible. The sound output from the front surface of the vibrating
electrode sheet 64 passes through the first insulating sheet 63 and the first fixed electrode sheet
62 and is emitted from the front surface of the electrostatic speaker, and the sound of the
vibrating electrode sheet 64 The sound output from the back passes through the second
insulating sheet 65 and the second fixed electrode sheet 66 and is emitted from the back of the
electrostatic speaker.
[0051]
61 is a third insulating sheet having acoustic transparency, and 67 is a fourth insulating sheet
having acoustic transparency, which protect or waterproof the back of the electrostatic speaker,
It is also a cover to prevent electric shock. These are also flexible. Therefore, the surface speaker
60 is a flexible thin flexible electronic speaker as a whole. Except for the vibrating electrode
sheet 64 described above, the other first fixed electrode sheet 62, second fixed electrode sheet
66, first insulating sheet 63, second insulating sheet 65, third insulating sheet 61 The fourth
insulating sheet 67 is breathable. The third insulating sheet 61 and the fourth insulating sheet
67 can be omitted.
[0052]
68a to 68e and 69a to 69e are adhesive layers for partially supporting the vibrating electrode
sheet 64 by the first insulating sheet 63 and the second insulating sheet 65, and the width
thereof is narrow, For example, it is 4 to 10 [mm], it is flexible, and its thickness is thin, for
example, 0.1 to 0.5 [mm]. In the illustrated example, the adhesive layer is in the form of a tape,
and specifically, a double-sided adhesive tape is used. The vibrating electrode sheet 64 is
04-05-2019
20
supported at intervals by the adhesive layers 68a to 68e and 69a to 69e. Due to the adhesive
layers 68a to 68e and 69a to 69e, the vibrating electrode sheet 64 is located between the
vibrating electrode sheet 64 and the first insulating sheet 63 in a region where the adhesive
layers 68a to 68e and 69a to 69e do not exist. And, the space between the second insulating
sheet 65 is supported so as to be slightly separated.
[0053]
Since the vibrating electrode sheet 64, the first insulating sheet 63, and the second insulating
sheet 65 have flexibility, there is no problem even if they are in contact with each other. The first
insulating sheet 63 and the second insulating sheet 65 support the vibrating electrode sheet 64
and apply appropriate elastic stress to the vibrating electrode sheet 64. The adhesive layers 68a
to 68e and 69a to 69e are not essential for electrostatic surface speakers. However, the vibrating
electrode sheet 64 vibrates integrally with the first and second insulating sheets 63 and 65
having a buffer action while interacting with each other. Therefore, the adhesive layers 68 and
69 have the function of stabilizing the interaction between the vibrating electrode sheet 64 and
the first insulating sheet 63 and the second insulating sheet 65, rather than the spacer. The
adhesive layers 68 and 69 also serve to prevent the layers of the multi-layered laminated sheet
from being damaged or to prevent them from being wrinkled when the entire surface speaker 60
is bent.
[0054]
In FIG. 6C, the vibrating electrode sheet 64 is supported by the adhesive layers 68a to 68e on the
first insulating sheet 63 at equally-spaced first support positions, and by the adhesive layers 69a
to 69e. The two insulating sheets 65 are supported at the same first support position. The
distance between the first support positions was 1 cm to 10 cm, and 3.6 cm for the prototype. In
FIG. 6D, the vibrating electrode sheet 64 is supported by the adhesive layers 68f and 68g on the
first insulating sheet 63 at equally spaced first support positions, and by the adhesive layers 69f
and 69g. The two insulating sheets 65 are supported at equally spaced second support positions.
Since the first support position and the second support position are alternately arranged, the
vibrating electrode sheets 64 are alternately supported.
[0055]
04-05-2019
21
As shown in FIGS. 6 (b) and 6 (c), the end (the right end in the figure) of the surface speaker 60 is
preferably supported by the adhesive layers 68e, 69e, 68h and 69h. Layers of the respective
sheets are adhered to each other with an adhesive layer (double-sided adhesive tape) similar to
the adhesive layers 68e, 69e, 68h, and 69h or coated with an adhesive at the peripheral portion
of the surface speaker 60. Make sure not to leave. The peripheral portion of the surface speaker
60 is sewn, assembled with a synthetic resin, or attached to a frame (not shown).
[0056]
The vibrating electrode sheet 64 described above is formed by depositing a conductive metal
such as aluminum or coating a conductive paint on both sides or one side of a synthetic resin
thin film such as polyethylene terephthalate (PET) or polypropylene (PP). The thickness is several
[μm] to several tens [μm]. The first fixed electrode sheet 62 and the second fixed electrode
sheet 66 described above are formed by depositing a conductive metal such as aluminum or
coating a conductive paint on one side or both sides of polyethylene terephthalate. It is a
punching metal in which a large number of through holes 62a and 66a penetrating the thickness
thereof are formed. In this prototype, the thickness is 0.5 [mm]. As the first fixed electrode sheet
62 and the second fixed electrode sheet 66, a metal mesh may be used instead of the punching
metal, or a non-woven fabric with aluminum vapor deposition may be used. In the latter case, the
third insulating sheet 61 and the first fixed electrode sheet 62 can be integrated, and the fourth
insulating sheet 67 and the second fixed electrode sheet 66 can be integrated. The first
insulating sheet 63 and the second insulating sheet 65 described above are, for example, a
foamed synthetic resin or a non-woven fabric. The third insulating sheet 61 and the fourth
insulating sheet 67 described above are also, for example, foamed synthetic resin or non-woven
fabric, but the degree of freedom in material selection is large.
[0057]
FIG. 7 is a partial plan view showing a flexible electrostatic surface speaker 70 which is another
example of the surface speaker 22 in the embodiment shown in FIG. In the previous FIG. 6, the
adhesive layers 68a to 68e and 69a to 69e are arranged in parallel in the longitudinal direction
of the drawing. In FIG. 7, additionally, adhesive layers 71a, 71b, 71c are arranged in parallel in
the lateral direction of the drawing and arranged in parallel to each other. The illustrated
adhesive layers 71a and 71b are disposed at the same intervals as the adhesive layers 68a to
68d and 69a to 69d. If one grid-like adhesive layer is used instead of the two adhesive layers
arranged in the longitudinal direction and the lateral direction described above, the thickness of
the adhesive layer becomes uniform. The laminated cross-sectional structure of the surface
04-05-2019
22
speaker 70 is the same as FIGS. 6 (c) and 6 (d) except for the arrangement of the adhesive layer,
and therefore the illustration is omitted.
[0058]
In the example shown in FIGS. 6 and 7, the vibrating electrode sheet 64 and the first insulating
sheet 63, and the vibrating electrode sheet 64 and the second insulating sheet are formed by the
adhesive layers 68a to 68h, 69a to 69h, and 71a to 71c. 65 was glued. In addition to these, the
layer between the third insulating sheet 61 and the first fixed electrode sheet 62, the layer
between the first fixed electrode sheet 62 and the first insulating sheet 63, the second insulating
sheet 65 Between any layers of the second fixed electrode sheet 66 and the layers of the second
fixed electrode sheet 66 and the fourth insulating sheet 67 with an adhesive layer (double-sided
adhesive tape) (not shown) May be In particular, in the peripheral portion of the surface speaker
40, all the layers may be adhered by an adhesive layer (double-sided adhesive tape).
[0059]
By doing this, the integrity as a laminate is increased, and a gap is not formed between the layers
or the layers are not shifted. The bonding position by the double-sided adhesive tape (not shown)
can be matched with the supporting position of the bonding layers 68a to 68h, 69a to 69h, 71a
to 71c shown in FIGS. 6 (c), 6 (d) and 7; It is desirable in terms of not lowering the rate. However,
the bonding position may be different depending on the layer. Further, depending on the layer, it
is possible to change the selection of the one-dimensional parallel arrangement arranged in the
longitudinal direction and the one-dimensional parallel arrangement arranged in the lateral
direction orthogonal to this.
[0060]
FIG. 8 is a partial plan view showing flexible electrostatic surface speakers 80A and 80B, which is
another example of the surface speaker 22 in the embodiment shown in FIG. In this specific
example, the surface speaker 60 having the laminated cross-sectional structure shown in FIG. 6 is
one unit, and a plurality of units arranged at intervals are formed as one surface speaker 80A or
80B. is there. That is, the surface speakers 80A and 80B are laminated sheets divided into a
plurality of units and a connecting portion that connects adjacent units among the plurality of
units. In FIG. 8A, a plurality of surface speaker units are one-dimensionally arranged, and in FIG.
04-05-2019
23
8B, a plurality of surface speaker units are two-dimensionally arranged (vertically and
horizontally).
[0061]
In FIG. 8A, the electrostatic type surface speaker units 811 to 815 have the laminated crosssectional structure shown in FIG. 6C or 6D, and become the vibration surface of the surface
speaker 80A. On the other hand, in the region of the connecting portion 82 of the speaker unit,
the conductive layer (the first fixed electrode sheet 62, the vibrating electrode sheet 64, the
second fixed electrode shown in FIG. 6C or 6D) There is no sheet 66), and only the insulating
layer (the third insulating sheet 61, the first insulating sheet 63, the second insulating sheet 65,
the fourth insulating sheet 67) is left, and these are connected. The unit 82 is configured.
[0062]
Further, in the region of the connecting portion 82, the first insulating sheet 63 and the second
insulating sheet 65 may be eliminated. In this case, first, the first fixed electrode sheet 62, the
first insulating sheet 63, the vibrating electrode sheet 64, the second insulating sheet 65, and the
second fixed electrode are provided as the surface speaker units 811 to 815, respectively. A
layered structure of the sheet 66 and the adhesive layers 68a to 68h, 69a to 69h, 71a to 71c is
prepared in advance, and the upper surface and the lower surface of the surface speaker units
811 to 815 are the third insulating sheet 61. By covering the fourth insulating sheet 67, the
surface speaker 80A can be formed. In this case, the third insulating sheet 61 and the fourth
insulating sheet 67 constitute the connecting portion 82. According to such a process, even if the
area of each of the surface speaker units 811 to 815 is small, surface speakers 80A and 80B
having a large area can be obtained.
[0063]
In the connecting portion 82, the layer of the first and second fixed electrode sheets 62 and 66
and the layer of the vibrating electrode sheet 64 do not exist, so even if the connecting portion
82 is bent or folded, the electrode sheet is damaged. Absent. Here, the layers of the insulating
sheet present in the connecting portion 82 are present continuously from the same layer in the
adjacent unit. In other words, these layers are continuous layers common to all units and
junctions. Therefore, in order to provide the connecting portion, it is not necessary to provide a
04-05-2019
24
separate connecting member or to connect the separate connecting member to the adjacent unit
by stitching, bonding or the like.
[0064]
In FIG. 8B, each of the surface speaker units 831 to 834 has a laminated structure similar to that
of the surface speaker units 811 to 815 shown in FIG. 6A, and is a vibration surface of the
surface speaker 80B. In this specific example, in the surface speaker units 831 to 834, the
horizontal direction is connected by the connecting portion 84a, and the vertical direction is
connected by the connecting portion 84b. The layered structure of the connecting portions 84a
and 84b is the same as that of the connecting portion 82 shown in FIG. 8 (a). Furthermore, the
peripheral portion 84c of the electrostatic speaker unit 831 to 834 also has a laminated
structure without a conductive layer, like the connecting portions 84a and 84b, in order to set a
frame (not shown) as an area to be attached.
[0065]
The surface speaker units 811 to 815 in FIG. 8A and the surface speaker units 831 to 834 in FIG.
8B connect lead wires to each electrode of each unit, and these lead wires are independent for
each unit And connect to the drive circuit. Alternatively, in the connecting portions 82, 84a, 84b,
the corresponding electrodes of the adjacent units may be connected by short lead wires, and the
electrodes of each unit may be connected to the drive circuit by a common lead wire.
[0066]
FIG. 9 is a plan view showing a fourth example of the flexible electrostatic surface speaker shown
in FIG. 9 (a) is a plan view showing the back side of the surface speaker 90, and FIG. 9 (b) is a
plan view showing the back side obtained by adding the arrangement of the conductive adhesive
layer in the surface speaker to FIG. 9 (a). 9 (c), (d) and (e) are cross-sectional views looking in the
direction of arrows XX, YY and ZZ in FIG. 9 (b), respectively. In the drawing, the same parts as
those in FIG. The adhesive layers 68a, 69a, 68b, 69b, etc. are extended in the longitudinal
direction as shown in FIG. As shown in FIG. 9A, in the surface speaker 90, two surface speaker
units 90L and 90R are disposed on the left and right for stereo. Because of the left-right
symmetric structure, the left and right configurations are given the same reference numerals and
only the right side surface speaker unit 90R will be described. Since it is a back side view, the
04-05-2019
25
surface speaker unit 90R is illustrated on the left side. The area between the surface speaker
units 90L and 90R is a connecting portion 90C similar to the connecting portion 82 shown in
FIG. 8, and the peripheral portion of the combination of the surface speaker units 90L and 90R is
a region for attaching a frame not shown. Become.
[0067]
91 (b) and (c) in FIG. 9 are band-like first conductive adhesive layers, which are provided
between the first fixed electrode sheet 62 and the third insulating sheet 61. , And extended to the
left half of the upper edge of the flat speaker 90 to bond the two. The conductive adhesive layer
is realized by the conductive pressure-sensitive adhesive itself or a metal foil tape coated with the
conductive pressure-sensitive adhesive. Reference numeral 92 shown in FIGS. 9A, 9B, and 9D is a
first flexible printed circuit board (hereinafter, referred to as a flexible printed circuit board,
hereinafter referred to as an FPC), and a back surface (upper surface in the drawing) of the
insulating film. Conductor foil 92d is attached. It is also possible to use a copper foil tape instead
of this FPC. The FPC 92 (FIG. 9 (d)) is in the same layer as the first conductive adhesive layer 91
(FIG. 9 (c)), and the left edge is longitudinally extended from one end of the upper edge of the
surface speaker unit 90R. It will be set up. The one end 91a of the first conductive adhesive layer
91 and the conductor foil 92d at the one end 92a of the first FPC 92 overlap and adhere to a
part of the upper edge of the surface speaker unit 90R. The other end of the first FPC 92 extends
downward and pierces from the second fixed electrode sheet 62 to the fourth insulating sheet 67
to form a first connection terminal 92 b. 92c is a mounting hole for connecting to the terminal of
the plug.
[0068]
A band-like second conductive adhesive layer 93 shown in FIGS. 9 (b) and 9 (d) is provided
between the first insulating sheet 63 and the vibrating electrode sheet 64, and is a surface
speaker. The left edge (right side of the first FPC 92) of the unit 90R is extended in the
longitudinal direction to reach a part of the lower edge, and both are bonded. Reference numeral
94 denotes a second FPC in which a conductor foil (not shown) is attached to the back surface
(upper surface in the drawing) of the insulating film. The second FPC 94 is provided in the same
layer as the second conductive adhesive layer 93 and at a part of the lower edge of the surface
speaker unit 90R. The one end 93 a of the second conductive adhesive layer 93 and the
conductor foil at the one end 94 a of the second FPC 94 overlap and are bonded at a part of the
lower edge of the surface speaker unit 90 R. The other end of the second FPC 94 pierces from
the vibrating electrode sheet 64 to the fourth insulating sheet 67 to form a second connection
04-05-2019
26
terminal 94 b. The second connection terminal 94 b extends downward at the end, and a
mounting hole 94 c is formed here. Here, for example, the conductor foil of the second FPC 94 is
coated with insulation so as not to short-circuit with the second fixed electrode sheet 66 when
the second FPC 94 pierces these layers.
[0069]
A band-like third conductive adhesive layer 95 is provided between the fourth insulating sheet
65 and the second fixed electrode sheet 66 and extends longitudinally from the right edge of the
surface speaker unit 90R. And reach a part of the lower edge and bond them together. Reference
numeral 96 denotes a third FPC, which is provided in the same layer as the third conductive
adhesive layer 95 and at the lower edge of the surface speaker unit 90R. As shown in FIG. 9E, the
conductor foil 96d at the one end 95a of the third conductive adhesive layer 95 and the one end
96a of the third FPC 96 overlap at a part of the lower edge of the surface speaker unit 90R. Be
glued. The other end of the third FPC 96 pierces through the second fixed electrode sheet 66 and
the fourth insulating sheet 67 to form a third connection terminal 96 b. The third connection
terminal 96 b extends downward at the end, and a mounting hole 96 c is formed here.
[0070]
These first to third conductive adhesive layers 91, 93, 95, and the first to third FPCs 92, 94, 96
are disposed on the periphery of the surface speaker unit 90R so as not to disturb the vibration.
It is done. The first to third connection terminals 92b, 94b, 96b are all arranged at equal
intervals at the lower edge of the surface speaker unit 90R. The engagement protrusions (the
locking portion 21 f and the elastic deformation portion 21 e) and the attachment holes 8 d
shown in FIG. 5 are provided at six places in the lower portion of the frame 21. Each of the first
to third connection terminals 92b, 94b, 96b is a connection terminal 22b inserted into the gap
between the end 51e, 51f of the conductive elastic member 51 and the rectangular piece 51g, as
shown in FIG. It is screwed to the rectangular piece 51 g of the conductive elastic member 51.
The surface speaker 90 shown in FIG. 9 uses the engaging projections (elastically deformable
portions 21 b and the locking portions 21 c) shown in FIG. 3 as the engaging projections on the
upper portion of the frame 21. It is not necessary to use an engagement protrusion which
doubles as the illustrated plug.
[0071]
04-05-2019
27
FIG. 10 is a functional block diagram of the electronic keyboard instrument in the embodiment
shown in FIG. The operation of each white key and black key in the keyboard unit 4 shown in
FIG. 1 is detected by the detection unit 101, and a detection signal is output to the control unit
102. The control unit 102 outputs the performance data to the sound source unit 103. The
performance data includes data such as key depression and key release timing, note number
(pitch) corresponding to key depression or key release, velocity (key depression speed), and after
touch amount. . The control unit 102 described above is realized by causing the CPU to execute a
device built-in program.
[0072]
In the electronic keyboard instrument shown in FIG. 1, operation panels 6a, 6b and 6c are
installed, and a plurality of operating elements (buttons, knobs) 104 are arranged on these.
Examples of the operation element 104 include a switch for setting and operating an instrument
timbre, and a switch for selecting music for automatic performance, and controlling reproduction
start and reproduction stop. The operation of the controls 104 is detected by the detection unit
101 and output to the control unit 102. The control unit 102 sets the function assigned to each
control to the electronic keyboard instrument. In the case of setting for the sound source unit
103, sound source setting data is output to the sound source unit 103.
[0073]
The above-described electronic keyboard instrument has an automatic performance unit 105 and
a music data storage unit 106 built therein. The automatic performance unit 105 reads the music
stored in the music data storage unit 106 by the operation of the operation element, and outputs
performance data of MIDI (Musical Instrument Digital Interface) format to the control unit 102.
The above-mentioned automatic performance unit 105 is also realized by causing the CPU to
execute a device built-in program. The MIDI interface 107 inputs performance data in the MIDI
format supplied from a personal computer or another electronic musical instrument from a
terminal provided on the lower rear panel 3 c and outputs the same to the control unit 102.
[0074]
The sound source unit 103 sets tone generator such as timbre according to the performance data
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input from the control unit 102, and generates tone signals of stereo (two channels of L and R) of
pitch and strength according to the key depression operation. It generates and outputs to the
amplifiers 108L, 108R, 110L, 111L, and 111R. The illustrated tone source unit 103 uses a left
source and a right source for stereo to generate one musical tone. These sound source sources
are stored in a sound source waveform memory (not shown). Further, the sound source unit 103
may use a monaural source, and may control the right and left volume ratio (sound image
localization control) in accordance with the band of the operated key or the like.
[0075]
The outputs of the amplifiers 108L and 108R are output to the headphone external output
terminals 109L and 109R, respectively. The output of the amplifier 110L is output to the cone
speaker 10 shown in FIG. When the cone speaker 10 in the left side area shown in FIG. 1 is also
arranged in the right side area of the upper front portion 5, the output of the R channel of the
sound source unit 103 is processed through the amplifier (110R) not shown. Output to the cone
speaker arranged in The outputs of the amplifiers 111L and 111R are output to the primary coils
of the step-up transformers 112L and 112R, respectively. To the secondary coils of the step-up
transformers 112L and 112R, a surface speaker 22 having flexibility to configure the surface
speaker panel 9 shown in FIG. 1 is connected. In the illustrated example, the surface speaker 90
divided into the surface speaker unit 90L for the left channel and the surface speaker unit 90R
for the right channel shown in FIG. 9 is used as the surface speaker 22. The secondary coil of the
step-up transformer 112L has a middle point tap CT, and a series circuit of a high voltage bias
DC power supply 113L and a high resistance resistor 114L is connected to the middle point tap
CT. Both ends of the secondary coil described above are terminals 115L and 116L, and the other
end of the resistor 114L is a terminal 117L.
[0076]
As the terminals 115L, 116L, and 117L, connectors (conductive elastic members 51, electrical
connection) are used for the mechanical connection structures (the locking portions 21f, the
elastic deformation portions 21e, and the mounting holes 8d) described with reference to FIG.
The same material as the conductive member 53) is used. The terminal 115L is connected to the
first fixed electrode sheet 62 shown in FIG. 6 via the first conductive thin plate 92 and the
conductive adhesive layer 91. Similarly, the terminal 116L is connected to the second fixed
electrode sheet 66, and the terminal 116L is connected to the vibrating electrode sheet 64.
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[0077]
As described above, when six connectors (plugs and sockets) which are independent and
separated from each other are used for each one of the terminals 115L to 117L (one circuit), the
connection between the plug and the socket can be performed. It is less likely that the operator's
finger will touch multiple circuits of the output line at the same time. Of course, it is always the
case that a high voltage is applied to the output line only when the surface speaker panel is
attached to the support. However, even if a high voltage is output between the output lines at the
time of connection work, it is possible to prevent an electric shock of the connection worker.
[0078]
The terminals 115L, 116L, and 117L of the surface speaker unit 90L may be a common
connector (plug, socket) having three terminals (three circuits). In addition, one common
connector having six terminals (six circuits) common to the surface speaker units 90L and 90R
may be used, including the terminals 115R, 116R, and 117R.
[0079]
Here, the operation principle of the electrostatic type surface speaker will be described with the
vibrating electrode sheet 64 as a reference of the potential. The first fixed electrode sheet 62 and
the second fixed electrode sheet 66 are negatively charged by E0 = several hundreds of [V] by
the bias DC power supply 113L, and the vibrating electrode sheet 64 and the first fixed electrode
sheet 62 are electrically charged. Between the vibrating electrode sheet 64 and the second fixed
electrode sheet 66, electrostatic attraction forces in opposite directions are generated. In this
state, when the tone signal ± e [V] (e is a value sufficiently smaller than E0) of opposite phase is
applied to the first fixed electrode sheet 62 and the first fixed electrode sheet 66, the first The
fixed electrode sheet 62 and the second fixed electrode sheet 66 are negatively charged at (E0 +
e) [V] and (E0-e) [V], respectively. As a result, the balance of electrostatic attraction between the
electrodes of the vibrating electrode sheet 64 and the first fixed electrode sheet 62 and between
the vibrating electrode sheet 64 and the second fixed electrode sheet 66 is broken, as a result,
Electrostatic attraction is generated in proportion to the tone signal e [V], and the vibrating
electrode sheet 64 is push-pull driven according to the positive / negative of the tone signal e [V].
In the above description, the surface speaker unit 90L has been described, but the same is true
for the surface speaker unit 90R, and the description will be omitted.
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[0080]
In the above description, the output of the amplifier 110L is directly output to the cone speaker
10. However, in order to supply a musical tone signal according to the frequency characteristic
of the cone speaker 10, it is desirable to insert a low pass filter circuit on the input side or the
output side of the amplifier 110L. Similarly, even if a high frequency or middle high frequency
pass filter circuit for supplying a tone signal according to the frequency characteristic of the
surface speaker unit 90L to the step-up transformer 112L is inserted on the input side or the
output side of the amplifier 111L. Good. The characteristics of the filter circuit described above
are designed so that the sound output from the cone speaker 10 and the sound output from the
surface speaker unit 90L are balanced on the frequency characteristics.
[0081]
Furthermore, a tweeter speaker (for example, a dome type dynamic speaker) for high frequency
range reproduction may be provided, and the amplifier 110L may distribute the musical tone
signal to the tweeter speaker. A switch may be provided for selectively switching between the
surface speaker unit 90L and the tweeter speaker and using either one. Although not shown, the
sound source unit 103 may be provided with dedicated sources (two systems of L and R) for the
surface speaker units 90L and 90R. In this case, the tone signal based on the dedicated source is
amplified by the amplifiers 111L and 111R and supplied to the step-up transformers 112L and
112R. When the surface speaker 90 described above is not divided into the left and right
channels, the monaural signal is supplied from the sound source unit 103, amplified, and output
to the step-up transformer. Alternatively, a mixing unit for mixing the stereo output of the sound
source unit 103 is provided, and the output of the mixing unit is amplified and output to the
step-up transformer.
[0082]
DESCRIPTION OF SYMBOLS 1 ... Side plate, 2 ... Top plate, 2a ... Linear hole, 2b ... Rear inclination
plate, 2c ... Linear plate, 3 ... Bottom plate, 3a ... Substrate, 3b ... Front inclination bottom plate, 3c
... Lower back plate, 3d ... Lower front plate, 3e: back upper bottom plate, 4: keyboard portion, 4a:
keyboard frame, 4b: vertical rib, 4c: white key, 4d black key, 4e, 4f: time plate, 5: upper front
portion, 6a, 6b, 6c: operation panel, 7: display, 8: upper front plate, 8a: through hole, 8b: lattice
portion, 8c, 8d: mounting hole, 8e: step portion, 9: surface speaker panel, 10: cone speaker, 10a
... Front opening 11 Frame plate 12 Holding member 12a Mounting portion 12b Screw hole 12c
Mounting portion 12d Mounting hole 13 Electronic circuit block 14 Internal space 21 Frame
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body 21a: opening portion, 21b: elastic deformation portion, 21c: locking portion, 21d: mounting
hole, 21e: bullet Deformed portion, 21f: locking portion, 21g: mounting hole, 21h: inclined
surface, 21i: through hole, 21j: groove, 21k: shallow groove, 21L: inclined surface, 21m: through
hole, 21n: groove, 21o: opening Portions 21p: longitudinal grooves 22, 22L, 22R: surface
speakers, 22a, 22b: connection terminals, 22c: mounting holes, 22d: engaging holes, 23:
punching panel plate, 23a: upper end, 23b: screw holes, 23c lower end portion 23d mounting
portion 23e screw hole 24 flathead driver 25 screw member 31, 32 anti-vibration member 33
screw member 41 conductive elastic member 41a, 41c, 41e ... peak part, 41b, 41d ... valley part,
42 ... conductive member, 43 ... screw member, 51 ... conductive elastic member, 51a, 51c ...
valley part, 51b, 51d ... peak part, 51e, 51f ... end part, 51 g ... rectangular piece, 51 h ...
Reference numeral 51i: engaging protrusion 52: screw member 53: conductive member 54:
screw member 60: surface speaker 61: third insulating sheet 62: first fixed electrode sheet 62a:
62a Through hole, 63: first insulating sheet, 64: vibrating electrode sheet, 65: second insulating
sheet, 66: second fixed electrode sheet, 66a: through hole, 67: fourth insulating sheet, 68a to
68h, 69a to 69h: adhesive layer, 70: surface speaker, 71a, 71b, 71c: adhesive layer, 80A, 80B:
surface speaker, 811 to 815: surface speaker unit, 82: connection portion, 831 to 834: surface
Speaker unit, 84a, 84b ... connection portion, 84c ... peripheral portion, 90 ... surface speaker,
90L, 90R ... surface speaker unit (electrostatic type surface speaker) 90C ... connection portion,
91, 93, 95 ... 1st to 4th Lead of 3 Electrically conductive adhesive layer 91a, 93a, 95a ... one end,
92, 94, 96 ... first to third FPCs (flexible printed circuit boards) 92a, 94a, 96a ... one end, 92b,
94b, 96b ... connection terminal , 92c, 94c, 96c ... mounting holes, 92d, 96d ... conductor foils,
101 ... detection units, 102 ... control units, 103 ... sound source units, 104 ... operators, 105 ...
automatic playing units, 106 ... song data storage units, 107: MIDI interface 108L, 108R, 110L
amplifier, 109L, 109R: external output terminal 110L, 111L, 111R: amplifier, 112L, 112R: boost
transformer, 113L, 113R: bias DC power supply, 114L, 114R ... resistor, 115L, 115R, 116L,
116R, 117L, 117R ... terminals
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