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JP2012100233

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DESCRIPTION JP2012100233
An object of the present invention is to provide a thin double-sided speaker capable of inclining
both high-band sounds output from both sides in a desired direction. SOLUTION: A large number
of linear patterns 12 corresponding to a neutral zone of a permanent magnet plate are formed on
a diaphragm disposed between two permanent magnet plates, and two sound emitting surfaces
emitting sound in opposite directions to each other Is a thin double-sided speaker. The
diaphragm is divided into two or more vibration areas 15a and 15b, and wiring patterns 11a and
11b are formed by connecting the linear patterns 12 for each of the vibration areas 15a and 15b.
Therefore, if drive signals with different delay times are supplied to the wiring patterns 11a and
11b, the directivity directions of the two sound emitting surfaces can be inclined in the same
direction with respect to the front direction. [Selected figure] Figure 4
Thin double sided speaker
[0001]
The present invention relates to a thin double-sided speaker, and more particularly, to an
improvement of the thin double-sided speaker capable of emitting sound from both sides of a flat
thin casing.
[0002]
A diaphragm is disposed in a gap (a gap) between two permanent magnet plates, and a drive
current is supplied to a wiring pattern formed on the diaphragm to vibrate the diaphragm in the
gap, whereby the permanent magnet plate is produced. There is known a thin double-sided
speaker capable of emitting sound from both sides through the sound emission holes
respectively formed in (see, for example, Patent Document 1).
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1
[0003]
This type of thin double-sided speaker has two sound emitting surfaces directed in opposite
directions, and can emit sound waves in antiphase with each other.
In addition, from each sound emission surface, a plane wave with high straightness is emitted,
and the directivity of the sound emission surface in the front direction is high.
For this reason, it is thought that it is suitable for the use for which securing a fixed sound
pressure is calculated ¦ required in a long and thin area, for example, the speaker for station yard
broadcasts installed in the platform of a station.
[0004]
FIG. 15 is a view showing an installation example of a conventional thin double-sided speaker
200. As shown in FIG. In the figure, the front of the sound emission surface to match the
longitudinal direction of the platform, thin double-sided speaker 200 is installed on the ceiling of
the platform. Thin sided speaker 200, since the two sound emitting surfaces are facing away
from each other, it is possible to form a sound field in both directions on the platform across the
thin double-sided speaker 200. Further, due to the straightness of the plane wave, a constant
sound pressure can be secured even at a relatively distant position on the platform. On the other
hand, there is a problem that it is difficult to hear the sound in the vicinity of the obliquely lower
side of the thin double-sided speaker, and in particular, the high sound has higher directivity
than the low sound, and the high sound is difficult to hear.
[0005]
In such a case, in the case of a general speaker that is not a double-sided type, by setting the
sound emission surface downward with respect to the horizontal direction, the sound pressure
and sound quality in the distance, the sound pressure in the obliquely downward direction, The
sound quality can be balanced. However, in the case of a thin double-sided speaker, the merits of
the thin double-sided speaker 200 that a sound field can be formed on both sides since one of
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the sound emitting faces faces downward when the other sound emitting face faces upward
There is a problem that you can not make the most of
[0006]
JP-A-9-331596
[0007]
The present invention has been made in view of the above circumstances, the high band sound of
the band of the sound output from both sides of the thin double-sided speaker, both capable of
controlling so as to be received in a desired direction thin It aims at providing a double-sided
speaker.
[0008]
Thin sided speaker according to a first aspect of the present invention is formed multipolar
magnetized pattern strip N and S poles to be parallel to each other appear alternately, a large
number of sound output holes in the neutral zone between the different poles is formed and the
two permanent magnet plates are placed between two of said permanent magnet plates that are
opposed to the pole, and a plurality of diaphragm linear pattern is formed corresponding to the
neutral zone, the diaphragm but is divided into two or more vibration areas, each consisting of 2
or more straight lines pattern adjacent, the straight line pattern is connected to each said
vibration area the same drive signal having different delay time is 2 or more can be supplied The
wiring pattern of is formed.
[0009]
In the neutral zone, the magnetic field perpendicular to the permanent magnet plate is weak, and
the magnetic field parallel to the permanent magnet plate is strong.
For this reason, if a diaphragm is disposed between two permanent magnet plates and a large
number of linear patterns corresponding to the neutral zone are formed on the diaphragm, the
thickness of the diaphragm can be obtained by supplying a drive signal to the linear pattern. It
vibrates in a direction, and the vibration noise can be emitted from the sound emission hole of
the permanent magnet plate.
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[0010]
In such a thin double-sided speaker, the diaphragm is divided into two or more vibration areas
adjacent to each other, a wiring pattern in which a linear pattern is connected is formed for each
vibration area, and delay times are made different for each wiring pattern. If the same drive
signal is supplied, by adjusting the delay time, it is possible to control so that the sound in the
high band among the bands of the sound output from both sides can be delivered in the desired
direction.
[0011]
In the thin double-sided speaker according to the second aspect of the present invention, in
addition to the above configuration, the vibration area is rectangular, and is configured such that
each side is opposed and adjacent to each other.
[0012]
With such a configuration, it is possible to make the vibration areas to which the same drive
signal having different delay times are respectively supplied close to each other, and directivity
control in a high band can be realized.
[0013]
In the thin double-sided speaker according to the third aspect of the present invention, in
addition to the above configuration, a gap regulating member which penetrates the diaphragm
and regulates a gap between the permanent magnet plates is disposed in the vibration area or
between the vibration areas It is done.
[0014]
With such a configuration, the distance between the permanent magnet plates can be made
uniform, and the speaker characteristics can be improved.
In particular, even if the area of the permanent magnet plate increases in order to divide the
diaphragm into two or more vibration areas, the permanent magnet plate is bent due to the
displacement of the magnets, and the distance between the permanent magnets becomes uneven.
Can be prevented.
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[0015]
In the thin double-sided speaker according to the fourth aspect of the present invention, in
addition to the above configuration, the straight line pattern has a bypass pattern that bypasses
the gap regulating member.
With this configuration, even for a region may interfere with the through hole of the diaphragm
by arranging a linear pattern, it is possible to arrange the linear pattern, the vibration plate on
the same area, a larger vibration area It can be secured.
[0016]
Thin sided speaker according to a fifth invention, in addition to the above structure, the
permanent magnet plate has a through hole facing the detour pattern.
With such a configuration, it is possible to suppress the electromagnetic force to be oscillated in
the antiphase direction or the in-plane direction generated by the interaction between the
permanent magnet plate and the bypass pattern, and to prevent the deterioration of the speaker
characteristics.
[0017]
According to the present invention, it is possible to provide a small, thin double-sided speaker
capable of controlling the pointing direction.
In particular, it is possible to provide a small thin double-sided speaker in which the directions of
the two sound emitting faces can be inclined in the same direction.
[0018]
FIG. 1 is an external view of a thin double-sided speaker 100 according to Embodiment 1 of the
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present invention.
FIG. 2 is an exploded perspective view of the thin double-sided speaker 100 of FIG. 1;
It is sectional drawing by the AA cutting line of the thin-sided double-sided speaker 100 of FIG. It
is a top view of the diaphragm 1 of FIG. It is a top view of the permanent magnet board 2 of FIG.
It is the figure which showed an example of the loud-speaking system using the thin double-sided
speaker 100 of FIG. FIG. 6 is an explanatory view schematically showing directivity
characteristics of the thin double-sided speaker 100. It is the figure which showed the frequency
characteristic of the sound pressure level of the front direction (0 degree direction) about the
directivity of the loud-sound system of FIG. It is the figure which showed the frequency
characteristic of the sound pressure level of the direction (5 degree direction) of 5 degrees
downward about the directivity of the loud-sound system of FIG. It is the figure which showed the
frequency characteristic of the sound pressure level of the direction (10 degree direction) of 10
degree downward direction about the directional characteristic of the loud sound system of FIG.
It is the figure which showed the frequency characteristic of the sound pressure level of the
direction (15 direction of 15 degrees) downward 15 direction about the directivity of the loudsound system of FIG. It is the top view which showed one structural example of the diaphragm 1
about the thin double-sided speaker 100 by Embodiment 2 of this invention. It is the top view
which showed one structural example of the diaphragm 1 about the thin double-sided speaker
100 by form 3 of this invention. It is the top view which showed one structural example of the
diaphragm 1 about the thin double-sided speaker 100 by form 4 of this invention. It is the figure
which showed the example of installation of the conventional thin double-sided speaker 200. As
shown in FIG.
[0019]
Embodiment 1 1 to 3 are diagrams showing one configuration example of a thin double-sided
speaker 100 according to a first embodiment of the present invention, FIG. 1 is an external view
of the thin double-sided speaker 100, and FIG. FIG. 3 is a cross-sectional view taken along the
line A-A of FIG. 1. The thin double-sided speaker 100, a thin rectangular plate shape sandwiched
between two housing panel 3, the two housings panel 3, it is possible to sound the plane wave
respectively. That is, the housing panel 3 is a sound emitting surface, and the two sound emitting
surfaces emit sound in opposite directions to each other.
[0020]
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The thin double-sided speaker 100 includes one diaphragm 1, two permanent magnet plates 2,
two housing panels 3, two housing frames 4, two buffer sheets bs, and two filters ft. ing. The two
permanent magnet plates 2 are arranged opposite to each other so as to sandwich the diaphragm
1, and by supplying a drive signal to the wiring pattern 11 of the diaphragm 1, the diaphragm in
the gap between the permanent magnet plates 2 1 can be vibrated in the thickness direction.
Further, the two housing panels 3 are disposed to face each other so as to sandwich the two
permanent magnet plates 2, and the housing frame 4 is disposed to cover the end face of the
permanent magnet plate 2. Furthermore, two buffer sheets bs are respectively disposed between
the diaphragm 1 and the permanent magnet plate 2, and two filters ft are respectively disposed
between the permanent magnet plate 2 and the housing panel 3.
[0021]
Diaphragm 1 is a flexible film wiring pattern 11 is formed, for example, a wiring pattern 11 made
of copper is formed on a resin film made of polyimide. The wiring pattern 11 is a meandering
pattern in which a large number of straight line patterns 12 parallel to one another are
connected, and is connected to a feeding terminal 1t provided upright at a corner portion of the
diaphragm 1. The feed terminal 1 t is connected to the external terminal et through the terminal
hole 4 t of the housing frame 4 and the terminal hole 3 t of the housing panel 3. Therefore, the
drive signal can be supplied from the external terminal et to the wiring pattern 11 through the
feed terminal 1t. The wiring patterns 11 are formed on both sides of the diaphragm 1, and the
linear patterns 12 are formed at the same position at the same position so as to overlap the
diaphragm 1.
[0022]
The permanent magnet plate 2 is a plate-like permanent magnet, and a multipolar magnetization
pattern is formed on the inner main surface facing the diaphragm 1. This multipolar
magnetization pattern is a pattern in which a large number of N poles and S poles are arranged
parallel to one another so that strip-like N poles and S poles appear alternately. A band-like
neutral zone in which the magnetic field perpendicular to the permanent magnet plate 2 is
minimum is formed between the adjacent N and S poles. A large number of sound emission holes
2h penetrating the permanent magnet plate 2 are formed on the neutral zone.
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[0023]
The two permanent magnet plates 2 are disposed so as to sandwich the linear pattern 12 of the
diaphragm 1 between the opposing neutral zones in a state in which the same poles face each
other. Generally, the magnetic field parallel to the permanent magnet plate 2 is maximum in the
neutral zone, but the magnetic flux density in the magnetic field can be further increased by
making the same poles of the permanent magnet plate 2 face each other. By arranging the linear
patterns 12 of the diaphragm 1 at a position corresponding to such a neutral zone, it is possible
to most efficiently generate an electromagnetic force for vibrating the vibration plate 1 in the
thickness direction.
[0024]
The housing panel 3 and the housing frame 4 constitute a housing for housing the permanent
magnet plate 2. In the diaphragm 1, the peripheral portion thereof is sandwiched between the
two casing frames 4, and these casing frames 4 are sandwiched between the two casing panels 3
so that the diaphragm 1 can be made of the thin double-sided speaker 100. It is supported at the
center in the thickness direction. In addition, the plate-shaped housing panel 3 covers the outer
main surface of the permanent magnet plate 2 and the frame-shaped housing frame 4 covers the
side surface of the permanent magnet plate 2 so that the magnetic flux from the permanent
magnet plate 2 It prevents leakage. Further, the housing panel 3 is provided with a large number
of sound emission holes 3 h penetrating the housing panel 3. These sound emission holes 3 h are
formed at positions corresponding to the sound emission holes 2 h of the permanent magnet
plate 2, and the sound generated by the vibration of the diaphragm 1 is generated by the sound
emission holes 2 h of the permanent magnet and the housing panel 3. The sound is emitted from
the housing panel 3 to the free space through the sound release holes 3h.
[0025]
The cushioning sheet bs is a cushioning material for preventing the generation of noise due to
the collision between the diaphragm 1 and the permanent magnet plate 2, and a material having
good air permeability such as a non-woven fabric is used. The thickness of the buffer sheet bs is
smaller than the distance between the diaphragm 1 and the permanent magnet plate 2, and a
space in which the diaphragm 1 can vibrate is formed between the diaphragm 1 and the buffer
sheet bs. The filter ft is a dustproof material for preventing the ingress of dust from the outside,
and is made of a material having high air permeability.
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[0026]
The three sets of bolts 20, spacers 21 and nuts 22 are fastening means for fastening the two
housing panels 3 to each other and restricting the distance therebetween, and are provided
inside the peripheral edge on the housing panels 3 There is. The spacer 21 is a cylindrical body
which penetrates the diaphragm 1 and the permanent magnet plate 2 through the fastening
holes 1 j and 2 j and has both ends in contact with the inner main surface of the housing panel 3.
After passing through the inside of the spacer 21 and traversing the two housing panels 3, they
are screwed with the nut 22. That is, when the fastening means regulates the distance between
the housing panels 3, the gap width of the permanent magnet plate 2 sandwiched by the housing
panels 3 can also be regulated. That is, the fastening means functions as a gap control means of
the permanent magnet plate 2.
[0027]
When the same poles of the permanent magnet plate 2 are opposed to each other, a repulsive
force acts between the permanent magnet plates 2. Therefore, when only the peripheral portion
of the permanent magnet plate 2 is supported, the permanent magnet plate 2 is bent by the
exhaust force, the gap near the center of the main surface is larger than the peripheral portion,
and the speaker characteristics are degraded. Therefore, if the gap width of the permanent
magnet plate 2 is regulated in the vicinity of the center of the main surface of the housing panel
3 and the gap between the permanent magnet plates 2 is made uniform, the speaker
characteristics are improved and the quality of each product is improved. Variation can be
suppressed.
[0028]
Here, an example in which the gap width between the permanent magnet plates 2 is restricted by
the fastening means for fastening the two housing panels 3 to each other has been described. For
example, a spacer is disposed between the permanent magnet plates 2 It goes without saying
that the gap width may be regulated by fastening the plates 2 to each other. Moreover, although
it is desirable to carry out the gap regulation of the permanent magnet plate 2 in the vicinity of
the center of the main surface, when two or more gap regulation means are provided, they may
be disposed at symmetrical positions with respect to the center of the main surface .
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[0029]
FIG. 4 is a view showing a detailed configuration example of the thin double-sided speaker 100 of
FIG. 1, and a plan view of the diaphragm 1 is shown. The diaphragm 1 is divided into two
vibration areas 15a and 15b, and two wiring patterns 11a and 11b independent of each other
are formed in correspondence with the vibration areas 15a and 15b. A large number of linear
patterns 12 formed parallel to each other on the diaphragm 1 are divided into two groups so that
each group is constituted by the linear patterns 12 adjacent to each other, and the vibration
areas 15a and 15b are formed. Is defined as an arrangement area of the linear patterns 12
belonging to each group. That is, each of the vibration areas 15a and 15b is an area obtained by
dividing the diaphragm 1 by a straight line parallel to the straight line pattern 12, and one side of
each area is opposed to become a rectangular area adjacent to each other.
[0030]
The wiring pattern 11a is formed as a serpentine pattern in which two or more linear patterns 12
formed in the vibration area 15a are connected. Similarly, the wiring pattern 11b is formed as a
serpentine pattern in which two or more linear patterns 12 formed in the vibration area 15b are
connected. The wiring patterns 11a and 11b are connected to different feed terminals 1t, and by
supplying different drive signals to the feed terminals 1t, the vibration areas 15a and 15b are
oscillated independently of each other. be able to. In the figure, since all three fastening holes 1j
are formed between the vibration areas 15a and 15b and restrict the gap of the permanent
magnet plate 2 also at positions other than the peripheral portion of the diaphragm 1, the
permanent magnet plate The gap of 2 can be made uniform.
[0031]
Here, when the fastening holes 1j are provided between the vibrating areas 15a and 15b, a nonvibrating area having a width larger than the diameter of the fastening holes 1j is formed
between the vibrating areas 15a and 15b, and the areas of the respective vibrating areas 15a and
15b The problem of narrowing the Therefore, the non-vibration area is minimized by using a
detour straight pattern 12m having a detour pattern 12n detouring the fastening hole 1j.
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[0032]
The bypass straight line pattern 12m is a pattern in which a portion interfering with the
fastening hole 1j in the straight line pattern 12 is replaced with the bypass pattern 12n having a
non-linear shape, and the straight line pattern divided into two or more by the fastening hole 1j
is a bypass pattern It is the pattern which intervened 12n and was connected. Furthermore, also
for a straight line pattern 12 having a portion that interferes with the adjacent detour straight
line pattern 12m, in the same manner, the portion can be replaced with the detour pattern 12n
to form a bypass straight line pattern 12m. That is, by arranging the detour straight line pattern
12m in the one vibration area 15a (15b) and near the boundary with the other vibration area
15b (15a), the non-vibration area is narrowed, and the vibration areas 15a and 15b. You can
expand the area of
[0033]
FIG. 5 is a view showing a detailed configuration example of the thin double-sided speaker 100 of
FIG. 1, and a plan view of the permanent magnet plate 2 is shown. What is indicated by a broken
line in the drawing is the position on the permanent magnet plate 2 corresponding to the wiring
pattern 11 on the diaphragm 1 and the fastening hole 1 j.
[0034]
The sound release holes 2 h are formed on a plurality of strip-like neutral zones formed in
parallel with one another. The permanent magnet plate 2 has a large number of N and S poles
alternately arranged at equal intervals on its main surface, so that many neutral zones formed in
the middle between different poles are also in the form of strips, respectively. It is formed to be
equally spaced and parallel. Therefore, although it is easy to associate the pattern of the neutral
zone of the permanent magnet plate 2 with the linear pattern 12 of the diaphragm 1, it can not
be associated with the bypass pattern 12n. Moreover, it is difficult to form an irregular neutral
zone pattern that can be associated with the bypass pattern 12 n.
[0035]
However, when the bypass pattern 12 n faces the region of the N pole or the S pole other than
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the neutral zone, an electromagnetic force is generated to vibrate the diaphragm 1 in the
antiphase direction or the in-plane direction to deteriorate the speaker characteristics. It will For
this reason, the detour pattern 12n is formed by expanding the fastening holes 2j so that the
fastening holes 2j of the permanent magnet plate 2 face not only the fastening holes 1j of the
diaphragm 1 but also the bypass patterns 12n of the diaphragm 1 And preventing the permanent
magnet plate 2 from facing other than the neutral zone.
[0036]
FIG. 6 is a diagram showing an example of a loudspeaker system using the thin double-sided
speaker 100 of FIG. In this loudspeaker system, the pointing direction can be inclined with
respect to the front direction by supplying the delayed drive signal to one of the vibration areas
15a and 15b.
[0037]
The thin double-sided speaker 100 is attached to a ceiling, and is suspended from the ceiling so
that the front direction of the housing panel 3 is horizontal. For example, as a yard broadcasting
facility of a station, the front direction of each housing panel 3 is matched with the longitudinal
direction of the platform and attached to the ceiling of the platform. The diaphragm 1 is divided
into an upper vibration area 15a and a lower vibration area 15b, and two wiring patterns 11a
and 11b corresponding to these vibration areas 15a and 15b are formed, and the lower wiring
pattern is formed. By supplying a drive signal delayed from the upper wiring pattern 11a to 11b,
the pointing direction is directed lower than the horizontal direction.
[0038]
The drive signal output from the sound source device 50 is supplied to the delay circuit 51 and
the upper wiring pattern 11a, while the drive signal delayed by the delay circuit 51 is supplied to
the lower wiring pattern 11b. The delay circuit 51 is a circuit that delays the drive signal by a
fixed time for at least the voice band. For example, in the low pass filter circuit composed of LC
elements, the amplitude is substantially constant in the pass band, and the phase delay angle
increases in proportion to the frequency. Therefore, by using such a low pass filter circuit, it is
possible to realize a delay circuit in which the delay time is constant for each frequency band in
the voice band.
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[0039]
The delay distance D in the figure indicates the distance traveled by the sound wave during the
delay time in the delay circuit 51, and the sound wave from the upper vibration area 15a (wiring
pattern 11a) and the lower vibration area 15b (wiring pattern) The wave front where the phase
of the sound wave from 11b) is aligned is inclined downward from the horizontal direction.
Therefore, the pointing direction can be directed lower than the front direction. Moreover, since
the direction of orientation of the two housing panels 3 can be simultaneously inclined
downward, the directions of the directions of the two sound emitting surfaces are both directed
downward, and the sound pressure at a distance on each side of the thin double-sided speaker
100 And sound quality, and sound pressure and sound quality in the diagonally lower direction
of the speaker can be balanced.
[0040]
FIG. 7 is an explanatory view schematically showing the directivity characteristic of the thin
double-sided speaker 100. As shown in FIG. Each of 53H and 53L in the figure is a directivity
characteristic at a frequency in the voice band, and the directivity characteristic 53H relates to a
frequency higher than the directivity characteristic 53L. As shown in FIG. 7, in the thin doublesided speaker 100, the directivity becomes higher as the frequency becomes higher. For this
reason, when the thin double-sided speaker 100 is attached to the ceiling, low tones can be heard
near the diagonally lower portion, but high tones are difficult to hear. However, by tilting the
pointing direction downward using the loudspeaker system of FIG. 6, it is possible to make both
low and high tones easily audible even in the vicinity of the obliquely lower side of the thin
double-sided speaker 100.
[0041]
FIGS. 8 to 11 are diagrams showing measurement results of directivity characteristics of the
loudspeaker system of FIG. 6, and measurement results in three directions regarding sound
pressure levels at positions separated by a fixed distance from the thin double-sided speaker 100
It is shown. 8 shows the front direction (0 ° direction) of the housing panel 3, FIG. 9 shows the
direction 5 ° lower than the front direction (−5 ° direction), and FIG. 10 shows the direction
10 ° lower than the front direction. FIG. 11 shows frequency characteristics of the sound
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pressure level in the direction (−15 ° direction) that is 15 ° downward from the front
direction (−10 ° direction). Further, a solid line 55 in the figure is a frequency characteristic
when the drive signal of the lower wiring pattern 11b is delayed, and a broken line 56 is a
frequency characteristic when not delayed.
[0042]
According to the measurement results, in the low directivity band of 5 kHz or less, there is almost
a difference in the sound pressure level even if any direction is compared or the characteristics
55 and 56 in the same direction are compared. Absent. However, focusing on a band higher than
5 kHz, it can be seen that the magnitude relationship between the sound pressure levels of the
characteristics 55 and 56 is reversed depending on the direction. That is, in the 0 degree
direction, the sound pressure level of the non-delayed characteristic 56 is larger, but in the −5
° direction, the sound pressure levels of the characteristics 55 and 56 become almost equal, and
in the −10 ° direction, the delayed characteristic The sound pressure level of 55 is higher. Also,
in the -15 ° direction, a dip (drop) in the vicinity of 7 kHz generated in the characteristic 56 not
delayed is not generated in the characteristic 55 delayed, and it is easy to hear a sound in the
vicinity of 7 kHz Recognize. That is, by delaying the drive signal to the wiring pattern 11b as
compared to the drive signal to the wiring pattern 11a, the directivity direction can be directed
downward for the frequency band of 5 to 15 kHz, and listening in the diagonally downward
direction It turns out that it is easy.
[0043]
In the thin double-sided speaker 100 according to the present embodiment, the diaphragm 1 is
disposed between two permanent magnet plates 2, and a large number of linear patterns 12
corresponding to the neutral zone are formed on the diaphragm 1. For this reason, by supplying
a drive signal to the linear pattern 12, the diaphragm 1 can be vibrated in the thickness direction,
and the vibration noise can be emitted from the sound emission hole 2 h of the permanent
magnet plate 2.
[0044]
In such a thin double-sided speaker 100, the diaphragm 1 is divided into two or more vibration
areas 15a and 15b, and wiring patterns 11a and 11b are formed by connecting the linear
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patterns 12 for each of the vibration areas 15a and 15b. Therefore, if different drive signals are
supplied to the wiring patterns 11a and 11b, different sounds can be generated for each
vibration area. Therefore, the same diaphragm 1 can be vibrated for every two or more vibration
areas 15a and 15b, and it can be used as two or more speakers. In addition, since one diaphragm
is divided into two or more vibration areas and used, the size of the apparatus can be
significantly reduced as compared with the conventional speaker array apparatus having two or
more speakers.
[0045]
The thin double-sided speaker 100 according to the present embodiment includes two or more
feed terminals 1t corresponding to the vibration areas 15a and 15b, and the wiring patterns 11a
and 11b are connected to different feed terminals 1t. For this reason, if drive signals with
different delay times are supplied to the respective feed terminals 1t, the pointing direction of
the thin double-sided speaker can be controlled. Therefore, the pointing direction of the thin
double-sided speaker can be inclined with respect to the front direction of the sound emitting
surface. Moreover, the pointing directions of the two sound emitting planes can be
simultaneously inclined in the same direction. Furthermore, by adjusting the delay time, it is also
possible to adjust the angle between the front direction and the pointing direction. That is, it can
be used similarly to the conventional speaker array device.
[0046]
Further, in the thin double-sided speaker 100 according to the present embodiment, since the
fastening means of the housing panel 3 consisting of the bolt 20, the spacer 21 and the nut 22
regulates the gap width between the permanent magnet plates 2, the permanent magnet plate 2
prevents the gap in the central portion from becoming wider than the peripheral portion. For this
reason, the gaps between the permanent magnet plates 2 can be made uniform, the speaker
characteristics can be improved, and variations in quality among products can be suppressed.
[0047]
Further, in the present embodiment, an example in which the directivity direction is inclined by
supplying the same drive signal having different delay times to two or more wiring patterns 11a
and 11b has been described. It is also possible to respectively supply drive signals supplied from
different sound source devices to 11a and 11b, and to output different sounds for each of the
vibration areas 15a and 15b.
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[0048]
Second Embodiment
In the first embodiment, an example in which the diaphragm 1 is divided into two vibration areas
15a and 15b and the two wiring patterns 11a and 11b independent of each other are formed in
association with the vibration areas 15a and 15b. explained. On the other hand, in the present
embodiment, the diaphragm 1 'is divided into three vibration areas 15a to 15c, and the three
wiring patterns 11a to 11c independent of each other are formed in correspondence with these
vibration areas 15a to 15c. The case will be described.
[0049]
FIG. 12 is a view showing an example of the configuration of the main part of a thin double-sided
speaker 100 according to Embodiment 2 of the present invention, in which an example of the
configuration of the diaphragm 1 ′ is shown. The diaphragm 1 'is divided into three vibration
areas 15a to 15c. Each of the vibration areas 15a to 15c includes two or more linear patterns 12
respectively. The wiring patterns 11a to 11c are serpentine patterns in which the linear patterns
12 in the corresponding vibration areas 15a to 15c are connected, and are connected to different
feed terminals 1t. The other configuration is the same as that of the first embodiment, and thus
the description will not be repeated.
[0050]
According to the present embodiment, the diaphragm 1 ′ can be divided into three or more
vibration areas 15a to 15c, and each vibration area 15a to 15c can be independently driven by
different drive signals. For this reason, compared with the compound speaker provided with
three speakers which each has an independent diaphragm, a small compound speaker can be
implement ¦ achieved. Further, by dividing the diaphragm 1 'into three vibration areas 15a to
15c and supplying drive signals having different delay times, it is possible to perform control
with higher freedom with respect to the directivity characteristic.
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[0051]
If the number of vibration areas 15a, 15b,... For dividing the diaphragm 1 ′ increases, the area
of the diaphragm 1 also increases according to the number of drive areas. As a result, the
permanent magnet plate 2 is easily bent, and the variation in the gap between the permanent
magnet plates 2 also tends to be large. For this reason, when the diaphragm 1 is divided into
three or more drive areas, it is particularly preferable to provide a gap regulating means for
regulating the gap of the permanent magnet plate 2.
[0052]
Third Embodiment In the above embodiment, an example in which the gap restricting means is
disposed between the drive areas 15a to 15c has been described. On the other hand, in the
present embodiment, the case where the gap regulating means is provided in the drive area 15b
will be described.
[0053]
FIG. 13 is a view showing an example of the configuration of the main part of a thin double-sided
speaker 100 according to Embodiment 3 of the present invention, in which an example of the
configuration of the diaphragm 1 is shown. This diaphragm 1 ′ ′ is also divided into three
vibration areas 15a to 15c, but differs from the diaphragm 1 ′ of FIG. 12 in that three fastening
holes 1j are formed in the vibration area 5b. That is, fastening means consisting of three sets of
bolts 20, spacers 21 and nuts 22 is disposed in the vibration area 5b.
[0054]
Generally, in the thin double-sided speaker, when the gap width between the permanent magnet
plates 2 is out of a predetermined range, the speaker characteristics are significantly
deteriorated. Therefore, instead of providing the gap restricting means between the drive areas
15a to 15c, a gap restricting means may be provided in the drive area 15b to make the gaps
between the permanent magnet plates 2 uniform.
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[0055]
In this case, when the linear pattern 12 interfering with the fastening hole 1j is thinned out in the
vibration area 15b, a non-vibration area is formed in the vibration area 5b, and the area of each
vibration area 15b becomes substantially narrow. There is a problem of deterioration. Therefore,
by using a detour straight pattern 12m having a detour pattern 12n detouring the fastening hole
1j, a non-vibrating area is minimized in the vibrating area 15b generated by arranging the
fastening hole 1j.
[0056]
Incidentally, the detour pattern 12 n is opposed to the permanent magnet plate 2 other than the
neutral zone by expanding the fastening holes 2 j of the permanent magnet plate 2 to face the
fastening holes 1 j and the detour pattern 12 n of the diaphragm 1 ′ ′. Is the same as in the
first and second embodiments described above.
[0057]
Fourth Embodiment
In the above embodiment, the linear pattern 12 extends in parallel with the longitudinal direction
of the diaphragm 1, and the mutually opposing sides of the two or more vibration areas 15a to
15c, that is, the boundary lines of the vibration areas 15a to 15c are linear patterns 12 An
example in the case of being parallel to has been described. On the other hand, in the present
embodiment, the case where the linear pattern 12 extends in parallel with the short direction of
the diaphragm 1, and the boundary between the vibration areas 15a and 15b intersects the
extension direction of the linear pattern 12 Do.
[0058]
FIG. 14 is a view showing an example of the configuration of the main part of a thin double-sided
speaker 100 according to a fourth embodiment of the present invention, in which an example of
the configuration of the diaphragm 1 is shown. The diaphragm 1 ′ ′ ′ is divided into two
vibration areas 15a and 15b. Compared to the case of the diaphragm 1 (embodiment 1) of FIG. 4,
the linear pattern 12 is divided substantially at the center, and one of them is in the vibration
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area 15 a and the other is in the vibration area 15 b. .
[0059]
The linear pattern 12 is disposed in parallel with the width direction of the diaphragm 1 ′ ′ ′,
and a multipole magnetization pattern (not shown) is also disposed in parallel with the width
direction. The boundary between the vibration areas 15a and 15b is orthogonal to the extending
direction of the linear pattern 12 and the multipole magnetization pattern (not shown). That is,
when the diaphragm 1 is divided into two or more vibration areas 15a and 15b, the opposing
sides of the two or more vibration areas 15a and 15b have the straight line pattern 12 and the
landing side as shown in the first to third embodiments. It can be divided so as to match the
extending direction of the magnetic pattern, or can be divided so as to intersect as shown in this
embodiment.
[0060]
In the above embodiment, an example in which the straight patterns 12 belonging to the same
vibration areas 15a to 15c are connected to form a serpentine pattern has been described.
However, the present invention is not limited to such a case. That is, as long as the current flows
in the reverse direction to the linear patterns 12 adjacent to each other, it is sufficient that a
large number of linear patterns 12 are connected, and the present invention is not limited to the
meandering pattern.
[0061]
1, 1 ', 1' ', 1' '' Diaphragm 1j Fastening hole 1t Feeding terminal 2 Permanent magnet plate 2h
Sound emitting hole 2j Fastening hole 3 Housing panel 3h Sound emitting hole 3t Terminal hole
4 Housing frame 4t Terminal hole DESCRIPTION OF SYMBOLS 10 resin film 11, 11a-11c wiring
pattern 12 linear pattern 12m detouring linear pattern 12n detouring pattern 14 protective film
15a-15c vibration area 50 sound source device 51 delay circuit 100 thin double-sided speaker bs
buffer sheet et external terminal
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