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JP2000115887

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DESCRIPTION JP2000115887
[0001]
The present invention belongs to the technical field of a speaker unit for emitting sound, which is
used in an audio device such as an audio device, which suppresses the natural resonance of a
diaphragm generated at the time of driving, and this natural resonance The present invention
belongs to the technical field of a high fidelity speaker unit that emits a clear sound with less
distortion and good distortion by preventing the modulation of the reproduced sound due to.
[0002]
2. Description of the Related Art Conventionally, a speaker system in an audio apparatus is
constructed by attaching a speaker unit to a front plate of a speaker cabinet formed in a box
shape. And in this speaker system, the reproduction ¦ regeneration sound generate ¦ occur ¦
produced from a speaker is radiated ¦ emitted to the front of a speaker cabinet.
[0003]
By the way, such a speaker unit suppresses the natural resonance of the diaphragm of the
speaker generated at the time of driving as much as possible to prevent the modulation of the
reproduced sound by the natural resonance, thereby making the reproduced sound a clear sound
with as little distortion as possible. It is required to radiate closely to the original sound.
Therefore, conventionally, various measures have been taken to improve the sound quality of the
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reproduced sound from the speaker unit with respect to each part of the speaker unit, that is, the
diaphragm of the speaker, the magnet of the speaker, the voice coil of the speaker, and the
speaker cabinet etc. It has been taken.
[0004]
Among various measures for improving the sound quality of the reproduced sound, the following
measures are taken for the diaphragm of the speaker. That is, in designing the diaphragm, it is
necessary to reduce the mass to improve the efficiency and the sound rise, to use a material with
high rigidity to widen the reproduction frequency band and obtain a large volume, and to reduce
the resonance. In order to improve the transient characteristics of the sound quality, it is
important to use a material having a large internal loss, etc., and the diaphragm is designed.
[0005]
In addition, since the diaphragm of the speaker has several natural resonance frequencies
including the lowest resonance frequency emphasized in design, when the speaker is driven,
resonance occurs at these natural resonance frequencies, and radiation occurs. In order to
modulate other sounds, a sound wave of distorted waveform which is not identical to the
waveform of the input signal is emitted. Therefore, in order to prevent unnecessary resonance of
the diaphragm, conventionally, measures such as applying a vibration absorbing material to the
entire diaphragm or the edge portion of the diaphragm or providing concentric corrugations are
also performed. ing. In particular, the mass of the diaphragm is an important element in the
design for improving the sound quality of the reproduced sound, and another mass is simply
added to the diaphragm to adjust the mass of the diaphragm in an attempt to improve the sound
quality. On the other hand, it is technical common sense in the technical field of the speaker unit
that the sound quality is deteriorated and the sound volume is lowered by adding. Therefore, in
the past, simply adding another mass to the diaphragm has not been performed.
[0006]
However, adding another mass to the diaphragm is performed. For example, a speaker that is
actually marketed has a double type in which another small cone-shaped diaphragm is provided
at the center of the cone-shaped diaphragm to improve the sound quality of the high-pitched
range.・ There is a cone type speaker. However, the small-cone diaphragm in this double-cone
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speaker is the one in which the main-cone diaphragm and the small-cone diaphragm are
interrelated and pre-computed at the time of design. After the manufacture of the above, the
small cone-shaped diaphragm is not simply added to the main cone-shaped diaphragm
independently of the cone-shaped diaphragm.
[0007]
However, even in the conventional speaker unit in which various measures for improving the
sound quality are taken, good sound quality is not yet sufficiently obtained. One of the causes is
that, generally, the rigidity of the material of the diaphragm decreases the internal loss, and
conversely, the reduction of the rigidity increases the internal loss. That is, it is a condition that
the large rigidity required for the diaphragm to obtain a large volume and increase the efficiency
and the large internal loss for reducing the resonance and improving the sound quality are
contradictory. Therefore, although various studies have been made on the material of the
diaphragm that has as high rigidity as possible and the largest internal loss as possible, the
material of the desired diaphragm has not been obtained yet. For this reason, at present, they are
forced to obtain good sound quality.
[0008]
Actually, when a music signal is input to a conventional speaker and the reproduced sound is
listened to, the reproduced sound can not only be heard in a narrower range than the original
frequency band of the input signal, but also the timbre of the instrument or the person's Voice
may also feel different from the original sound. That is, in the speaker unit, a phenomenon
similar to the conventionally known "box noise" phenomenon due to the standing wave
generated inside the speaker cabinet occurs in the diaphragm, and this phenomenon is an
unnecessary natural resonance of the diaphragm as described above. Is considered to be due to
[0009]
Conventionally, measures have been taken by the vibration absorbing material and the
corrugation as described above for the natural resonance of the diaphragm, but in the
conventional measures, the natural resonance of the diaphragm can be effectively prevented. It
can not be done.
[0010]
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The present invention has been made in view of such problems, and its object is to effectively
absorb the natural resonance of the diaphragm to suppress the modulation of the reproduced
sound due to the natural resonance, thereby achieving the transient characteristic. It is an object
of the present invention to provide a high-fidelity speaker unit which is good and makes a
reproduced sound a clear sound with as little distortion as possible.
[0011]
SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the speaker
unit according to the invention of claim 1 is a speaker unit that emits a sound when the
diaphragm is vibrated. It is characterized in that a damping device for suppressing the natural
resonance of the plate is attached.
[0012]
The invention according to claim 2 is characterized in that the diaphragm is a cone-shaped
diaphragm, and the damping device is attached to the front side of the cone-shaped diaphragm.
Furthermore, the invention according to claim 3 is characterized in that the diaphragm is a coneshaped diaphragm, and the damping device is attached to the back side of the cone-shaped
diaphragm.
[0013]
Furthermore, the invention according to claim 4 is characterized in that the diaphragm is a flat
diaphragm, and the damping device is attached to the front side or the back side of the flat
diaphragm.
Furthermore, according to the invention of claim 5, the support member is detachably supported
by the diaphragm, the damping device is fixed to the support member, and the support member
has a band-like thin plate in a bow shape. It is characterized in that it is curved and formed to
have elasticity.
[0014]
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Further, according to the invention of claim 6, the vibration damping device comprises an arm
portion fixed and supported at one end, and a mass portion continuous with the arm portion and
having a center of gravity at a position eccentric to the arm portion in the longitudinal direction.
It is characterized in that it is provided with a vibration control plate.
[0015]
Furthermore, according to the invention of claim 7, in the damper plate, a part of the mass
portion is extended to the arm portion side from a connecting portion with the arm portion, and
the mass portion and the part A gap of a predetermined width and a predetermined length is
formed between the arm and the arm, and has a predetermined natural frequency band.
[0016]
In the speaker unit of the present invention thus configured, when a music signal is input to the
speaker at the time of driving the speaker unit, the diaphragm is vibrated by the electrical signal
energy and a sound wave is emitted.
In this case, the diaphragm is subjected to natural resonance at some of the natural frequencies
of the diaphragm to try to modulate sound at other frequencies.
However, at this time, since the natural resonance of the diaphragm is suppressed by the
damping device, modulation to other sounds is effectively suppressed.
[0017]
Also, since the natural resonance of the diaphragm is effectively suppressed by the damping
device, the vibration damping of the diaphragm can be accelerated.
This improves the transient characteristics of the speaker so that the emitted sound will be a
good rise, a good break, and an unmodulated clear sound.
[0018]
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In this manner, in the speaker unit of the present invention, the same phenomenon as the wellknown "box noise" phenomenon due to the standing wave generated in the inside of the speaker
cabinet that occurs in the diaphragm is prevented. That is, the reproduced sound can be heard in
a range closer to the original frequency band of the input signal, and the tone of the musical
instrument and the human voice can be felt almost the same as the original sound.
[0019]
Furthermore, in the present invention, the support member to which the damping device is fixed
is removably supported on the diaphragm. Therefore, even a general user of the speaker can
easily attach the damping device to the diaphragm of the existing speaker. In that case, since the
support member is formed to be curved in an arch shape and has elasticity, this elasticity ensures
that the support member is attached to the diaphragm without being separated by its vibration.
[0020]
BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be
described below with reference to the drawings. FIG. 1 shows an example of an embodiment of a
speaker unit according to the present invention, where (a) is a front view and (b) is a right side
view with a part cut away.
[0021]
As shown in FIGS. 1 (a) and 1 (b), the speaker unit 1 of this example is a conventionally known
cone-shaped speaker unit, and a frame 2 and a cone-shaped diaphragm 3 supported by the frame
2 are provided. And the voice coil unit 4 and the magnet unit 5.
[0022]
A damping device 7 is attached to the inside (front side) of the cone-shaped diaphragm 3 via the
support member 6.
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As shown in FIG. 2, the support member 6 is formed of a pair of resin-made thin strip members,
and each of the thin strip members is formed by curving its longitudinal cross section into an
arch shape and has elasticity. ing. Each band-shaped thin plate has a supporting portion 6a on
which the damping device 7 is fixedly supported, and a pair of leg portions 6b are formed so as
to smoothly and continuously extend from the supporting portion 6a. An attaching portion 6 c
detachably attached to the cone-shaped diaphragm 3 is formed at the tip of each of the leg
portions 6 b. The pair of strip-like thin plates is formed by superposing the two supporting
portions 6a in a cruciform shape, and is bonded to each other by an appropriate adhesive means
such as an adhesive or a double-sided adhesive tape. In the support member 6, the attachment
portions 6c of the legs 6b are attached and fixed to the inner surface (front side) of the coneshaped diaphragm 3 by an appropriate adhesive means such as an adhesive or a double-sided
adhesive tape. As a result, the attachment portion 6c of the support member 6 is fixed to the
front side of the cone-shaped diaphragm 3 at four points, so that the vibration of the coneshaped diaphragm 3 can be taken out from four points. Can be absorbed. The vibration of the
cone-shaped diaphragm 3 can be taken out from two places or six places or more by using one or
three or more suitable strip-like thin plates.
[0023]
The damping device 7 is constituted by a damping device disclosed in Japanese Patent
Application Laid-Open No. 10-164681 filed by the present applicant. The details of the damping
device can be understood by referring to this publication, and thus the description thereof will be
omitted. However, the damping device 7 will be briefly described.
[0024]
As shown in FIGS. 3 (a) and 3 (d), the vibration control device 7 is formed of two types of three
types of vibration control plates 7a, 7b and 7c formed of resin such as polypropylene and having
the same shape and different dimensions. It has a total of six. Each of these damping plates 7a,
7b and 7c is composed of arms 7a1, 7b1 and 7c1 and mass 7a2, 7b2 and 7c2, respectively, and
these arms 7a1, 7b1 and 7c1 and mass 7a2, 7b2 and 7c2 Are connected and integrally formed.
In that case, while a part of mass part 7a2, 7b2, 7c2 is extended to arm part 7a1, 7b1, 7c1 side
from a connection part with arm part 7a1, 7b1, 7c1, mass part 7a2, 7b2, 7c 2 Between the part
and the arms 7a1, 7b1 and 7c1, gaps 7a5, 7b5 and 5c5 with a predetermined width and a
predetermined length are formed, and as shown in FIG. 4, these damping plates 7a, 7b and 7c
Each has a different predetermined frequency band. In this case, the vibration plates 7a, 7b and
7c generally have their natural frequencies higher in this order and the degree of ease of
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resonance smaller in these orders.
[0025]
Then, a part of the eigenfrequency band of the damping plate 7a and a part of the
eigenfrequency band of the damping plate 7b overlap each other, and with another part of the
eigenfrequency band of the damping plate 7b. The natural frequency bands of the respective
vibration damping plates 7a, 7b and 7c are set such that the natural frequency bands of the
vibration damping plates 7c overlap with each other.
[0026]
In this manner, the total natural frequency band of the vibration damping device 7 as a whole
from the minimum natural frequency of the vibration damping plate 7a to the maximum natural
frequency of the vibration damping plate 7c by the respective vibration damping plates 7a, 7b,
7c The natural frequency band is wide (for example, about 20 Hz to about 250 Hz).
Therefore, in the speaker unit 1 of this example, the natural vibration of the cone-shaped
diaphragm 3 is effectively suppressed by the damping device 7 over a wide frequency range.
[0027]
Further, since the natural frequency is different depending on the size of the damping plates 7a,
7b, 7c, the natural frequency can be adjusted by appropriately setting the sizes of the damping
plates 7a, 7b, 7c. The natural frequency also differs depending on the mass size of the mass
portions 7a2, 7b2 and 7c2 or the thickness of the arm portions 7a1, 7b1 and 7c1, and
accordingly, these values of the dampers 7a, 7b and 7c are appropriately set. Thus, the natural
frequency can be adjusted as well.
[0028]
Then, the fixed ends of the arm portions 7a1, 7b1 and 7c1 of each of the vibration control plates
7a, 7b and 7c are sandwiched between the pair of fixed support members 7d and joined with an
adhesive, thereby a vibration control device 7 is configured. Then, the damping device 7
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configured in this way is joined and supported to the support portion 6a of the support member
6 by an appropriate adhesive means such as an adhesive or a double-sided adhesive tape. In
addition, each damping board 7a, 7b, 7c and a pair of fixed support member 7d can also be
manufactured integrally by injection molding.
[0029]
In the speaker unit 1 of this example configured as described above, when a music signal is input
to the speaker at the time of driving the speaker unit, the cone-shaped diaphragm 3 is forced to
move in a piston by the electric signal energy and vibrates. Sound waves are emitted, in which
case the cone-shaped diaphragm 3 is subjected to natural resonance at some natural frequencies
of the cone-shaped diaphragm 3 to try to modulate sounds of other frequencies. . However, at
this time, due to the natural resonance of the cone-shaped diaphragm 3, the respective damping
plates 7a, 7b, 7c also vibrate via the support member 6 and the fixed support member 7d. In that
case, when the natural vibration frequency of the cone diaphragm 3 is within the natural
frequency band of one damping plate, the natural vibration frequency of the natural resonance f
of the cone diaphragm 3 is the same. The damping plate resonates by plate vibration. Then, the
kinetic energy of the natural vibration of the cone-shaped diaphragm 3 is converted into heat
energy by the internal friction at the arm portion of the damper plate generated by the resonance
of the damper plate and dissipated.
[0030]
Thereby, in the speaker unit 1 of this example, the natural vibration of the cone-shaped
diaphragm 3 is effectively suppressed by the damping device 7 over the wide frequency range
shown in FIG.
[0031]
And since the resonance energy of the above-mentioned cone diaphragm 3 is absorbed by such
resonance of each damping board 7a, 7b, 7c, the resonance of the cone-shaped diaphragm 3 is
suppressed, and to the other sound. Modulation is effectively suppressed.
[0032]
In addition, since the natural resonance of the cone-shaped diaphragm 3 is effectively suppressed
by the resonance of each of the dampers 7a, 7b and 7c, the vibration damping of the cone-
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shaped diaphragm 3 can be accelerated.
This improves the transient characteristics of the speaker so that the emitted sound will be a
good rise, a good break, and an unmodulated clear sound.
[0033]
Furthermore, when music signals are alternately input to the speaker unit 1 to which the
vibration damping device 7 is attached and the speaker unit of the same speaker to which the
vibration damping device 7 is not attached, the volume of the reproduced sound is compared.
There was no difference.
That is, even if the damping device 7 is attached to the cone-shaped diaphragm 3, there is no
energy loss of the input music signal, and the energy of the input electric signal is converted as it
is to sound wave energy. Become. This is considered that the damping device 7 absorbs only the
natural resonance energy of the cone-shaped diaphragm 3 and the standing wave energy
generated inside the cabinet.
[0034]
Also, actually, when the vibration control device 7 attached to the speaker is seen in a state
where the volume of the speaker is increased, each of the vibration control plates 7a, 7b, 7c
reacts to the sound in each resonance frequency band. Thus, it is possible to visually recognize
that the arms 7a1, 7b1, 7c1 are bent and twisted while being resonated. This demonstrates that
the damping device 7 absorbs only the natural resonance energy of the cone-shaped diaphragm
3 and the standing wave energy generated inside the cabinet.
[0035]
Thus, in the speaker unit 1 of this example, a phenomenon similar to the conventionally known
"box noise" phenomenon due to the standing wave generated in the interior of the cabinet in the
speaker system, which occurs in the cone-shaped diaphragm 3, is prevented Be done. That is, the
reproduced sound can be heard in a range closer to the original frequency band of the input
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signal, and the tone of the musical instrument and the human voice can be felt almost the same
as the original sound.
[0036]
In the speaker unit 1 of this example, although six types of three types of vibration control plates
7a, 7b and 7c are used in total, six may be used, but one or more types of vibration control plates
may be provided. The number of different types of damping plates can be appropriately set, and
various damping plates can be used in a desired combination.
[0037]
Moreover, in the speaker unit 1 of the above-mentioned example, although the support member
6 shall be curving in the longitudinal cross-sectional shape into arch shape, the support member
6 does not necessarily need to be curved in arch shape, It is arbitrary It can also be of
longitudinal cross-sectional shape.
[0038]
FIGS. 5 (a) to 5 (c) show another example of the embodiment of the speaker unit according to the
present invention, and FIG. 5 (a) partially shows the attachment state of the damping device and
the cone-shaped diaphragm. 1B is a cross-sectional view corresponding to a portion P, FIG. 1B is
a plan view of the locking member, and FIG. 1C is a cross-sectional view taken along the line VCVC in FIG.
[0039]
Furthermore, in the speaker unit 1 of the above-mentioned example, although the attaching part
6c of the support member 6 is fixed to the cone-shaped diaphragm 3, as shown to Fig.5 (a), in the
speaker unit of this example, it locks. The member 8 is fixed to the surface of the cone-shaped
diaphragm 3 by an appropriate adhesive means such as an adhesive or a double-sided adhesive
tape, and the mounting portion 6 c of the support member 6 is engaged with the engagement
member 8 in an interlocking manner. {The same as the attachment part 6c of the support
member 6 and the attachment part of the cone-shaped diaphragm 3 other than the P part in FIG.
1B}, the damping device 7 is detachably attached to the cone-shaped diaphragm 3 There is.
As shown in FIGS. 6 (b) and 6 (c), the locking member 8 is made of a base 8a made of an
appropriate material such as paper or resin, and a resin joined to the base 8a with an adhesive or
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the like. It consists of a locking plate 8b made of a relatively thin resin such as a film.
The pedestal 8 a is formed in a rectangular shape, and the thickness thereof is set equal to or
slightly larger than the thickness of the mounting portion 6 c of the support member 6.
Further, a long hole 8c extending in the longitudinal direction is formed at the center of the
pedestal 8a. As shown in FIG. 6 (b), the width of the elongated hole 8c is set equal to or slightly
larger than the width of the mounting portion 6c of the support member 6.
[0040]
Further, a through hole 8d is bored in the locking plate 8b, and the mounting portion 6c of the
support member 6 and a portion 6b 'of the leg portion 6b continuous to the mounting portion 6c
can pass through the through hole 8d. The size is set. When the pedestal 8a and the locking plate
8b are joined, the through hole 8d of the locking plate 8b is opened in the long hole 8c.
[0041]
In the locking member 8 configured as described above, the pedestal 8a is joined to the surface
of the cone-shaped diaphragm 3 by an appropriate adhesive means such as an adhesive or a
double-sided adhesive tape as shown in FIG. Thus, a predetermined space is formed between the
locking plate 8b and the surface of the cone-shaped diaphragm 3 in the region of the long hole
8c of the pedestal 8a. Then, the attachment section 6c of the support member 6 having a
resilient cross-section with a bow in the longitudinal direction section and a portion 6b 'of the leg
6b continuing to the attachment section 6c are slightly bent using the elasticity of the support
member 6. The support member 6 is formed in a cone shape by penetrating the through hole 8d
while letting the mounting portion 6c enter into this space and sandwiching it between the
locking plate 8b and the cone-shaped diaphragm 3 with a predetermined clamping pressure. It is
detachably and easily attached to the surface of the diaphragm 3. When the support member 6 is
removed from the cone-shaped diaphragm 3, the attachment portion 6c of the support member 6
and a portion 6b 'of the leg portion 6b continuous with the attachment portion 6c are slightly
bent using the elasticity of the support member 6. However, the support member 6 can be easily
removed from the cone-shaped diaphragm 3 by escaping from the through hole 8 d.
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[0042]
Thus, in a state where the support member 6 is attached to the surface of the cone-shaped
diaphragm 3, the locking portion 6c is always urged in the diagonally upper right direction
(arrow direction) in FIG. 5B by the elasticity of the support member 6. Become so. That is, the
locking portion 6c is always biased by the elasticity of the support member 6 in a direction away
from the through hole 8d of the locking plate 8b. Further, as shown in FIG. 5 (b), both side edges
of the locking portion 6c of the support member 6 are in contact or almost in contact with both
side walls of the long hole 8c of the pedestal 8a. As a result, the side edges of the locking portion
6c are supported by the side walls of the long hole 8c in the left-right direction in FIG. 7B (that is,
in the circumferential direction in FIG. 1A). Therefore, even if the cone-shaped diaphragm 3
vibrates when the speaker is driven, the locking portion 6c of the support member 6 does not
come out of the through hole 8d depending on this vibration, and the locking portion 6c is
shown in FIG. 1), and the support member 6 is securely attached to the surface of the coneshaped diaphragm 3. As shown in FIG. The other configuration and other operation and effects of
the speaker unit of this example are the same as the example shown in FIG. 1 described above.
[0043]
FIG. 6 shows still another example of the embodiment of the speaker unit according to the
present invention, where (a) is an arrow view from the direction of arrow VIA in (b), and (b) is a
right side It is a front view.
[0044]
In the speaker unit 1 of the above-mentioned example, the damping device 7 provided with the
respective dampers 7a, 7b, 7c is provided inside (front side) of the cone-shaped diaphragm 3, but
the speaker unit 1 of this example In this case, each vibration control plate 7 is provided on the
outer side (back side) of the cone-shaped vibration plate 3.
[0045]
That is, as shown in FIGS. 6 (a) and 6 (b), the damping device 7 is attached to the outside (back
side) of the cone-shaped diaphragm 3 by an adhesive via the support member 6 consisting of a
thin plate made of resin. ing.
The support member 6 in this example is formed by bending a resin thin plate.
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[0046]
Further, in the vibration damping device 7 of this example, four types of vibration damping
plates 7a, 7b, 7c, 7d formed in the same shape and having different dimensions are provided on
an annular fixed support member 7e made of a resin thin plate. A total of eight sheets are
attached and configured.
[0047]
Also in the speaker unit 1 of this example, the same function and effect as those of the speaker
unit 1 of the above example can be obtained, that is, the resonance of the cone type diaphragm 3
is wider by each of the dampers 7a to 7d. Because it is effectively suppressed over the frequency
range, the modulation due to the natural resonance is reduced and at the same time the transient
characteristics are better, the sound emitted is a good sound of the rise, a good sound of the
break, and a clear not modulated. It becomes a sound.
In particular, in the speaker unit 1 of this example, since the vibration damping device 7 is
provided on the back side of the cone-shaped diaphragm 3, the vibration damping device 7 can
not be seen from the front of the speaker unit 1, so the appearance is improved. .
[0048]
Further, in the speaker unit 1 of this example, the vibration control plates 7a, 7b and 7c are
positioned between the frame and the diaphragm, and the vibration control plates 7a, 7b and 7c
are thereby protected by the frame. The handling of the speaker unit 1 attached with the device
7 becomes convenient.
[0049]
FIGS. 7A and 7B are diagrams showing still another example of the embodiment of the speaker
unit according to the present invention.
Although the speaker unit 1 of each of the examples described above is a speaker unit provided
with the cone-shaped diaphragm 3, as shown in FIGS. 7 (a) and 7 (b), the speaker unit 1 of this
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example is conventionally known. An appropriate number (two in the illustrated example) of
damping devices 7 is provided on the outside (front side) or the inside (back side) of the flat
diaphragm 3.
In the speaker unit 1 of this example as well, similar to the operation and effect of the speaker
unit 1 of each of the examples described above, the natural resonance of the flat diaphragm 3 is
effectively suppressed over a wide frequency range by each vibration damping plate become.
[0050]
8A and 8B show a modification of the vibration control device 7. FIG. 8A shows a vibration
control device, FIG. 8B shows a vibration control plate used in the vibration control device, and
FIG. It is a bottom view of b). As shown in FIG. 8A, in this vibration damping device 7, the
vibration damping plates 7a, 7b and 7c are formed in the same shape by resin as the vibration
damping plates 7a, 7b and 7c shown in FIG. However, the mass of these damping plates 7a, 7b,
7c is made larger than that of the damping plates 7a, 7b, 7c shown in FIG. That is, as shown in
FIGS. 8 (b) and 8 (c), the vibration control plates 7a, 7b and 7c are the same as the resin plates
7a3, 7b 3 and 7c3 (the same as the vibration control plates 7a, 7b and 7c shown in FIG. And
other thin plates 7a4, 7b4 and 7c4 made of metal such as lead or the like having the same shape
as the mass portions 7a2, 7b2 and 7c2 are single-sided or double-sided (both sides in the
illustrated example) It is formed by being joined to. As a result, the mass of the damper plate is
adjusted, so that the natural frequency band is shifted to the lower side. Further, since the
amount of absorbed energy is proportional to the mass of the damping plate, the energy
absorption effect can be appropriately adjusted by adjusting the mass of the damping plate in
this manner.
[0051]
FIG. 9 is a view showing another modification of the vibration damping device 7. Although three
types of damping plates 7a, 7b and 7c are used in the damping device 7 of each example
described above, in the damping device 7 of this example, four types of damping plates 7a ', 7b'
and 7c are used. ', 7e' are used. And although the mass part 7a2, 7b2, 7c2 is formed by notching
a part of right triangle in the damping board of each above-mentioned example, damping board
7a ', 7b', 7c of this example In 'and 7f', the mass portions 7a2 ', 7b2', 7c2 'and 7f2' are simply
formed in a rectangular shape, and formed in an L-shape as a whole. Further, the fixed support
member 7d 'of the damping device 7 of this example is formed in a rectangular shape. The other
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configuration of the vibration damping device 7 in this example is the same as the abovedescribed examples. In addition, it is not limited to the damping device of each above-mentioned
example, Various design changes are possible within the scope of the present invention.
[0052]
As apparent from the above description, according to the speaker unit according to the present
invention, the vibration suppressing device suppresses the natural resonance occurring in the
diaphragm at the time of driving the speaker unit. The modulation to other sounds due to the
natural resonance of the plate can be effectively suppressed.
[0053]
Further, since the natural resonance of the diaphragm can be effectively suppressed by the
damping device, it is possible to accelerate the vibration damping of the diaphragm.
As a result, since the transient characteristics of the speaker can be improved, the emitted sound
can be made to have a good rising sound, a good breaking sound, and an unmodulated clear
sound.
[0054]
Thus, in the speaker unit according to the present invention, the reproduced sound can be heard
in a range closer to the original frequency band of the input signal, and the tone of the musical
instrument and the human voice feel almost the same as the original sound. And a high-fidelity
speaker unit can be formed.
[0055]
Further, even by combining the vibration control device used in the present invention at the time
of designing the speaker with the diaphragm having high rigidity and small internal loss such as
the diaphragm of the conventional speaker, even the diaphragm of the conventional speaker can
be obtained. Thus, it is possible to form a diaphragm in which high rigidity and high internal loss
are compatible.
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