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DESCRIPTION JP2006050369

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DESCRIPTION JP2006050369
PROBLEM TO BE SOLVED: To provide a speaker capable of reducing resonance frequency and
improving sound pressure in a low frequency band. SOLUTION: Of the vibration generating
means, a coil C, a yoke 6, and a magnet are arranged in a direction in which their longitudinal
directions are orthogonal to the direction of the connecting parts 5a and 5a of the excitation
member 5. Thus, the distance L2 between the connecting portion 5a of the excitation member 5
and the lateral current path Cb of the coil C on which the magnetic driving force acts can be
made longer than the distance in the conventional speaker. As a result, compared to the
conventional case, the resonant frequency of the diaphragm can be lowered, and the amplitude
of vibration of the diaphragm in the low frequency band can be increased. Therefore, the
amplitude of the vibration of the panel transmitted from the diaphragm in the low frequency
band also increases, and the panel can exhibit a large volume. That is, the sound pressure of the
sound emitted from the panel can be increased. [Selected figure] Figure 3
スピーカ
[0001]
The present invention relates to a speaker including a diaphragm, an excitation member, and
vibration generating means, and more particularly to a speaker capable of reducing the
resonance frequency and improving the sound pressure in a low frequency band.
[0002]
FIG. 9 is a perspective plan view of an electronic device provided with a conventional speaker as
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viewed from the front surface side of the panel, and FIG. 10 is a cross-sectional view taken along
line II of FIG.
In FIG. 10, in order to clarify the position of the longitudinal current path of the coil, the
longitudinal current path on the X2 side of the coil is indicated by a dotted line.
[0003]
FIG. 9 shows the electronic device 101 in which the speakers 100 and 100 are mounted, and the
transparent panel 103 is provided on the front surface (Z1 side) of the housing 102. At the back
side (Z2 side) of the panel 103, the speakers 100, 100 are disposed inside the left and right sides
(X1 side and X2 side) of the panel 103.
[0004]
In the speaker 100, when the coil C is energized based on an audio signal or the like, the
diaphragm 104 and the excitation member 105 move in the Z1-Z2 direction as illustrated by the
magnetic driving force acting on the longitudinal current paths Ca and Ca. Self vibration is
generated, and in particular, the diaphragm 104 is amplified by the vibration operation of the
excitation member 105 and vibrated in the Z1-Z2 direction. Since the diaphragm 104 is fixed to
the plate member 108 via the transmission member 107 made of synthetic resin, the amplitude
of the diaphragm 104 is reliably transmitted to the plate member 108 and the panel 103 via the
transmission member 107.
[0005]
As a panel type speaker which makes a panel vibrate and makes it sound, there is also one as
described in Patent Document 1 below.
[0006]
In the loudspeaker described in Patent Document 1 below, a large-sized panel is stacked with a
small-sized panel having a smaller area than that, and a driving means is attached to the smallsized panel.
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In this speaker, when the drive means is driven, the small panel vibrates, the vibration of the
small panel is transmitted to the large panel, and a sound is emitted from the large panel and the
small panel, thereby wide frequency band The output of is obtained. Japanese Patent Application
Publication No. 2002-505814
[0007]
By the way, as shown in FIGS. 9 and 10, the excitation member 105 is formed longitudinally in
the Y1-Y2 direction shown, and the coil C, the magnet 106 and the yoke 109 are also formed
longitudinally in the Y1-Y2 direction shown. .
[0008]
The excitation member 105, the coil C, the magnet 106 and the yoke 109 are all directed in the
longitudinal direction, the coil C is attached to the back surface of the diaphragm 104, and the
magnet 106 and the yoke 109 are attached to the surface of the excitation member 105.
[0009]
9 and 10, the left connecting portion 105a on the Y2 side connecting the diaphragm 104 and the
excitation member 105, and the left of the longitudinal current path Ca of the coil C on which the
magnetic driving force acts. (Y2 side) A distance L1 to the side end Ca2, a right connecting
portion 105b on the Y1 side connecting the diaphragm 104 and the excitation member 105, and
a longitudinal current path Ca of the coil C on which the magnetic driving force acts. The
distance L1 with the right (Y1 side) side end Ca1 becomes short.
[0010]
Therefore, the resonant frequency of the diaphragm 104 is increased, and the amplitude of the
vibration of the diaphragm 104 in the low frequency band is reduced.
As a result, in the low frequency band, the amplitude of the vibration of the panel 103
transmitted from the diaphragm 104 also decreases, and the sound pressure emitted from the
panel 103 decreases.
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In addition, in the low frequency band, a phenomenon that sound pressure falls may occur.
[0011]
In the invention described in Patent Document 1, since the large panel has high rigidity and a
relatively high band with a resonance frequency of 1 kHz or more, even if the volume can be
secured in the high frequency range, the low frequency of several hundred Hz With respect to
the tone range, the amplitude of the large panel can not be increased, and a sufficient volume can
not be obtained.
Therefore, when the large panel is made to sound, the high range becomes dominant, and it is
difficult to obtain the sound quality like a general speaker.
[0012]
In particular, in the case where the drive means is provided at a position near the side edge
rather than the central portion of the large panel, the drive means is provided when the
periphery of the large panel is fixed. It is difficult to increase the volume in the low frequency
range because the panel's resonant frequency at the part is high.
[0013]
If the large-sized panel is made thin and soft, it is too soft to be disposed on the surface of the
device, and the propagation characteristics of vibration are also poor, so that it is not possible to
secure a large volume in the low frequency range.
[0014]
The present invention is to solve the above-mentioned conventional problems, and it is an object
of the present invention to provide a speaker capable of reducing the resonance frequency and
improving the sound pressure in the low frequency band.
[0015]
According to the present invention, there is provided a speaker comprising: a diaphragm; an
excitation member made of a magnetic material whose both end portions are fixed to the back
surface of the diaphragm; and vibration generating means for vibrating the excitation member
The means includes a magnet provided on one of the diaphragm or the excitation member and a
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coil provided on the other, and the magnet and the coil are both formed in an elongated shape,
and the two side ends of the excitation member The longitudinal direction of the magnet and the
coil is disposed in a direction orthogonal to the direction of.
[0016]
As described above, in the present invention, the longitudinal direction of the magnet and the coil
is disposed in the direction orthogonal to the direction of the both ends of the excitation member.
Therefore, the distance between both ends of the excitation member and the coil and the magnet
can be made longer than the distance in the conventional speaker.
As a result, the resonance frequency of the diaphragm can be lowered compared to the
conventional case, and the amplitude of vibration of the diaphragm in the low frequency band
can be increased, so that the sound pressure in the low frequency band can be increased. be able
to.
[0017]
In the present invention, preferably, the excitation member is provided with a mounting portion
extending in a direction orthogonal to the direction of the both side end portions, and the magnet
or the coil is mounted on the mounting portion.
[0018]
Further, the excitation member includes a plurality of excitation members having different
lengths in the direction of the both side end portions, and each excitation member is disposed
with a predetermined interval in a direction orthogonal to the direction of the both side end
portions. Preferably, longitudinal directions of the magnet and the coil are disposed across the
excitation members in a direction orthogonal to the direction of the both side ends of the
excitation members.
[0019]
In this way, each excitation member has a different resonance frequency, and the diaphragm can
be reliably vibrated at a predetermined amplitude even in a low resonance frequency band, and
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sound pressure can be prevented from falling.
[0020]
Furthermore, in the present invention, the flexural rigidity of the diaphragm is lower than the
flexural rigidity of the excitation member.
Thereby, the amplitude of the vibration of the diaphragm can be sufficiently larger than the
amplitude of the vibration of the excitation member, and the sound pressure in the low frequency
band can be more appropriately increased.
[0021]
According to the speaker of the present invention, the resonance frequency can be lowered to
improve the sound pressure in the low frequency band.
[0022]
FIG. 1 is a perspective plan view of an electronic device equipped with the speaker of the present
invention as viewed from the panel surface side, FIG. 2 is an exploded perspective view of the
speaker of the present invention, and FIG. 3 is a partial plan view of the speaker of FIG. 4 is a
cross-sectional view taken along the line IV-IV in FIG. 2, and FIG. 5 is a cross-sectional view taken
along the line V-V in FIG.
In addition, in FIG. 1, in order to clarify the structure of an electronic device, only the diaphragm
is shown among the speakers.
In FIG. 2, only the X2 speaker is shown in order to clarify the structure of the speaker.
In addition, in order to clarify the structure of the speaker, the portion on the X1 side of the
diaphragm is omitted.
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In FIG. 3, a diaphragm or the like provided on the Z1 side of the coil is omitted.
[0023]
FIG. 1 shows an electronic device 10 on which the speakers 1 and 1 of the present invention are
mounted, and a transparent panel 20 is provided on the front surface (Z1 side) of a housing 21.
In the present invention, the panel 20 functions as a sounding member. On the back side (Z2
side) of the panel 20, the speakers 1, 1 are disposed inside the left and right (X1-X2 direction)
side edges of the panel 20. Between the left and right speakers 1, an FPD (flat display unit) 30
having a shape shown by a two-dot chain line in FIG. 1 is disposed on the back side of the panel
20. The left and right speakers 1, 1 have the same configuration. Further, in the following
description, the X1-X2 direction in the drawing is the vertical direction, and the Y1-Y2 direction
in the drawing is the horizontal direction.
[0024]
As shown in FIG. 2, the speaker 1 is configured to include a diaphragm 2, an excitation member
5, and a vibration generating unit 3 that vibrates the excitation member 5.
[0025]
The diaphragm 2 has a longitudinally elongated shape in which the longitudinal length
dimension is larger than the transverse width dimension.
The diaphragm 2 is formed of, for example, a plate of a synthetic resin such as polycarbonate,
acryl, polyethylene terephthalate (PET).
[0026]
The excitation member 5 is formed of a magnetic material such as a steel plate, and as shown in
FIG. 2, the excitation member 5 is formed in a substantially cross shape.
[0027]
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In the excitation member 5, the end portions (hereinafter referred to as connecting portions) 5a,
5a facing the Y1 side and the Y2 side are bent upward in an L shape, and the connecting portions
5a, 5a are bonded to the back surface of the diaphragm 2. It joins by an agent etc.
[0028]
As shown in FIG. 2, a mounting portion 51 is provided which extends from the center in the
direction of the connecting portions 5a and 5a of the excitation member 5 (in the Y1-Y2
direction) to the X1-X2 direction in the drawing.
[0029]
The bent portions 5b, 5d, 5e bent upward are formed on the side surfaces of the excitation
member 5 other than the connecting portions 5a, 5a.
[0030]
As shown in FIG. 4, the dimensions of the excitation member 5 in the longitudinal direction
(directions of the both side connection parts 5a, 5a, Y1-Y2 direction) and the dimensions of the
diaphragm 2 in the longitudinal direction are formed to be substantially the same. The
connection portions 5a and 5a of the member 5 are fixed to both ends of the diaphragm 2 facing
the Y1 and Y2 sides with an adhesive or the like, and the diaphragm 2 is fixed in a state covering
all over the excitation member 5 and the mounting portion 51. Ru.
Further, the bent portions 5 b, 5 d, 5 e formed on the excitation member 5 are set so as not to hit
the back surface of the diaphragm 2.
Also, the flexural rigidity of the diaphragm 2 is sufficiently smaller than the flexural rigidity of
the excitation member 5.
[0031]
On the bottom 5c of the excitation member 5, a magnet M is fixed as a magnetic field generating
means formed of a permanent magnet such as ferrite or a rare earth.
[0032]
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The magnet M is mounted on a mounting portion 51 formed in the center of the excitation
member 5 in a laterally elongated shape as shown in FIG.
On the magnet M, a yoke 6 formed of a magnetic material is overlapped and fixed.
The yoke 6 is formed to have the same area as the upper surface of the magnet M, and is formed
to have a thickness such that the yoke 6 does not contact the back surface of the diaphragm 2
when the yoke 6 and the magnet M overlap each other.
[0033]
On the other hand, a coil C is provided on the surface (rear surface) opposite to the excitation
member 5 in the diaphragm 2.
The coil C is wound in a rectangular tube shape with a coated copper wire or the like to be
elongated in the lateral direction, and fixed to the central portion in the longitudinal direction of
the back surface of the diaphragm 2 with an adhesive or the like as shown in FIG. It is done. The
coil C has a pair of longitudinal current paths Ca and Ca extending in the longitudinal direction
and a pair of lateral current paths Cb and Cb extending in the lateral direction.
[0034]
The magnet M and the yoke 6 are made to penetrate into the space formed by the longitudinal
current paths Ca and Ca of the coil C and the lateral current paths Cb and Cb, and the both side
connection portions 5a and 5a of the excitation member 5 are diaphragms. Fix it on the back of
2. At this time, as shown in FIG. 5, gaps G and G with minute intervals between the bending
portions 5 e and 5 e formed on the side surfaces on the Y 1 and Y 2 sides of the mounting
portion 51 and the magnet M and the yoke 6. And the lateral current paths Cb and Cb of the coil
C are located in the gaps G and G, respectively. That is, the bent portions 5e, 5e function as
opposing yokes.
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[0035]
When the Z1 side of the magnet M is magnetized to the N pole and the Z2 side is magnetized to
the S pole, a dotted line passing through the magnet M, the yoke 6, the gap G, the bent portion
5e of the mounting portion 51 and the bottom 5c A magnetic path shown is formed. Therefore,
by energizing the lateral current path Cb on the Y1 side of the coil C toward the back side (X1
side) in the drawing, the reverse lateral current path Cb on the Y2 side is reversed to the above
(X2 side). Current flows, and a magnetic driving force that causes the excitation member 5 to
bend and deform in the Z2 direction acts. Further, by energizing in the opposite direction to the
above, a magnetic driving force that causes the excitation member 5 to bend and deform in the
Z1 direction acts. The excitation member 5 is vibrated in the Z1-Z2 direction by the magnetic
driving force. Then, by vibrating the excitation member 5 in the Z1-Z2 direction, the diaphragm 2
simultaneously vibrates in the Z1-Z2 direction.
[0036]
As the vibration generating means 3, the magnet M and the yoke 6 may be provided on the
diaphragm 2 side, and the coil C may be provided on the excitation member 5 side.
[0037]
In the present invention, when the coil C is energized, a magnetic driving force acts, and the
diaphragm 2 and the excitation member 5 vibrate so as to approach each other and to separate
each other.
The diaphragm 2 has low flexural rigidity, and both end portions extending in the longitudinal
direction are connected to the connecting portions 5 a and 5 a of the excitation member 5. For
this reason, the diaphragm 2 can vibrate in the Z1-Z2 direction with large amplitude so that the
center is bent with the connecting portions 5a and 5a as supporting portions. Although the
excitation member 5 also vibrates, its amplitude is sufficiently smaller than the amplitude of the
diaphragm 2.
[0038]
As shown in FIG. 4, in the diaphragm 2, an intermediate portion between the connection portions
5 a and 5 a is fixedly supported on the back surface of the panel 20 via the transmission member
4.
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[0039]
The transmission member 4 is formed of a synthetic resin material such as polycarbonate,
acrylic, or PET, and as shown in FIG. 2, the longitudinal length dimension is an elongated shape
longer than the width dimension in the transverse direction, and vibration is generated. It is a
shape having an area sufficiently smaller than the vibrating surface 2 a facing in the Z1 direction
of the plate 2.
Then, it is fixed to the central portion in the longitudinal direction of the diaphragm 2 with an
adhesive or the like. Thus, the transmission member 4 is fixed to a part of the vibration surface 2
a of the diaphragm 2, and as shown in FIG. 4, the transmission member 4 is fixed to both sides in
the longitudinal direction of the transmission member 4. Non-connected parts 2b, 2b are formed
respectively.
[0040]
An air space Q is provided between the transfer member 4 and the panel 20. The air layer Q is
composed of a plate 8a and spacers 8b and 8b. The plate 8a is formed of a synthetic resin and
has a shape longer than the longitudinal dimension of the transmission member 4 and shorter
than the longitudinal dimension of the diaphragm 2, and the longitudinal central portion of the
transmission member 4 and the longitudinal direction of the plate 8a It is piled up and adhesively
fixed so that the central part of direction may be in agreement. The spacers 8b and 8b are
adhesive layers formed of a double-sided tape or the like having a certain thickness dimension,
and are formed in a square frame shape as shown in FIG. 2 and fixed to the entire peripheral
portion of the plate 8a. The surface on the Z1 side of the spacer 8b is fixed to the panel 20. Thus,
a sealed air layer Q is formed between the panel 20 and the plate member 8a. The diaphragm 2
is adhesively fixed to the plate 8 a via the transmission member 4. Alternatively, the transmission
member 4 may be directly fixed to the panel 20 without providing the air layer Q. Moreover,
although the diaphragm 2 and the transmission member 4 are formed of separate members, the
diaphragm 2 and the transmission member 4 may be integrally formed.
[0041]
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As shown in FIG. 1, the same speaker 1 of the present invention is disposed at the edge on the
short side of the panel 20 in the X1 direction. In addition, as shown in FIG. 4, the panel 20 is
provided in the opening part 23 formed in the housing | casing 21 which has the baseplate 21a
and the side plate 21b. The side plates 21b of the housing 21 are formed with supporting
portions 21c, 21c that project inward on the entire inner wall thereof, and the dampers 22, 22
are fixed along the supporting portions 21c, 21c. The peripheral portion of the panel 20 is
elastically supported.
[0042]
Next, the operation of the speaker 1 of the present invention will be described. In the speaker 1
of the present invention, when the coil C is energized based on an audio signal or the like, the
longitudinal current paths Ca and Ca of the coil C, the magnetic field crossing the lateral current
paths Cb and Cb, and the energized current The excitation member 5 and the diaphragm 2 are
vibrated in the Z1-Z2 direction as illustrated in FIG. In addition, since only the central portion of
diaphragm 2 is partially fixed to panel 20, vibration at non-connected portions 2b and 2b of
diaphragm 2 that is not fixed to panel 20 causes vibration of excitation member 5 The
diaphragm 2 is vibrated with a large amplitude as it is amplified by the operation. Further, since
the diaphragm 2 is fixed to the plate 8 a via the transmission member 4, the vibration of the
diaphragm 2 is not excessively restrained. Furthermore, the amplitude of the diaphragm 2 is
reliably transmitted to the plate 8 a and the panel 20 via the transmission member 4.
[0043]
In the present invention, as shown in FIG. 3, the longitudinal direction of the elongated magnet
M, the yoke 6 and the coil C is orthogonal to the direction (Y1-Y2 direction in the drawing) of the
connecting portions 5a and 5a of the excitation member 5. It is arrange | positioned in the
direction (illustration X1-X2 direction). Therefore, in the conventional loudspeaker shown in FIG.
10, the distance L2 between the connecting portion 5a of the excitation member 5 and the lateral
current path Cb of the coil C to which the magnetic driving force acts is shown in FIGS. It can be
longer than L1. As a result, compared to the conventional case, the resonant frequency of the
diaphragm 2 can be lowered, and the amplitude of the vibration of the diaphragm 2 in the low
frequency band can be increased. Therefore, the amplitude of the vibration of the panel 20
transmitted from the diaphragm 2 in the low frequency band also increases, and the panel 20
can exhibit a large volume. That is, the sound pressure of the sound emitted from the panel 20
can be increased.
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[0044]
6 is a plan view similar to FIG. 3 showing a speaker according to a modification of the present
invention, FIG. 7 is a cross-sectional view similar to FIG. 4 taken along line VII-VII in FIG. It is a
graph which shows the comparison of the characteristic of the frequency band with the
conventional form. In addition, in FIG. 6, the diaphragm etc. which are provided in Z1 side rather
than a coil are abbreviate | omitted. Moreover, the part shown by a dotted line in FIG. 7 is a part
seen through when viewed from the arrow direction of the VII-VII line in FIG.
[0045]
In the speaker 1A of this modification, a holding frame 500 for mounting the horizontally
extending yoke 6 and magnet M formed in an elongated shape is provided, and the X1 side of the
holding frame 500 extends in the vertical direction. The second excitation member 502 is
provided on the X2 side. The both end portions of the first excitation member 501 and the
second excitation member 502 which are directed in the longitudinal direction are connection
portions connected to the back surface of the diaphragm 200, and as shown in FIG. The length
dimension in the direction (Y1-Y2 direction in the drawing) of each side end is longer than the
length dimension in the direction (Y1-Y2 direction in the drawing) of the both-side end of the
second excitation member 502.
[0046]
On the back surface of the diaphragm 200 shown in FIG. 7, a rectangular coil-shaped elongated
coil C extending in the lateral direction is provided. The diaphragm 200 includes a holding frame
500, a first excitation member 501, and the like. The connection portion between the first
excitation member 501 and the second excitation member 502 is fixed to the back surface of the
diaphragm 200 with an adhesive or the like. Then, the diaphragm 200 is fixed to the panel 20 via
the transmission member 4 and the like.
[0047]
In the embodiment shown in FIGS. 6 and 7, the excitation members 501 and 502 have different
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lengths in the direction (Y1-Y2 direction in the drawing) of the both side end portions
(connection portions), and each excitation member 501 and 502 has both sides. The magnet M,
the coil C, and the longitudinal direction of the yoke 6 are both ends of the respective excitation
members 501 and 502 while being disposed at predetermined intervals in a direction (direction
X1 to X2 in the drawing) orthogonal to the direction of the end. The excitation members 501 and
502 are disposed in a direction (direction X1-X2 in the drawing) orthogonal to the direction of
the part. The other structure of the speaker 1A is the same as that of the speaker 1 as shown in
FIG.
[0048]
In the speaker 1A structured as described above, the first excitation member 501, the second
excitation member 502, and the diaphragm 200 are vibrated by the same drive principle as the
speaker 1, and the panel 20 is vibrated.
[0049]
In the present variation, the diaphragm 200 is vibrated together with both the first excitation
member 501 and the second excitation member 502.
The first excitation member 501 and the second excitation member 502 have different resonance
frequencies because the distance between the connecting portion and the coil C in the Y1-Y2
direction is different. Therefore, the vibration of the diaphragm 200 is a vibration in which the
vibration having the resonance frequency of the first excitation member 501 and the vibration
having the resonance frequency of the second excitation member 502 are superimposed, and as
a result, the vibration of the panel 20 Also, the vibration having the resonance frequency of the
first excitation member 501 and the vibration having the resonance frequency of the second
excitation member 502 are superimposed.
[0050]
FIG. 8 is a graph comparing the conventional speaker shown in FIG. 9 and FIG. 10 with the
speaker of this modification in the relationship between the frequency (hertz) and the sound
pressure level (SPL) (decibel). is there. In FIG. 8, a graph indicated by a dotted line is a graph of
the speaker of the present modification, and a graph indicated by a solid line is a graph of the
conventional speaker.
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[0051]
As shown in FIG. 8, in the conventional speaker, the sound pressure drops in a low frequency
band lower than 1000 Hz, particularly in the vicinity of 400 to 500 Hz.
[0052]
On the other hand, in the present modification, there is no drop in sound pressure near 400 to
500 Hz.
In this modification, the vibration of the panel 20 is not only the vibration having the resonance
frequency of the first excitation member 501 but also the vibration having the resonance
frequency of the second excitation member 502 superimposed. This is because the resonance
frequency of the second excitation member 502 is around 500 Hz. For this reason, in the vicinity
of 400 to 500 Hz where the sound pressure has fallen in the conventional speaker, the value is
close to the resonance frequency of the second excitation member 502, so the amplitude of the
vibration of the second excitation member 502 becomes large. Therefore, the diaphragm 200 is
vibrated mainly at the amplitude of the vibration of the second excitation member 502, and as a
result, the panel 20 is also reliably vibrated at a predetermined amplitude, and the sound
pressure of the sound emitted from the panel 20 is Depression is prevented.
[0053]
In the speakers 1 and 1A of the present invention, the panel 20 has a transparent color, and the
FPD formed of liquid crystal or the like is disposed at the center of the panel 20 to drive the
speakers 1 and 1A based on the screen displayed on the FPD. It may be made to be pronounced
from the panel 20.
[0054]
Further, the sounding member on which the speakers 1 and 1A are mounted is not limited to the
panel 20, and a vibrating member disposed inside the housing of the electronic device or the
housing itself of the electronic device can be used as a sounding member It can be used as
[0055]
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Further, the panel 20, the diaphragm 2, 200, and the transmission member 4 are not limited to
the same material but may be formed by combining different materials, and the frequency
characteristics can be changed by changing these combinations. it can.
For example, the diaphragm 2 200 can be formed of a metal plate.
[0056]
FIG. 2 is a perspective plan view of the electronic device equipped with the loudspeaker of the
present invention as viewed from the panel surface side, an exploded perspective view of the
loudspeaker of the present invention, a partial plan view of the loudspeaker of FIG. 3. A sectional
view, a sectional view cut along the line V-V in FIG. 3, a plan view similar to FIG. 3, showing a
loudspeaker according to a modification of the present invention, a section similar to FIG. 4 along
the line VII-VII in FIG. FIG. 9 is a cross-sectional view, a graph showing a comparison of the
characteristics of the frequency band between the present modification and the conventional
embodiment, a perspective plan view of the electronic device equipped with the conventional
speaker viewed from the surface side of the panel, and the I-I line in FIG. Sectional view of
Explanation of sign
[0057]
1, 1A Speaker 2, 200 Diaphragm 2b Non-connecting part 3 Vibration generating means 4
Transmission member 5 Excitation member 5a Connecting part 6 Yoke 20 Panel 51 Holding part
500 Holding frame 501 First excitation member 502 Second excitation member C coil Cb lateral
current path G gap M magnet
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