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JP2002209297

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
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DESCRIPTION JP2002209297
[0001]
TECHNICAL FIELD The present invention relates to a panel type speaker device.
[0002]
2. Description of the Related Art As shown in FIG. 9, a conventional panel-type speaker device
includes an exciter 101 having a coil 129 and a magnet 131 for generating vibrations in the
audio frequency band, and a flat plate material having high mechanical rigidity. A diaphragm
102, a rubber sponge 103 joined to the rear end surface 122 of the exciter 101, a resin
enclosure 106 for accommodating the exciter 101, the diaphragm 102, the rubber sponge 103,
an amplifier substrate (not shown), etc. And a frame 108 made of resin for holding the peripheral
edge of the diaphragm 102. The exciter 101 has a drive surface 121 for transmitting vibrations
in the audio frequency band to the diaphragm 102, a rear end surface 122 to which the rubber
sponge 103 is joined, a bobbin 128, and a coil 129 wound around the bobbin 128. The magnet
131, the yoke 132, and the inner damper 130 for coupling the bobbin 128 and the yoke 132 are
provided. The diaphragm 102 has a driven surface 125 joined to the drive surface 121 of the
exciter 101, and a sound emitting surface 124 for generating an acoustic wave in the medium.
[0003]
The operation of the conventional panel-type speaker device 100 configured as described above
will be described.
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[0004]
In FIG. 9, the exciter 101 generates a vibration, the drive surface 121 transmits the vibration to
the diaphragm 102, and the diaphragm 102 vibrates.
Here, when vibration having a large amplitude is instantaneously transmitted to the diaphragm
102, a repulsive force is generated on the diaphragm 102, and the diaphragm 102 is shaken
back in the direction of the exciter 101.
[0005]
The role of the rubber sponge 103 when such a repulsive force is generated on the diaphragm
101 will be described. Without the rubber sponge 103, as shown in FIG. 10, when the repulsive
force of the diaphragm 102 is generated in the direction indicated by the arrow F, the repulsive
force is transmitted from the diaphragm 102 to the exciter 101, and the bobbin 128 of the
exciter 101 is Swings in the direction of the yoke 132. The swing back amount at this time is
shown as A. In FIG. 10, since the yoke 132 is fixed by the enclosure 106, the bobbin 128 abuts
on the yoke 132 and a collision sound is generated.
[0006]
When the rubber sponge 103 is present as shown in FIG. 9, the repulsive force transmitted from
the bobbin 128 to the yoke 132 via the inner damper 130 is absorbed by the rubber sponge
103, and even if the amount of swinging back exceeds A. Since the yoke 132 swings in the
direction of the enclosure 106, the bobbin 128 does not bottom-contact the yoke 132.
[0007]
However, in such a conventional panel-type speaker device, the magnet 131 and the yoke 132
are inclined by their own weight as shown in FIG. As a result, the coil 129 wound around the
bobbin 128 comes in contact with the yoke 132.
Therefore, the surface of the coil 129 is abraded and broken, and the sound quality is degraded
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or no sound is produced. Further, in the conventional panel type speaker device, there is a
problem that the rubber sponge 103 is peeled off from the enclosure 106 and the sound quality
is deteriorated. In addition, there is a problem that the sound quality is deteriorated by the
temporal change of the rubber sponge 103.
[0008]
The present invention has been made to solve such a problem, and provides a panel type speaker
device having a long product life without deterioration of sound quality.
[0009]
A damper according to the present invention comprises a vibration generating member for
generating vibration in an audio frequency band, a diaphragm joined to one end of the vibration
generating member and vibrated by the vibration generating member, A damper for use in a
panel type speaker device comprising a vibration generating member and a housing for
containing the diaphragm, wherein the first fixing portion fixed to the housing and the other end
of the vibration generating member The first fixing portion and the second fixing portion so that
the second fixing portion is fixed to the second fixing portion and the second fixing portion
swings with respect to the first fixing portion in a direction perpendicular to the diaphragm. And
an intermediate portion positioned between the two, and has a configuration formed from a
planar plate material.
With this configuration, this damper is adopted for a panel type speaker, and the bobbin of the
vibration generating member (exciter) does not bottom-contact the yoke to prevent generation of
abnormal noise, and winding around the bobbin It is possible to prevent the coil from coming
into contact with the yoke, thereby preventing the coil from being worn out, preventing
deterioration in sound quality, and providing a panel type speaker device having a long product
life. Become.
[0010]
In the damper of the present invention, the intermediate portion has a width greater than a plate
thickness. With this configuration, this damper is adopted for a panel type speaker, and the rear
end face swings in the direction perpendicular to the rear end face of the vibration generating
member (exciter), and the rear end face swings in the direction other than the direction
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perpendicular to the rear end face. It is possible to provide a panel type speaker device which can
be made difficult to move and whose sound quality is not deteriorated.
[0011]
In the damper of the present invention, the intermediate portion is at least one annular portion
positioned intermediate the first fixed portion and the second fixed portion, the first fixed
portion, the annular portion, and the second fixed portion. And a plurality of connecting portions
for connecting the plurality of connecting portions, and each of the connecting portions has a
configuration arranged symmetrically with respect to the axial center of the annular portion.
With this configuration, this damper is adopted for a panel type speaker, the rear end face swings
in a direction perpendicular to the rear end face of the vibration generating member (exciter),
and the rear end face swings in a direction other than the direction perpendicular to the rear end
face. It is possible to provide a panel-type speaker device which can be made difficult to move
and whose sound quality is not further deteriorated even when used in an inclined state.
[0012]
In the damper of the present invention, the plurality of connecting portions have a configuration
in which the connecting portions located on the circumference adjacent to each other are
arranged so as to be shifted by a predetermined angle in the circumferential direction. With this
configuration, this damper is adopted for a panel type speaker, the rear end face swings in a
direction perpendicular to the rear end face of the vibration generating member (exciter), and the
rear end face swings in a direction other than the direction perpendicular to the rear end face. It
is possible to provide a panel-type speaker device which can be made difficult to move, the
strength of the intermediate portion is improved, and the sound quality is not deteriorated.
[0013]
In the damper of the present invention, the plurality of connecting portions have a configuration
in which the connecting portions located on the same circumference are arranged at equal
angular intervals in the circumferential direction. With this configuration, this damper is adopted
for a panel type speaker, and the rear end face swings in the direction perpendicular to the rear
end face of the vibration generating member (exciter), and the rear end face swings in the
direction other than the direction perpendicular to the rear end face. It is possible to provide a
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panel-type speaker device that can be made difficult to move, can be used in an inclined state, the
strength of the intermediate portion is improved, and the sound quality is not degraded.
[0014]
The damper of the present invention is a damper formed of a single flat plate material, and the
first fixing portion located on the outer periphery, the second fixing portion located on the inner
periphery, the first fixing portion, and the above A plurality of intermediate annular portions
positioned intermediate to the second fixed portion, a first connecting portion connecting the
intermediate annular portion to the first fixed portion at a plurality of equal positions at
predetermined first angles, and A plurality of second connecting portions connecting a plurality
of intermediate annular portions at equal intervals by the first angle at a plurality of locations,
and a second fixing portion at the intermediate annular portion are equally spaced by the first
angles at a plurality of locations The first connection portion, the second connection portion, and
the third connection portion have a third connection portion to be connected, and the connection
portions located on the circumference adjacent to each other have predetermined connection
portions in the circumferential direction. The second annular portion, the first connection
portion, and the second connection portion are disposed with a second angular shift. Both the
width of the preliminary third connecting portion has a structure in which greater than the
thickness. With this configuration, this damper is adopted for a panel type speaker, and the rear
end face swings in the direction perpendicular to the rear end face of the vibration generating
member (exciter), and the rear end face swings in the direction other than the direction
perpendicular to the rear end face. It can be made difficult to move, and the bobbin of the
vibration generating member (exciter) will not hit the bottom of the yoke, so that abnormal noise
will not be generated, and the coil wound around the bobbin will be It is possible to prevent the
coil from being worn without contact, to prevent deterioration of the sound quality, and to
provide a panel type speaker device having a long product life.
[0015]
The damper of the present invention has a configuration in which the first fixing portion has a
mounting hole. With this configuration, the damper can be fixed by a screw or the like, and by
adopting this damper as a panel type speaker, a panel type speaker device having a further
longer product life without deterioration of the sound quality can be provided. It will be possible.
[0016]
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The damper of the present invention has a configuration in which the second fixing portion has a
convex portion for positioning when adhesively fixing to the vibration generating member. With
this configuration, the damper is positioned at the time of bonding and fixing to the rear end face
of the vibration generating member (exciter). By adopting this damper for a panel type speaker,
the sound quality is not further degraded, and the product life is further enhanced. It is possible
to provide a long panel type speaker device.
[0017]
The damper of the present invention has a configuration in which the material of the plate
material is stainless steel. By adopting this damper for a panel type speaker, it is possible to
provide a panel type speaker device having a longer product life without deterioration of the
sound quality.
[0018]
The damper of the present invention has a configuration in which a damping material made of a
material having elasticity is filled in a notch formed between the first fixing portion and the
second fixing portion. By adopting this damper for a panel type speaker, it is possible to provide
a panel type speaker device in which no abnormal sound due to resonance is generated, such
that resonance having a high index Q (indicating the sharpness of resonance) does not occur. .
[0019]
In the damper of the present invention, the damping material is a silicon rubber. With this
configuration, since silicon rubber has good thermal stability, this damper is adopted for a panel
type speaker to prevent occurrence of abnormal noise due to resonance with a high index Q, a
panel type speaker having no change due to temperature An apparatus can be provided.
[0020]
BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be
described below with reference to the drawings.
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[0021]
First Embodiment FIG. 1 is an exploded perspective view showing a panel-type speaker device
according to a first embodiment of the present invention, and FIG. 2 is a cross-sectional view
showing the panel-type speaker device according to the first embodiment of the present
invention. 3 is a plan view showing the back damper according to the first embodiment of the
present invention, and FIG. 4 is a cross-sectional view taken along the line X-X showing the back
damper according to the first embodiment of the present invention.
[0022]
In FIG. 1, a panel type speaker device 200 has a coil and a magnet, and consists of an exciter 201
(vibration generating member) that generates vibration in an audio frequency band and a flat
plate having high mechanical rigidity. It includes a diaphragm 202 joined to one end and
vibrated by exciter 201, a back damper 203 (holding member) joined to the other end of exciter
201 to hold exciter 201, an amplifier for amplifying an audio signal, and an input / output
interface. The amplifier substrate 205 held on the operation panel 204 at the input / output
terminal side, an enclosure 206 (housing) for accommodating the exciter 201, the diaphragm
202, the back damper 203, the amplifier substrate 205, etc., the back damper 203 and the
enclosure 206 And the back damper 203 The back damper fixing spacer 207 detachably coupled
to down the closure 206, and a frame 208 which is fitted to the enclosure 206 to hold the
peripheral edge of the diaphragm 202.
[0023]
The back damper 203 is formed of a single flat plate material, and as shown in FIGS. 3 and 4, the
back damper 203 is positioned on the inner periphery of an annular outer annular portion (first
fixing portion) 10 located on the outer periphery First and second intermediate annular portions
11 and 12 located between the outer annular portion 10 and the inner annular portion 20, and
an outer annular portion 10, first connecting portions 31a, 31b, 31c, 31d connecting the first
intermediate annular portion 11 and second connecting portions 32a, 32b, 32c, connecting the
second intermediate annular portion 12 to the first intermediate annular portion 11. 32 d and
third connecting portions 33 a, 33 b, 33 c, 33 d connecting the inner annular portion 20 to the
second intermediate annular portion 12.
[0024]
The outer annular portion 10, the first intermediate annular portion 11, the second intermediate
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annular portion 12, and the inner annular portion 20 have the same axial center 40.
The shape of the back damper 203 is formed symmetrically with respect to the axial center 40,
and the first connecting portions 31a, 31b, 31c, 31d, the second connecting portions 32a, 32b,
32c, 32d, and the third connection are formed. The portions 33a, 33b, 33c, 33d are arranged
symmetrically with respect to the axial center 40.
[0025]
The first connection portions 31a, 31b, 31c, 31d, the second connection portions 32a, 32b, 32c,
32d, and the third connection portions 33a, 33b, 33c, 33d are equally distributed at
predetermined angles in the circumferential direction, respectively. It is arranged by.
That is, the connecting portions located on the same circumference are equally spaced by a
predetermined angle in the circumferential direction.
Specifically, the first connecting portions 31a, 31b, 31c, and 31d connect the first intermediate
annular portion 11 to the outer annular portion 10 at four equal intervals of 90 degrees, and the
second connecting portions 32a, 32b, and 32c. , 32d connect the second intermediate annular
portion 12 to the first intermediate annular portion 11 at four equal intervals of 90 degrees, and
the third connecting portions 33a, 33b, 33c, 33d are connected to the second intermediate
annular portion 12 The annular portions 20 are connected at four equal intervals of 90 degrees.
[0026]
In addition, the first connecting portions 31a, 31b, 31c, 31d and the second connecting portions
32a, 32b, 32c, 32d are arranged by being shifted by a predetermined angle in the
circumferential direction, and the second connecting portions 32a, 32b, 32c, 32d and The third
connecting portions 33a, 33b, 33c, and 33d are disposed so as to be shifted by a predetermined
angle in the circumferential direction.
That is, the connecting portions located on the circumference adjacent to each other are
arranged to be shifted by a predetermined angle in the circumferential direction. Specifically, the
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first connecting portions 31a, 31b, 31c, 31d and the second connecting portions 32a, 32b, 32c,
32d are arranged mutually offset by 45 degrees in the circumferential direction, and the second
connecting portions 32a, 32b, 32b, 32c, 32d and the third connecting portions 33a, 33b, 33c,
33d are arranged mutually offset by 45 degrees in the circumferential direction.
[0027]
The material of the plate material of the back damper 203 is stainless steel. As stainless steel,
preferably, SUS301 is used. When the plate thickness was 0.1 mm and SUS301 was used as
stainless steel, the back damper 203 moved favorably in the direction perpendicular to the
surface. The stainless steel may be, for example, SUS304, in addition to SUS301. In the case of
using a hard stainless steel than SUS301, the plate thickness is made thinner. Alternatively, a
plate material called spring steel (Si-Mn steel, Cr-Mn steel, Si-Mn-Cr steel, etc.) may be used as a
plate material of the back damper 203, but in general, the spring steel is easily rusted. When
using spring steel, the surface of the spring steel is plated.
[0028]
The back damper 203 has a width W1 of the first intermediate annular portion 11, a width W2
of the second intermediate annular portion, a width W3 of the first connecting portions 31a to
31d, and a width W4 of the second connecting portions 32a to 32d. And the width W5 of the
third connecting portions 33a to 33d are all larger than the plate thickness. Specifically, for
example, SUS301 is used as stainless steel, the plate thickness is about 0.1 mm, and the widths
W1, W2, W3, W4, and W5 are all 1.0 mm or more.
[0029]
The back damper 203 is a single flat plate member and includes a plurality of arc-shaped notches
41 a, 41 b, 41 c, 41 d, 42 a, 42 b, 42 c, 42 d between the outer annular portion 10 and the inner
annular portion 20. , 43a, 43b, 43c, 43d. The first intermediate annular portion 11, the second
intermediate annular portion 12, the first connecting portions 31a, 31b, 31c, 31d, and the
second connecting portions 32a, 32b, which are provided by forming these notches. An
intermediate portion having 32c, 32d and third connection portions 33a, 33b, 33c, 33d is
deformed such that the inner annular portion 20 swings in the direction perpendicular to the
surface with respect to the outer annular portion 10. That is, the back damper 203 has elasticity
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in the direction perpendicular to the surface. On the other hand, the back damper 203 has
rigidity in comparison with the direction perpendicular to the surface except the direction
perpendicular to the surface.
[0030]
Further, in the back damper 203, four circular attachment holes 212a, 212b, 212c and 212d are
provided in the outer annular portion 10 at equal intervals of 90 degrees. These mounting holes
212a, 212b, 212c, 212d are arranged to have the same pitch as the female screw holes 210a,
210b, 210c, 210d of the spacer 207 for back damper fixing of FIG. The outer annulus 10 is
adapted to be fixed relative to the enclosure 206 of FIG. Further, in the back damper 203, four
circular convex portions 44a, 44b, 44c, 44d are provided on the inner annular portion 20 at
equal intervals of 90 degrees. These convex portions 44 a, 44 b, 44 c, 44 d are disposed at the
same positions as the four concave portions provided on the rear end surface of the exciter 201
of FIG. 1, and the inner annular portion 20 with respect to the exciter 201. It is structured to be
positioned and fixed by adhesion. Although the exciter 201 of FIG. 2 has the recess 233 on the
rear end surface 222, the present invention is not limited to this, and the recess is not provided
on the rear end surface of the exciter, and the outermost periphery of the rear end surface of the
exciter The convex portions 44a, 44b, 44c, and 44d of the back damper 203 may be fitted on the
outermost periphery.
[0031]
Thus, in the back damper 203, the outer annular portion 10 is fixed to the enclosure 206, and
the inner annular portion 20 is fixed to the rear end surface of the exciter 201. In addition, the
back damper 203 is configured such that the inner annular portion 20 swings relative to the
outer annular portion 10 in a direction perpendicular to the rear end surface of the exciter 201,
ie, in a direction perpendicular to the diaphragm 202. An intermediate portion between the and
the outer annular portion 10 couples the inner annular portion 20 to the outer annular portion
10.
[0032]
The shape of the back damper 203 is symmetrical with respect to a straight line connecting the
center of the mounting hole 212a and the center of the mounting hole 212c. Further, the shape
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of the back damper 203 is symmetrical with respect to a straight line connecting the center of
the mounting hole 212b and the center of the mounting hole 212d. Further, the back damper
203 is symmetrical in shape with respect to a straight line connecting the center of the convex
portion 44 a and the center of the convex portion 44 c. Further, the shape of the back damper
203 is symmetrical with respect to a straight line connecting the center of the convex portion 44
b and the center of the convex portion 44 d. Thus, the shape of the back damper 203 is
symmetrical with respect to the attachment of the outer annular portion 10 and the adhesive
fixation of the inner annular portion 20.
[0033]
As shown in FIG. 1, the back damper fixing spacer 207 is formed of a disk-like member having a
predetermined thickness, and an opening is formed in the center so as to allow the exciter 201 to
pass through. Four female screw holes 210a, 210b, 210c and 210d are provided at equal
intervals of 90 degrees on the inner peripheral edge of the back damper fixing spacer 207. In
addition, four female screw holes 211a, 211b, 211c and 211d (not shown) are equally
distributed by 90 degrees around the outer periphery of the back damper fixing spacer 207 at
positions shifted by 90 degrees from the female screw holes 210a to 210d. It is provided.
[0034]
At substantially the center of the enclosure 206, a vent hole 213 for heat dissipation of the
exciter 201 is provided. Four circular attachment holes 214a, 214b, 214c and 214d are provided
on the periphery of the vent hole 213 at equal intervals of 90 degrees. The mounting holes 214 a
to 214 d are arranged at the same pitch as the female screw holes 211 a to the female screw
holes 211 d of the back damper fixing spacer 207.
[0035]
Further, eight frame attachment holes 215a, 215b, 215c, 215d, 215e, 215f, 215g, 215h which
are partially not shown are provided at the side center and corner of the enclosure 206
respectively. Further, at the long side of the enclosure 206, four stand insertion ports 216a,
216b, 216c, 216d for attaching the installation stand not shown are provided. In the vicinity of
the corner of the enclosure 206, four hook attachment holes 217a, 217b, 217c, and 217d for
attaching installation hooks (not shown) are provided.
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[0036]
At each of the side center and corner of the frame 208, eight female screw holes 218a, 218b,
218c, 218d and 218e (not shown) are respectively opposed to the frame attachment hole 215a
to the frame attachment hole 215h of the enclosure 206. , 218f, 218g, 218h are provided. The
frame body 208 is coupled to the enclosure 206 by screwing a male screw member (not shown)
from the enclosure 206 side.
[0037]
In FIG. 2, the back damper fixing spacer 207 is in contact with the back damper 203 from the
exciter 201 side, and partially screw male screw members 219a, 219b, 219c, 219d (not shown)
from the back damper 203 side. The back damper 203 is coupled to the back damper 203 by
being coupled. The back damper fixing spacer 207 is adapted to abut against the enclosure 206
from the exciter 201 side, and by screwing male screw members 220 a, 220 b, 220 c, 220 d (not
shown) from the enclosure 206 side. It is adapted to couple with the enclosure 206. As described
above, the back damper fixing spacer 207 is interposed between the back damper 203 and the
enclosure 206, and the back damper 203 is detachably coupled to the enclosure 206.
[0038]
The back damper 203 is adapted to abut against the rear end surface 222 of the exciter 201, and
the recess 233 of the exciter is fitted to the protrusions 44a, 44b, 44c and 44d shown in FIGS. An
inner annular portion 20 shown in FIG. 3 and FIG. 4 is adhesively fixed to the rear end surface
222 of the exciter. Although the exciter 201 of FIG. 2 has the recess 233 on the rear end surface
222, the present invention is not limited to this, and the recess is not provided on the rear end
surface of the exciter, and the outermost periphery of the rear end surface of the exciter The
convex portions 44a, 44b, 44c, and 44d of the back damper 203 may be fitted on the outermost
periphery.
[0039]
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The exciter 201 has a drive surface 221 for transmitting vibrations in the audio frequency band
to the diaphragm 202 and a rear end surface 222 held by the back damper 203. The driving
surface 221 constitutes one end of the exciter 201, and the rear end face 222 constitutes the
other end of the exciter 201. The diaphragm 202 has a driven surface 225 joined to the drive
surface 221 of the exciter 201, and a sound emitting surface 224 for generating an acoustic
wave in the medium.
[0040]
The exciter 201 further includes a bobbin 228, a coil 229 wound around the bobbin 228, a
magnet 231, and a yoke 232. Also, the inner damper 230 couples the bobbin 228 and the yoke
232.
[0041]
Next, the operation of the panel-type speaker device according to the present embodiment will be
described.
[0042]
In FIG. 5, the exciter 201 generates a vibration, the drive surface 221 transmits the vibration to
the diaphragm 202, and the diaphragm 202 vibrates.
Here, when vibration having a large amplitude is instantaneously transmitted to the diaphragm
202, a repulsive force is generated in the diaphragm 202 in the direction indicated by the arrow
F, and the diaphragm 202 is shaken back in the direction of the exciter 201. The swing back
amount at this time is shown as A in FIG. When such a repulsive force is generated on the
diaphragm 201, the repulsive force is transmitted from the diaphragm 202 to the exciter 201,
and the bobbin 228 of the exciter 201 swings in the direction of the yoke 232. Also, the
repulsive force of the diaphragm 202 is transmitted to the yoke 232 via the inner damper 230.
[0043]
In the present embodiment, in the back damper 203, the outer annular portion 10 is fixed to the
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enclosure 206 via the spacer 207, and the inner annular portion 20 is adhesively fixed to the
exciter 201. In addition, the intermediate portion 30 causes the inner annular portion 20 to
swing relative to the outer annular portion 10 in the direction perpendicular to the rear end
surface of the exciter 201 (that is, the direction perpendicular to the diaphragm 202). There is.
Here, the intermediate portion 30 is the first intermediate annular portion 11, the second
intermediate annular portion 12, the first connecting portions 31a, 31b, 31c, 31d, and the
second connecting portions 32a, 32b, 32c, 32d, shown in FIG. And the third connecting portions
33a, 33b, 33c, and 33d.
[0044]
When the repulsive force of the diaphragm 202 is transmitted to the yoke 232, the back damper
203 causes the yoke 232 of the exciter 201 to rock in the direction of the enclosure 206. In the
present embodiment, as shown in FIG. 5, even if the swing back amount of the diaphragm 202 is
A, the yoke 232 moves relative to the rear end face of the exciter 201 by the amount shown by B
in conjunction with this. It swings in the vertical direction. In a conventional panel-type speaker
device that absorbs vibration with a rubber sponge, the swinging direction is not constant, and
the resulting swinging amount of the yoke is always B even if a repulsive force that produces a
swinging amount A is applied to the diaphragm 202 It is difficult to accurately estimate the
amount of rocking of the yoke because the time-dependent change of the rubber sponge which
plays the role of the damper is also large. However, the swing back direction is restricted by the
shape of the back damper 203 described above, and the change with time of the rigidity of the
back damper 203 is small by forming the back damper 203 of stainless steel, so the momentum
of the yoke 232 (FIG. B) is stable, thereby making the rigidity design of the back damper 232
such that the swing amount B does not cause the bobbin 228 to bottom-contact the yoke even if
a large amplitude vibration is instantaneously transferred to the diaphragm By optimizing, it is
possible to adjust so as not to generate abnormal noise and to prevent deterioration of the sound
quality.
[0045]
Further, since the yoke 232 of the exciter 201 swings substantially perpendicularly to the
diaphragm 202 depending on the shape and the material of the back damper 203, the coil 229
wound around the bobbin 228 does not contact the yoke 232, It is possible to prevent the
breakage of the coil and to improve the product life.
[0046]
Further, in the present embodiment, the outer annular portion 10 has a mounting hole and is
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fixed by a screw, so that the mounting strength can be increased and deterioration of the sound
quality can be prevented. It will be possible.
[0047]
Further, in the present embodiment, since the back damper 203 is formed of a single flat plate
material, there is no change with time as compared with a conventional rubber sponge, and
deterioration of sound quality can be prevented.
[0048]
Second Embodiment FIG. 6 is a cross-sectional view of an essential part showing a panel type
speaker apparatus according to a second embodiment of the present invention, FIG. 7 is a plan
view showing a back damper according to a second embodiment of the present invention, and
FIG. It is YY sectional drawing which shows the back damper of 2nd Embodiment of invention.
In FIGS. 6, 7 and 8 showing the second embodiment of the present invention, the same
components as those in FIGS. 2, 3 and 4 showing the first embodiment of the present invention
are assigned the same reference numerals. Since these components have been described in the
first embodiment, the description will be omitted.
[0049]
The damper 303 of this embodiment differs from the damper 203 of the first embodiment as
shown in FIG. 7 and FIG. 8 in that notches 41a, 41b, 41c, 41d, 42a, 42b, 42c, 42d, 43a, 43b ,
43c, 43d are filled with silicone rubber 350 (damping material).
The silicone rubber 350 is filled in the notch from one surface of the back damper 303 to form a
film.
Further, as shown in FIG. 6 and FIG. 8, the silicone rubber 350 is packed so as not to protrude on
the other surface (surface on the exciter 201 side) of the back damper 303.
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[0050]
Since the back damper 303 of the present embodiment is thus filled with the silicone rubber 350
in the notch portion to form a film, when the exciter 201 generates a vibration, the index Q
(resonance of It is possible to prevent the occurrence of high resonances). Therefore, abnormal
noise (buzzing noise) generated due to the resonance of the back damper 303 does not occur.
[0051]
In this embodiment, silicone rubber is preferably used as a damping material to be filled in the
notched portion, from the viewpoint of no harm to human body and good thermal stability.
However, the present invention is not limited to this, and for example, butyl rubber may be used
as the vibration damping material filled in the notch portion, and a rubber vibration material
having elasticity is used. In addition, it is preferable to select a material with good workability
when manufacturing the damping material, for example, a material such as silicone rubber that
can be applied to the notch to fill the notch. Choose
[0052]
The present invention can provide an excellent panel type speaker device without deterioration
of sound quality.
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