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JP2007124005

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
financial decisions, should not be based on machine-translation output.
DESCRIPTION JP2007124005
The present invention provides a wood panel which is high in performance, does not require an
installation space, is excellent in reproduction of ambience sound without a listener being aware
of a sound source, and can easily change a sound field. An acoustic panel (wood panel) 100
comprises a wood board 1 provided with an acoustic drive unit (drive body) 5, and one of the
front and back surfaces of the wood board 1 is a drive of the acoustic drive unit 5. Is a vibrating
surface that vibrates directly. [Selected figure] Figure 3
Wood panel
[0001]
The present invention relates to woody panels.
[0002]
Conventionally, as a speaker apparatus mainly used as a surround speaker, one having a speaker
unit attached to a rectangular parallelepiped cabinet is usually used.
Further, as another shape, it is known that the cabinet is made thin and plate-like, and a stand is
provided at the lower part to support the cabinet, or the wall is hung. In addition, a vibrating
membrane is stretched on a rectangular support frame, and a pair of flat speakers are configured
to vibrate and drive the vibrating membrane by a vibrator supported by the support frame, and
the upper sides of these flat speakers are connected There is known a speaker device which is
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made to stand on its own in a mounting posture in which both are skewed with each other in a
bowl shape (see, for example, Patent Document 1). In addition, since the listener may be aware of
the sound source by seeing the speaker from the appearance and may interfere with feeling as a
psychologically natural ambience sound, the speaker may be covered by a net, a grid, a
perforated plate, etc. It is common to hide the speakers by providing JP 2001-148893 A
[0003]
However, when a rectangular parallelepiped cabinet is used, an installation space for installing
the speaker device is required, and in a relatively narrow room, the distance between the listener
and the speaker can be appropriately taken and the user can listen comfortably There is a
problem that the space will be narrowed further. In addition, it has been difficult to obtain
sufficient performance particularly in frequency characteristics at low frequencies and high
sound pressure in the case where the cabinet is made thin or plate-like. In addition, since the
speaker apparatus to which the speaker unit is attached has a relatively small sound source, the
position of the sound source is fixed in terms of hearing, and it is unsuitable for a surround
speaker mainly used for reproducing atmospheric sound. In addition, when a cover such as a net,
a lattice, or a perforated plate is provided to hide the speaker, a slight change in sound quality
can not be avoided. Furthermore, since the diffusion angle of sound can not be easily changed
according to the installation location of the speaker or the distance to the listener, it is difficult to
adjust the indoor sound field.
[0004]
The present invention has been made in view of the above circumstances, is high performance
and does not require an installation space, and is excellent for reproducing ambient sound
without the listener being aware of the sound source, and easily changing the sound field. The
purpose is to provide a wood panel that can be
[0005]
In order to solve the above problems, according to the invention of claim 1, a driving body is
provided on a wood plate material, and one of the front and back surfaces of the wood plate
material is a vibrating surface that is directly vibrated by the driving of the driving body. It is
characterized by
[0006]
The invention according to claim 2 is characterized in that, in the wood panel according to claim
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1, the driving body is disposed within the thickness of the wood plate material.
[0007]
The invention according to claim 3 is the wood panel according to claim 1 or 2, wherein the
vibration surface is made of a first member having a higher acoustic reflectivity than the surface
on the opposite side of the vibration surface, and the surface on the opposite side. Is
characterized by comprising a second member having a sound absorption coefficient higher than
that of the vibration surface.
[0008]
The invention according to claim 4 is that, in the wood panel according to claim 3, a plurality of
first members are provided adjacent to each other on one second member, and the first members
adjacent to each other are separated. As a center, it is characterized in that it can be bent so that
the front surfaces or the back surfaces of the wood plate members face each other.
[0009]
The invention according to claim 5 is characterized in that, in the wood panel according to claim
4, the driving body is disposed in the vicinity of the folding central portion.
[0010]
The invention according to claim 6 is characterized in that, in the wood panel according to any
one of claims 3 to 5, the entire surface of the vibration surface is integrally formed by a single
piece of the first member. .
[0011]
The invention according to claim 7 is characterized in that in the wood panel according to claim
6, a plywood is attached to at least a part of the inner surface of the first member.
[0012]
The invention according to claim 8 is characterized in that, in the wood panel according to claim
6 or 7, tension is applied by fixing the outer periphery of the first member to the second member
side.
[0013]
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The invention according to claim 9 is characterized in that the wood panel according to any one
of claims 1 to 8 is used as a surround speaker.
[0014]
According to the present invention, since one of the front and back surfaces of the wood plate is
a vibrating surface directly vibrated by the drive of the driving member, sound is emitted from
the vibrating surface to function as a high-performance speaker.
In addition, it is thin and does not take up an installation space, and the listener is very good at
reproducing the ambience sound without being aware of the sound source.
Furthermore, the sound field can be easily changed.
[0015]
Hereinafter, embodiments of the present invention will be described with reference to the
drawings.
FIG. 1 is a perspective view of the acoustic panel 100 according to the present invention as
viewed from the front side, and FIG. 2 is a perspective view of the acoustic panel 100 as viewed
from the back side.
FIG. 3 is a plan sectional view of the acoustic panel 100. As shown in FIG.
The acoustic panel (wood panel) 100 is a panel that can be used as a surround speaker, for
example, when it is installed in a room such as a small hall or a home and the AV device is
reproduced.
The acoustic panel 100 is provided with an acoustic drive unit (drive body) 5 having a magnetic
circuit 51 and a voice coil 52 on a wood plate 1, and the surface of the front and back of the
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wood plate 1 is acoustically driven. The vibration surface is directly vibrated by the drive of the
unit 5.
The wood plate 1 includes two plate bodies 2 and 2 and a second member 3 provided on the
back surface of the plate bodies 2.
[0016]
FIG. 4 is a front view of a frame 23 formed by assembling the vertical beam 21 and the
horizontal beam 22 longitudinally and laterally, and FIG. 5 is a plan sectional view of the acoustic
panel 100 on the side provided with the acoustic drive unit 5. .
In the plate member body 2, the surface member (first member) 24 is attached to the surface of
the frame 23 formed by assembling the vertical beam 21 and the horizontal beam 22
longitudinally and laterally, and the back surface 25 is attached to the back surface of the frame
23. It is attached and configured.
The vertical bars 21 and the horizontal bars 22 are wood members having a cross section of 50
mm × 25 mm.
The surface material 24 is made of plywood with a thickness of about 3 mm, has a rectangular
plate shape substantially the same size as the surface of the frame 23, and is adhered and fixed
to the surface of the frame 23. The back surface member 25 is made of plywood with a thickness
of about 9 mm, and has a rectangular plate shape substantially the same size as the back surface
of the frame 23 and is adhered and fixed to the back surface of the frame 23. And the back
surface member 25 are disposed to face each other in parallel. As described above, since the
back surface material 25 is thicker than the surface material 24, its bending rigidity and mass are
very large compared to the surface material 24, and is sufficient when the magnetic circuit 51 of
the acoustic drive unit 5 described later is attached. Stiffness is obtained. On the other hand,
although the surface material 24 has a thickness of about 3 mm, it has a strength necessary for
use against external force, and abnormal noise at the time of vibration when the voice coil 52 of
the acoustic drive unit 5 is attached. There are few misalignments and inclinations that cause
breakage, and because they are wood fibers, the internal loss and the divided vibration
characteristics, etc. are relatively suitable for speakers in terms of vibration characteristics. In a
state where the two plate members 2 and 2 configured as described above are disposed adjacent
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to each other in the left-right direction of the plate member 2, the respective back members 25
and 25 are abutted against the second member 3 and fixed. It is done.
[0017]
The second member 3 is formed of a flexible member having a thickness of about 8 mm, for
example, a fibrous surface material such as a carpet or a porous surface material. Therefore, the
second member 3 has a sound absorption coefficient higher than that of the surface material 24,
and the surface material 24 has a sound reflectance higher than that of the second member 3.
The back members 25, 25 are in contact with the second member 3 in a state in which the two
plate members 2, 2 are separated such that the distance S1 (see FIG. 3) between the side end
faces adjacent to each other is about 15 mm. It is arranged to touch. Then, on the left and right
side end faces 3a, 3a of the second member 3, reinforcing members 41, 41 having a substantially
L shape in plan view are respectively disposed along the upper and lower sides so as to cover the
side end faces 3a, 3a. A screw N is screwed toward one side end 2a, 2a (specifically, the back
surface member 25 and the vertical crosspiece 21) of each of the plate members 2, 2. Further,
reinforcing members 42, 42 having a rectangular shape in plan view are substantially at the
center in the left-right direction of the second member 3 and at positions corresponding to the
other side ends 2b, 2b of the plate members 2, 2. Screws N and N are screwed toward the other
side ends 2b and 2b (specifically, the back surface member 25 and the longitudinal members 21)
of the plate members 2 and 2 respectively disposed along the upper and lower sides. . That is,
only the second member 3 is provided between the other side ends 2b and 2b of the plate bodies
2 and 2 adjacent to each other, and the plate body 2 is centered on the space between the other
side ends 2b and 2b. , 2 (surface members 24, 24) or second members 3, 3 are foldable to the
left and right so as to face each other. The L-shaped reinforcing member 41 is a wood material
having a cross section of about 10 × 20 mm, and the rectangular reinforcing member 42 is a
wood material having a cross section of about 5 × 20 mm. The external dimensions of the
acoustic panel 100 assembled in this manner are about 1800 mm in height, about 35 mm in
thickness, and about 450 mm in length on one side (one plate body 2).
[0018]
FIG. 6 is a plan sectional view showing a bending pattern of the acoustic panel 100, where (a)
shows a state in which the plate members 2, 2 are folded such that the second members 3, 3 face
each other, (b ) Is bent from the state of (a) so that the angle between the plate members 2 and 2
(surface materials 24 and 24) is 90 °, and (c) is further bent from the state of (b) In this state,
the plate members 2 and 2 are bent so that the angle between them is 270 °. The corners on
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the surface side of the other side ends 2b and 2b of the plate members 2 and 2 adjacent to each
other are chamfered so that the corners of the adjacent plate members 2 and 2 do not interfere
with each other. As shown in (b), the angle between the second members 3 and 3 can be opened
up to 270 °. Further, in FIG. 6, detailed illustrations of the acoustic drive unit 5, the surface
member 24, the back surface member 25 and the like are omitted due to the relationship of the
drawings.
[0019]
FIG. 7 is a modification of the surface member 24 in FIG. 5 and is a plan cross-sectional view of
the acoustic panel 100A on the side where the acoustic drive unit 5 is provided. This surface
material 24A is a projecting plate 241 formed by backing a natural wood thin plate having a
thickness of about 0.3 mm with a paper having a thickness of about 0.2 mm and reinforced, and
about 2.5 mm in thickness bonded to the inner surface of the projecting plate 241. It consists of
plywood 242. The plywood 242 is formed smaller than the projecting plate 241. Then, a
projecting plate 241 is adhered to the entire surface of the frame 23, and a gap S2 of about 30
mm is provided with respect to the inner peripheral surfaces of the vertical beam 21 and the
horizontal beam 22 constituting the frame 23. It is glued. As described above, by forming the
surface material 24A from the projecting plate 241 and the plywood 242 attached to a part of
the inner surface of the projecting plate 241 to make a composite material, the inherent vibration
characteristic of a single material is relaxed, Acoustic characteristics can be improved. That is,
since a portion of approximately 30 mm around the entire circumference of the projecting plate
241 to which the plywood 242 is not bonded is flexible, this portion bends to facilitate piston
movement by the acoustic drive unit 5 of the portion to which the plywood 242 is bonded. Sound
characteristics are improved. Furthermore, by bonding the plywood 242, it is possible to obtain
the strength necessary for use. Although the gap S2 between the projecting plate 241 and the
plywood 242 is about 30 mm, it may be about 50 mm, and can be suitably changed to a
minimum thickness and area or an optimal shape in terms of strength and vibration
transmission.
[0020]
In addition, although not shown in the drawings, the surface material 24 may be constituted only
by a projecting plate 241 which is a natural wood thin plate with a thickness of about 0.3 mm
and backed by a paper with a thickness of about 0.2 mm. In this case, the projecting plate 241 is
adhered to the entire surface of the frame 23, and after the adhesive is cured, the back surface of
the projecting plate 241 is sufficiently wetted by spraying or the like and completely dried. As
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described above, since the surface material 24 is constituted only by the projecting plate 241
and the back surface of the projecting plate 241 is wetted by spraying or the like after the
adhesive is hardened and dried, the projecting plate 241 shrinks at this time. Because of the
rigidity of 22, a tensile stress is generated and can be securely fixed. That is, compared with the
case where the protruding plate 241 is bonded while applying tensile stress in advance, fixing
can be performed very easily and reliably. Also, although the total thickness of the protruding
plate 241 is about 0.5 mm, it has high flexibility and sufficient amplitude can be obtained, and
since a suitable tension is applied, the voice coil of the acoustic drive unit 5 described later When
the 52 is attached, unnecessary bending can be suppressed and distortion of sound due to
excessive divided vibration can be reduced. Therefore, unnecessary vibration and displacement
other than the amplitude direction of the portion driven by the acoustic drive unit 5 can be
reduced, and the acoustic characteristic is excellent. Moreover, weight reduction can be achieved.
As mentioned above, although the modification of surface material 24 was explained, the
thickness of surface material 24 should just be a range of 0.3 mm-6 mm, and makes surface
strength and acoustic characteristics compatible by changing according to an area be able to.
[0021]
Further, the acoustic drive unit 5 and a sound absorbing material (not shown) for adjusting the
sound quality are inserted in the space 26 formed between the front surface material 24 and the
back surface material 25 of the plate material main body 2 on the right side in FIG. ing. The
acoustic drive unit 5 is provided at a substantially central position in the lateral direction and the
height direction of the plate body 2. On the other hand, the acoustic drive unit 5 is not provided
in the space 26 formed between the front surface material 24 and the back surface material 25
of the left plate member main body 2, and the anti-vibration / sound absorption material (not
shown) is inserted. ing. As a material of a sound absorbing material, although wool materials,
such as tetron wool and glass wool, can be used, for example, it is not limited to these materials.
As described above, by inserting the anti-vibration / sound absorbing material into the space of
the left plate main body 2, the sound absorbing effect due to resonance can be prevented even
with a light weight, and the surface material 24 can obtain an acoustic reflection effect.
[0022]
FIG. 8 is a plan sectional view of the acoustic drive unit 5 provided in the plate main body 2. The
acoustic drive unit 5 includes a magnetic circuit 51 and a voice coil 52. The magnetic circuit 51
includes a yoke 511, a magnet 512 serving as magnetism generating means, and a top plate 513.
The yoke 511 is made of iron, and includes a disc-shaped disc portion 511 a fixed to the back
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surface member 25 and a columnar portion 511 b projecting from the center of the disc portion
511 a. The magnet 512 uses a ferrite magnet, and a cylindrical portion 511 a of the yoke 511 is
inserted at the center. In the top plate 513, a circular hole 513a having a size that allows
insertion of the cylindrical portion 511b of the yoke 511 is formed at the center of the disk. The
disc portion 511 a of the yoke 511 is fixed to the back surface member 25 by screwing the screw
N from the adhesive and the second member 3, and the magnet 512 is inserted through the
cylindrical portion 511 b of the yoke 511. Further, the hole 513a of the top plate 513 is inserted
into the cylindrical portion 511b, whereby the magnet 512 is locked to the disk portion 511a of
the yoke 511. Further, a gap is provided between the inner peripheral surface of the hole 513a
of the top plate 513 and the outer peripheral surface of the cylindrical portion 511b. Thus, the
magnetic circuit 51 is formed.
[0023]
On the other hand, the voice coil 52 is formed by winding a coil wire around a coil bobbin of a
predetermined size. Then, a reinforcing plate 53 made of aluminum having a thickness of about 1
mm is bonded to the inner surface of the surface material 24 corresponding to the magnetic
circuit 51, and a reinforcing ring made of heat resistant resin having a thickness of about 3 mm
on the reinforcing plate 53 made of aluminum. 54 is bonded, and the voice coil 52 is inserted
into the ring of the reinforcing ring 54, whereby the voice coil 52 is arranged to be concentric
with the magnetic circuit 51. Further, lead wires 55 for input signals, which connect the playback
apparatus (not shown) and the voice coil 52, are bonded along the inner surface of the surface
material 24. The stroke amount (moving amount) of the voice coil 52 is about ± 2 mm.
[0024]
Therefore, the signal for the voice coil from which the signal is output from the playback device
is amplified by the signal amplifier and then input to the voice coil 52. As a result, the voice coil
52 is driven in the low frequency band to vibrate the surface material 24 and sound is emitted
from the entire surface material 24. At this time, since the tip of the voice coil 52 is bonded and
fixed to the reinforcing plate 53 made of aluminum, good heat dissipation can be performed even
if the voice coil 52 generates heat at a large volume. Further, since the voice coil 52 is provided
on the surface material 24 and the magnetic circuit 51 is provided on the back surface material
25, assembly and maintenance become easy. In particular, if the surface material 24 is bonded to
the frame 23 in advance and a positioning guide (not shown) is provided on the frame 23 and the
back surface material 25, the surface material 24, the voice coil 52, the back surface material 25
and the magnet The voice coil 52 and the magnetic circuit 51 can be easily attached
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concentrically by positioning and attaching the back surface member 25 to the frame 23 by
attaching the circuit 51 to the correct position using a jig or the like. it can. The stroke amount of
the voice coil 52 may be about ± 1 mm. If it is about ± 1 mm, a very large sound pressure can
not be obtained, but the stroke amount of the voice coil 52 becomes short, so that the magnetic
circuit 51 can use magnetic flux concentratedly, which makes it compact and highly efficient in
design, Price reduction becomes easy.
[0025]
FIG. 9A and FIG. 9B are modified examples of the arrangement position of the acoustic drive unit
5, and are plan sectional views of the acoustic panel 100B. In FIG. 9, detailed illustration of the
surface material 24, the back surface material 25 and the like is omitted due to the relationship
of the drawing. As shown in FIG. 9, the acoustic drive unit 5 is disposed in the vicinity of the
bending center portion of the plate body 2 on the right side, that is, from the center in the leftright direction toward the plate body 2 on the left side. By arranging the drive unit 5 on the side
of the other plate body 2, changing the bending angle of the two plate bodies 2 as shown in FIGS.
It is possible to increase the sound pressure in the desired direction by changing it in the
direction of the arrow L, or to change the sound field more significantly by adjusting the
diffusion degree of the sound. Further, if the installation angle is narrowed, the radiation sound
pressure to the front becomes high due to the so-called horn effect.
[0026]
In addition, the acoustic panel 100 can be implemented in the form which deform | transformed
as follows. FIG. 10 shows an acoustic panel 100C provided with two high-pass acoustic drive
units 5C and 5C and a low-pass acoustic drive unit 5C ', wherein (a) is a perspective view as
viewed from the front side, (b) Is a perspective view when it sees from the back side. As shown in
FIG. 10, high-frequency acoustic drive units 5C configured in the same manner as the acoustic
drive unit 5 configured as described above are respectively disposed above and below one plate
material body 2, and these high-frequency acoustic drive units 5C are provided. , And 5C, a lowfrequency sound drive unit 5C 'having the same configuration as that described above is
disposed at the center between them. Further, at the lower end portion of the back surface of the
plate body 2, a rectangular digging portion 27C which penetrates into the frame 23 and exposes
the surface material 24 is formed. That is, the dug-in portion 27C is formed on the second
member 3 and the back surface material 25 with the surface material 24 remaining, and is
located below the lower high-frequency acoustic drive unit 5C. Then, an amplifier 28 is attached
to the recessed portion 27B, and an output portion is wired to the acoustic drive units 5C, 5C,
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and 5C '. By providing two high-pass acoustic drive units 5C and 5C and a low-pass acoustic drive
unit 5C 'in this way, the transmission from the playback device is not a high power low
impedance speaker output but a low power high impedance signal output The low-power highimpedance signal has less electrical loss and degradation even with relatively thin transmission
cables. That is, even in a large room, even when the distance between the acoustic panel 100C
and the reproduction device is long, the deterioration of sound due to transmission is reduced.
[0027]
FIGS. 11A and 11B show a tensioning device 6D for fixing the upper end portions of the acoustic
panels 100D and 100E installed on the installation surface M to a fixed portion (for example, a
ceiling surface) to prevent overturning. It is a perspective view of acoustic panel 100D, 100E in
which 6D was provided. As shown in FIG. 11 (a), a rectangular dug-out portion 27D which is
vertically penetrated into the frame 23 and exposes the back surface member 25 is formed
substantially at the center of the upper end portion of the front surface of the plate material body
2. ing. That is, the dug-in portion 27D is formed on the surface material 24 with the back surface
material 25 remaining, and the tension device 6D is attached to the dug-in portion 27D. As
disclosed in Japanese Patent Application No. 2005-123436, the tensioning device 6D includes a
rod-like member 61, a base 62 supporting the rod-like member 61 movably in the axial direction,
and a first insertion into which the rod-like member 61 is inserted. It has a hole (not shown), and
it rotates in the biting state where the edge of the first insertion hole bites into the rod member
61, and the state where biting is released by the rod member 61 playing with the first insertion
hole. The stopper mechanism 63, which is made possible, is provided so as to bite into the rod
member 61, and the rod member 61 bites into the rod member 61 by applying a pressing force
using the principle of leverage and bites the rod member 61 into the base 62 It has a power
boosting mechanism 64 which is movable in the pressing direction. The specific configuration
and operation of the tension device 6D are the same as in Japanese Patent Application No. 2005123436, and therefore the description thereof is omitted. The base 62 of the tension device 6D is
brought into contact with the back surface material 25 exposed to the recess 27D and fixed by
screws or the like.
[0028]
On the other hand, FIG. 11 (b) shows the case where the above-described tensioning devices 6D
and 6D are provided on the upper end side end face of the plate members 2 and 2 without
forming the above-mentioned recessed part 27D. Specifically, the base 62 of the tension device
6D is abutted on the upper end side end face on the side end 2a, 2a side of the plate body 2 and
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fixed by a screw or the like. By providing the tensioning device 6D as shown in FIGS. 11 (a) and
11 (b), the acoustic panels 100D and 100E can be firmly fixed between the installation surface M
and the ceiling surface by the tensioning device 6D. The fall prevention of the panels 100D and
100E can be performed very easily. In addition, since the tension device 6D is attached within the
thickness range of the plate body 2, it does not protrude to the front and back of the plate body
2, and there is no inconvenience in storage and transportation.
[0029]
Next, installation patterns of the acoustic panel 100 will be described. 12 (a) to 12 (d) are
perspective views of the acoustic panel 100 showing the installation pattern of the acoustic panel
100. FIG. As described above, in the acoustic panel 100, the chamfered plate members 2 and 2,
the rectangular plate-shaped second member 3, the reinforcing plate members 41 and 42, and
the like are joined to each other. The horizontal cross section is a polygonal shape formed by
combining a plurality of straight lines having different angles with each other, and is bendable
around the side end surfaces of the two plate members 2 and 2, so It is possible to set it up
independently. In FIG. 12A, the acoustic panel 100 has two plate members with the plate
members 2 and 2 facing the front side (for example, the indoor side) and the second member 3
facing the back side (for example, the wall side). The main bodies 2 and 2 are bent and installed
so that the surface materials 24 and 24 face each other. In FIG. 12 (b), the acoustic panel 100
has the second member 3 directed to the front side, the plate members 2 and 2 directed to the
back side, and the two plate members 2 and 2 are second members 3, 3 are bent and installed so
as to face each other. In FIG. 12C, the acoustic panel 100 has the second member 3 directed to
the front side and the plate members 2 and 2 directed to the back side, and the two plate
members 2 and 2 have respective surface members 24 and 24. They are bent so that they face
each other. In FIG. 12D, the acoustic panel 100 has the plate members 2 and 2 facing the front
side and the second member 3 facing the back side, and the two plate members 2 and 2 have the
second member 3, 3 are bent and installed so as to face each other.
[0030]
As described above, according to the embodiment of the present invention, the acoustic drive
unit 5 having the magnetic circuit 51 and the voice coil 52 is provided on the wood plate 1, and
the surface material 24 of the wood plate 1 is driven by the acoustic drive unit 5. Since the
vibration surface directly vibrates, the electric signal is converted to vibration by the acoustic
drive unit 5 and the surface material 24 is directly vibrated, whereby the sound is emitted from
the entire surface material 24 and functions as a speaker. That is, as is apparent from the fact
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that the cone of the general cone-shaped speaker uses wood fiber material, the wood plate 1 has
appropriate internal loss and propagation characteristics, and the vibration surface is the surface
of the wood plate 1. By using the material 24, it is possible to obtain good vibration
characteristics as a speaker. Therefore, such a wood board 1 can be used as a speaker, and since
the wood board 1 has a plate shape, the installation depth can be reduced, and the distance
between the listener and the speaker can be properly maintained even in a relatively narrow
room. It becomes easy to take a large area which can be listened to comfortably. It is also
convenient for storage.
[0031]
Further, since the acoustic drive unit 5 is disposed within the thickness of the wood plate 1 (in
the plate body 2), there are no protrusions on the front and back surfaces of the wood plate 1,
and the sound drive unit 5 changes in sound quality. Even without a cover, it is safe and there is
no risk of damage. In addition, since the sound drive unit 5 can be visually recognized from the
outside, the listener is not conscious of the sound source and does not disturb the feeling as a
psychologically natural ambience sound. Furthermore, the design with a photograph, a
wallpaper, etc. can also be given to the surface and back surface of the wood board material 1 in
the range with little influence on acoustic characteristics, and it can be excellent in an aesthetic
appearance. The wood plate material 1 is formed by joining the plate material bodies 2 and 2
which have been chamfered, the second member 3 having a rectangular plate shape, the
reinforcing plate materials 41 and 42 and the like, and the cross section horizontal to the
installation surface M is Since the plurality of straight lines having different angles are combined
to form a polygonal shape, stable self-supporting on the installation surface M such as on the
floor is possible. Therefore, the installation is easy because there is no need for a dedicated stand
or a part for fixing or its installation work. Moreover, since it has a plurality of acoustic reflection
directions, it can also be used as an acoustic reflector excellent in the diffuse reflection effect.
[0032]
Since the surface material 24 is made of plywood having a higher acoustic reflectance than the
second member 3 and the second member 3 is made of a carpet or the like having a higher
acoustic sound absorption coefficient than the surface material 24, when not used as a speaker,
By directing the second member 3 to the indoor side, a sound absorbing plate can be formed, and
the reverberation in the room can be adjusted. Moreover, according to the clearance between the
wall and the second member 3 by facing the surface member 24 to the indoor side and directing
the second member 3 to the wall side when used as a speaker or an acoustic reflection plate It
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can absorb and prevent harmful standing waves generated by frequency, and can create a good
indoor sound field.
[0033]
Two plate members 2, 2 are provided adjacent to each other on the second member 3 made of a
single carpet or the like, and the surface members 24, 24 or each other are disposed centering
on between the plate members 2, 2. Since the members 3 and 3 are foldable so as to face each
other, the folding angle can be adjusted according to the installation space and can be freely
installed. In addition, the sound reflection direction can be adjusted by adjusting the bending
angle, so that the sound field characteristics in the room can be adjusted, and the performance
can be improved. In addition, since it is bendable, it can be easily transported and the storage
space can be reduced. Furthermore, even if it is freely bendable, it does not require a minute gap
for pivotally supporting like a hinge, so there is no generation of noise such as billy due to the
minute gap due to the vibration from the speaker, and the acoustic characteristic Since the two
plate members 2, 2 are foldably connected by one second member 3, breakage or deterioration
of the bent portion is less likely to occur.
[0034]
Since the entire surface of the vibrating surface is integrally formed by a single surface material
24, the vibrating surface is integrated, and the vibrating portion can not be discriminated from
the outside, and the appearance is the same as a simple acoustic reflector; Excellent. In addition,
since the area of the vibration surface can be increased, the amplitude for obtaining a constant
sound pressure is reduced, the reproduction of sound with little distortion is facilitated, and the
thickness of the acoustic drive unit 5 is also facilitated. Further, since a separate diaphragm part
or the like is unnecessary, the number of parts is small, the assembly is easy, and it can be
manufactured inexpensively.
[0035]
Furthermore, in the acoustic panel 100 of the present invention, the acoustic drive unit 5 is
provided only on the plate material body 2 on the right side, but if used upside down, the
arrangement of the acoustic drive unit 5 is switched to the left and right. It is sufficient to
produce only one type of acoustic panel 100, which is excellent in production efficiency and can
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reduce the production cost. Further, by designing and adjusting the acoustic panel 100 of the
present invention as a dedicated surround speaker, it is possible to make a thin, highly efficient,
inexpensive speaker particularly suitable for creating an atmospheric sound.
[0036]
The present invention is not limited to the above embodiment, and can be appropriately modified
without departing from the scope of the invention. For example, in the above embodiment, the
wood plate material 1 is formed by joining the plate material bodies 2 and 2 which have been
chamfered, the second member 3 having a rectangular plate shape, the reinforcing plate
materials 41 and 42, etc. The cross section horizontal to the above is a polygonal shape formed
by combining a plurality of straight lines having different angles with each other, but it may be a
curved surface shape having an arc shape.
[0037]
Further, although the acoustic drive unit 5 is provided only on the plate body 2 on the right side
in FIG. 3 among the two plate bodies 2 and 2, it may be provided on both plate bodies 2 and 2,
respectively. In addition, although the acoustic drive unit 5 is composed of two plate members 2,
2 and one second member 3 provided on the back of these members, three or more plate
members 2, 2,. You may comprise from the 2nd member 3 of a sheet. Furthermore, although the
acoustic drive unit 5 mainly includes the magnetic circuit 51 and the voice coil 52, a piezoelectric
element may be adopted as the acoustic drive unit 5.
[0038]
It is a perspective view at the time of seeing acoustic panel 100 from the surface side. It is a
perspective view at the time of seeing acoustic panel 100 from the back side. FIG. 2 is a plan
sectional view of the acoustic panel 100. It is a front view of frame 23 which assembles vertical
beam 21 and horizontal beam 22 vertically and horizontally. FIG. 6 is a plan cross-sectional view
of the side on which the acoustic drive unit 5 of the acoustic panel 100 is provided. (a)-(c) is the
plane sectional view which showed the bending pattern of the acoustic panel 100. FIG. It is a
modification of the surface material 24, Comprising: It is a plane sectional view of the side in
which the acoustic drive unit 5 of the acoustic panel 100A was provided. FIG. 5 is a plan crosssectional view of the acoustic drive unit 5 provided in the plate main body 2; (a), (b) is a
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modification of the arrangement position of acoustic drive unit 5, and is a plane sectional view of
acoustic panel 100B. It is an acoustic panel 100C provided with two high-pass acoustic drive
units 5C and 5C and a low-pass acoustic drive unit 5C ', wherein (a) is a perspective view as
viewed from the front side, (b) is a back side view Is a perspective view of the case. (a), (b) is a
perspective view of acoustic panel 100D, 100E in which strut apparatus 6D, 6D was provided.
(a)-(d) is a perspective view of the acoustic panel which showed the installation pattern of the
acoustic panel 100. FIG.
Explanation of sign
[0039]
DESCRIPTION OF SYMBOLS 1 wood board material 2 board material main body 3 2nd member 5
acoustic drive unit (drive body) 23 frame 24 surface material (1st member) 25 back surface
material 241 projecting plate 242 plywood 100, 100A acoustic panel (wood panel)
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