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JP2015144330

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DESCRIPTION JP2015144330
Abstract: To provide a speaker device that has high sound transmission efficiency and can be
made compact. A speaker device 1 comprising at least a radiation plate 2 and a vibration device
4 connected to the radiation plate for generating vibration, the vibration device comprising an
actuator 30 for converting an electric signal into vibration, An annular drive member 304 having
one end provided on a dome-shaped cap 303 of the actuator, an amplification means 31
provided to cover the drive member at the other end of the drive member, and a transmission
means provided on the amplification means 5 and the cap, the driving member and the
amplifying means constitute a vibration transmission space S. [Selected figure] Figure 1
Speaker device
[0001]
The present invention relates to a speaker device.
[0002]
Conventionally, a speaker device is a device that stimulates human hearing and listens to sound,
and after an electric signal is input to a vibration device and converted into vibration by the
vibration device, it is transmitted to a sound generation part and emitted as sound Various
speaker devices are considered.
[0003]
However, the speaker device disclosed in Patent Document 1 below has a yoke as a sound source,
a permanent magnet, a voice coil to which an electric signal is applied in the magnetic field, and a
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1
support portion that supports the voice coil in a suspended state. A case for accommodating
them, a lid for closing the opening of the case, and a recess for attaching one end of the support
portion and allowing the proximal end of the rod-like member to abut, and the vibration
generated from the sound source is As it is, it is only transmitted to the sprinkling member as a
speaker via the rod-like member, and a sufficient sound volume can not be obtained, and in order
to obtain a large sound volume, it is necessary to make the sound source large. There was a
problem that the weight was too heavy.
[0004]
JP, 2009-159248, A
[0005]
The present invention has been made in view of the above problems, and an object of the present
invention is to provide a speaker device that has high sound transmission efficiency and can be
made compact.
[0006]
The speaker device according to the present invention is a speaker device provided with at least
a radiation plate and a vibration device connected to the radiation plate to generate a vibration,
the vibration device comprising an actuator for converting an electric signal into a vibration, and
An annular drive member having one end provided on a dome-shaped cap of the actuator, an
amplification means provided on the other end of the drive member so as to cover the drive
member, and a transmission means provided on the amplification means A vibration
transmission space is constituted by the cap, the drive member, and the amplification means.
In the present invention, it is preferable that the amplification means is formed in a plate shape,
and is configured to protrude to the side of the drive member.
In the present invention, it is preferable that the transmission means be provided in the vicinity
of a position passing through the central axis of the cap in the amplification means.
In the present invention, the vibration transfer space is preferably a sealed space.
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In the present invention, it is preferable that the vibration device is provided on the back surface
of the radiation plate, and the vibration generated by the vibration device is transmitted to the
radiation plate and the vibration is radiated as a sound from the radiation plate. .
[0007]
The present invention is a speaker device provided with at least a radiation plate and a vibration
device connected to the radiation plate to generate a vibration, the vibration device comprising
an actuator for converting an electrical signal into a vibration, and a dome shape of the actuator
An annular drive member having one end provided on the cap, amplification means provided on
the other end of the drive member so as to cover the drive member, and transmission means
provided on the amplification means; Since the vibration transmission space is constituted by the
drive member and the amplification means, the vibration generated by the actuator is amplified
and transmitted to the amplification means through the drive member, and the radiation plate In
addition, vibration transmission space causes vibration emitted from the dome-like cap of the
actuator. The has the effect of being able to transmit to the amplifying means, there is an effect
that the vibration device can be compact and lightweight.
According to the second aspect of the present invention, the amplification means formed in a
plate shape protruding to the side of the drive member has an effect of enabling amplification to
be larger. According to the third aspect of the present invention, the transmission means can
effectively amplify the transmission means provided near the position passing through the
central axis of the cap in the amplification means. According to the fourth aspect of the present
invention, the vibration transmission space is formed in a sealed space, so that the vibration
radiated from the dome-like cap of the actuator can be efficiently transmitted to the amplification
means.
[0008]
FIG. 1 is a front view (cross-sectional view) of a speaker device according to an embodiment of
the present invention. FIG. 2 is an enlarged cross-sectional view of the vibration device in the
above-mentioned speaker device. FIG. 3 is an enlarged plan view of the vibration device in the
above speaker device. FIG. 4 is an external perspective view of the above speaker device. FIG. 5 is
an external perspective view of a speaker device according to another embodiment of the present
invention. FIG. 6 is an enlarged cross-sectional view of a vibration device according to another
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embodiment of the present invention. FIG. 7 is an enlarged plan view of a vibration device
according to another embodiment of the present invention.
[0009]
Hereinafter, embodiments of the speaker device of the present invention will be described with
reference to FIGS. 1 to 4. The speaker device 1 includes a radiation plate 2, a vibration transfer
member 3 and a vibration device 4, and the vibration device 4 is provided with an end on an
actuator 30 for converting an electric signal to vibration and a dome-shaped cap 303 of the
actuator 30. An annular drive member 304, an amplification means 31 provided at the other end
of the drive member 304 to cover the drive member 304, and a transmission means 5 provided
at a position passing through the central axis of the cap 303 in the amplification means 31; The
vibration transmitting space S is constituted by the cap 303, the driving member 303 and the
amplifying means 31. The vibration transmission space S is preferably a sealed space, but may be
somewhat open. It becomes possible to obtain twice the volume of the one in which the vibration
transmission space S is sealed in comparison with the one in which the vibration transmission
space S is not sealed. By providing the vibration transmission space S, it is possible to efficiently
transmit the vibration radiated from the dome-shaped cap of the actuator to the amplification
means.
[0010]
The actuator 30 includes a magnet 301, a voice coil 302, and a cap 303.
[0011]
The magnet 301 is fixed by a fixing tool 306 substantially at the center of the surface of the
pedestal 32 (corresponding to the bottom surface of the protective cover).
The magnet 301 is provided with a voice coil storage groove 305 opened in the surface thereof.
The voice coil storage groove 305 is annularly formed in a plan view (as viewed from the surface
of the magnet 301). The voice coil 302 is formed in a ring shape. The voice coil 302 is stored in
the storage groove 305. The cap 303 is formed of a thin plastic disc.
[0012]
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The cap 303 holds the voice coil 302 so as not to drop out of the storage groove 305. The cap
303 is provided on the surface of the magnet 301 so as to close the opening of the storage
groove, and is formed in a dome shape.
[0013]
The driving member 304 is made of paper such as cardboard and is formed in a cylindrical
shape. The diameter of the drive member 304 is formed substantially equal to the diameter of
the voice coil 302. The drive member 304 is provided on the surface of the cap 303. At this time,
the end of the voice coil 302 and the end of the drive member 304 are disposed to face each
other with the cap 303 interposed therebetween, so that the vibration can be efficiently
transmitted. The end of the driving member 304 in contact with the cap 303 is formed to be
obliquely inclined so that the inside is high so as to be in close contact with the cap 303, and
vibration is efficiently transmitted by surface contact. . The driving member 304 is provided with
an amplification means 31.
[0014]
The amplification means 31 may be, for example, metal, plastic and wood plates, but is
preferably formed of a smooth plate. The amplification means 31 is formed to protrude to the
side of the drive member, and has the effect of being able to amplify larger. The amplification
means 31 is provided with a fixed base 33.
[0015]
The fixing base 33 is fixed so that the center of the diameter of the driving member 304 disposed
opposite to the amplification means 31 and the center position of the fixing base 33 coincide
with each other. That is, the center of the magnet 301 of the actuator constituting the vibration
device 4, the center of the voice coil 302, the center of the voice coil storage groove 305, the
center of the cap 303, the center of the drive member 304, and the center of the amplification
means 31 The center of the fixed base 33 is a structure in which the center lines of the X
direction, the Y direction, and the Z direction coincide with the center of the recess of the fixed
base 33, and the electric signal input to the vibration device 4 vibrates. The center of the recess
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of the fixed base 33 is the center point of the vibration to form the center point sound source of
the vibration device 4, and the center point sound source of the vibration device 4 is in contact
with the concave portion of the fixed base 33. Can be obtained easily. As described above, when
the vibration is transmitted from the vibration device 4 to the vibration transfer member 3, the
vibration is transmitted centrally as a central point sound source, that is, at one point. In this
case, strong vibration is obtained in the vibration transfer member 3 and transmitted to the
radiation plate 2 so that sound is generated and emitted with wide directivity in a wide range.
The center of the fixed base 33 of the vibrating device 4 as used herein is not strictly used, and
may be slightly offset from the perfect center, and passes through the central axis of the cap 303
in the amplification means 31. It suffices to be provided near the position. Satisfactory sound
volume can be obtained if it is within the area of 10% of the diameter of the cap 303 (in the case
of a 20 mm diameter cap, the area within 2 mm from the center) in the vicinity position It is
possible. The fixing base 33 is made of metal or wood, but preferably is air-drying material. In
this case, the fixed base 33 is compressed by the abutment of the transmission means 5 and the
vibration transmission member 3, and the repulsive force from the inside of the wood increases
the adhesion, the transmission efficiency of the sound source obtained from the vibration device
4 increases, and the transmission means 5 And the vibration transmitting member 3.
[0016]
The sound source obtained from the vibration device 4 is transmitted to the vibration
transmission member 3 through the transmission means 5 shown in FIG. 1 (b), or a portion
where one end of the vibration transmission member 3 is formed in a rod shape is fixed base 33.
The vibration is transmitted intensively and strongly at one point. In this case, it is possible to
compensate for the loss of vibration transmission which is reduced by human touch. The
vibration generator protection member 41 of the vibration device 4 is made of wood. The
vibration transmitting member 3 and the transmitting means 5 are preferably made of an air-dry
material, and the vibration obtained from the vibrating device 4 is preferably transmitted along
the fiber direction. In this case, the transmission efficiency of the sound source obtained from the
vibration device 4 is enhanced and transmitted to the radiation plate 2.
[0017]
In the radiation plate 2, the end portions 201 and 202 on the plane of the radiation plate 2 are
overlapped and fixed in a place where the vibration transfer member 3 is provided, and the end
portion of the vibration transfer member 3 provided on the outer circle side is formed in a bar
shape The vibration is abutted to the vibration device 4 and the vibration is intensively and
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strongly transmitted to the end of the vibration transmission member 3. The connection fixing
portion of the radiation plate 2 may be the vibration transmitting member 3 provided on the
inner circle side. The end portion of the vibration transfer member 3 is formed in a concave
shape and abuts on the vibration device 4 through the transfer means 5 shown in FIG. 1 (b), and
the vibration is intensively strongly transmitted to the end portion of the vibration transfer
member 3 There is. The shape of the unevenness on the end portion of the vibration transfer
member 3 is appropriately selected according to the cross-sectional shape of the vibration
transfer member 3. The vibration transmission member 3 and the transmission means 5 may be
integrally formed or separately formed.
[0018]
FIG. 5 is an external perspective view of a speaker device according to another embodiment of
the present invention. The speaker 1 includes a radiation plate 2, a vibration device 4, a vibration
transmission member 3 and a transmission means 5.
[0019]
As the radiation plate 2, a wooden flat plate made of an air-dried material is used in order to
transmit the vibration smoothly to the whole.
Examples of the wooden flat plate include solid wood, plywood in which thin sheets of solid wood
are laminated, and laminated wood in which plural solid woods are combined. Among these, the
radiation plate 2 is preferably formed of a solid material. The radiation plate 2 is formed of an
air-dry material. The air-dried material is wood (wood) which has been dried in the air (in air),
and is in an equilibrium state at a constant moisture content according to the temperature and
humidity of the air. Furthermore, as the radiation plate 2, it is preferable to use balanced wood
among air-dried materials. The equilibrium wood is an air-dried material in which the indoor air
environment is in an equilibrium state at a predetermined moisture content in an indoor air
environment controlled to a comfortable temperature and humidity by mechanical equipment
(heating device and cooling device).
[0020]
The drying method for obtaining the air-dried material used as the radiation plate 2 may be a
natural drying method of drying in the air, or an artificial drying method using various drying
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machines. In the drying method using a drying machine, it is necessary to expose to the
atmosphere (in air) after drying to cure until the moisture content is in equilibrium. The method
of obtaining the air-dried material is not limited to either the natural drying method or the
artificial drying method. The radiation plate 2 is formed in an appropriate shape, for example,
formed in a rectangular shape. Further, the size of the radiation plate 2 is appropriately formed.
In the case of the rectangular radiation plate 2, for example, the dimension in the longitudinal
direction is 420 to 4000 mm, the dimension in the lateral direction is 210 to 2000 mm, and the
thickness is 3 to 30 mm. More specifically, the radiation plate 2 is formed to have a dimension of
3000 mm in the longitudinal direction, a dimension of 1000 mm in the lateral direction, and a
thickness of 30 mm. The longitudinal direction of the radiation plate 2 is preferably parallel to
the fiber direction (grain direction Y). Moreover, it is preferable that the short direction of the
radiation plate 2 is parallel to the annual ring direction X. Note that the parallel referred to here
is not strictly parallel, and may be slightly deviated. When the longitudinal direction of the
radiation plate 2 is parallel to the fiber direction, the vibration is easily transmitted in the
longitudinal direction of the radiation plate 2 and the vibration is easily transmitted uniformly to
the entire radiation plate 2. The specific gravity of the radiation plate 2 is preferably 0.3 to 0.65.
A coating may be formed on the surface of the radiation plate 2 (the surface on which sound is
emitted). Thereby, the sound radiated from the radiation plate 2 changes. For example, if a
coating film having a hardness higher than that of wood is formed on the surface of the radiation
plate 2, it is likely that a hard, high sound is emitted. As a coating film, lacquer, a urethane paint,
etc. can be illustrated. The coating film may be provided on the entire surface of the radiation
plate 2 or may be provided on a part thereof.
[0021]
The vibration device 4 includes the actuator 30, the amplification means 31, and the
amplification plate 31-01 as shown in FIGS. The amplification means 31 and the amplification
plate 31-01 may be separately attached in close contact with each other using a silicon sheet or
the like, or may be adhered and fixed, and are integrally formed. It does not matter. The cap 303,
the driving member 304, and the amplification means 31 constitute a vibration transmission
space S. The vibration transmission space S is preferably a sealed space, but may be somewhat
open. It becomes possible to obtain twice the volume of the one in which the vibration
transmission space S is sealed in comparison with the one in which the vibration transmission
space S is not sealed. By providing the vibration transmission space S, it is possible to efficiently
transmit the vibration radiated from the dome-shaped cap of the actuator to the amplification
means.
[0022]
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The amplification plate 31-01 is for more smoothly transmitting the vibration from the actuator
30 to the vibration transfer member 3. The amplification plate 31-01 is formed of a rectangular
flat plate. The amplification plate 31-01 is formed of a wooden flat plate, a metal flat plate, a
plastic flat plate, or the like. As a flat plate of wood, similarly to the radiation plate 2, solid wood,
medium density fiber board (MDF), particle board, plywood, laminated wood and the like are
exemplified. Among these, the amplification plate 31-01 is preferably formed of a solid material.
Further, like the radiation plate 2, the amplification plate 31-01 is preferably formed of an airdrying material, and more preferably formed of balanced wood. The specific gravity of the
amplification plate 31-01 is also preferably 0.3 to 0.65. Furthermore, although the amplification
plate 31-01 may be either lumber or lumber wood (made of wood), it is preferable to use a gauze.
Further, it is preferable that the wood grain direction of the amplification plate 31-01 be parallel
to the longitudinal direction of the amplification plate 31-01, whereby the vibration is easily
transmitted to the entire amplification plate 31-01. As a metal flat plate, an aluminum plate etc.
can be illustrated. An acrylic board etc. can be illustrated as a plastic flat board. Further, the
amplification plate 31 does not have to be a completely flat plate, and may be slightly warped or
have small irregularities on the surface. The amplification plate 31-01 is disposed to face the
pedestal 32. The longitudinal end of the amplification plate 31-01 and the longitudinal end of the
pedestal 32 are connected to each other at both ends in the longitudinal direction of the
vibration device 4 by the vibration generating portion protective material 41. The amplification
plate 31-01 and the vibration generator protection member 41, and the pedestal 32 and the
vibration generator protection member 41 are connected by adhesion or the like. An actuator 30
is provided between the amplification plate 31-01 and the pedestal 32. The tip of the drive
member 304 of the actuator 30 is in contact with the back surface of the amplification means 31
(the surface facing the pedestal 32). The tip of the drive member 304 and the back surface of the
amplification plate means 31 are bonded. The amplification plate 31-01 has a function of
protecting the actuator 30 in addition to the function of amplifying the vibration.
[0023]
A fixing base 33 is provided on the surface of the amplification plate 31-01. The fixing base 33 is
made of wood, metal, plastic or the like, and is formed in, for example, a cylindrical shape. The
fixing base 33 is provided at the center of the surface of the amplification plate 31-01. The
circular bottom of the fixing base 33 is bonded to the surface of the amplification plate 31-01.
The fixed base 33 is provided with the transmission means 5. The transmission means 5 is
formed of a bar made of wood, metal, plastic, bamboo or the like. The transmission means 5 is
formed to have a diameter smaller than the diameter of the fixed base 33, and is formed, for
example, to a diameter of 5 to 9 mm. The transmission means 5 is inserted into and fixed to the
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fixed base 33 from the center of its tip end face. The tip of the transmission means 5 protrudes
from the center of the tip surface of the fixed base 33.
[0024]
The vibration device 4 generates vibration based on an electrical signal of sound. That is, when
an electric signal from an amplifier or the like is input to the voice coil 302 of the actuator 30
and a current flows, the voice coil 302 vibrates under the influence of magnetism of the magnet
301. Since the voice coil 302 is in contact with the drive member 304 via the cap 303, the
vibration of the voice coil 302 is transmitted to the drive member 304. Since the drive member
304 is in contact with the amplification means 31, the vibration of the drive member 304 is
transmitted to the amplification means 31. The transmission means 5 also vibrates with the
vibration of the amplification plate 31-01. The vibration of the voice coil 302 is emitted as sound
from the surface of the dome-shaped cap 303. The emitted sound is sealed by the cap 303, the
driving device 304 and the amplifying means 31 and transmitted to the amplifying means 31 as
a strong vibration. Thus, vibration can be generated by the vibration device 4. The dimension
(vibration width) H in the longitudinal direction of the vibrating portion of the amplification plate
31-01 is the same as the dimension between the two vibration generating portion protection
members 41. The vibration width H is formed larger than the diameter D of the voice coil 302.
Therefore, when the vibration of the voice coil 302 is transmitted to the amplification plate 3101, almost the entire amplification plate 31-01 vibrates and becomes larger than the vibration
width (same as the diameter D) of the vibration of the voice coil 302. . Thus, the vibration width
of the vibration of the voice coil 302 is amplified by the amplification plate 31-01. The sound
volume and the sound range radiated from the radiation plate 2 are changed according to the
material, the size, the vibration width H and the like of the amplification plate 31-01. Although
the above-mentioned vibration device 4 is formed in a rectangular shape in a plan view, it is not
limited thereto.
[0025]
The vibration transmitting member 3 is for more smoothly transmitting the vibration from the
vibrating device 4 to the radiation plate 2. The vibration transmission member 3 is formed of a
rectangular flat plate, a square member or the like. The vibration transmitting member 3 is
formed of wood, metal, plastic, bamboo or the like. Similar to the radiation plate 2, examples of
the vibration transmission member 3 made of wood include solid wood, medium density fiber
board (MDF), particle board, plywood, laminated wood and the like. Among these, the vibration
transfer member 3 is preferably formed of a solid material. The vibration transmitting member 3
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is preferably made of air-dried material as in the case of the radiation plate 2, and more
preferably made of balanced wood. The specific gravity of the vibration transfer member 3 is also
preferably 0.3 to 0.65. Furthermore, although the vibration transmission member 3 may be
either lumber or lumber (made of wood), a girder is preferable. The grain direction Y of the
vibration transfer member 3 is preferably parallel to the longitudinal direction of the vibration
transfer member 3 so that the vibration can be easily transmitted to the entire vibration transfer
member 3. An aluminum plate etc. can be illustrated as vibration transmission member 3 made
of metal. An acrylic board etc. can be illustrated as vibration transmission member 3 made of
plastic. The vibration transmitting member 3 does not have to be a completely flat plate, and may
be slightly warped or have small irregularities on the surface. The dimension in the longitudinal
direction of the vibration transfer member 3 can be formed to be equal to or slightly shorter than
the dimension in the lateral direction of the radiation plate 2. The dimension of the vibration
transfer member 3 in the short side direction may be 12 to 100 mm, preferably 20 mm, and the
thickness of the vibration transfer member 3 may be 9 to 20 mm, preferably 15 mm, but is not
limited thereto. .
[0026]
The speaker 1 is formed by integrating the radiation plate 2, the vibration transfer member 3 and
the vibration device 4. The vibration transfer member 3 is attached to the back surface of the
radiation plate 2 by screws or the like. In this case, the vibration transfer member 3 is provided
such that its longitudinal direction intersects with the longitudinal direction of the radiation plate
2, that is, the fiber direction (grain direction Y). The vibration transfer member 3 is provided over
the entire length of the radial direction of the radiation plate 2, that is, the annual ring direction
X. In the present specification, “crossing” is not used in a strict sense, and may cross at a large
angle from 90 °. Also, “parallel” is not used in a strict sense, and may be substantially
parallel. The term "full length" is not used in a strict sense, and may be slightly longer or shorter
than the full length. The vibration device 4 is provided on the back surface side of the vibration
transmission member 3 (in the direction not adhering to the radiation plate 2). In this case, a
coupling hole is provided substantially at the center of the vibration transmitting member 3 in
the longitudinal direction, and the transmitting means 5 of the vibrating device 4 is inserted into
the coupling hole. The vibration transfer member 3 and the transfer means 5 may be bonded or
may not be bonded. In such a speaker 1, the vibration generated by the actuator 30 of the
vibration device 4 is transmitted to the amplification plate 31-01, the fixed base 33, and the
transmission means 5, and this vibration is transmitted from the transmission means 5 to the
vibration transmission member 3. Further, they are transmitted from the vibration transmitting
member 3 to the radiation plate 2. Then, the vibration transmitted to the radiation plate 2 is
radiated and diffused into the air as sound. As described above, when being transmitted from the
transmission means 5 to the vibration transmission member 3, the point sound source, that is,
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the vibration is intensively transmitted to one point. In this case, sound is emitted uniformly in a
wide range with a wide directivity.
[0027]
And the speaker 1 of this Embodiment has the following effects. By using an air-dry material as
the radiation plate 2, the vibration transfer member 3, and the amplification plate 31-01, it
adapts to changes in the indoor air environment, and cracking and deformation hardly occur.
Moreover, by using a wooden member mainly, since an electrostatic charge is not charged, it
becomes difficult to produce an electrical stress. Further, since the cellular structure (conduit) of
the radiation plate 2 contains a large amount of air layer, the sound radiated from the radiation
plate 2 is likely to be a "soft sound" having a small amount of high frequency components.
Further, since the light emitting / receiving plate 2 has subtle irregularities based on the cell
structure, ultraviolet light is absorbed by repeating irregular reflection of light, glare (glare) can
be reduced, and the eye is less fatigued. There is also a "humidity control function" in which the
highly hydrophilic cell structure is in equilibrium at the molecular level so that the water
retention state is always constant, and the room installed tends to be comfortable. Wood also has
a unique scent that calms down people's mind, so it is easy to reduce fatigue and stress with the
sound, and it is easy to get a sense of relaxation. Since there are annual rings in the wood grain
and the annual ring width is not constant, it is thought that 1 / f fluctuation exists in the intervals
of the annual rings whose growth conditions are different depending on the natural environment.
This fluctuation is likely to give people a natural-looking image. In addition, the use of wood can
contribute to the fixation of carbon dioxide and the preservation of the forest environment. In
addition, no enclosure is required, no standing wave is generated, and the deterioration of sound
quality can be reduced.
[0028]
Reference Signs List 1 speaker device 2 radiation plate 3 vibration transmission member 4
vibration device 30 actuator 303 cap 304 drive member 31 amplification means 5 transmission
means S vibration transmission space
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