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JP2012070200

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DESCRIPTION JP2012070200
The present invention provides a panel-type acoustic generator that integrates an amplifier and a
sound generator, prevents vibration of a diaphragm from being transmitted to the amplifier, and
suppresses resonance to generate sound with excellent sound quality. . SOLUTION: An exciter 2
is provided between a pair of opposed diaphragms 1a and 1b, and an amplifier 3 held by a
damping member 4 is disposed between the pair of diaphragms 1a and 1b. Panel-type sound
generator built in. The thicknesses of the pair of diaphragms 1a and 1b may be non-identical at
opposing positions. [Selected figure] Figure 1
Panel type sound generator
[0001]
The present invention relates to a sound generating device, and more particularly, a panel type
sound generating device in which an exciter for giving vibration to these diaphragms is
interposed between a pair of panel-type diaphragms disposed opposite to each other. It is about
[0002]
Conventionally, in a self-sustaining sound generator, as shown in FIG. 5, an audio signal input
from the outside and converted into a weak current is amplified by an external amplification unit
6 and sent to a sound generator 7. Be
The exciter installed in the sound generator 7 vibrates the diaphragm of the sound generator 7 to
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generate sounds such as voice announcements and background music.
[0003]
On the other hand, in recent years, with the progress of thinning of panel type speakers, a panel
type speaker system has been proposed in which the amplifier device of the above amplification
unit is interposed between a pair of panel type diaphragms.
[0004]
For example, Japanese Patent Application Laid-Open No. 2002-27588 includes a pair of flat
diaphragms disposed opposite to each other in front and rear, and one or more exciters
interposed between the diaphragms, and the voice in the exciter Disclosed is a panel type
speaker system characterized in that a bobbin portion on which a coil is wound and a magnetic
circuit portion forming a magnetic gap in which the voice coil is inserted are respectively fixed to
a part of the inner surface of each diaphragm. It is done.
[0005]
As shown in FIGS. 7 and 8 of Japanese Patent Application Laid-Open No. 2002-27588,
characters, illustrations, and photographs are formed on the surfaces of a pair of flat diaphragms
disposed opposite to each other in front and back of the panel type speaker system. It is possible
to display information etc. visually, and at the same time visually advertise and guide products
and the like, it is possible to advertise various products by voice announcement in real time.
[0006]
Then, since clear voice signals can be emitted in all directions and the contents can be heard
naturally without discomfort wherever you ask them, it can be installed in a store or shop such as
a supermarket and used for sales promotion etc. The effect is stated.
[0007]
Japanese Patent Application Laid-Open No. 2002-27588
[0008]
However, in the technique described in Patent Document 1, as shown in FIG. 6, the amplifier
device is sandwiched between a pair of flat diaphragms, so the vibration of the diaphragm is
directly transmitted to the amplifier device. There has been a problem that a failure such as
breakage of a connection portion in the amplifier device or disconnection of a lead occurs.
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[0009]
In addition, in a sound range of a specific frequency, a pair of diaphragms resonate to cause
howling, which causes a problem of sudden loudness.
The present invention has been made in view of the above background art, and its object is to
unify the amplifier and the sound generator, to prevent the vibration of the diaphragm from
being transmitted to the amplifier, and to suppress the resonance to achieve excellent sound
quality. Providing a panel-type sound generator capable of generating sound.
[0010]
In order to solve the above-mentioned subject, in the panel type sound generating device
concerning the invention according to claim 1 of this application, while providing an exciter
between a pair of diaphragms arranged facing each other, between a pair of diaphragms. It is
characterized in that the amplifier held by the damping member is installed.
[0011]
As the diaphragm, one obtained by sandwiching a core material having a honeycomb structure or
a foam structure between two film-like or sheet-like surface layer vibration materials is used, and
as the surface layer vibration material, a carbon fiber is used. A high hardness and impact
resistant material obtained by processing synthetic fibers or synthetic resin such as Kepler or the
like into a film or sheet is used.
[0012]
As the core material, for example, a lightweight metal such as aluminum or glass fiber reinforced
plastic (FRP) processed into a honeycomb structure, or a lightweight, highly rigid foam made of a
foamed material such as modified polystyrene foam is used. Can.
In addition, it is also possible to use one obtained by integrally molding the surface vibration
material and the core material.
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[0013]
Furthermore, as the diaphragm used in the present invention, not only one composed of the
surface layer vibration material and the core material, but also a thin-clad diaphragm composed
of wood material, paper material, resin impregnated paper, metal plate etc. A thin film diaphragm
made of synthetic resin such as polyvinyl chloride resin, polyethylene resin, polypropylene resin,
polystyrene resin, polyester resin can be used.
[0014]
As the exciter, one comprising an exciter element is usually used.
As the exciter element, one having a known structure including an inner yoke, an outer yoke, a
permanent magnet, a cancel magnet, a voice coil, and a vibrator that vibrates back and forth by a
driving force generated in the voice coil is used. A sound is generated when the vibration is
transmitted to the diaphragm from the tip portion of the vibrator fixed to the plate by bonding or
the like.
[0015]
The amplifier includes a control function for selecting, mixing or amplifying a weak signal
current, level adjustment, a power amplification function for obtaining a driving power by
amplifying a controlled signal, and a battery as a power supply. An apparatus is used.
[0016]
In the panel-type acoustic generator according to the second aspect of the present invention, in
the panel-type acoustic generator according to the first aspect, the thicknesses of the pair of
diaphragms are not identical at opposite positions. It is characterized.
[0017]
A panel-type acoustic generator according to a third aspect of the present invention is
characterized in that, in the panel-type acoustic generator according to the first aspect, the
damping member supports the amplifier by point contact.
[0018]
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A panel-type acoustic generator according to a fourth aspect of the present invention is
characterized in that, in the panel-type acoustic generator according to the first aspect, the
damping member is made of a damping material.
[0019]
As the damping material, any material that absorbs vibrational energy can be used without
particular limitation.
For example, a homogeneous and vibration energy absorbing material made of foamed
polyurethane, foamed resin such as foamed polystyrene, synthetic rubber such as SBR or NBR, or
natural rubber is used.
[0020]
In the panel type sound generating apparatus according to the first aspect of the present
invention, an exciter is provided between a pair of diaphragms disposed opposite to each other,
and an amplifier held by a damping member is interposed between the pair of diaphragms. Since
the interiors are integrally integrated, the manufacturing process is simplified, and the labor can
be saved.
In addition, it is possible to reduce the size and the thickness, and to save the installation space,
and can be a stand-alone type or a hanging structure from a wall or a ceiling.
[0021]
Further, since the amplifier is held between the pair of diaphragms by the damping member, the
vibration transmitted from the diaphragm is suppressed by the damping member, and the
amplifier is suppressed from vibrating.
Therefore, it is possible to generate a clear sound over a long period of time by eliminating
problems such as damage to parts such as an electronic substrate constituting the amplifier due
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to vibration or disconnection of a lead wire.
[0022]
In the panel-type acoustic generator according to the second aspect of the present invention,
since the thicknesses of the pair of diaphragms are non-identical at opposite positions, for
example, the thicknesses are changed at opposite positions to specify. Prevents the pair of
diaphragms from resonating at the frequency of.
As a result, it is possible to prevent sudden loudness and howling.
[0023]
Furthermore, by making the thicknesses of the diaphragms irregular from one another, distortion
of sound can be suppressed, and an audible sound with a flat frequency characteristic can be
generated.
Then, it is possible to provide an excellent panel-type sound generator that produces clear sound
without variation in volume on all sides, is noisy near the speaker, and does not become difficult
to hear if it is separated from the speaker.
[0024]
In the panel type sound generating apparatus according to the third aspect of the present
invention, since the damping member supports the amplifier by point contact, the amplifier
contacts the frame with the minimum area and is transmitted from the pair of diaphragms
through the frame. Vibration is minimized by the damping member to prevent the amplifier from
vibrating.
Then, defects such as damage to parts such as an electronic substrate constituting the amplifier
and disconnection of lead wires can be eliminated, and clear sound can be generated over a long
period of time.
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[0025]
In the panel type acoustic generator according to the invention of claim 4 of the present
application, since the damping member is made of a damping material, for example, a damping
material such as expanded polystyrene foam is molded in a substantially U-shaped cross section.
By filling the lower part of the frame and storing the amplifier in this case, the amplifier is
prevented from vibrating, and defects such as damage to parts such as the electronic substrate
that constitutes the amplifier and disconnection of lead wires are eliminated, and clear Sound can
be generated over a long period of time.
[0026]
BRIEF DESCRIPTION OF THE DRAWINGS The longitudinal cross-section explanatory drawing
which shows the structure of the panel type sound generator which concerns on this invention.
FIG. 2 is a detailed explanatory view showing a portion encircled in FIG.
Detail explanatory drawing which shows the state which filled the damping material in the lower
frame part of a flame | frame, and hold | maintained the amplifier.
The longitudinal cross-section explanatory drawing which shows the panel type sound generator
of the other structure which concerns on this invention which made thickness of a pair of
diaphragms non-identical in the position which mutually opposes.
Explanatory drawing which shows the structure of the conventional self-supporting sound
generator.
[0027]
Hereinafter, an embodiment of a panel-type sound generator according to the present invention
will be described in detail with reference to the drawings.
[0028]
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FIG. 1 is a longitudinal sectional view showing the structure of a panel-type acoustic generator A
according to the present invention.
FIG. 2 is a detailed explanatory view showing a portion encircled in FIG.
[0029]
As shown in FIG. 1, in the panel-type acoustic generator A, an exciter 2 is internally provided
between a diaphragm 1a and a diaphragm 1b disposed opposite to each other in the front and
back, and the pair of diaphragms The amplifier 3 is supported by the damping member 4
between the diaphragm 1a and the diaphragm 1b and is provided narrow.
[0030]
As shown in FIG. 2, a specific internal structure of the amplifier 3 is, as shown in FIG. 2, the
diaphragm 1a and the diaphragm in the concave groove 51 of the frame 5 in which the concave
groove 51 having a substantially U-shaped cross section is formed on the top surface. The
amplifier 1b is firmly fitted to face each other, and the amplifier 3 supported by the damping
member 4 in the frame 5 is integrated with the sound generator in a state of being installed.
More specifically, as shown in the figure, the lower frame portion of the frame 5 holding the four
sides of the diaphragm 1a and the diaphragm 1b is formed into a damping member 4 such as a
triangular pyramid (or a truncated cone). The amplifier 3 is held by point contact from the lower
side and the left and right direction via the foamed polyurethane foam.
[0031]
As described above, by holding the amplifier 3 at a point contact (or in a state close to a point
contact) by a plurality of damping members 4, the amplifier 3 contacts the frame 5 with the
minimum area via the damping member 4 The vibration transmitted from the diaphragm 1a and
the diaphragm 1b through the frame 5 is suppressed by the damping member 4, and the
vibration of the amplifier 3 is suppressed.
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Then, defects such as damage to parts such as an electronic substrate constituting the amplifier 3
and disconnection of lead wires can be eliminated, and clear sound can be generated over a long
period of time.
[0032]
FIG. 3 is a detailed explanatory view showing a state in which the lower frame portion of the
frame 5 is filled with the damping material 41 itself constituting the damping member 4 in FIG. 2
and the amplifier 3 is held. As shown in FIG. 3, for example, a foamed polyurethane foam itself is
molded into a substantially U-shaped cross section and filled in the lower frame portion of the
frame 5, and the amplifier 3 is accommodated in this housing.
[0033]
By doing this, the amplifier 3 contacts the frame 5 via the damping material 41, and the vibration
transmitted from the diaphragm 1a and the diaphragm 1b through the frame 5 is suppressed by
the damping material 41, and the amplifier 3 Prevent vibration. Then, defects such as damage to
parts such as an electronic substrate constituting the amplifier 3 and disconnection of lead wires
can be eliminated, and clear sound can be generated over a long period of time.
[0034]
Further, as described above, the amplifier 3 is held by point contact from the lower side and the
left and right direction through the foamed polyurethane foam formed in a triangular pyramid
shape, and the damping of bead polystyrene foam or the like in the gap not in point contact The
material 41 may be filled. By doing this, the vibration transmitted from the diaphragm 1a and the
diaphragm 1b through the frame 5 is absorbed more effectively, preventing damage to parts
such as the electronic substrate constituting the amplifier 3, disconnection of lead wires, etc. Can
produce a clear sound over a long period of time.
[0035]
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In the above embodiment, the amplifier 3 is installed in the frame 5 provided at the lower end
portion of the diaphragm 1a and the diaphragm 1b, but according to the material of the
diaphragm 1a and the diaphragm 1b and the configuration thereof It can also be directly
installed between 1a and the diaphragm 1b. Therefore, in the specification of the present
application, the amplifier 3 installed in the frame 5 has the same meaning as the amplifier 3
installed between the diaphragm 1 a and the diaphragm 1 b.
[0036]
FIG. 4 is an explanatory vertical cross-sectional view showing a panel-type acoustic generator B
with another configuration according to the present invention in which the thicknesses of the
diaphragm 1a and the diaphragm 1b are not identical at opposite positions. As shown in FIG. 4, it
is possible to prevent the diaphragm 1a and the diaphragm 1b from resonating at a specific
frequency and changing the thickness of the both at mutually opposing positions, and thereby
preventing the generation of a large volume.
[0037]
Further, not only the thickness may be changed, but the shapes of the diaphragm 1a and the
diaphragm 1b may be changed. For example, the diaphragm 1a may be a panel having a uniform
thickness, and the inside of the diaphragm 1b may be expanded in a convex lens shape.
Alternatively, both may have a shape in which the inner side is expanded in a convex lens shape.
As described above, by making the thicknesses of the diaphragm 1a and the diaphragm 1b nonidentical at opposite positions, resonance can be prevented, and the sound quality generated
from the diaphragm 1a and the diaphragm 1b can be made clear.
[0038]
In the drawings, the inner side surfaces of the diaphragm 1a and the diaphragm 1b are described
in a straight line, but in reality, they are formed in a curved surface or an uneven shape. In this
case, it is preferable in view of appearance that the inner side surface, not the outer side surface
of the diaphragm 1a or the diaphragm 1b, is formed in a curved surface shape or an uneven
shape.
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[0039]
As described above, the panel-type acoustic generator according to the present invention can be
changed in design, and in any case, it falls within the technical scope of the present invention,
without departing from the scope of the claims.
[0040]
A Panel-type acoustic generator according to the present invention B Panel-type acoustic
generator 1 according to the present invention 1a diaphragm 1b diaphragm 2 exciter 3 amplifier
4 damping member 41 damping material 5 frame 51 groove 6 prior art Amplifier unit in 7 Sound
generator in the prior art
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