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DESCRIPTION JP2010199819

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DESCRIPTION JP2010199819
An object of the present invention is to provide a flat panel speaker installed on a wall or a
ceiling of a building, wherein a soundproofing device for reducing noise in an offending band
does not occupy a space other than a speaker volume. In order to achieve this object, the flat
panel speaker of the present invention is installed in a frame 19 provided with an opening, a
diaphragm 20 provided in the opening of the frame 19, and the frame 19. The flat speaker is
provided with a drive unit that is coupled to the diaphragm 20 and causes the diaphragm 20 to
vibrate, and one or more first resonance sound absorbers 18 are installed in the frame 19.
[Selected figure] Figure 1
Flat speaker
[0001]
The present invention relates to a flat panel speaker which is used by being installed on a wall or
a ceiling of a living space such as a house or an office building.
[0002]
In the conventional speaker of this type, as shown in FIG. 8, a soundproof cover is provided to
cover the back of the frame in order to reduce the sound on the back of the frame.
[0003]
That is, as shown in FIG. 8, the conventional speaker 1 is installed by vertically penetrating the
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ceiling panel 2 and installed, and the grill 3 is attached to the surface of the ceiling panel 2.
Most of the speakers including the drive unit are installed on the back side of the ceiling panel 2
and the soundproof cover 4 is designed to cover the frame 8.
[0004]
The drive unit is composed of a magnetic circuit 5 and a voice coil bobbin 7 around which the
voice coil 6 is wound.
[0005]
The speaker 1 includes a diaphragm 9, a damper 10, an edge 11 and a dust cap 12 in addition to
the drive unit and the frame 8.
The speaker 1 is connected to the ceiling panel 2 by joining the end of the opening 13 provided
in the ceiling panel 2 and the outer peripheral portion of the frame 8.
[0006]
The magnetic circuit 5 is composed of a lower plate 14, a magnet 15 and an upper plate 16.
[0007]
Such a conventional speaker is provided with, for example, a conical soundproof cover 4 formed
of a material such as a hard resin so as to cover the frame 8, thereby preventing the sound from
leaking to the back of the speaker 1 It was
[0008]
As a prior art document related to this application, the following Patent Document 1 is known.
JP 2007-96546 A
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[0009]
Since the conventional speaker 1 is provided with the soundproof cover 4 so as to cover the
outside of the frame 8, the thickness of the speaker 1 is increased by the portion of the
soundproof cover 4.
For this reason, it had the subject that installation was difficult in the general house where the
space of a ceiling and the floor of the upper floor is narrow.
[0010]
Therefore, an object of the present invention is to make it possible to easily install a speaker
provided with a soundproofing device even in a general house in which the space between the
ceiling and the floor on the upper floor is narrow.
[0011]
In order to achieve this object, the present invention provides a plate-like frame provided with an
opening, a diaphragm provided in the opening of the frame, and a diaphragm provided within the
frame and coupled to the diaphragm. And an oscillating drive, and one or more resonant sound
absorbers are installed in the frame to achieve the initial purpose.
[0012]
In the flat panel speaker of the present invention, since the resonance sound absorber for
reducing the noise in the offending band is installed in the frame, the leaked sound to the back
can be suppressed without increasing the overall thickness, so the ceiling and the upper floor It
can be installed easily even in a general house where the space with the floor is narrow.
[0013]
Embodiment 1 Hereinafter, a flat panel loudspeaker according to Embodiment 1 will be
described with reference to the drawings.
[0014]
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FIG. 1 is a cross-sectional view taken along line A-A of FIG. 2 which is a plan view of flat plate
speaker 17 in the first embodiment.
As shown in FIG. 1 and FIG. 2, the flat speaker 17 according to the present embodiment includes
a plate-like frame 19 made of iron provided with an opening, a flat plate-like diaphragm 20
provided in the opening of the frame 19, and the plate And a drive unit coupled to each of the
frame 19 and the diaphragm 20 to vibrate the diaphragm 20.
Furthermore, one or more first resonance sound absorbers 18 are provided in the bottom of the
dish-like frame 19.
Here, FIG. 1 is a view showing a state of actual use attached to a ceiling, so the frame bottom
portion is a portion positioned above the figure which is the opposite direction in this case.
[0015]
The diaphragm 20 made of thin wood that doubles as a ceiling plate is substantially flat, and in
the case of the present embodiment, the diaphragm 20 is, for example, a square having a side of
60 cm.
Therefore, the opening of the frame 19 is also rectangular, and the square diaphragm 20 is
installed in the rectangular opening of the frame 19 and is in a sealed state.
The diaphragm 20 can also be formed of another ceiling plate, for example, a resin plate of
lightweight hard material, a foamed resin plate, a metal plate or the like. In that case, different
sound quality can be enjoyed for each material of the diaphragm. Further, in the first
embodiment, the shape of the diaphragm 20 is a quadrangular shape, but may be another shape
such as a circular shape or a polygonal shape. In that case, an effect is obtained that the degree
of freedom in the design of the speaker is increased.
[0016]
The drive unit is composed of a magnetic circuit 21 installed at a central portion between the
inner bottom surface of the frame 19 and the diaphragm 20 and a voice coil bobbin 23 around
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which the voice coil 22 is wound.
[0017]
The magnetic circuit 21 is configured such that a yoke 24 is fixed at the center of the bottom of
the frame 19 and a magnet 25 and a top plate 26 are provided thereon, and a magnetic gap is
provided between the yoke 24 and the top plate 26. .
[0018]
The voice coil 22 is disposed in the magnetic gap of the magnetic circuit 21, and the voice coil
bobbin 23 around which the voice coil 22 is wound is connected to the diaphragm 20 through a
coupler 27 transmitting vibration to the diaphragm 20.
[0019]
The damper 28 has an inner peripheral side coupled to the voice coil bobbin 23, and an outer
peripheral side of the damper 28 coupled to an inner surface of an annular recess 19 a in the
frame 19 to support the voice coil bobbin 23.
[0020]
The first resonance sound absorber 18 is disposed between the annular recess 19 a in the frame
19 and the outer frame portion of the frame 19 and is mounted on the bottom of the frame 19.
[0021]
As shown in FIGS. 4 and 5, the first resonance sound absorber 18 in the present embodiment is
composed of a resin duct 18a and a hollow cabinet 18b.
[0022]
The duct 18a has a cylindrical shape open at both ends and is provided on one side of the hollow
cabinet 18b, the upper portion of the duct 18a is exposed to the air, and the lower portion is
inserted into the hollow cabinet 18b It is configured.
In addition, although the duct 18a of the present embodiment has a circular cross-sectional
shape, the same effect can be obtained even if the cross-sectional shape is rectangular, polygonal
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or the like.
[0023]
The hollow cabinet 18b is in the form of a rectangular parallelepiped and holds air therein.
Further, in the present embodiment, the hollow cabinet 18b is a rectangular parallelepiped, but
there is no restriction on the shape as long as the air can be maintained.
[0024]
Although the first resonance sound absorber 18 in the present embodiment is made of resin, it
can also be formed of a material such as wood or metal.
In the case of using a tree, it is possible to reduce the resonance sound by the resonance sound
absorber 18 itself.
When metal is used, the rigidity of the resonant sound absorber 18 can be increased, so that
breakage can be prevented.
[0025]
In the Helmholtz-type first resonance sound absorber 18, assuming that the sound velocity is c,
the cross-sectional area of the cylindrical duct 18a is S, the length of the cylindrical duct 18a is L,
and the volume of the hollow cabinet 18b is V: The resonant frequency f is determined by the
following equation.
[0026]
Resonance frequency f = (c / 2π) · (S / LV) <1/2> When the sound is reproduced from the flat
plate speaker 17, the sound wave of the resonance frequency emitted from the back side of the
diaphragm 20 is the inside of the frame 19. The air in the air chamber acts as a spring, and the
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mass of the air in the duct 18a acts as a weight to cause a single resonance.
In this case, intense air flows in and out at the duct 18a, where the molecules of air generate
frictional heat to convert acoustic energy into thermal energy, and as a result, sound is reduced.
In addition, by adjusting the cross-sectional area S and the length L of the duct 18a and the
volume V of the hollow cabinet 18b, sounds of different frequencies can be reduced.
[0027]
By installing one or more of the first resonance sound absorbers 18 inside the frame 19 as
shown in FIG. Can be reduced.
As a result, the flat speaker 17 can be installed on the ceiling where the space is narrow, and it is
possible to enjoy the music without disturbing the people on the upper floor.
[0028]
The first resonance sound absorber 18 may be formed integrally with the frame 19 in addition to
being installed on the frame 19 by bonding means such as bonding. In that case, the effects of
reducing the number of parts and the number of steps are achieved.
[0029]
Further, in the first embodiment, the drive portion is coupled to the frame 19 and the central
portion of the diaphragm 20, respectively, but may be coupled with the center shifted. In that
case, it is possible to disperse the split resonance occurring on the diaphragm 20, and to obtain
frequency characteristics in which peak dip is suppressed.
[0030]
The drive unit may be configured using any one of a conductive vibrator, a magnetostrictive
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vibrator, and an electrostrictive vibrator.
[0031]
Second Embodiment Hereinafter, a flat loudspeaker 29 according to a second embodiment of the
present invention will be described with reference to FIGS. 6 and 7.
In addition, in order to prevent complication of description, the same part as Embodiment 1
attaches | subjects the same number, and simplifies description.
[0032]
FIG. 6 is a perspective view of a flat loudspeaker 29 according to Embodiment 2 of the present
invention. In FIG. 6, the second resonance sound absorber 30 is installed outside the frame 19,
that is, on the outer bottom side of the frame 19. That is, as shown in FIG. 7, a recess 19a
projecting into the frame 19 is provided on the bottom of the frame 19, and the second
resonance sound absorber 30 is installed in the recess 19a. However, even in this state, as can be
clearly seen from FIG. 7, since the second resonance sound absorber 30 is provided within the
thickness of the frame 19, the second resonance sound absorber 30 is again It is in a state of
being substantially disposed inside. With this configuration, it is possible to reduce the sound
radiated from the flat plate diaphragm 20 to the front and coming around to the ceiling by the
second resonance sound absorber 30, and to further reduce the sound leaking to the upper floor.
it can.
[0033]
Furthermore, in the second embodiment, the second resonance sound absorber 30 is installed
outside the frame 19, but instead, a porous sound absorption plate or a length corresponding to
a quarter wavelength of the sound wave of the frequency to be reduced The same effect can be
obtained even with an acoustic tube having a diameter.
[0034]
The flat panel loudspeaker of the present invention has the effect of reducing the sound leakage
from the back to the surrounding space and suppressing the sound radiated to the next room and
the upper floor, and is useful as an acoustic device for a house, an apartment, an office or the
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like.
[0035]
A cross-sectional view of the flat panel loudspeaker according to the first embodiment of the
present invention (AA in FIG. 2) A plan view of the flat panel loudspeaker according to the first
embodiment of the present invention A perspective view of a frame of the flat panel loudspeaker
according to the first embodiment of the present invention The perspective view of the resonance
sound absorber of the flat panel speaker in the embodiment The cross section in the BB of FIG. 4
of the resonance sound absorber of the flat panel speaker The perspective view of the flat panel
speaker in the second embodiment of the present invention in the second embodiment of the
present invention Cross-sectional view of a flat panel speaker Cross-sectional view of a
conventional soundproof speaker
[0036]
DESCRIPTION OF SYMBOLS 1 speaker 2 ceiling panel 3 grille 4 soundproof cover 5 magnetic
circuit 6 voice coil 7 voice coil bobbin 8 frame 9 diaphragm 10 damper 11 edge 12 dust cap 13
opening 14 lower plate 15 magnet 16 upper plate 17 flat plate speaker 18 first resonance Sound
absorber 18a Duct 18b Hollow cabinet 19 Frame 20 Diaphragm 21 Magnetic circuit 22 Voice
coil 23 Voice coil bobbin 24 Yoke 25 Magnet 26 Upper plate 27 Coupler 28 Damper 29 Flat
panel speaker 30 Second resonance sound absorber
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