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JP2010206338

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Notice
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 JP2010206338
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. A frame (19) having an opening, a
diaphragm (20) provided at the opening of the frame (19), and a drive installed in the frame (19)
and coupled with the diaphragm (20) to vibrate the diaphragm (20). The first porous soundabsorbing plate 18 is installed in the frame 19 at a constant distance from the bottom of the
frame. [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 ceiling-mounted 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 ceiling-mounted speaker 1 is installed by vertically
penetrating the ceiling panel 2 and the grill 3 is attached to the surface of the ceiling panel 2.
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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 ceiling mounted 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 ceiling-mounted 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 periphery 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]
In such a conventional ceiling-mounted speaker, for example, a conical soundproof cover 4
formed of a material such as hard resin is provided so as to cover the frame 8 so that sound is
generated on the back of the ceiling-mounted speaker 1 It was preventing it from leaking.
[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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2
[0009]
The conventional ceiling-mounted speaker 1 is provided with the soundproof cover 4 so as to
cover the outside of the frame 8, so the thickness of the ceiling-mounted speaker 1 is increased
by the amount 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, according to the present invention, a dish-like frame provided
with an opening, a diaphragm provided at the opening of the frame, and a diaphragm provided in
the frame and coupled to the diaphragm, A flat panel speaker comprising a drive unit for
vibrating a diaphragm, wherein the first porous sound absorbing plate is installed in the frame at
a constant distance from the bottom surface inside the frame, thereby achieving the intended
purpose To achieve
[0012]
In the flat panel speaker of the present invention, the first porous sound absorbing plate for
reducing the noise in the offending band according to the Helmholtz resonance principle is
installed in the frame, so the cover for sound leakage prevention becomes unnecessary, and as a
result As the space between the ceiling and the floor of the upper floor is narrow, it will be easy
to install even in a general house.
[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.
[0015]
As shown in FIG. 1 and FIG. 2, the flat speaker 17 in the present embodiment includes an iron
dish-like frame 19 having an opening and a flat diaphragm 20 provided in the opening of the
frame 19. The drive unit is installed in the dish-like frame 19 and is connected to each of the
frame 19 and the diaphragm 20 to vibrate the diaphragm 20.
Furthermore, in the dish-like frame 19, a first porous sound-absorbing plate 18 is installed at a
fixed distance from the bottom inside the frame 19.
[0016]
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.
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[0017]
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
which the voice coil 22 is wound.
[0018]
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, with a magnetic gap
between the yoke 24 and the top plate 26 There is.
[0019]
The voice coil 22 is disposed in the magnetic gap of the magnetic circuit 21, and the voice coil
bobbin 23 for winding the voice coil 22 is connected to the diaphragm 20 through the cylindrical
coupler 27 transmitting the vibration to the diaphragm 20. ing.
[0020]
The damper 28 is connected at its inner peripheral side to the voice coil bobbin 23 and at its
outer peripheral side is connected to an annular recess 19 a provided from the bottom surface of
the plate-like frame 19 toward the opening to support the voice coil bobbin 23 doing.
[0021]
FIG. 3 is a perspective view of the first porous sound absorbing plate 18 installed in the flat panel
speaker 17.
The first porous sound-absorbing plate 18 is formed of a square substrate 18a conforming to the
shape of the frame 19, a plurality of first holes 18b provided in the substrate, and a first hole
18b provided in the central portion of the substrate 18a. It consists of a large second hole 18c.
The substrate 18a is made of plywood having a thickness of 3 mm or more and 30 mm or less,
and the first hole 18b is formed in a circle having a diameter of 4 mm or more and 60 mm or
less.
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[0022]
As shown in FIG. 4, the first porous sound-absorbing plate 18 is installed at a fixed distance from
the bottom surface of the inside of the frame 19, and the second holes 18 c provided in the
substrate 18 a are from the bottom surface of the frame 19. It is installed in combination with
the outer periphery of an annular recess 19a facing the opening (in contrast to FIG. 1, the
opening of the frame 18 faces upward, so it looks like a protrusion).
[0023]
As shown in FIG. 5, the first porous sound-absorbing plate 18 is spaced from the bottom surface
of the inside of the frame 19 by a fixed distance, and an air layer 31 is provided between the
substrate 18 a and the bottom surface of the frame 19.
The air layer 31 communicates with the first hole 18 b.
[0024]
When sound is reproduced from the flat plate speaker 17, the first hole 18b and the air layer 31
work as a Helmholtz type resonance sound absorber, and from the back side of the diaphragm
20 to the first hole 18b of the first porous sound absorbing plate 18 The sound wave of the
resonance frequency of the resonance sound absorber, which has been made incident, undergoes
intense air circulation in the portion of the first hole 18b, and a sound absorption phenomenon
occurs in which sound energy is converted into heat energy. Sound leakage to the back is
reduced.
[0025]
Further, since the frequency to be reduced is determined by the volume (V) of the air layer 31,
the area (S) of the first hole 18b, and the thickness (T) of the substrate 18a, the above three
factors are changed. It is possible to absorb the leaked sound of a plurality of frequency bands.
[0026]
In the present embodiment, the shape of the first hole 18b is circular, but the shape is not
particularly limited as long as the area of the first hole is the same.
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[0027]
Furthermore, in order to enhance the sound absorbing effect, a porous material such as glass
wool can be lined between the first porous sound absorbing plate 18 and the frame 19.
[0028]
Further, in the present embodiment, the drive portion is coupled to the frame 18 and the central
portion of the diaphragm 20, respectively, but may be coupled at an offset center.
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.
[0029]
The drive unit may be configured using any one of an electrodynamic vibrator, a
magnetostrictive vibrator, and an electrostrictive vibrator.
[0030]
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.
[0031]
FIG. 6 is a perspective view of a flat loudspeaker 29 according to Embodiment 2 of the present
invention.
In FIG. 6, the second porous sound-absorbing plate 30 is provided with a plurality of third holes
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30 b in an annular substrate 30 a, and is installed on the outside of the frame 19, that is, the
outer bottom surface side of the frame 19.
That is, as shown in the structural cross sectional view of FIG. 7, the second porous sound
absorbing plate 30 is provided with an annular recess 19a from the bottom surface inside the
frame 19 toward the opening, and a fixed distance from the outer bottom surface of the recess
19a. It is installed away from.
However, even in this state, as is apparent from FIG. 7, since the second porous sound-absorbing
plate 30 is provided within the thickness of the frame 19, the second porous sound-absorbing
plate 30 is in this case also in the frame 19. It is in a substantially deployed state.
With this configuration, the sound radiated from the flat plate diaphragm 20 to the front and
coming around to the ceiling can be absorbed by the second porous sound absorbing plate 30,
and the sound leaking to the upper floor can be further reduced. .
[0032]
Furthermore, although the second porous sound-absorbing plate 30 is installed on the outside of
the frame 19 in the present embodiment, a resonant sound absorber having a duct and a hollow
portion instead, or 1/4 of the sound wave of the frequency to be reduced. The same effect can be
obtained even with an acoustic tube having a length corresponding to the wavelength.
[0033]
In the second embodiment, the substrate 30a and the third hole 30b have the same features as
the substrate 18a and the first hole 18b in the first embodiment.
[0034]
The flat plate speaker according to the present invention is useful as an acoustic device for a
house, an apartment, an office or the like.
[0035]
Sectional view at AA of the plan view (FIG. 2) of the flat panel speaker according to the first
embodiment of the present invention The top view of the flat panel speaker according to the first
embodiment of the present invention The first flat panel speaker according to the present
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invention 4 is a perspective view of the porous sound-absorbing plate of the second embodiment,
and a perspective view of the frame of the flat panel speaker according to the embodiment and
the first porous sound-absorbing plate. FIG. The perspective view of a flat plate speaker The
structure sectional view of the flat plate speaker in Embodiment 2 of this invention The structure
sectional view of the conventional soundproof speaker
[0036]
Reference Signs List 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 porous Sound absorbing
plate 18a substrate 18b first hole 18c second hole 19 frame 19a recess 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 porous sound absorption Plate 30a
substrate 30b third hole 31 air layer
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