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JP2008054154

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DESCRIPTION JP2008054154
An object of the present invention is to reduce weight, simplify transportation and installation
work, and improve electroacoustic efficiency. A planar speaker according to the present
invention is configured by arranging planar electrodes (13, 14) via damping members (12) on
both sides of a diaphragm (11) formed of thin film members. , 14 are made of a material having a
sound transmitting property and containing a conductive material having large internal loss and
being deformable, and preferably made of a fabric containing a gold thread or a silver thread.
[Selected figure] Figure 1
Flat speaker
[0001]
The present invention relates to a flat loudspeaker with a thin and flat diaphragm.
[0002]
Conventionally, a flat loudspeaker is known as one type of loudspeaker.
As shown in FIG. 2, this flat speaker is configured by disposing flat electrodes 2 and 3 in parallel
with predetermined gaps on both sides of diaphragm 1, respectively. The diaphragm 1 vibrates
by passing a drive current through 2 and 3 to generate a sound (see, for example, Patent
Documents 1 and 2).
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1
[0003]
And, since a flat speaker having such a configuration propagates sound by plane waves, there is
almost no attenuation due to distance, and since the sound source is wide, the feedback peak
does not concentrate on a specific frequency, causing howling It has various excellent features
such as no JP 10-178697 JP JP 2001-275187
[0004]
However, in the above-described conventional flat loudspeaker, the size of the loudspeaker is
increased and the weight thereof is increased, which restricts the installation place and also takes
a lot of time for transportation and installation work. In addition, there is a problem that the
energy loss of sound is large and it is difficult to improve the electroacoustic exchange efficiency.
[0005]
Therefore, the present invention has been made to solve the above-mentioned problems, and it is
possible to achieve weight reduction, to be free from restrictions on the installation location, to
be able to easily carry and install work, and to use electricity. An object of the present invention
is to provide a flat speaker capable of improving the acoustic efficiency.
[0006]
In order to achieve the above object, the flat speaker according to the present invention is
configured by disposing flat electrodes via damping members on both sides of a diaphragm
formed of a thin film-like member, and the flat electrodes are It is characterized in that it is made
of a material including an electrically conductive material that is acoustically transparent, has a
large internal loss, and is deformable.
[0007]
The thin film member may be a conductive film or a film in which a conductive film is attached to
an insulating film.
[0008]
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Further, the damping member may be formed of a material having sound permeability, damping
properties, and electrical insulation.
[0009]
Furthermore, the flat electrode may be formed of a woven fabric of yarns including yarns having
conductivity.
[0010]
Furthermore, the woven fabric may be a woven fabric comprising gold or silver yarn.
[0011]
Furthermore, the insulating film in the thin film member may be polyester.
[0012]
Furthermore, the damping member may be ester wool.
[0013]
According to the present invention, since the diaphragm is configured to be sandwiched and
supported by the damping member, the whole diaphragm can be uniformly vibrated in a wide
band.
Therefore, high sound pressure can be obtained, and the electroacoustic conversion efficiency
can be enhanced.
[0014]
Moreover, since a flexible member is used for the diaphragm, the damping member, and the flat
electrode, weight reduction and downsizing can be achieved, and transportation and installation
work can be easily performed.
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Furthermore, by dividing the flat electrode, the same diaphragm is used to increase the number
of control surfaces, or various shapes such as a cylindrical shape or a spherical shape other than
the flat shape, or the thickness of the flat electrode is adjusted. In this way, the braking force on
the control surface can also be weighted, so that there are no limitations on the installation
location, and it is possible to expand the application of the flat speaker, and so on, to obtain
various excellent effects. Can.
[0015]
Hereinafter, embodiments of the present invention will be described with reference to the
drawings.
Here, FIG. 1 is a schematic explanatory view showing the configuration of the flat loudspeaker
according to the embodiment of the present invention.
[0016]
In the flat speaker according to the embodiment of the present invention, the flat electrodes 13
and 14 are disposed on both sides of the diaphragm 11 formed of the thin film members via the
damping member 12 made of a flexible member. It is configured.
[0017]
The thin film member is a conductive film or a film in which a conductive film is attached to an
insulating film, and is preferably formed by vapor deposition of aluminum on a polyester film,
and the thickness thereof is about 2 to 3 μm. .
In addition to the polyester, the insulating film may be a polyethylene film, a Teflon (registered
trademark) film, or the like.
[0018]
Moreover, the damping member 12 is formed of a material having sound permeability, damping
properties, and electrical insulation, and is preferably formed of ester wool, and is formed of
another flexible member such as cotton or silk. May be
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[0019]
Furthermore, the flat electrodes 13 and 14 are formed of a material containing an electrically
conductive material that is acoustically transparent and has a large internal loss and is
deformable, and is preferably formed of a fabric including a gold thread or a silver thread. It may
be formed of a woven fabric made of yarns including other conductive yarns, such as textiles
including aluminum thread members.
[0020]
The damping member 12 is internally affixed to the planar electrodes 13 and 14 to integrate the
planar electrodes 13 and 14 with the damping member 12 or to paste the damping member 12
in a raised state inside the planar electrodes 13 and 14. You may wear it.
Alternatively, the planar electrodes 13 and 14 can be formed by using silicone rubber as the
damping member 12 and applying a conductive paint to the surface of the silicone rubber.
[0021]
Since the flat speaker having such a configuration has a so-called edgeless structure in which the
diaphragm 11 is sandwiched and supported by the damping member 12 made of a flexible
member, the entire diaphragm 11 is uniformly distributed in a wide band. Can be vibrated.
Therefore, high sound pressure can be obtained, and the electroacoustic conversion efficiency
can be enhanced.
[0022]
In addition, since flexible members are used for the diaphragm 11, the damping member 12, and
the flat electrodes 13 and 14, weight reduction and downsizing can be achieved, and
transportation and installation work can be easily performed.
[0023]
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Furthermore, by dividing the planar electrodes 13 and 14, the number of control surfaces can be
increased using the same diaphragm 11, or various shapes such as cylindrical and spherical
shapes other than the planar shape, or the planar electrode 13 can be used. , 14 can be adjusted
to weight the braking force of the control surface.
Therefore, the above-mentioned flat speaker is not restricted by the installation place, and can be
used, for example, for a large screen, a screen of a stage, a curtain, etc., and the application can
be expanded.
[0024]
And when the above-mentioned flat speaker is used for a curtain, since the flat speaker reflects
far-infrared rays from the outside, radiation cooling of the winter season can be prevented and
energy saving can be achieved.
In addition, the effect of shielding the sound can also be expected.
[0025]
It is a schematic explanatory drawing which shows the structure of the flat speaker which
concerns on embodiment of this invention.
It is a schematic explanatory drawing which shows a prior art example.
Explanation of sign
[0026]
11 diaphragm 12 damping member 13 plane electrode 14 plane electrode
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