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JPS58182400

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DESCRIPTION JPS58182400
[0001]
The present invention relates to a microphone configured to use a semiconductor laser as a light
source, irradiate a laser beam from the semiconductor laser to a vibrating film, and detect a
change in the intensity of the laser beam, and the purpose is a microphone unit There are two
pages in providing a microphone that can be miniaturized. In general, a microphone /
microphone configured to detect a mechanical change of a vibrating film as a change in intensity
of a laser beam uses a semiconductor laser with a strong self-effect effect as a light source, and
irradiates the vibrating film with a laser beam from this semiconductor laser. The reflected light
is returned to the laser cavity for interference to detect a change in intensity of the laser light.
FIG. 1 shows a conventional microphone unit. In FIG. 1, 1 is a semiconductor laser having a
strong self-coupling effect, 2 is a holder of the semiconductor laser 1, and also serves as a heat
sink. 3 is a diaphragm, 4 is a shield case, and 6 is a light receiving element. However, in the
microphone unit of such a configuration, the holder 2 of the semiconductor laser 1 which also
serves as a heat sinker, the semiconductor laser 1 and the light receiving element 6 are
accommodated in the microphone unit 6, so the following problems occur. was there. One is that
the semiconductor laser 1 and the light receiving element 6 are accommodated in the
microphone Unilitro, which requires a considerable space 3... Furthermore, when adding
directivity to the microphones themselves, they interfere and it is difficult to design acoustically
enough. The other is that temperature control of the semiconductor laser 1 is required to use the
semiconductor laser 1 in a more stable state, but the microphone unit 6 is large to sufficiently
control the temperature with a thermo module or the like. It is The present invention solves the
above-mentioned conventional drawbacks. The semiconductor laser, the holder thereof and the
light receiving element are separate units from the microphone unit on which the vibrating film
is supported, and the semiconductor laser in the unit is an optical fiber It is configured to be
optically coupled to the diaphragm of the microphone unit. According to this configuration, the
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semiconductor laser, the light receiving element, etc., which are easily enlarged can be
accommodated in a unit separate from the microphone unit. Therefore, the microphone unit
supporting the diaphragm can be miniaturized, and the configuration of the microphone unit.
Can be simplified and acoustic design such as the addition of directivity can be facilitated in JP-A58-182400 (2).
In addition, temperature control of the semiconductor laser can be sufficiently performed by a
thermo module or the like, and there is an advantage that the microphone output can be
stabilized. Hereinafter, the present invention will be described with reference to the drawings of
the embodiments. FIG. 2 shows an embodiment of the present invention. In FIG. 2, 10 is a
vibrating membrane, 11 is an optical fiber, 12 is a holder of an optical fiber, 13 is a shield case,
and these constitute a microphone unit 9. doing. 14 is a semiconductor laser housed outside the
microphone unit 9, 16 is a light receiving element, and 16 is a heat sink consisting of a
thermomodule, a temperature detecting element, a cooling fan, etc. These units are separate from
the microphone unit 9 Configured. In such a microphone, the semiconductor laser 14. Light
receiving element 16. Since the heat sink 16 can be housed outside the microphone unit 9, the
size can be reduced. Moreover, since the above-mentioned thing is isolate | separated from the
microphone unit 9, acoustic design, such as addition of a directivity, becomes very easy by the
microphone 5 t. Furthermore, since the microphone unit 9 is miniaturized, the frequency
characteristic of the microphone generated due to the diffraction of sound is reduced, and the
semiconductor laser 14. Since temperature compensation of the light receiving element 15 can
be performed, sufficient temperature compensation can be performed regardless of the space,
and the input / output of the microphone unit 9 can be simplified by only the optical fiber 11. As
described above in detail, according to the present invention, the semiconductor laser and the
light receiving element are separate units from the microphone uni-soto supporting the vibrating
film, and the semiconductor laser in this unit is used as the vibrating film in the microphone unit.
Since optical coupling is performed by an optical fiber, downsizing can be achieved, acoustic
design such as addition of directivity can be easily performed, and sufficient temperature
compensation can be performed regardless of space, and a stable output can be obtained. It has
the advantage of being able to retrieve
[0002]
Brief description of the drawings
[0003]
On page 6, FIG. 1 is a sectional view of a conventional microphone unit, and FIG. 2 is a block
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diagram showing an embodiment of the microphone of the present invention.
DESCRIPTION OF SYMBOLS 10 иииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии Semiconductor Laser,
15 иии и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и
ииииии
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