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JPS6037515

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DESCRIPTION JPS6037515
[0001]
TECHNICAL FIELD The present invention relates to a microphone capable of directly obtaining
an optical signal from speech. Configuration of conventional example and its problems -1-] r41.
Optical information transmission using light 7. <1! 1H and 1H. In addition, although the
optical information transmission of the picture is partially put to practical use, the name 11i is
connected to the 11th destination of the epidemic 1 no C 1) 1 'to transmit the information' A>: 'J
is still practical It has not been The transmission path of the telephone C is light! Iber is moving
to 1 • I. [Note, the voice input unit converts the voice into electricity, then converts it into light to
light and transmits it. There is a problem with s: a 'of conversion efficiency. Several tens of
conventional f1 voice-to-light converters (one-four-one optical microphone "one seat") will be
described with reference to Figs. In FIG. 1, 1 is a 1'-leg laser generator and 2 is an active material
of a semiconductor sheet 1r-generator 1. l 'transparent reflector 3. / I is installed. Due to this
counter 1113.4, the active material storage 2 of the semiconductor laser 11 is linked with the jL
oscillation state. The reference numeral 5 designates the transmitted light of the semiconductor
laser generator 1, which is partially reflected by the vibrating film 6 to be reflected light 7 to be
fed back to the active substance ff2 of the semiconductor laser generation 'a1, and the light
output is detected by the photodetector. It is manipulated by the signal. Fig. 2 shows the output 1
of i. 1 Take the bamboo. FIG. 3 is a cross-sectional view of an optical microphone []] phone 2-,
which uses a photo detector 9 [a photogaeode. FIG. 4 is a block diagram of an optical
microphone and an electronic microphone. Semiconductor l No Day Generator 1 is installed at
both ends of the active substance 2! The 11 mirrors 3 and 7 always hold the resonance state. I
read this resonator as a Fabry-Perot resonator. Resonant State 1.1 Resonant at a certain
wavelength, and in the steady state is equivalent to oscillating. The transmitted light 5 from the
semiconductor laser generator 1 is partially reflected back by the vibrating film 6. If the phase of
the reflected light 7 is matched and positively fed back, an amplified oscillation output is
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obtained. This phenomenon is called laser self-coupling effect (5 coop Niskoup). The conditions
under which the oscillation output becomes maximum may be set by setting the distance
between the semiconductor laser generator 1 and the vibrating film 6 to a distance at which the
operating point reaches point P in FIG. The output thus obtained is output from the
semiconductor laser generator 1 as a light main body 8 and converted into an electric signal by
the light detector 9. The converted electrical signal is amplified by the amplifier 10. A part of the
amplified output passes through the low pass filter 12 and is previously set to -3 constant or tIIvoltage source from the voltage generator 13!
Electric jI and 1 He ◆ ◆ ☆ 14 '-("compared, over current protection + 1ia 15 through the cliff i9
rest Re IJ"-emitting (one unit 1! hiti! Jされる。 (This is the destruction prevention 11 of
semiconductor 1 software generator 1! There is C. The remaining part of the output of the
amplifier 10 is passed through the band pass filter 11 of the Hachinohe band 1) and output as
the final output /) 1), and the broken line 11 in FIG. is there. [Fig. 2 shows that the lasing
wavelength is 8300 A [g] and the vibrating film 6 is [4 m [1 :) y 9 y poly J de l de l eta l n o 1 o o
i n u s] It shows the lY + lli power of the case of -6 with goldfish applied. As can be seen from FIG.
2, even if the vibrating film 6 is slightly displaced, the semiconductor laser generator 1 is phasemodulated, the intensity is intensity-modulated, and a large light output is produced 1q.
However, the semiconductor laser generator 1 is converted electric electric moon 11 is weak! ==,
+1 or 5 affected by external noise. For this reason, there is a drawback that the transmission line
in the photodetector 9h white amplifier 10J: is not long. In addition, with a secondary
microphone (a sound-electric-one-light and a conversion 4-re. ’! i: Not, there is an interval & 'n
in the conversion motion' t /. OBJECTS OF THE INVENTION Ii: Those that eliminate the defects of
tY The purpose is to use micro-bons that can efficiently transmit the light output from the C1
semiconductor laser generator. SUMMARY OF THE INVENTION In order to achieve the above
object, a microphone according to the present invention comprises a semiconductor laser
generator, a vibrating film disposed at an appropriate distance in parallel with one light output
surface of the semiconductor laser generator, and the semiconductor The semiconductor laser
includes: a condensing lens disposed opposite to the other light output surface of the laser
generator; and an optical fiber receiving the laser light focused by the condensing lens at one end
surface, the reflected light from the vibrating film being the semiconductor laser It is configured
to transmit the change in the output of the laser beam generated by being detonated and
interfered with the cavity in the generator by the optical fiber through the condenser lens.
Description of Embodiments Hereinafter, an embodiment of the present invention will be
described with reference to the drawings. Fig. 3) is a cross-sectional view of an optical
microphone [one ring, 17 is a wedge] 1 ', and a microphone for a lens [Luns, 18 is a light) I aver.
Reference numeral 1 denotes a luminous flux from the semiconductor diode, which has the same
structure as that of the prior art.
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Also, the light output * e 41 is the same as in the conventional example. FIG. 6 is a block diagram
of an optical microphone 4 including a 1-light distribution microphone [1 phone, wherein a
portion surrounded by a broken line / hatched portion is an optical microphone "1 phone. First,
the light flux of 18 becomes radial as shown in FIG. If it continues as it is, only a part of the light
output 8 can be transmitted even if it is transmitted by the optical fiber 18, and the loss is large.
A light is collected at one point by a Toko microphone [Luns 17 having a convex C1 convex 1
nonz C] and transmitted through an optical fiber 18. Then, light is converted to electricity by the
photodiode 9 at the end of transmission. This converted electrical 13-month process is the same
as the conventional example + 1′′1 ′ 轡 轡-f-Signal line number for over current protection
IL of generator 1, in the same cable as optical fiber 18 is there. This special composite optical
fiber 18 is generally referred to as a -6-powered optical fiber. The condensing microlens 11 used
here has r of country 1 shape having a refractive index distributed on the radiation from the
center to the outer peripheral part, and has performance equivalent to that of a general curved
surface 1 nonz It is a thing. As described in detail in the invention, according to the present
invention, since an audio signal can be converted into light and this light can be directly
transmitted, highly efficient light transmission becomes possible, and the industrial utility value
of B is extremely large. 4 、 Simplification III 'of the drawing, K K KQ 第 Figure 1 is a schematic
overall configuration diagram of the conventional nine microphones, Figure 2 is an explanatory
diagram of light output v1 of the same optical microphone, and FIG. 33 is a cross section of the
same optical microphone Figure 4 and Figure 4 show an open-light microphone [1 phone and an
IC optical microphone [a block diagram of 1 board d, Figure 5 is a sectional view of a microphone
according to an embodiment of the present invention, and Figure 6 shows an inter-microphone 1
phone It is a block diagram of an optical microphone device using. DESCRIPTION OF SYMBOLS 1
... cliff conductor laser generator, 2 ... Active substance, 3 degrees = 7 -4 ... anti-t # J mirror, 6 ...
Vibration IQ, 17 ... Microphone for condensing [I lens , 18 · · · Jjl fiber optic person 1 Mori Ki 6 68-呪 一 罰
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