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JPS59152793

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DESCRIPTION JPS59152793
[0001]
INDUSTRIAL APPLICABILITY The present invention relates to a microphone that can obtain an
output directly from speech. The configuration of the conventional example and its problems In
recent years, optical information transmission using light has become widespread. First, although
optical information transmission of a movie has been partially implemented, audio is converted
directly to light-( It has not been put to practical use to 4ALT of sled light information. In paper
jamming, the transmission path is shifting to optical fiber. However, the audio input unit converts
it into electricity and then converts it into light for transmission, which is a problem in terms of
conversion efficiency. On the other hand, in the case of converting voice input into light,
semiconductor laser (hereinafter referred to as laser 1-) v oscillation state 〃 temperature
(depending on this, the operating point becomes unstable and therefore stable output 〃) It is a
drawback that it can not be obtained. Hereinafter, a conventional voice-to-light converter
(hereinafter referred to as an optical microphone "g-") will be described with reference to Figs. In
FIG. 1, (1) is a laser and (2) is an active material of the laser (1), and semitransparent reflectors
(3) and (4) are installed at both ends of the laser. The active material (2) of the laser (1)
maintains a resonant state by the reflecting mirror (3) <4>. (5 is a laser (1) v transmitted light,
and is partially reflected by the vibrating film (6) '(reflected light (7) is returned to the laser
(active substance (2 8) is converted into an air signal by the light detection terminal (9). FIG. 2
shows the sled output characteristic T. FIG. 3 shows a cross section 丙 Q of the optical
microphone, and a C photodiode is used as a light detector (9). FIG. 4 is a block diagram of an
optical microphone device or circuit. The light output (8) obtained by the laser (1) and the
vibrating film (6) or the light detector (9)-(detected {circle over (1)}) the warpage output is
amplified by an amplifier. Amplifying amplifier H-t: One of the amplified outputs is C-obtained as
an output from the band pass filter αυ, Moller force passes through the low pass filter (b), and
the comparator a with the output of the base $ voltage oscillator @ , And after being compared
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here, pass through the over current protector α 防止 (return to the laser (1). The laser (1)
maintains resonance at all times by reflecting mirrors (3) and (4) installed at both ends of the
active material (2). This resonator is called a Fabry-Perot resonator. The above resonance state is
resonant at a certain wavelength and is equivalent to oscillating in a steady state. Now, from the
laser (1) to the V transmitted light (5), it is possible to have a part of the vibrating film (reflected
by the C).
If the phase of this reflected light (7) is matched and positively fed back, the amplified oscillation
output will be 1 cycle. This phenomenon is the self-coupling effect of the laser (sc. Op = Scoop).
i? The conditions under which the 3 Kf output is maximized may be set up with the laser (1)
and the vibrating film (6) at the laser (13 v) oscillation wavelength v 1/21 l-distance. The
resulting output is taken as the light output (8)-it goes out of the laser (1) (and it is converted to a
Cta signal to the light detector (9) ci4L). Here a photodetector (9) and a ladder photodiode. Laser
oscillation wavelength: 8300 angstroms. Vibration film (6) is made of 100 μm of gold deposited
on 4 microns of polyethylene terephthalate film. Fig. 2 shows the light output obtained by
Konohashi. As can be seen from FIG. 2, when the diaphragm (6) is slightly displaced, the laser (1)
is phase-modulated, and the light intensity is modulated to obtain a large C light output. In fact, it
is possible to obtain one 5 O d 13 v (υ degree) while the conventional condenser microphone V
sensitivity is −60 dB to −70 dB. FIG. 8 is a cross-sectional view of an actual light microphone, in
which 300 miflon to 40 mi fronly distance diaphragm (6) from the laser beam is installed. The C
light output is converted from the C light to salty light to the photodetector (9). First, the light
emitted from the laser (1) is partially reflected by the vibrating film (6), and is reflected by the
c'aLv laser (1) as C incident -9. If so, light output (8) is obtained as described above. The light
output (8) is converted to an electrical signal by the light detector (9) and amplified by an
amplifier 俵 1-i, j. The amplified output passes through a low pass filter and is compared with a
reference voltage from a preset reference m pressure generator Q 檜 with the comparator α →,
and the over current protector Q valley A This is to prevent the laser (1) v destruction. The other
output passes through the voice band V band pass filter 0 and is output to the output terminal att
as the final output. In the fourth set dashed line is an optical microphone. However, in the
conventional configuration such as Q described above, as shown in FIG. 5, the oscillation state of
the laser depends on temperature, so the output wavelength changes. This phenomenon is called
mode jumping. Because of the stiffness, there is a drawback that stable delivery is not obtained
4L. The cause C is that the active material (2) of the laser (1) is subjected to compressive stress
and the GaAs' (gallium arsenide) substrate shrinks, which is a racer holding property.
SUMMARY OF THE INVENTION The present invention provides a microphone which can obtain
stable light output from a laser by providing a microphone that can obtain stable light output
from the laser. According to the present invention, the microphone includes a semiconductor
laser, a vibrating film disposed parallel to the optical power surface of the semiconductor laser, a
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temperature sensor for detecting the temperature of the semiconductor laser, and the
semiconductor laser. Temperature control device section for heating or cooling the light, and the
reflected light from the vibrating film is positively fed back to the active material in the
semiconductor laser, and the output change of the semiconductor laser caused by interference is
output for semiconductor laser monitoring In addition, according to the temperature sensor
detection temperature, the semiconductor laser is heated or cooled by the temperature node
mounting method, and both are taken out from the surface. It is intended. Description of
Embodiments Hereinafter, an embodiment of the present invention will be described based on 11
drawings. FIG. 6 is a sectional view of the microphone, where (lη is a temperature sensor, (g) is a
Bertie element (thermo module), OL! Is an optical fiber, and (a) is a radiator. In addition, 7υ is a
vibration film,) is a laser, and these are the same as the configuration of the conventional
example. Also, the basic operation of light output generation is the same as in the prior art. FIG. 7
is a circuit block diagram of an optical microphone device including the above-mentioned
microphone, which is a partial microphone enclosed by a broken line. 弼 is the temperature
converted to paper pressure, and the temperature of the paper is the temperature of the
temperature 屯 ′ 屯 pressure reciprocator, and the output voltage is compared with the
reference Tu pressure from the high temperature reference voltage generator (c)). Together with
the reference pressure from the low-temperature base 4R negative pressure generator (c) and the
comparator), and further the output of the b)) is compared with the comparator, the Peltier
device LJ ) To the drive unit that controls the direction of the current flowing through the barrel.
(7) is a constant pressure generation circuit. The light output obtained by the laser (a) and the
diaphragm (a) is amplified by an optical fiber (converted to an electrical signal by an opticalelectrical converter 01 through an optical fiber 1'J and into an amplifier). One of the amplified
outputs passes through the low pass filter 91 and is compared with the θ constant voltage from
the constant direct pressure generation circuit (b) by the comparator -Q, and then the overcharge
protection device ( Pass through and return to the laser (i). The other output is output to the
output terminal □□□ via a band pass filter assisted by the 苔 芦 band. Long time operation
explanation-ダ. The operation principle of the microphone is the same as the conventional
example.
However, the sixth problem (according to the '9' 4 'iYt construction, the difference from the
conventional one is that a Bertier element (-1 temperature sensor (1' /), optical fiber Q, radiator
4) is added) . Peltier lattice is generally widely used for screw refrigeration. It is possible to
generate heat and cool by reversing the direction of the current flowing through the Bertier
system. As shown in FIG. 7, when the power is applied to the laser 4, the temperature rises. For
example, a small temperature sensor is detected by a temperature sensor consisting of a diode or
the like, and the temperature is switched with a pressure switch. The browning voltage is
compared with the reference pressure for the temperature reference and the reference pressure
for the low temperature by the comparator (4). Then compare whether the low temperature side
is working and whether the gold side or the double temperature side is operating with the
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comparator (C). -9 Control the direction of the current. If this is done, the temperature of the
laser is controlled within the temperature set at high temperature and low temperature. On the
other hand, the light output is an optical fiber ((· light-to-electric converter (turned off and
converted to an electric signal). According to the present invention, since the temperature of the
semiconductor laser can be maintained within a constant temperature range according to the
present invention, mode jumping is eliminated and stable light output is achieved. can get.
[0002]
Brief description of the drawings
[0003]
1 is a schematic overall configuration country of the conventional optical microphone, FIG. 2 is
an explanatory view of light output characteristics of the optical microphone, FIG. 8 is a sectional
view of the optical microphone, and FIG. Fig. 5 is a circuit block diagram of the optical
microphone device, Fig. 5 is a characteristic explanatory view of output wavelength change due
to temperature rise of the semiconductor laser, 6 囚 is a sectional view of the microphone in one
embodiment of the present invention, and Fig. 7 is the same microphone It is a circuit block
diagram of the optical microphone device which has
q ・ ・ ・ · · · Temperature sensor, 0 榎 ... Bertier element, e チ ェ ... Ji 1 ij 1 film, (support) · · ·
Semiconductor laser agent Yoshihiro Morimoto figure 1 figure 2 figure 2 Fig. 4 Fig. 5 [λJV 1
body L- * 7 one temperature
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