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JPH01168199

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DESCRIPTION JPH01168199
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
ultra low noise, compact, lightweight and high quality optical audio microphone used in an
electric shock magnetic field environment. [Prior Art] Conventional high sound quality
microphones include a dynamic type, a ribbon type, a capacitor type, and the like, but all of them
are types for directly converting sound waves received by a diaphragm into electrical signals.
[Problems to be Solved by the Invention] The conventional dynamic type and ribbon type
microphones are used under a bad electromagnetic environment by using a long cable because
the output voltage is low but the voltage generated is very low at several μV or less. In this case,
it is necessary to use a relay amplifier etc., it is necessary to pay attention to the location of the
relay amplifier, the maintenance of the battery, etc. and it is necessary to use a thick cable with
sufficient shielding 9 ability. The The capacitor type is to convert the vibration of the diaphragm
into a change in capacitance, and it is necessary to install an adapter near the microphone, and
the handling is as complicated as the dynamic type and the ribbon type. The present invention is
intended to solve the above problems. [Means for Solving the Problems] In the present invention,
the conversion means for converting the vibration of the sound wave into the optical signal, and
the conversion means are connected by the optical fiber and provided with the light emission
means and the light reception means. [Operation] In the above, the light emitted from the light
emitting means and transmitted by the optical fiber is modulated by the converting means for
converting the vibration of the sound wave into an optical signal to become an optical signal, and
the quaternary signal is transmitted by the optical fiber and received. Light is received by means.
As described above, since the vibration of the sound wave is converted into an optical signal and
transmitted by the optical fiber, a compact and lightweight microphone system that does not
receive any electromagnetic interference can be configured. An embodiment of the present
invention is shown in FIG. In this embodiment shown in FIG. 1, the diaphragm 1 disposed on the
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frame 2, the mirror 3 connected via the diaphragm I K IJk machine groove 5 and supported by
the support point 6, and the frame 2 A sound-to-light converter 8 comprising an optical fiber 4
having a penetrating end disposed toward the mirror 3 and a slit plate 7 having a slit disposed at
the end of the optical fiber 4. A light source 10 disposed so as to be capable of entering light
through the half mirror 9 to the other end of the optical fiber 4 and light from the other end of
the optical fiber 4 are received through the half mirror 9 A light emitting / receiving device 12 is
provided which is provided with a light receiving element 11 which is disposed as possible and to
which the optical fiber 4 is connected.
In the above, the incident light A emitted from the light emitting / receiving device 120 light
source 1 o passes through the half mirror 9, passes through the optical fiber 4, is narrowed by
the slit plate 7 of the sound-to-light converter 8 and enters the mirror 3. The mirror 3 is
connected to the diaphragm 1 via a link mechanism 5. When the diaphragm 1 vibrates back and
forth by sound waves, the vibration is transmitted to the mirror 3 and the mirror 3 moves back
and forth with the support point 6 as a fulcrum Vibrate. The incident light A is reflected by the
mirror 3, but the reflected light B is shown in FIG. 2 (+! As shown in L), when the mirror 3 is at
the neutral position, half of the light flux is incident on the optical fiber 4 and when the mirror 3
is inclined to the foremost as shown in FIG. In the case of the rear end as shown in FIG. The
reflected light B reflected by the mirror 3 and incident on the optical fiber 4 is reflected by the
half mirror 9 of the light emitting and receiving unit 12 and received by the light receiving
element 11, converted into an electric signal and amplified by a device not shown. As described
above, since the vibration of the sound wave is converted into a change in light intensity and
transmitted by the optical fiber, it is possible to configure a small-type lightweight microphone
system that is not subjected to any electromagnetic interference. Although the above incident
light and reflected light pass through one optical fiber, two optical fibers can be used to allow
incident light and reflected light to pass through different optical fibers. The present invention
comprises the conversion means for converting the vibration of a sound wave into an optical
signal, and by transmitting the optical signal through an optical fiber, a compact and lightweight
microphone system which does not receive any electromagnetic interference can be constructed.
Became.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is an explanatory view of an embodiment of the present invention, and FIG. 2 is an
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explanatory view of light reflected by the mirror of the embodiment.
DESCRIPTION OF SYMBOLS 1 ... diaphragm 2 ... frame 3 ... mirror 4 ... optical fiber 5 ... link
machine purchase 6 ... supporting point 7 ... slit plate 8 ... sound-light converter 9 ・ ・ ・ Half
Mira-10 ・ ・ ・ Light source
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