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JPH02190099

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DESCRIPTION JPH02190099
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
optical microphone, and more particularly to a high fidelity, high band optical microphone for
converting sound into an electrical signal. [Prior Art] A conventional microphone converts a
sound into an electric signal (1) converts vibration by a coil in a magnetic field (dynamic type) (2)
converts vibration by a capacitance change of a capacitor (Capacitor type) etc. [Problems to be
Solved by the Invention] However, such a conventional microphone described above has the
disadvantage that it is difficult to widen the frequency band because the portion receiving the
vibration and the portion receiving the electrical signal are integrated. . [Means for Solving the
Problems] In the optical microphone of the present invention, a mirror is integrated on the back
surface of a diaphragm that receives sound, and a light emitting element and a light receiving
element are used to optically detect the vibration of the diaphragm. It has a converter that
converts the change in light received by the light receiving element into an electrical signal. Next,
an embodiment of the present invention will be described with reference to the drawings. FIG. 1
is a longitudinal sectional view showing an embodiment of the present invention. The optical
microphone shown in FIG. 1 comprises a diaphragm 1, a mirror 2, a laser diode 3, a light
receiving section 4 and a phototransistor 6. FIG. 2 is a longitudinal sectional view showing
another embodiment of the present invention. The optical microphone shown in FIG. 2 has
substantially the same configuration as that of FIG. 1, but uses the optical fiber 5 for the
transmission path of the received light. Next, the operation of the optical microphone shown in
FIGS. 1 and 2 will be described. Sound incident from the outside is transmitted to the diaphragm
1 and simultaneously vibrates the mirror 2. These use thin and strong materials. Next, when the
laser light generated from the laser diode 3 is reflected by the mirror 2, the vibration is
modulated by the vibration [effect of the invention] The optical microphone of the present
invention converts sound into an electric signal without contacting the diaphragm. Thus, there is
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an effect that the change in the output impedance due to the frequency can be reduced because
the coil portion is not provided.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a longitudinal sectional view showing one embodiment of the present invention, and FIG.
2 is a longitudinal sectional view showing another embodiment of the present invention.
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