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Specification (1, Name of Invention
Optical non-inductive microphone element
(3, Detailed Description of the Invention Conventional dynamic microphones, due to their
construction, require a field, which has become inductive hum noise for use near high voltage
lines. Moreover, since the weak signal is sent to the amplifier by the shield line, this shield line is
also induced. It is this microphone element that eliminates these inductions, saves resources such
as nickel, cobalt, copper, etc., and reproduces it to a very high ultrasonic frequency band. This is
due to the fact that the mass of the diaphragm does not require a coil, and the structure is
extremely light in weight and the influence of the field is completely eliminated. The diaphragm 1
is painted black so as to collect light using a light mass such as extremely thin duralmin or
aluminum nitride. The mirror surface 2 is formed by coating or vapor depositing a substance
having a large reflection number such as silver powder on a triangular figure so that the amount
of light is changed by vibration. The projection lens 3 is focused so that a fixed amount of light
from the light source optical hypercable 4 bends to a mirror surface in the form of a beam. The
light receiving lens 6 is focused so that the reflected light is efficiently incident on the light
receiving hyper-cable 7. The projection of the mirror surface or the light reception from the
mirror surface is from the oblique direction, and the blocking plate 8 is removed in order to
prevent the projected light from being directly reflected without being reflected by the mirror
surface. The light converted from acoustic vibration to light quantity change passes through the
optical connector 9 and the amplification device side optical connector 10, is converted to a stain
signal by the light emission voltage conversion element 11 and is further amplified by the
amplifier 12 and large by the speaker 14 Sound EndPage: 1 1 Further, the feature of the
microphone element is that the entire periphery of the diaphragm 1 is surrounded by the
support, so external light does not enter into the element box 5, and sealing is maintained and
light is received from the mirror surface 2. Light is converted to a signal at a high "/ N. Also, by
making two sides of the triangular drawing of the mirror surface 2 into appropriate hyperbolic
lines, distortion of the support relative to the diaphragm l, incident angle, distortion due to the
light receiving angle, distortion of the light emission voltage conversion element 11, etc. Can.
(4. Brief Description of the Drawings The drawings illustrate the structure and principle of the
present invention, and FIG. 1 shows a microphone, and FIG. 2 shows a block diagram of an
amplification apparatus using the microphone. (1) diaphragm (2) mirror surface (5) microphone
element box (1 o'clock light source 14 speaker (3) EndPage: 2
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