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US 5,333,205 AGranted
Microphone assembly
AssigneeMotorola, Inc.
InventorsHenry A. Bogut, Joseph Patino
Life of this patent
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Abstract
A microphone assembly (134) includes a movable diaphragm (124) and a linear light gradient (130) which causes the movement of diaphragm (124) to be translated into a corresponding amplitude of light to be received at a photo-detector (116). Thereby providing for a fully optical microphone assembly which is immune to radio frequency interference and resistance losses.
Claims2
A communication device assembly, comprising:
- a transmitter for transmitting information signals;
- and
- a microphone assembly coupled to the transmitter, the microphone assembly comprising:
- a microphone housing having a sound port for receiving sound waves;
- a diaphragm coupled to the microphone housing and movably responsive to said sound waves;
- a light source located within the housing for providing an optical signal;
- a reflective means coupled to the diaphragm for reflecting said optical signal in response to movement of said diaphragm;
- a variable gradient for receiving said reflected optical signal and attenuating the reflected optical signal by an amount which is related to the amount of movement experienced by the movable diaphragm;
- an optical push-to-talk (PTT) switch coupled to the microphone housing for selectively attenuating the optical signal;
- and
- a photo-detector for receiving the attenuated optical signal when the optical push-to-talk (PTT) switch is activated and converting the attenuated optical signal into an electrical signal which controls the transmitter.
8 more elements
Dependencies are inferred from the claim text.