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US Patent 7114395 Vibration detector

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Patent
Patent

Patent attributes

Patent Jurisdiction
United States Patent and Trademark Office
United States Patent and Trademark Office
Patent Number
7114395
Date of Patent
October 3, 2006
Patent Application Number
10470997
Date Filed
February 8, 2002
Patent Primary Examiner
Hezron Williams
Hezron Williams
Patent abstract

A small photodetector type microphone (10) exhibiting excellent directivity without requiring any mirror surface. A diaphragm (27) vibrates in response to a sound pressure. An optical waveguide (28) is formed along the diameter of the diaphragm (27) and integral vibration of the optical waveguide (28) and the diaphragm (27) causes a variation in the quantity of light leaking from the optical waveguide (28) to the outside thus causing a variation in the quantity of light being transmitted across the optical waveguide (28). The optical waveguide (28) has one end side for introducing light into a light emitting elements (20) and the other end side for delivering light to a light receiving element (24). The light receiving element (24) outputs an electric signal related to the quantity of incident light.

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