04334321 is referenced by 85 patents and cites 7 patents.

An optical fiber element of low density, low heat capacity, a large coefficient of thermal expansion, and a large Young's modulus varies in light transmissivity gradually between its ends from high transmissivity to opacity, whereby power modulated light transmitted through the fiber element is absorbed to cause a change in temperature of the fiber element and a resultant thermal expansion and contraction thereof. As a transducer in a telephone receiver, a light absorbing fiber element or group of such elements is coupled between the optical fiber waveguide in the receiver and a resiliently mounted acoustical diaphragm which is caused to respond over the audible range.

Title
Opto-acoustic transducer and telephone receiver
Application Number
6/226447
Publication Number
4334321
Application Date
January 19, 1981
Publication Date
June 8, 1982
Inventor
Seymour Edelman
9115 Glenridge Rd., Silver Spring, 20910
MD, US
Agent
Brady O Boyle & Gates
IPC
H04B 9/00
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