The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 25, 1976
Filed:
Feb. 18, 1975
Alex Michael Brzezinski, Indianapolis, IN (US);
Joe Edward Warren, Indianapolis, IN (US);
Bell Telephone Laboratories, Incorporated, Murray Hill, NJ (US);
Abstract
A transducer in accordance with the present invention includes a cylindrical housing that is open at one end and has an inwardly extending lip at the other end, a disc shaped membrane diaphragm being supported on the lip. An annular insulator rests on the periphery of the diaphragm, and a compressible annular spring member rests, in turn, on the insulator. In addition, a back plate having a central portion for engaging the diaphragm and a perimeter portion for engaging the spring member is positioned with the central portion in juxtaposition with the diaphragm and the perimeter portion resting on the spring member. The central portion extends from the perimeter portion, and the height of the central portion is less than the height of the insulator plus the height of the spring member prior to its being compressed and greater than the height of the insulator plus the final compressed height of the spring member. Means, such as a lock ring threaded into the open end of the housing, are provided to move the back plate toward the diaphragm and thereby compress the spring member.