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:
Dec. 20, 1977
Filed:
Aug. 11, 1976
Kenneth Foden Russell, Baildon, EN;
Alex Victor Garner, Leeds, EN;
The Rank Organisation Limited, London, EN;
Abstract
An electro-acoustic transducer has a piezo-electric film polymer diaphragm which is stressed to a part spherical surface and the periphery of which is clamped. Electrodes placed over the surface of the diaphragm apply an electric field transverse the plane thereof which causes elongation parallel to the plane of the diaphragm. The rim of the diaphragm is mounted in a supporting framework which forms part of an enclosure isolating one side of the diaphragm from the atmosphere. The enclosure may be evacuated to improve the performance of the transducer by avoiding problems due to the formation of standing waves within the enclosure.