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:
Jul. 29, 1980
Filed:
Apr. 25, 1978
Applicant:
Inventors:
John M Reynard, Framingham, MA (US);
Thomas N Carignan, Danvers, MA (US);
Richard Paglia, Carlisle, MA (US);
Joseph F Rich, Danvers, MA (US);
Assignee:
Polaroid Corporation, Cambridge, MA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04R / ; H04R / ;
U.S. Cl.
CPC ...
1791 / ;
Abstract
A method and device for significantly improving the efficiency and sensitivity of an electroacoustical transducer. A relatively inelastic vibratile diaphragm is preformed to the shape of a mating backplate prior to the time it is actually mated to said backplate. By such preforming, the efficiency and sensitivity reducing effects from a wrinkled transducer diaphragm are minimized in that said wrinkles move to a diaphragm region where they have no effect on transducer sensitivity when the backplate is subsequently mated to said diaphragm.