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:
Oct. 04, 1977
Filed:
Apr. 06, 1976
Applicant:
Inventors:
Daishiro Hayakawa, Neyagawa, JA;
Kenroku Tani, Katano, JA;
Assignee:
Matsushita Electric Industrial Co., Ltd., Osaka, JA;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04R / ; H04R / ;
U.S. Cl.
CPC ...
310322 ; 310358 ;
Abstract
An ultrasonic ceramic microphone having a wide operating frequency range, including piezoelectric ceramic plates disposed on upper and lower surfaces of a metal plate, wherein the ultrasonic ceramic microphone is operated near two or three adjacent resonance frequencies and in a frequency band covering those resonance frequencies, of a fundamental wave and respective higher order harmonics of the deflection vibration of a transducer comprising the metal plate and the pair of piezoelectric ceramic plates.