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. 09, 1991
Filed:
Jul. 12, 1990
Applicant:
Inventor:
Tadashi Takaya, Kyoto, JP;
Assignee:
Murata Manufacturing Co., Ltd., Nagaokakyo, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H04R / ; H01L / ;
U.S. Cl.
CPC ...
381190 ; 381173 ; 381186 ; 310324 ;
Abstract
A piezoelectric speaker which generates sound by vibrating a plane diaphragm using a plurality of piezoelectric drivers is disclosed. The diaphragm is formed of resin foam plates and the piezoelectric drivers are contained therein while being interposed and supported at the centers thereof. The piezoelectric drivers are divided into at least two groups which have different primary resonance frequencies.