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:
Mar. 24, 2015
Filed:
May. 07, 2010
Akiko Fujise, Osaka, JP;
Toshiyuki Matsumura, Osaka, JP;
Akiko Fujise, Osaka, JP;
Toshiyuki Matsumura, Osaka, JP;
Abstract
A piezoelectric acoustic transducer () of the present invention includes a lower frame (), a lower speaker circuit (), an upper frame (), an upper speaker circuit (), and a surround (). The upper speaker circuit () has a piezoelectric diaphragm () in which piezoelectric elements (), each having a structure that flat plate electrodes are disposed on top and bottom of a piezoelectric member, are mounted on top and bottom surfaces of a board (). The lower speaker circuit () has a piezoelectric diaphragm () in which piezoelectric elements (), each having the same structure, are mounted on a top surface and a bottom surface of a board (). The piezoelectric diaphragms () are coupled to each other via coupling members (). At an application of a voltage, the piezoelectric diaphragms () are caused to curve in directions opposite to each other. Having this structure, the piezoelectric acoustic transducer () has an increased displacement in a thickness direction thereof, and thereby achieving high quality sound with space-saving.