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. 05, 2005
Filed:
Oct. 04, 2002
Shigeru Watanabe, Yamagata-ken, JP;
Shigeru Watanabe, Yamagata-ken, JP;
Pioneer Corporation, Tokyo, JP;
Tohoku Pioneer Corporation, Yamagata-ken, JP;
Abstract
A piezoelectric film loudspeaker comprising a diaphragm having a flexible piezoelectric film and electrodes formed on the both surfaces of the flexible piezoelectric film and a frame for supporting a side of the diaphragm, wherein said respective electrodes disposed on the both surfaces are divided into a plurality of sections. Each area of the divided electrodes is formed differently from one another, and each curvature of the film in the divided section also is formed differently from one another. Thus, the piezoelectric film loudspeaker having a predetermined area can have a broad band.