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:
Jan. 29, 2013
Filed:
Nov. 26, 2010
Masamichi Andoh, Nagaokakyo, JP;
Satoshi Kuretake, Nagaokakyo, JP;
Masamichi Andoh, Nagaokakyo, JP;
Satoshi Kuretake, Nagaokakyo, JP;
Murata Manufacturing Co., Ltd., Nagaokakyo-shi, Kyoto-fu, JP;
Abstract
A piezoelectric speaker that includes an electrode formed on opposing main surfaces of a piezoelectric sheet having a predetermined stretching axis and made of a chiral polymer. The electrode is divided into four electrode portions by a plurality of dividing lines extending in a radiation direction. The four electrode portions are distributed along the outer peripheral portion except for the central portion of a vibration region. Voltage is applied to the respective four electrode portions in such a manner that electric field vectors generated in the thickness direction of the piezoelectric sheet direct in opposite directions between the adjacent ones of four sheet portions of the piezoelectric sheet to which voltage is applied by the electrode portions.