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. 30, 2007
Filed:
Dec. 16, 2004
Hiroyuki Kita, Osaka, JP;
Hirokazu Uchiyama, Higahiosaka, JP;
Toshiyuki Matsunaga, Katano, JP;
Fumiyo Tojo, Gose, JP;
Hiroyuki Kita, Osaka, JP;
Hirokazu Uchiyama, Higahiosaka, JP;
Toshiyuki Matsunaga, Katano, JP;
Fumiyo Tojo, Gose, JP;
Matsushita Electric Industrial Co., Ltd., Osaka JPX, unknown;
Abstract
A piezoelectric film device has a piezoelectric film element and a power supply circuit. The piezoelectric film element is formed of a first electrode, a second electrode, and a piezoelectric film that is sandwiched between the first electrode and second electrode and has a polarization vector in the film thickness direction. The polarization vector is inverted by application of a predetermined voltage or higher through the first electrode and second electrode. The power supply circuit supplies voltage for inverting the polarization vector. The piezoelectric film has each different lattice constant depending on the direction of the polarization vector. The piezoelectric film device keeps a different displacement position corresponding to the direction of the polarization vector even when the voltage application is stopped.