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:
May. 12, 2009
Filed:
Feb. 21, 2005
Atsushi Tomozawa, Osaka, JP;
Eiji Fujii, Osaka, JP;
Hideo Torii, Osaka, JP;
Panasonic Corporation, Osaka, JP;
Abstract
A piezoelectric element includes two electrode films and a layered piezoelectric film which is sandwiched between the electrode films and made of two thin piezoelectric films each having preferred orientation along the (111) plane. The two thin piezoelectric films are aggregates of columnar grains, respectively, which are continuously linked to each other. The columnar grains of the second thin piezoelectric film have a larger average cross-sectional diameter than the columnar grains of the first thin piezoelectric film. The ratio of the thickness of the layered piezoelectric film to the average cross-sectional diameter of the columnar grains of the second thin piezoelectric film is 20 to 60 inclusive.