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:
Aug. 09, 2016
Filed:
Mar. 26, 2013
Canon Kabushiki Kaisha, Tokyo, JP;
Mikio Shimada, Tokyo, JP;
Toshiaki Aiba, Fujisawa, JP;
Toshihiro Ifuku, Yokohama, JP;
Takanori Matsuda, Chofu, JP;
Makoto Kubota, Yokohama, JP;
Tatsuo Furuta, Machida, JP;
Jumpei Hayashi, Yokohama, JP;
CANON KABUSHIKI KAISHA, Tokyo, JP;
Abstract
Provided is a lead-free piezoelectric ceramics having enhanced mechanical quality factor (Qm) and mechanical strength. The piezoelectric ceramics, includes at least a first crystal grain and a second crystal grain. The first crystal grain has an average equivalent circle diameter of 2 μm or more and 30 μm or less. The first crystal grain includes a perovskite-type metal oxide represented by the following general formula (1) as a main component, and the second crystal grain includes a perovskite-type metal oxide represented by the following general formula (2) as a main component: (1) xBaTiO-yCaTiO-zCaZrO; and (2) x'BaTiO-y′CaTiO-z′CaZrO, provided that x, y, z, x′, y′, and z′ satisfy x+y+z=1, x′+y′+z′=1, 0≦x′≦0.15, 0.85≦y′≦1, 0≦z≦0.05, x>x′, 0<y<y′, and z>0.