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:
Apr. 04, 2017
Filed:
Jan. 07, 2016
Canon Kabushiki Kaisha, Tokyo, JP;
Yasushi Shimizu, Fujisawa, JP;
Tatsuo Furuta, Machida, JP;
Shinya Koyama, Tokyo, JP;
Hidenori Tanaka, Yokohama, JP;
Kanako Oshima, Tokyo, JP;
Makoto Kubota, Yokohama, JP;
Jumpei Hayashi, Yokohama, JP;
CANON KABUSHIKI KAISHA, Tokyo, JP;
Abstract
A piezoelectric ceramic compatibly represents both an excellent piezoelectric constant and an excellent mechanical quality factor. The piezoelectric ceramic contains a metal oxide expressed by general formula (1) shown below and Mn by not less than 0.04 weight parts and not more than 0.36 weight parts relative to 100 weight parts of the metal oxide in terms of metal. The piezoelectric ceramic includes a plurality of first crystal grains having a perovskite structure and a plurality of second crystal grains existing at grain boundaries between the first crystal grains. The second crystal grains contain at least a metal oxide expressed by general formula (2) shown below:(BaCa)(TiZr)O  (1)where 0.09≦x≦0.30, 0.025≦y≦0.085 and 0.986≦a≦1.020;(BaCa)(TiZr)O  (2)where 0≦v≦1, 0≦w≦1, 1≦b≦6, 2≦c≦19, b+2c−1≦d≦b+2c and b<c where b, c and d are integers.