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:
Nov. 29, 2016
Filed:
Jun. 21, 2012
Tatsuo Furuta, Machida, JP;
Hiroshi Saito, Kawasaki, JP;
Makoto Kubota, Yokohama, JP;
Kenichi Akashi, Kawasaki, JP;
Tatsuo Furuta, Machida, JP;
Hiroshi Saito, Kawasaki, JP;
Makoto Kubota, Yokohama, JP;
Kenichi Akashi, Kawasaki, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
A piezoelectric element that can decrease the output voltage for detection relative to the input voltage for driving without requiring a step-down circuit between a detection phase electrode and a phase comparator and an oscillatory wave motor including the piezoelectric element are provided. A piezoelectric element includes a piezoelectric material having a first surface and a second surface, a common electrode disposed on the first surface, and a drive phase electrode and a detection phase electrode disposed on the second surface. An absolute value d() of a piezoelectric constant of the piezoelectric material in a portion () sandwiched between the drive phase electrode and the common electrode and an absolute value d() of a piezoelectric constant of the piezoelectric material in a portion () sandwiched between the detection phase electrode and the common electrode satisfy d()<d(). An oscillatory wave motor includes this piezoelectric element.