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. 22, 2005
Filed:
Dec. 02, 2002
Akihiro Mitani, Toyama-ken, JP;
Hiroaki Kaida, Moriyama, JP;
Akihiro Mitani, Toyama-ken, JP;
Hiroaki Kaida, Moriyama, JP;
Murata Manufacturing Co., Ltd., Kyoto, JP;
Abstract
A piezoelectric shear resonator has a substantially rectangular-column piezoelectric element that excites a shear-vibration mode and that has opposing substantially rectangular shear strain surfaces. The shear strain surfaces each have an aspect ratio at which the electromechanical coupling factor reaches substantially a maximum value. When the vertical dimension of the shear strain surfaces is D and the horizontal dimension thereof is Le, the aspect ratio Le/D is expressed by Le/D={α·(S/S)+β}±0.3, where Sand Sare elastic compliances, α=0.27·n+0.45, β=1.09·n+0.31, and n is a positive integer.