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. 01, 2008
Filed:
Feb. 02, 2006
Shingo Kawanishi, Sayama, JP;
Minoru Ishihara, Kawagoe, JP;
Kozo Ono, Sayama, JP;
Nihon Dempa Kogyo Co., Ltd., Tokyo, JP;
Abstract
A tuning fork type piezoelectric vibrator is provided with vibrating arms which can improve shock resistance while suppressing a CI value to a small value. A first groove (base end side) and a second groove (tip side) extend along a longitudinal direction from a base end of the vibrating arm and are formed on at least one of a front surface or a back surface of the vibrating arms. Then, a ratio L/Lwhich is the ratio of a length Lof the first groove to a length Lfrom the base end of the vibrating arm to the tip of the second groove, is set between 0.35 and 0.65, and a ratio d/Lwhich is the ratio of a space d between the first groove and the second groove to the length Lfrom the base end of the vibrating arm to the tip of the second groove, is set between 0.010 and 0.016.