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:
Sep. 03, 2013
Filed:
Sep. 01, 2011
Manabu Ishikawa, Sayama, JP;
Kenji Shimao, Sayama, JP;
Hiroyuki Sasaki, Sayama, JP;
Nihon Dempa Kogyo Co., Ltd., Tokyo, JP;
Abstract
To provide an AT-cut quartz-crystal vibrating piece in which size of the vibrating unit is adjusted to appropriate value, so that the unnecessary vibration is inhibited and degradation of its characteristics is prevented. A mesa-type AT-cut quartz-crystal vibrating piece for vibrating at 38.400 MHz comprising a rectangular excitation unit () and a peripheral region () formed on the periphery of the excitation unit and having a thickness less than the thickness of the excitation unit, is represented by the following equation: Mx/Gx=0.09×n−0.06 (n: natural number) . . . (1). Length of a crystallographic x-axis direction of the excitation unit is defined as Mx (mm) and length of the crystallographic x-axis direction of the peripheral region and excitation unit is defined as Gx (mm).