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. 03, 2007
Filed:
Jun. 29, 2005
Mitoshi Umeki, Saitama, JP;
Mitoshi Umeki, Saitama, JP;
Nihon Dempa Kogyo Co., Ltd., Tokyo, JP;
Abstract
A crystal unit for high frequency use includes: a crystal blank having a central portion that is used as a vibration region and a peripheral portion that surrounds the central portion and that is provided with a greater thickness than the central portion; a pair of excitation electrodes provided respectively on both major surface of the crystal blank in said vibration region; a pair of extending electrodes led out from the pair of excitation electrodes toward ends of the crystal blank, respectively; and an opposition region in which the extending electrodes overlap each other with the crystal blank interposed. Each of the extending electrodes connects to a corresponding excitation electrode over at least half of the outer circumference of the excitation electrode, and the thickness of the crystal blank is greater in the opposition region than in the vibration region.