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:
Dec. 03, 2019
Filed:
Mar. 17, 2017
Nihon Dempa Kogyo Co., Ltd., Tokyo, JP;
Shigeru Obara, Saitama, JP;
Tetsuya Sato, Saitama, JP;
Masaaki Nakahara, Saitama, JP;
Tomonori Shibazaki, Saitama, JP;
Yuki Oi, Saitama, JP;
Yuya Nishimura, Saitama, JP;
NIHON DEMPA KOGYO CO., LTD., Tokyo, JP;
Abstract
A crystal resonator includes a flat plate-shaped crystal element and excitation electrodes. The crystal element has principal surfaces parallel to an X'-axis and a Z′-axis. The X′-axis is an axis of rotating an X-axis in a range of 15 to 25 degrees around a Z-axis. The Z′-axis is an axis of rotating the Z-axis in a range of 33 to 35 degrees around the X′-axis. The excitation electrodes are formed on the respective principal. The excitation electrodes include a first region with a circular outer shape and a second region. The second region is formed at a peripheral area of the first region. The second region has a thickness thinner than the first region and has an elliptical outer shape. The elliptical shape has a long axis extending in a direction in a range of −5 to +15 degrees with respect to a direction that the X′-axis extends.