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:
Feb. 01, 2005
Filed:
Mar. 20, 2003
Guoqing Zhang, Minowa-machi, JP;
Masako Tanaka, Okaya, JP;
Eiji Karaki, Ina, JP;
Yukihiro Unno, Okaya, JP;
Guoqing Zhang, Minowa-machi, JP;
Masako Tanaka, Okaya, JP;
Eiji Karaki, Ina, JP;
Yukihiro Unno, Okaya, JP;
Seiko Epson Corporation, Tokyo, JP;
Abstract
The invention provides a stabilized frequency characteristic over a wide temperature range. A quartz resonating piece is provided such that an electrical axis of quartz corresponds to an X axis, a mechanical axis of the quartz corresponds to a Y axis, and an optical axis of the quartz corresponds to a Z axis. The quartz resonating piece includes a quartz plate having a side that is parallel to an X'axis set by clockwise rotation of the X axis around the Z axis by an angle equal to or greater than −5.0° and less than −1.0° or by an angle greater than +1.0° and equal to or less than 15.9°, and another side that is parallel to a Z′ axis set by clockwise rotation of the Z axis around the X′ axis by an angle in a range from 34.6° to 35.1° inclusive; or a quartz plate having a side that is parallel to the X′ axis set by clockwise rotation of the X axis around the Z axis by an angle in a range from −15.9° to −5.0° inclusive, and another side that is parallel to the Z′ axis set by clockwise rotation of the Z axis around the X′ axis by an angle in a range from 34.2° to 35.3° inclusive.