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. 19, 2005
Filed:
Jun. 05, 2002
Masami Yamanaka, Akashi, JP;
Motoyuki Adachi, Akashi, JP;
Akio Chiba, Sayama, JP;
Kozo Ono, Sayama, JP;
Masami Yamanaka, Akashi, JP;
Motoyuki Adachi, Akashi, JP;
Akio Chiba, Sayama, JP;
Kozo Ono, Sayama, JP;
Yamata Scale Co., Ltd., Akashi, JP;
Nihon Dempa Kogyo Co., Ltd., Akashi, JP;
Abstract
Excitation electrodes are respectively affixed to central portions of both surfaces of a long plate-shaped AT-cut crystal resonator, the central portion starts a thickness shear oscillation in the length direction of the crystal resonator when an electric signal is applied to the central portion of the crystal resonator through the excitation electrodes. And, channel-shaped, half-circular-shaped, or trapezoid grooves in cross-section are respectively formed in the plate width direction on middle portions between the center portion and end portions of the crystal resonator. These grooves are formed so as to be symmetrical with respect to a thicknesswise central position of the crystal resonator through a well-known etching technique such as photo-etching and the like.