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:
Mar. 27, 2001
Filed:
Feb. 24, 1999
Fumio Nakajima, Tokyo, JP;
Citizen Watch Co., Ltd., Tokyo, JP;
Abstract
A tuning-fork sensor is formed with a piezoelectric single crystal and its drive arm,is self-excitedly vibrated by an oscillation circuit at a resonance frequency f0 in a predetermined direction. A sensor arm,also vibrates in the same direction in synchronization with the drive arm, and forcibly vibrates in the direction orthogonal to the direction of the vibration at the same frequency as f0 by a Coriolis force induced by the rotation. First sensor electrodes of the sensor arm are connected to a ground wire, a positive-input terminal of an operational amplifier forming a sensor circuit is connected to the ground wire, second sensor electrodes and a negative-input terminal are connected to each other, and the negative-input terminal and an output terminal are connected to each other through a feedback resistor