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:
Jan. 08, 2019
Filed:
Sep. 13, 2016
Murata Manufacturing Co., Ltd., Nagaokakyo-shi, Kyoto-fu, JP;
Hidekazu Ono, Hamamatsu, JP;
Nobuaki Tsuji, Hamamatsu, JP;
Tsuyoshi Okami, Hamamatsu, JP;
Takashi Mizota, Hamamatsu, JP;
MURATA MANUFACTURING CO., LTD., Nagaokakyo-Shi, Kyoto-Fu, JP;
Abstract
A vibrator drive circuit is configured to drive a vibrator massin a prescribed vibration direction. The vibrator drive circuit includes a drive unit configured to drive a vibrator based on a reference signal SGof a predetermined frequency to cause the vibrator to vibrate in a vibration direction, a phase detector configured to detect a vibration waveform of the vibrator in the vibration direction and to output an output voltage Vcnt in accordance with a phase difference between reference signal SGand a vibration waveform thereof, and two capacitors each formed of a movable electrode provided in the vibrator and a fixed electrode provided to face the movable electrode, the output voltage Vcnt being applied to the fixed electrode. The phase detector is configured to adjust the output voltage Vcnt in accordance with the phase difference, thereby changing electrostatic force in each of the capacitors for controlling the phase difference to be 90 degrees.