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:
Aug. 05, 2014
Filed:
Nov. 23, 2011
Misao Furuya, Nagano, JP;
Hirohiko Yoshioka, Nagano, JP;
Daisuke Takahata, Saitama, JP;
Fumiaki Honda, Saitama, JP;
Kazuyuki Ueda, Saitama, JP;
Misao Furuya, Nagano, JP;
Hirohiko Yoshioka, Nagano, JP;
Daisuke Takahata, Saitama, JP;
Fumiaki Honda, Saitama, JP;
Kazuyuki Ueda, Saitama, JP;
Fukoku Co., Ltd., Saitama, JP;
Abstract
One embodiment provides a piezoelectric vibrator driving circuit for driving a piezoelectric vibrator, the piezoelectric vibrator having an equivalent circuit in which an LC series resonance circuit, an equivalent resistor Rx connected in series thereto and a damping capacitor Co connected in parallel to them are provided, the driving circuit is configured: to detect a driving current Iz flowing through the entire piezoelectric vibrator; to detect a damping current Iy flowing through the damping capacitor Co; to calculate a series resonance current Ix flowing through the LC series resonance circuit by subtracting the detected damping current Iy from the detected driving current Iz; and to perform a phase adjustment so that a phase difference between the calculated series resonance current Ix and a driving voltage Ve to be applied to the piezoelectric vibrator becomes approximately 0.