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. 04, 1992
Filed:
Nov. 16, 1990
Taneichi Kawai, Aichi, JP;
Aisin Seiki Kabushiki Kaisha, Aichi, JP;
Abstract
A device for driving a piezoelectric vibrator is comprised of an AC power supply for supplying electric power to a piezoelectric vibrator for vibration thereof, a detecting device for detecting current supplied to the piezoelectric vibrator, and a driving circuit interposed between the AC power supply and the piezoelectric vibrator so as to decrease the electric power being supplied to the piezoelectric vibrator as the current flowing therethrough increases. This structure brings a decrease in electric power being supplied to the piezoelectric vibrator when current flowing therethrough is increased during resonance of the piezoelectric vibrator, thereby enabling the restriction or regulation of the expansion and contraction of the piezoelectric vibrator while maintaining resonance thereof.