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:
Feb. 13, 2018
Filed:
May. 28, 2015
Stanley Electric Co., Ltd., Meguro-ku, Tokyo, JP;
Takanori Aimono, Tokyo-to, JP;
STANLEY ELECTRIC CO., LTD., Tokyo, JP;
Abstract
In a driver for driving an optical deflector including a mirror, a piezoelectric actuator and a piezoelectric sensor adapted to sense vibrations of the piezoelectric actuator, a saw-tooth voltage generating unit; a combined saw-tooth voltage generating unit; and a control unit, the control unit applies a saw-tooth voltage and its inverted voltage to the piezoelectric actuator; performs a low-pass filtering process using a cut-off frequency upon a sense voltage; calculates a half period of fluctuations included in a low-pass-filtered saw-tooth voltage; combines the low-pass-filtered saw-tooth voltage with a delayed low-pass-filtered saw-tooth voltage; and to applies a combined saw-tooth voltage and its inverted voltage to the piezoelectric actuator.