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:
Sep. 24, 2019
Filed:
May. 25, 2016
Denso Corporation, Kariya, Aichi-pref., JP;
Shohei Morikawa, Kariya, JP;
Hikaru Sasaki, Kariya, JP;
DENSO CORPORATION, Kariya, JP;
Abstract
A control circuit includes: an angular velocity calculator calculating an angular velocity of a mirror based on an angle of the mirror; a target angular velocity calculator calculating a target value of the angular velocity; a resonance frequency detector detecting a frequency of vibration of the mirror using the angular velocity and target value; a drive waveform generator generating a drive signal having sawtooth waveform; and an unnecessary vibration controller optimizing the drive signal to reduce an unnecessary vibration of the mirror based on the frequency of vibration of the mirror and providing piezoelectric elements with voltage according to the optimized drive signal. The resonance frequency detector detects the frequency of vibration of the mirror using a waveform and the target value of the angular velocity of the mirror during a duration in which the drive signal is transmitted to the unnecessary vibration controller from the drive waveform generator.