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:
Dec. 21, 2021
Filed:
Jun. 03, 2020
Canon Kabushiki Kaisha, Tokyo, JP;
Daisuke Ishikawa, Yokohama, JP;
CANON KABUSHIKI KAISHA, Tokyo, JP;
Abstract
A stepping motor includes a slit rotating plate that rotates together with a rotor and two photo interrupters. A motor control device includes a rotation phase detection unit that acquires an output of the photo interrupter and detects a rotation phase of the rotor, and a drive waveform generation unit that generates a drive waveform of the stepping motor. An advance angle control unit performs speed control of the stepping motor by detecting an advance angle corresponding to a phase difference between the rotation phase of the rotor and the drive waveform and setting an advance angle at which a relationship between an amplitude and an advance angle of the drive waveform changes abruptly as a target advance angle to control an amplitude of the drive waveform.