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:
Jan. 13, 2015
Filed:
Nov. 20, 2013
Canon Kabushiki Kaisha, Tokyo, JP;
Yasuhiko Sano, Sagamihara, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
An embodiment of this invention is directed to suppressing a circuit scale and ensuring quick response in control of a DC motor. According to the embodiment, upon driving the motor to feed roll paper, the current value supplied to drive the motor is compared with a target value for PWM-control. A value representing the comparison result is counted for a PWM-control signal of one cycle. The output tendency of the comparison result is checked based on an obtained count in every cycle of the signal, and the tendency is encoded. The code values are stored for a predetermined number of cycles of the signal. The code values stored in both the first period and the second period longer than the first period are checked in regard to the past tendency of PWM-control, and the signal is adjusted.