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:
Mar. 17, 1992
Filed:
Jul. 12, 1990
Noriaki Ito, Yokohama, JP;
Akira Torisawa, Machida, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
A recording apparatus in which a stepping motor is used as a driving source to reciprocate a carriage on which a recording head is mounted and recording is executed by the recording head in accordance with the timing when the stepping motor rotates. The apparatus includes a rotational position detector to detect a rotational position of the stepping motor; a current switching circuit to switch energization currents to the stepping motor on the basis of a detection signal from the rotational position detector; a motor speed control circuit to closed loop control a rotational speed of the stepping motor through the current switching circuit; and a controller for detecting a load corresponding to the stepping motor by a speed control output from the motor speed control circuit and for controlling the motor so as to change output torque of the stepping motor in accordance with the load.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile