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. 19, 2013
Filed:
Apr. 18, 2007
Katsumi Takahashi, Toride, JP;
Junichi Noguchi, Suzhou, CN;
Katsumi Takahashi, Toride, JP;
Junichi Noguchi, Suzhou, CN;
Canon Kabushiki Kaisha, , JP;
Abstract
An image forming apparatus includes a scanner motor and a rotary polygonal mirror which is driven by the scanner motor to rotate, and reflects a modulated beam emitted from a light source by a plurality of reflection surfaces. The image forming apparatus includes a rotation and carrier unit which, while rotating, carries an image formed on the basis of a laser beam reflected by the rotary polygonal mirror, a speed detection unit which detects a rotation speed of the rotation and carrier unit. The image forming apparatus includes a tracking characteristic detection unit which detects a tracking delay of the scanner motor from a target rotation speed and a control unit which controls, on the basis of the rotation speed detected by the speed detection unit and a tracking characteristic detected by the tracking characteristic detection unit, a rotation speed of the scanner motor that drives the rotary polygonal mirror.