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. 24, 2015
Filed:
Jun. 14, 2012
Noriyuki Chino, Kawasaki, JP;
Katsuhiko Takano, Yokohama, JP;
Masaaki Naoi, Yokosuka, JP;
Shingo Horita, Kawasaki, JP;
Takeshi Uchida, Tokyo, JP;
Noriyuki Chino, Kawasaki, JP;
Katsuhiko Takano, Yokohama, JP;
Masaaki Naoi, Yokosuka, JP;
Shingo Horita, Kawasaki, JP;
Takeshi Uchida, Tokyo, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
An image forming apparatus improved in the accuracy of detecting a time period over which a laser beam is scanned. A laser beam emitted from a laser light source is deflected by a polygon mirror such that the laser beam scans a photosensitive drum. The deflected laser beam is guided onto the photosensitive drum via an imaging lens. A mode hop detection unit detects a mode hop of the laser beam. An image pulse generation section detects a main scanning magnification of an electrostatic latent image formed on the photosensitive drum. When a mode hop is detected, the main scanning magnification in a next scanning cycle is corrected using a correction value stored in a storage unit and used most lately, whereas when no wavelength variation has not detected, the main scanning magnification in the next scanning cycle is corrected using the latest correction value.