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:
Aug. 30, 2011
Filed:
Jun. 25, 2009
Yuichi Tomioka, Utsunomiya, JP;
Yuichi Tomioka, Utsunomiya, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
An image forming apparatus includes photosensitive drums including one for black, light source devices, a rotary polygonal mirror having deflecting surfaces with chamfers, input optical systems, imaging optical systems and a synchronism detecting system for detecting a synchronizing light beam for determining the timing for scanning each of the photosensitive drums in a main scan direction, wherein the synchronism detecting system detects a light beam for forming an image of a color different from the black, and wherein the timing as the synchronism detecting device obtains a synchronizing signal and the timing as a light beam from the input optical system, which is at the side where the synchronism detecting device is provided, is incident on the chamfer of the deflecting surface of the rotary polygonal mirror, are at least partly overlapping.