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:
Oct. 01, 2002
Filed:
Jul. 08, 1999
Hidemi Takayama, Kawasaki, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
An optical scanning apparatus includes a light source having a plurality of light-emitting portions arranged as inclined with respect to a main scanning direction, a deflector for deflecting a plurality of light beams emitted from the light source, an imaging system for guiding the plurality of light beams deflected and reflected by the deflector, onto a scanned surface, a detector arranged substantially at the same position as the scanned surface and in a normal direction to the main scanning direction. The detector detects scanning positions of the plurality of light beams and a difference between pass times of the plurality of light beams to thereby detect deviation of the scanning positions and variation of magnification of the optical scanning apparatus. A correcting device is provided for correcting drawing positions of the plurality of light beams on the scanned surface, based on the result of detection by the detector.