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:
Nov. 24, 2009
Filed:
Apr. 24, 2008
Yuichi Seki, Saitama, JP;
Yuichi Seki, Saitama, JP;
Canon Kabushiki Kaisha, , JP;
Abstract
An optical scanning apparatus includes an approximation formula determination unit, a sensitivity correction value determination unit and a bias current controller. The approximation formula determination unit determines an nth-order approximation formula and an mth-order approximation formula, which represent the sensitivity characteristic of the image carrier along the main-scanning direction thereof, from sensitivity data representing the sensitivity of each area obtained by dividing the surface of the image carrier into a plurality of areas. The sensitivity correction value determination unit determines a sensitivity correction value, which is a correction value of sensitivity in each area, from the nth-order approximation formula and mth-order approximation formula. The bias current controller controls a bias current in accordance with the sensitivity correction value. A switching current controller controls a switching current in accordance with the sensitivity correction value and a current value that is for obtaining a target amount of light.