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, 2020
Filed:
Aug. 28, 2018
Applicant:
Canon Kabushiki Kaisha, Tokyo, JP;
Inventor:
Jun Nagai, Abiko, JP;
Assignee:
CANON KABUSHIKI KAISHA, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G03G 15/04 (2006.01); G02B 26/12 (2006.01); G03G 15/043 (2006.01);
U.S. Cl.
CPC ...
G03G 15/04072 (2013.01); G02B 26/121 (2013.01); G03G 15/043 (2013.01); G03G 15/0409 (2013.01); G03G 15/04027 (2013.01);
Abstract
Density unevenness occurs in an output image in the scanning direction of a laser beam because the amount of the laser beam reaching the surface of the photoreceptor is different for each position in the scanning direction of the laser beam. The exposure amount (integrated light amount) per unit area on the photoreceptor is controlled to be substantially uniform by controlling the pulse widths of PWM signals according to the exposure positions of the laser beam, based on exposure amount correction data set according to the positions of the laser beam in the scanning direction.