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. 21, 2001
Filed:
Mar. 01, 2000
Yosuke Monji, Fukuoka, JP;
Tadayuki Kajiwara, Fukuoka, JP;
Takami Maeda, Fukuoka, JP;
Kazunori Nakamura, Fukuoka, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
An image forming apparatus has a plurality of drive motors for driving a plurality of photosensitive drums independently, a plurality of motor rotation controllers for controlling rotation and driving of the plurality of drive motors independently, a plurality of rotation phase detectors for detecting the rotation phase of each one of the plurality of photosensitive drums, a rotation phase difference calculator for calculating the rotation phase difference of the other photosensitive drums corresponding to the rotation phase of the photosensitive drum for black as the reference, a phase correction setting unit for setting the rotation phase difference in printing operation, and a phase correction controller for correcting rotation phase of the other photosensitive drums on the basis of the calculated rotation phase difference and the set rotation phase difference.