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:
Dec. 17, 2002
Filed:
Feb. 21, 2001
Yasushi Shimizu, Toride, JP;
Junichi Kato, Kashiwa, JP;
Hiroshi Sato, Moriya-machi, JP;
Masahiro Yoshida, Kashiwa, JP;
Hiroyuki Ohba, Toride, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
An image forming apparatus includes an image bearing member and an electrostatic image forming unit including an electrification device, which is disposed in contact with the image bearing member at an electrification location for performing injection electrification of the image bearing member. The apparatus is configured to change a peripheral speed difference between the electrification device and the image bearing member in accordance with a first period when an area of said image bearing member, which is to be an image forming area, is present in the electrification position; and a second period in which at least a particle of an area of said image bearing member, the area being a no-image area is present in the electrification position. The peripheral speed in the second period is smaller than the peripheral speed in the first period.