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:
Apr. 20, 2010
Filed:
Apr. 13, 2007
Makoto Hirota, Ebina, JP;
Takashi Yamamuro, Ebina, JP;
Shigeru Inaba, Ebina, JP;
Shota Oba, Ebina, JP;
Akihiko Noda, Ebina, JP;
Yoshifumi Ozaki, Ebina, JP;
Makoto Hirota, Ebina, JP;
Takashi Yamamuro, Ebina, JP;
Shigeru Inaba, Ebina, JP;
Shota Oba, Ebina, JP;
Akihiko Noda, Ebina, JP;
Yoshifumi Ozaki, Ebina, JP;
Fuji Xerox Co., Ltd., Tokyo, JP;
Abstract
An image forming apparatus includes an image carrier that carries a latent image; a charging device that charges the image carrier with a charging voltage having an AC component; and a roller that carries a developer to be supplied to the image carrier in a developing position, with a surface of the roller provided with axially-formed grooves, the frequency of the AC component of the charging voltage and the number of the grooves provided on the roller being set so that non-uniformity in density of an output image becomes invisible, caused by interference between the frequency of the AC component of the charging voltage and the frequency at which the grooves pass the developing position.