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:
May. 31, 2005
Filed:
Dec. 11, 2003
Katsuhiro Aoki, Kanagawa, JP;
Tsukuru Kai, Kanagawa, JP;
Hajime Oyama, Chiba, JP;
Osamu Ariizumi, Kanagawa, JP;
Hisashi Shoji, Kanagawa, JP;
Takashi Hodoshima, Kanagawa, JP;
Yasuo Miyoshi, Kanagawa, JP;
Katsuhiro Aoki, Kanagawa, JP;
Tsukuru Kai, Kanagawa, JP;
Hajime Oyama, Chiba, JP;
Osamu Ariizumi, Kanagawa, JP;
Hisashi Shoji, Kanagawa, JP;
Takashi Hodoshima, Kanagawa, JP;
Yasuo Miyoshi, Kanagawa, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
An image forming apparatus of the present invention includes a bias power supply for applying a bias Vto a developer carrier on which a developer is deposited. A charge potential deposited on an image carrier, which faces the developer carrier for forming a latent image thereon, is 400 V or below in absolute value. Assume that the potential of the image carrier is lowered to Vafter exposure, that a development potential is |V−V|, that the maximum set value of the development potential for development is |V−V|max, and that the development potential varies in a range satisfying relations:||max+||max×0.2||max−||max×0.2||max≦300 VThen image density varies by a width of 10% of image density corresponding to the maximum set value of the development potential or less.