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:
Sep. 12, 2006
Filed:
Aug. 12, 2004
Masayoshi Nakayama, Ibaraki, JP;
Teruaki Mitsuya, Ibaraki, JP;
Hisao Okada, Ibaraki, JP;
Keisuke Kubota, Ibaraki, JP;
Takashi Rokutanda, Ibaraki, JP;
Masayoshi Nakayama, Ibaraki, JP;
Teruaki Mitsuya, Ibaraki, JP;
Hisao Okada, Ibaraki, JP;
Keisuke Kubota, Ibaraki, JP;
Takashi Rokutanda, Ibaraki, JP;
Ricoh Printing Systems, Ltd., Tokyo, JP;
Abstract
A color image forming apparatus includes a developing unit to which a developing bias with an AC component superposed is applied, wherein the DC voltage of the developing bias is adjusted to set the detected density of a solid image at a specified value, the light amount of radiation for exposing an image area having a width of a few dots adjacent to the white paper is adjusted to set the detected density of an image developed under a peripheral electric field at a specified value, and the gradation density curve is regulated by alternately adjusting the DC voltage, the light amount of radiation for exposing the image area having a width of a few dots adjacent to the white paper, and the amplitude of the AC component until the detected density of a mesh point image having an area ratio from 60 to 80% falls within a specified range.