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:
Mar. 17, 2015
Filed:
Jan. 25, 2013
Takeshi Yamashita, Osaka, JP;
Yuji Nagatomo, Osaka, JP;
Naoki Nakatake, Hyogo, JP;
Yasuhiro Fujiwara, Osaka, JP;
Takafumi Miyazaki, Osaka, JP;
Yasuhide Matsuno, Osaka, JP;
Takahiro Sanada, Osaka, JP;
Rumi Miyazaki, Osaka, JP;
Kyoko Abe, Osaka, JP;
Tomoya Adachi, Hyogo, JP;
Yoshie Iwakura, Osaka, JP;
Takeshi Yamashita, Osaka, JP;
Yuji Nagatomo, Osaka, JP;
Naoki Nakatake, Hyogo, JP;
Yasuhiro Fujiwara, Osaka, JP;
Takafumi Miyazaki, Osaka, JP;
Yasuhide Matsuno, Osaka, JP;
Takahiro Sanada, Osaka, JP;
Rumi Miyazaki, Osaka, JP;
Kyoko Abe, Osaka, JP;
Tomoya Adachi, Hyogo, JP;
Yoshie Iwakura, Osaka, JP;
Ricoh Company, Limited, Tokyo, JP;
Abstract
Provided is a color image forming apparatus that includes: image carriers that form toner image of black and other colors; an intermediate transfer body that makes contact with the image carriers; and transfer units that transfer the toner images on the image carriers to the intermediate transfer body. A line velocity difference is set between the image carriers and the intermediate transfer body. An accelerated cohesion degree of toner is equal to or larger than 54%. A linear velocity difference Xbetween the image carrier for black and the intermediate transfer body satisfies a relation of 0<X≦1.2 mm/sec. A linear velocity difference Xbetween the image carriers for the colors and the intermediate transfer body satisfies a relation of 2.1≦X≦4.0 mm/sec.