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:
Jul. 06, 2004
Filed:
Sep. 11, 2002
Shunichi Oohara, Ushiku, JP;
Kazuhiro Wakamatsu, Hitachi, JP;
Akira Sasaki, Hitachi, JP;
Kazuo Kikuchi, Hitachi, JP;
Masahiko Saito, Kitaibaraki, JP;
Atsushi Onose, Hitachinaka, JP;
Akira Shimada, Hitachi, JP;
Masashi Yamamoto, Hitachi, JP;
Masaru Nakano, Tsukuba, JP;
Shogo Matsumoto, Ushiku, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A picture image forming apparatus including a photoreceptor belt driven by a drive device, a plurality of developing devices for forming toner picture images on the photoreceptor belt, an intermediate transfer device, to a surface of which toner picture images on the photoreceptor belt are overlappingly transferred plural times when a picture image is to be formed on a single page, and a transfer roller for pushing a sheet against the intermediate transfer device in order to transfer toner picture images to the sheet. The intermediate transfer device is an intermediate transfer belt contacted by the photoreceptor belt to be driven thereby. A photoreceptor-side roller enables contact of the intermediate transfer belt and the photoreceptor belt, and the intermediate transfer belt is trained around the photoreceptor-side roller and a transfer-side roller for pushing the sheet against the transfer roller. A diameter d2 of the transfer-side roller is smaller than a diameter d1 of the photoreceptor-side roller.