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:
Jan. 01, 2008
Filed:
Jun. 13, 2005
Osamu Ariizumi, Kanagawa, JP;
Masahide Yamashita, Tokyo, JP;
Koji Suzuki, Kanagwa, JP;
Yasushi Koichi, Kanagawa, JP;
Shigekazu Enoki, Kanagawa, JP;
Kumiko Hatakeyama, Kanagawa, JP;
Koichi Kato, Kanagawa, JP;
Toshiyuki Kabata, Kanagawa, JP;
Jun Yura, Kanagawa, JP;
Osamu Ariizumi, Kanagawa, JP;
Masahide Yamashita, Tokyo, JP;
Koji Suzuki, Kanagwa, JP;
Yasushi Koichi, Kanagawa, JP;
Shigekazu Enoki, Kanagawa, JP;
Kumiko Hatakeyama, Kanagawa, JP;
Koichi Kato, Kanagawa, JP;
Toshiyuki Kabata, Kanagawa, JP;
Jun Yura, Kanagawa, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
An image forming apparatus of includes a developing device bifunctioning as a cleaning device for collecting toner grains left on a photoconductive drum after the transfer of a toner image from the drum to a paper sheet or similar image transfer medium. In the event of toner collection, a DC voltage is applied that causes the residual toner to move from the drum toward a developing sleeve. A main-pole magnet generates, at a position where the developing sleeve faces the drum, a magnetic field of between 100 mT and 200 mT in a direction normal to the surface of the sleeve.