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:
Nov. 18, 1997
Filed:
Jun. 07, 1995
Eisaku Murakami, Hiratsuka, JP;
Kazuhiro Yuasa, Zama, JP;
Shuichi Endoh, Isehara, JP;
Iwao Matsumae, Musashino, JP;
Yoshiaki Tanaka, Kawasaki, JP;
Hiroshi Hosokawa, Yokohama, JP;
Mugiziroh Uno, Isehara, JP;
Hiroshi Saitoh, Ayase, JP;
Eizi Takenaka, Isehara, JP;
Toshihiro Sugiyama, Atsugi, JP;
Tetsuo Yamanaka, Tokyo-to, JP;
Satoru Komatsubara, Atsugi, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
A developing apparatus is capable of providing stable charging ability for a developer and stable transfer ability for transferring the developer to a photoreceptor for electronic photography to prevent residual positive images and stain of texture which appear on a toner image. A first toner transfer roller 23 has a core supported to be rotatable and a sheet type insulation layer wound around the outer periphery of the core. The insulation layer is made of elastic rubber in which magnetic material having a specified particle size is uniformly dispersed and the magnetic material is formed with ferromagnetic substance such as magnet and magnetized in advance. The first toner transfer roller 23 attracts toner T by actuating magnetism on the insulation layer since the magnetic material added to the insulation layer is magnetized.