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:
Apr. 17, 2001
Filed:
Nov. 01, 1999
Naoki Sugiyama, Kanagawa, JP;
Mitsuru Seto, Kanagawa, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
An image forming apparatus of the type sequentially transferring a plurality of toner images formed on an image carrier to an intermediate image transfer body one upon the other (primary transfer) and collectively transferring them from the intermediate image transfer body to a recording medium (secondary transfer) is disclosed. The intermediate image transfer body is implemented by a roller including a metallic core, a base layer formed on the core, and a surface layer formed on the base layer. The base layer and surface layer have a total resistance between 1.57×10,&OHgr; and 1.57×10,&OHgr; for a unit length (1/cm). The surface layer has a volume resistivity between 1×10,&OHgr; cm and 1×10,&OHgr; cm. The roller is free from defective image transfer ascribable to the varying environment.