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:
Oct. 17, 2000
Filed:
Jan. 08, 1999
Applicant:
Inventor:
Takahiro Tamiya, Tokyo, JP;
Assignee:
Ricoh Company, Ltd., Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
G03G / ;
U.S. Cl.
CPC ...
399313 ; 399314 ; 399176 ; 361225 ;
Abstract
An image forming apparatus, such as a color image forming apparatus using a transfer roller or similar transfer electrode, and a constant current power source. The transfer roller is made of a material to which ion agents are added. The constant current power source applies the electric current to the transfer electrode so as to implement an image transfer operation. An electric resistance of the material satisfies a formula log R (Va)-log R (10.times.Va).ltoreq.0.5, such that a quality of the image transfer operation is not corrupted when a relatively little amount of toner is transferred, or a relatively large amount of toner is transferred.