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. 12, 1993
Filed:
Nov. 13, 1992
Applicant:
Inventor:
Fuchio Takeda, Tokyo, JP;
Assignee:
Ricoh Company, Ltd., Tokyo, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G03G / ; G03G / ;
U.S. Cl.
CPC ...
355219 ; 355214 ; 355246 ; 361225 ; 361230 ; 361235 ;
Abstract
An image forming apparatus capable of preventing a toner from depositing on non-charged part of an image carrier just after the start of an image forming operation even when implemented with a contact reversal development system and a contact charging system. A charge power source assigned to a charging roller feeds a current great enough to prevent toner deposition on the non-charged part of the image carrier to a constant voltage generation circuit which is connected to the image carrier.