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. 27, 1981
Filed:
Jun. 20, 1979
Applicant:
Inventors:
Toyoo Okamoto, Yokohama, JP;
Masashi Kuno, Tokyo, JP;
Assignee:
Ricoh Co., Ltd., Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
G03G / ;
U.S. Cl.
CPC ...
355 / ; 118647 ; 355 10 ;
Abstract
In a bias device for a copying machine, the surface potential of the photo-sensitive member is detected and stored, a bias voltage is obtained by superposing a certain potential on the potential thus stored, the surface potential of an electrode confronting the photo-sensitive member is stored in a non-image period occurring with the photo-sensitive member, and the bias voltage is applied to the electrode in an image development period occurring with the photo-sensitive member, whereby troubles due to the residual voltage of the photo-sensitive member are effectively overcome.