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:
Jul. 10, 1990
Filed:
Oct. 20, 1988
Applicant:
Inventors:
Assignee:
Canon Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01D / ;
U.S. Cl.
CPC ...
346160 ; 3461601 ; 346154 ;
Abstract
After a first image is formed on an image bearing member, the potential of the image bearing member is attenuated, and then, the image bearing member is re-charged. Thereafter, a second image is formed. The image forming apparatus includes a potential sensor for detecting the surface potential of the image bearing member, and in accordance with the output of the potential sensor, amount of potential attenuation and/or amount of re-charging is controlled so that the potential difference between the potential of the first developed portion after the re-charging and the background potential is converged into a predetermined target range.