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:
Dec. 04, 1990
Filed:
Oct. 26, 1989
Applicant:
Inventor:
Masami Higuchi, Yokohama, JP;
Assignee:
Ricoh Company, Ltd., Tokyo, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G03G / ;
U.S. Cl.
CPC ...
355246 ; 355214 ;
Abstract
An image density control for an electrophotographic copier uses a first and a second reference density pattern having a comparatively low and a comparatively high reference density, respectively. After latent images of the first and second reference density patterns have been formed on a photoconductive element, a potential sensor senses their potentials. In response to the sensed potentials, the potentials of the latent images are set at their predetermined target value. These target values are variable as desired.