Method of controlling surface potential of photoconductive eleme

Details Method of controlling surface potential of photoconductive eleme Method of controlling surface potential of photoconductive eleme

1987-12-04

1989-09-26

Grimley, A. T.

Photocopying

Contact printing

Light boxes

355327, 430 30, 430902, G03G 1500

Patent

active

048704601

ABSTRACT:
A control method applicable to an electrophotographic copier for protecting the background of copies against smears due to a residual potential on a photoconductive element. Before a visible pattern is produced, the photoconductive element is charged by a lower potential than a charging potential which is adapted to form a document image and, then, it is discharged. Potential remaining on the photoconductive element which has been discharged is developed to produce the visible pattern, and the density of this pattern is optically detected. Based on the density level of the visible pattern detected, at least one of a developing bias potential, a charging potential and an exposing potential which are to form a document image is corrected. In the event of producing the visible pattern, the potential remaining on the photoconductive element is developed by a developing bias potential which has been corrected on the bias of visible pattern density level detected immediately before. In a multi-color electrophotographic copier which uses a plurality of colors of toner, the visible pattern is produced by using one particular color of toner which is advantageously black toner.

REFERENCES:
patent: 4312589 (1982-01-01), Brannan et al.
patent: 4372674 (1983-02-01), Yukawa et al.
patent: 4484811 (1984-11-01), Nakahata et al.
patent: 4551005 (1985-11-01), Koichi
patent: 4583835 (1986-04-01), Harada
patent: 4619522 (1986-10-01), Imai
patent: 4632537 (1986-12-01), Imai
patent: 4734740 (1988-03-01), Fujii et al.

Affiliated with

Also associated with

Rating

Method of controlling surface potential of photoconductive eleme does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method of controlling surface potential of photoconductive eleme, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of controlling surface potential of photoconductive eleme will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-190533