Process control by creating and sensing half-tone test patches

Details Process control by creating and sensing half-tone test patches Process control by creating and sensing half-tone test patches

1989-05-10

1991-03-12

Grimley, A. T.

Photocopying

Contact printing

Light boxes

346108, 355246, G03G 2100

Patent

active

049996738

ABSTRACT:
An apparatus which controls the parameters in a processing station of an electrophotographic printing machine having a photoconductive member. A test patch having a half tone image is recorded on the photoconductive member. The test patch is developed with developer material to form a developed half tone image on the photoconductive member. In response to the average density of the developed half tone image on the photoconductive member, the parameters of the processing station are regulated.

REFERENCES:
patent: 4560997 (1985-12-01), Sato et al.
patent: 4604654 (1986-08-01), Sakurada et al.
patent: 4662313 (1987-05-01), Jeromin et al.
patent: 4693592 (1989-09-01), Kurpan
patent: 4708459 (1987-11-01), Cowan et al.
patent: 4780744 (1988-10-01), Porter et al.
patent: 4786924 (1988-11-01), Folkins
patent: 4924263 (1990-05-01), Bares

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