Test patch generation utilizing system scan optics

Details Test patch generation utilizing system scan optics Test patch generation utilizing system scan optics

1985-03-18

1986-10-21

Grimley, Arthur T.

Photocopying

Projection printing and copying cameras

Combined with or convertible to a contact printer

355 14E, 355 8, G03G 1500

Patent

active

046182489

ABSTRACT:
An electrophotographic printing machine utilizing an optical illumination and scanning system which, besides performing the conventional document reproducing function, is adapted to operate in a machine test mode. In the test mode, target strips of varying density affixed to the bottom of a platen are projected as test patch images onto the surface of a photoreceptor. The voltage levels of these patches are then measured and used to adjust variable parameters to maintain optimum operation.
The optical system, when operating in the test mode, sequentially and selectively illuminates various of the test patches while control means selectively varies the illumination levels.

REFERENCES:
patent: 4178095 (1979-12-01), Champion et al.
patent: 4215930 (1980-08-01), Miyakawa et al.
patent: 4277162 (1981-07-01), Kasahara et al.
patent: 4306804 (1981-12-01), Sakamoto et al.
patent: 4313671 (1982-02-01), Kuru
patent: 4318610 (1982-03-01), Grace
patent: 4348099 (1982-09-01), Fantozzi
patent: 4377338 (1983-03-01), Ernst

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