Electrostatic image recording machine capable of multiple gradat

Details Electrostatic image recording machine capable of multiple gradat Electrostatic image recording machine capable of multiple gradat

1990-11-13

1992-09-22

Moses, Richard L.

Photocopying

Contact printing

Light boxes

355218, 355229, G03G 2100

Patent

active

051501562

ABSTRACT:
An image recording machine for producing a high quality image both in a text part and in a photograph part, i.e., a crisp (low gradation) image in a text part and a gentle (high gradation) image in a photograph part. The gradation characteristic is altered from part to part within a sheet on which the image is produced by decreasing the voltage of the photoconductive drum previously charged at a preset full voltage within a limited area. Irradiation of less intense light onto the photoconductive drum within the limited area by an array of LED elements can be used to decrease the surface voltage.

REFERENCES:
patent: 4537490 (1985-08-01), Stoudt et al.
patent: 4740818 (1988-04-01), Tsilibes et al.
patent: 4794421 (1988-12-01), Stoudt et al.
patent: 4905045 (1990-02-01), Sasaki et al.
patent: 4963933 (1990-10-01), Brownlee

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