Exposure and development control apparatus for electrostatic cop

Details Exposure and development control apparatus for electrostatic cop Exposure and development control apparatus for electrostatic cop

1978-01-27

1979-05-08

Moses, R. L.

Photocopying

Projection printing and copying cameras

Combined with or convertible to a contact printer

118 7, 118647, 355 8, 355 11, 355 68, 250205, G03G 1500

Patent

active

041533640

ABSTRACT:
An optical system focusses a light image of a linear portion of an original document onto a rotating photoconductive drum. The optical system scans the document so as to progressively form an electrostatic image on the drum. A scanning linear photosensor array is disposed such that the light image is incident thereon. Maximum and minimum output levels of the array are sensed, and the illumination intensity of the document and a developing bias voltage are controlled as functions thereof.

REFERENCES:
patent: 3438705 (1969-04-01), King
patent: 3914049 (1975-10-01), Basu et al.
patent: 3947117 (1976-03-01), Basu et al.

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