Copy contrast and density control

Details Copy contrast and density control Copy contrast and density control

1980-04-04

1982-09-21

Truhe, J. V.

Photocopying

Projection printing and copying cameras

Combined with or convertible to a contact printer

355 14CH, 355 14D, 355 14E, G03G 1500

Patent

active

043504353

ABSTRACT:
For use with a copier, apparatus is provided for selecting one of a plurality of sets for adjusting the contrast and density of copies. Each set defines a particular Din/Dout response curve. The apparatus includes a stored matrix of such sets with each set having at least three different values relating to: voltage Vo applied onto the photoconductor by the primary charger, copier exposure Eo, and bias voltage V.sub.B applied to a development station electrode. The operator designates a particular set and logic and control means, adjusts Vo, Eo, and V.sub.B in accordance with the designated set values, and causes the copier to have a particular Din/Dout response curve.

REFERENCES:
patent: 2573881 (1951-11-01), Walkup et al.
patent: 3914047 (1975-10-01), Hunt, Jr. et al.
patent: 4087171 (1978-05-01), Yano
patent: 4099860 (1978-07-01), Connin
patent: 4136945 (1979-01-01), Stephens
patent: 4162848 (1979-07-01), Platt
patent: 4239374 (1980-12-01), Tatsumi et al.
patent: 4256401 (1981-03-01), Fujimura et al.
patent: 4279942 (1981-07-01), Swapceinski
Paxton Article, Electrophotographic Systems Solid Area Response Model, 22 Photographic Science and Engineering 15 (May/Jun. 1978).

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