Photocopying – Projection printing and copying cameras – Combined with or convertible to a contact printer
Patent
1977-07-11
1978-12-12
Braun, Fred L.
Photocopying
Projection printing and copying cameras
Combined with or convertible to a contact printer
118DIG23, 427 15, 427 17, G03G 1510
Patent
active
041293754
ABSTRACT:
A photoconductive member utilized in a wet-type electrophotographic device is charged and radiated with a light image to produce an electrostatic image. Sensing electrode automatically sense through the developing solution the remaining potential in a portion of the electrostatic image corresponding to a background area of the original document scanned to produce the light image. In one embodiment the area is a white reference document disposed adjacent to the original document. In another embodiment a reference document is not provided and a plurality of portions of the electrostatic image are sensed. The lowest value of the sensed potential is utilized. Computing circuits compute and apply the biasing voltage to the developing electrode as a predetermined function of the sensed potential.
REFERENCES:
patent: 3611982 (1971-10-01), Coriale et al.
patent: 3782818 (1974-01-01), Smith
patent: 3788739 (1974-01-01), Coriale
patent: 3891316 (1975-06-01), Whited
patent: 3892481 (1975-07-01), Schaefer et al.
patent: 4050806 (1977-09-01), Miyakawa et al.
Eda Tadahiro
Miyakawa Seiichi
Braun Fred L.
Jordan Frank J.
Ricoh & Company, Ltd.
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