Method and apparatus for electrically biasing developing electro

Details Method and apparatus for electrically biasing developing electro Method and apparatus for electrically biasing developing electro

1980-10-23

1984-10-16

Braun, Fred L.

Photocopying

Projection printing and copying cameras

Combined with or convertible to a contact printer

118648, 355 10, 430103, G03G 1510

Patent

active

RE0317071

ABSTRACT:
A photoconductive member is charged and radiated with a light image to produce an electrostatic image. Sensing electrodes automatically sense 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 means 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: 3707943 (1973-01-01), Matsumoto 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.

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