Device for controlling electric potential applied to developing

Details Device for controlling electric potential applied to developing Device for controlling electric potential applied to developing

1975-06-11

1976-09-21

Stein, Mervin

Coating apparatus

With vacuum or fluid pressure chamber

118637, 427 8, G03G 1508

Patent

active

039812685

ABSTRACT:
A device for use in an electrophotographic duplicator employing a sensitive member comprising a temperature-dependent sensitive material whose static charge characteristic varies with the surface temperature thereof, the sensitive member bearing an electrostatic latent image having an image region and a background region, the device comprising a developing electrode disposed at the periphery of the sensitive member for effecting uniform development of the image region; temperature sensitive means disposed in the vicinity of the sensitive member responsive to the surface temperature of the sensitive member for generating a bias potential for the developing electrode, the developing electrode being so controlled by the bias potential that the bias potential is always maintained at a value greater than the value of the potential of the background region even when the temperature at the surface of the sensitive material decreases substantially thereby necessitating a substantial increase in the bias potential whereby little, or any, toner is deposited on the background region to thereby lessen fogging thereof.

REFERENCES:
patent: 3654893 (1972-04-01), Piper et al.
patent: 3674532 (1972-07-01), Morse
patent: 3779204 (1973-12-01), Altmann
patent: 3805739 (1974-04-01), Feldeisen et al.
patent: 3837741 (1974-09-01), Spencer
patent: 3877413 (1975-04-01), Rowell et al.

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