Method for forming an electrostatic latent image

Details Method for forming an electrostatic latent image Method for forming an electrostatic latent image

1979-04-02

1982-01-19

Welsh, John D.

Radiation imagery chemistry: process, composition, or product th

Electric or magnetic imagery, e.g., xerography,...

Electrostatic image transfer

430 55, 430126, G03G 1322

Patent

active

043117775

ABSTRACT:
A method of producing an electrostatic latent image of an original includes the successive steps of positioning of face-to-face virtual contact a photoconductor layer superimposed on a conductive backing electrode and a dielectric layer superimposed on another conductive backing electrode, applying a direct current voltage of a first polarity between the electrodes of a value to produce gas discharges between the layers to charge the dielectric layer while the photoconductor layer is unexposed to any light, short circuiting the electrodes while exposing the full surface of the photoconductor layer to light until the electric field across the photoconductor layer is substantially zero and applying a voltage between the electrodes at a polarity opposite to the first polarity while exposing the photoconductor layer to the light image of an original. The dielectric layer may be a coating on a conductive copy paper or may be a driven endless conductive belt along which are located an image developing device, an image transfer device and a device for erasing residual toner and charges from the belt dielectric layer.

REFERENCES:
patent: 2825814 (1958-03-01), Walkup
patent: 2904431 (1959-09-01), Moncrieff-Yeates
patent: 2937943 (1960-05-01), Walkup
patent: 3057719 (1962-10-01), Byrne et al.
patent: 3322539 (1967-05-01), Redington
patent: 3502408 (1970-03-01), Brodie
patent: 3598579 (1971-08-01), Robinson

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