Three color electrostatographic process

Details Three color electrostatographic process Three color electrostatographic process

1979-11-23

1981-07-28

Martin, Jr., Roland E.

Radiation imagery chemistry: process, composition, or product th

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

To produce color reproduction

430 45, 430 46, 430 31, 430 57, G03G 1301

Patent

active

042810515

ABSTRACT:
A photoconductive material (11) is provided which has first and second photoconductive layers (13), (14) of different spectral sensitivities. The material (11) is charged at least twice to form a stratified charge pattern of opposite polarities. A color light image of an original document (24) is radiated onto the material (11) to form an electrostatic surface potential pattern having high and low potential areas of one polarity and another area of the opposite polarity corresponding to three respective colors. The areas are developed separately using toners of the three respective colors to form a three color toner image which is transferred to a copy sheet (36). One of the colors may be black.

REFERENCES:
patent: 2962375 (1960-11-01), Schaffert
patent: 3647427 (1972-02-01), Hanada et al.
patent: 3679405 (1972-07-01), Makino et al.
patent: 3692519 (1972-09-01), Takahashi
patent: 3775106 (1973-11-01), Tamai et al.
patent: 3795513 (1974-03-01), Ciuffini
patent: 3801317 (1974-04-01), Tanaka et al.
patent: 3844783 (1974-10-01), Matsumoto et al.
patent: 3884686 (1975-05-01), Bean
patent: 4039831 (1977-08-01), Lehmann
patent: 4078929 (1978-03-01), Gundlach
Schaffert, "Increasing the Sensitivity of Xerographic Photoconductors", IBM Tech. Discl. Bull., vol. 6, No. 10, Mar. 1964, p. 60.

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