Electrostatic recording apparatus and method for producing color

Details Electrostatic recording apparatus and method for producing color Electrostatic recording apparatus and method for producing color

1988-05-31

1990-10-02

Braun, Fred L.

Photocopying

Contact printing

Light boxes

355242, 355245, 355266, G03G 1501

Patent

active

049610945

ABSTRACT:
An electrostatic recording apparatus includes a photosensitive drum which is charged at +700 V by a first charger. Intensity of the light emitted from an LED array that is downstream from the first charger is adjusted such that a light image having strong intensity and/or a light image having weak intensity can be irradiated to the photosensitive drum. A surface voltage of a portion where the light image having weak intensity is irradiated becomes +400 V. A surface voltage of a portion where the light image having strong intensity is irradiated becomes +100 V. The photosensitive drum is charged at -400 V in the reverse polarity opposite to that of the first charger by a second charger which is arranged downstream from the LED array. As a result, electrostatic latent images of three gradations having voltages of +300 V, 0 V and -300 V respectively are formed on the photosensitive drum. The electrostatic latent images of +300 V and -300 V are respectively developed by developers with a black toner being charged in the negative polarity (-) a red toner being charged in the positive polarity (+).

REFERENCES:
patent: 3672884 (1972-06-01), Mayer
patent: 3761951 (1973-09-01), Inoue et al.
patent: 4540272 (1985-09-01), Abe et al.
patent: 4791452 (1988-12-01), Kasai et al.

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