Image forming apparatus for forming positive and negative images

Details Image forming apparatus for forming positive and negative images Image forming apparatus for forming positive and negative images

1975-02-13

1976-11-09

Hix, L. T.

Photocopying

Including fiber optics

355 11, 355 14, G03G 15052

Patent

active

039907910

ABSTRACT:
In an image forming apparatus for selectively reproducing positive and negative electrostatic latent images corresponding to an original image, there is provided a photosensitive medium having an insulating layer on its surface, a first charger capable of uniformly imparting charges to the surface of the photosensitive medium, a second charger capable of acting on the photosensitive medium after the action of the first charger, projection apparatus for projecting the original image to expose the photosensitive medium to the image, a third charger open with respect to the projection-exposure of the original image by the projection apparatus and capable of acting on the photosensitive medium simultaneously therewith, a uniform exposure lamp for imparting uniform exposure to the photosensitive medium, and control circuitry for controlling the operations of the second and third chargers and the uniform exposure lamp.

REFERENCES:
patent: 3322098 (1967-05-01), Pegram
patent: 3615395 (1971-10-01), Yamaji
patent: 3761171 (1973-09-01), Fields
patent: 3844653 (1974-10-01), Kelly

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