Method and means for improving maximum density and tonal range o

Details Method and means for improving maximum density and tonal range o Method and means for improving maximum density and tonal range o

1980-03-24

1983-05-31

Braun, Fred L.

Photocopying

Including fiber optics

355 3DD, 430 60, 430107, G03G 1500

Patent

active

043858236

ABSTRACT:
In a novel electrographic copying method and apparatus, a latent electrostatic image is formed on an insulating layer of an electrophotographic element and, before, during or after the formation of the latent electrostatic image, there is created a plurality of charge islands, such as by an exposure through a screen. These charge islands are distinct and in addition to any charge islands which result from the image-forming step. After establishment of the charge islands and the latent electrostatic image, the resulting charge pattern is developed with a developer which either is at least partially conductive, i.e., has a maximum resistance of about 10.sup.9 ohms, or is rendered so by the phenomenon of electrical breakdown.

REFERENCES:
patent: 3121010 (1964-02-01), Johnson et al.
patent: 3234017 (1966-02-01), Heyl et al.
patent: 3337339 (1967-08-01), Snelling
patent: 3932034 (1976-01-01), Takahashi
patent: 4076857 (1978-02-01), Kasper et al.
patent: 4081571 (1978-03-01), Nishihama et al.

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