Method for the formation of outline images corresponding to the

Details Method for the formation of outline images corresponding to the Method for the formation of outline images corresponding to the

1987-02-19

1988-12-20

Prescott, A. C.

Photocopying

Projection printing and copying cameras

Methods

355 3CH, 355 14CH, 430 35, G03G 1500

Patent

active

047927755

ABSTRACT:
A method for forming an outline of an image. By this method, at first, an electrostatic latent image bearing member is charged and then irradiated to form an electrostatic latent image. Thereafter, the irradiated member is re-charged with a scorotron charger while applying a voltage to the scorotron grid, the voltage being slightly lower than the surface potential of the image portion of the latent image, and being substantially higher than the background potential of the latent image and being of the same polarity as that of the charging. By this re-charging, the outline portion of the image is given lower potential than the other portion. Then, the outline portion of the image with the lower potential is developed by a reversal development by using a toner charged to a polarity the same as the polarity of charging of the latent image bearing member.

REFERENCES:
patent: 3967891 (1976-07-01), Rippstein
patent: 4286036 (1981-08-01), Hendriksma

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