Method and apparatus for creating contrasting images at substant

Details Method and apparatus for creating contrasting images at substant Method and apparatus for creating contrasting images at substant

1988-12-22

1990-04-03

Goodrow, John L.

Radiation imagery chemistry: process, composition, or product th

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

To produce color reproduction

355246, G03G 1508

Patent

active

049133489

ABSTRACT:
An electrostatic charge pattern is formed on a charge retentive surface. The charge pattern comprises charged image areas and discharged background areas. The fully charged image areas are at a voltage level of approximately -500 volts and the background is at a voltage level of approximately -100 volts. A spatial portion of the image area is used to form a first image with a narrow development zone while other spatial portions are used to form other images which are distinct from the first image in some physical property such as color or magnetic state. The development is rapidly turned on and off by a combination of AC and DC electrical switching. Thus, high spatial resolution multi-color development in the process direction can be obtained in a single pass of the charge retentive surface through the processing stations of a copying or printing apparatus. Also, since the voltages representing all images are at the same voltage polarity unipolar toner can be employed.
In order to effect development of all images with a unipolar toner, each of the development system structures is capable of selective actuation without physical movement.

REFERENCES:
patent: 4459009 (1984-07-01), Hays et al.
patent: 4710016 (1987-12-01), Watanabe
patent: 4731634 (1988-03-01), Stark
patent: 4742373 (1988-05-01), Nakatani
patent: 4752802 (1988-06-01), Ito et al.
patent: 4754301 (1988-06-01), Kasamura et al.
patent: 4811046 (1989-03-01), May

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