Gas separation: apparatus – Magnetic separating means
Patent
1978-01-03
1979-06-19
Welsh, John D.
Gas separation: apparatus
Magnetic separating means
355 3SC, G03G 13048
Patent
active
041585640
ABSTRACT:
An electrostatic latent image is impressed on a multilayer apertured screen to establish within the apertures electric fields that modulate the passage of charged particles through the screens so that the charged particles are distributed in correspondence with the image. After imaging the screen is operated to control the gray scale response thereof in order to optimize copy quality. The gray scale screen response is expanded by applying a bias voltage of at least two different values to the screen during the duplication interval. The response is limited by altering the latent image charge to provide a high density cutoff and by applying a bias voltage to establish a low density cutoff during the duplication interval. Copy quality is further improved by adjusting the integrated charged particle current to establish the desired degree of density in regions of the copy image corresponding to high density regions of the original image.
REFERENCES:
patent: 3582206 (1971-06-01), Burdige
patent: 3647291 (1972-03-01), Pressman
patent: 3680954 (1972-08-01), Frank
patent: 3713734 (1973-01-01), Crane et al.
patent: 3737222 (1973-06-01), Briggs et al.
patent: 3797926 (1974-03-01), Fotland et al.
patent: 3942980 (1976-03-01), Hou
Gardiner Kenneth W.
Pressman Gerald L.
Electroprint, Inc.
Welsh John D.
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