Photoreceptor charging scorotron

Details Photoreceptor charging scorotron Photoreceptor charging scorotron

1984-10-22

1986-08-05

Grimley, Arthur T.

Photocopying

Projection printing and copying cameras

Combined with or convertible to a contact printer

355 3CH, 361235, 250325, G03G 1502

Patent

active

046039643

ABSTRACT:
A charge scorotron having a U-shaped shield positionable opposite a photoreceptor, a corona discharge wire in the shield, a grid between the wire and the photoreceptor for controlling the emission of ions to the photoreceptor, the grid being electrically subdivided into a first grid segment with a length substantially equal to the dimension of the smallest size copy sheet with subsequent grid segments having lengths chosen when combined with the first grid segment and each other to substantially equal various larger size copy sheets, switches responsive to the position of an adjustable sheet guide in the copy sheet supply tray connecting each of the other grid segments with the grid bias selectively, the switches when not actuated coupling the grid segment associated therewith to ground whereby the area of the photoreceptor charged is determined by the number of grid segments coupled to the grid bias in response to the size copy sheet being processed.

REFERENCES:
patent: 3527941 (1970-09-01), Culhane et al.
patent: 3578970 (1971-05-01), Michaud et al.
patent: 3944356 (1976-03-01), Hayne
patent: 4123156 (1978-10-01), Inowa et al.
patent: 4233511 (1980-11-01), Harada et al.
patent: 4550253 (1985-10-01), Hashimoto
Xerography and Related Processes, edited by Dessauer, John H., et al., Focal Press, London, 1965, p. 202.

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