G - Physics – 03 – G
Patent
G - Physics
03
G
314/7
G03G 15/00 (2006.01) G03G 15/047 (2006.01)
Patent
CA 1213315
ABSTRACT A xerographic type reproduction machine having a photoreceptor, a platen for supporting a document to be copied, an exposure lamp, and optical means for transmitting image rays from the platen and the document thereon to the photoreceptor to create a latent electrostatic image of the document on the photoreceptor; an edge erase lamp, means forming a fiber optic type conduit for transmitting a band of light from the erase lamp onto the photoreceptor to erase any non-image areas adjoining the edge of the latent image, a movable shutter when disposed in a home position closes the fiber optic conduit and prevent exposure of the photoreceptor to the erase lamp whereby to obviate possible deterioration of the photoreceptor from excessive exposure by the erase lamp; a cover for the platen having a highly reflective interior; and control means responsive to the closure of the cover to retain theshutter in park position and rely on light reflected from the cover interior during exposure to erase the non-image areas without exposing the photo- receptor to the erase lamp, the control means responding to a reduction in image size to move the shutter in accordance with either the size of the copy sheets in process or the reduced image size so that light from the erase lamp is used to discharge the photoreceptor non-image area resulting from the reduction in image size, the control means further responding to disposition of the cover in an inoperative position to move the shutter in accordance with the size of the copy sheets in process to erase any photoreceptor non-image area with light from the erase lamp.
456390
Sim & Mcburney
Xerox Corporation
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