Photocopying – Including fiber optics
Patent
1975-08-07
1977-05-17
Miller, Jr., George H.
Photocopying
Including fiber optics
355 7, 355 11, G03G 1500
Patent
active
040238962
ABSTRACT:
The camera portion of a photocopy machine employs a vacuum platen type of transport for moving photoconductive sheets into exposure-position.
The sheets are of one standard size, and are normally properly filled when imaged in one-to-one size relationship with the original, but less than the full sheet is imaged whenever a reduction mode is imposed.
The photoconductive sheet is blanket charged over its entire surface before it moves to the image area and therefore, if less than the full frame is exposed, there will be large areas of residual field which will pick up toner and produce toned marginal areas, which is undesirable and wasteful. Whenever the photoconductive sheet is a master, the residual field will print the block in ink on every copy, usually rendering them unfit for use.
Accordingly, this invention is directed to the elimination of the residual field in the reduction mode of exposure by providing an automatic masking device, and a flooding of unused portions of the sheet with light energy to dissipate unwanted charge areas.
REFERENCES:
patent: 3724940 (1973-04-01), Koizumi
patent: 3724942 (1973-04-01), Gibson et al.
patent: 3784301 (1974-01-01), Sato
patent: 3901593 (1975-08-01), Kogiso et al.
patent: 3967896 (1976-07-01), Looney et al.
Addressograph Multigraph Corporation
Miller Jr. George H.
Root Russell L.
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