Variable magnification copying apparatus

Details Variable magnification copying apparatus Variable magnification copying apparatus

1980-12-03

1982-06-22

Prescott, Arthur C.

Photocopying

Projection printing and copying cameras

Combined with or convertible to a contact printer

355 3CH, 355 57, 355 8, G03G 1528, G03G 1500

Patent

active

043359531

ABSTRACT:
The ratio of the length of the light path between an original to be copied and a lens to the length of the light path between the lens and a photosensitive medium is changed by the copying magnification changing operation. That is, for example, the lens is brought nearer to the photosensitive medium. After this magnification changing operation, a reference light is thrown upon the photosensitive medium through the lens. The potential of the area of the photosensitive medium illuminated by the reference light is detected, and the output of photosensitive medium charging means is controlled correspondingly to that potential.

REFERENCES:
patent: 3778147 (1973-12-01), Reehil et al.
patent: 4003650 (1977-01-01), Courtney et al.
patent: 4167325 (1979-09-01), Plumadore
patent: 4192609 (1980-03-01), Tani et al.
patent: 4209248 (1980-06-01), Gibson et al.

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