Variable magnification device

Details Variable magnification device Variable magnification device

1977-12-22

1979-10-30

Griffin, Donald A.

Photocopying

Projection printing and copying cameras

Focus or magnification control

353 27R, 355 45, G03B 2308, G03B 1328, G03B 2752

Patent

active

041726570

ABSTRACT:
A variable magnification device capable of varying magnification of projected images of information bearing media which includes a plurality of interchangeable projection lenses having different focal lengths, a change-over plate for selectively bringing the projection lenses into a predetermined projecting position, and a focusing adjusting ring normally kept out of contact with said projection lenses and capable of engaging for focusing adjustment only the selected one of the projection lenses which has been brought to the predetermined projecting position, and thus once adjusted for focusing, the selected one of the projection lenses is not required to be re-adjusted for focusing even when returned to the predetermined projecting position after having been moved through other positions for further changing over.

REFERENCES:
patent: 1906059 (1933-04-01), Hadaway
patent: 2741170 (1956-04-01), Wenke
patent: 2905069 (1959-09-01), Ayres et al.
patent: 3556655 (1971-01-01), Lux et al.
patent: 3653757 (1972-04-01), Newcomb
patent: 3713737 (1973-01-01), Suzuki et al.
patent: 3999847 (1976-12-01), Maeda et al.

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