Microfilm projection apparatus having zoom lenses

Details Microfilm projection apparatus having zoom lenses Microfilm projection apparatus having zoom lenses

1990-10-26

1991-07-30

Brown, Brian W.

Photocopying

Projection printing and copying cameras

With focusing or projection screen

355 55, G03B 1328

Patent

active

050363522

ABSTRACT:
A microfilm projection apparatus is disclosed which is usable for a plurality of zoom lenses having different magnification ranges from each other. In the zoom lenses attached, the zoom lens selected from the plurality of zoom lenses to be used is identified. A plurality of specific magnifications corresponding to each zoom lens are memorized. When the zoom lens is set in place, the specific memorized magnifications corresponding to the selected zoom lens are indicated. The magnification of the zoom lens is set to the desired magnification designated from the specific magnifications.

REFERENCES:
patent: 4172657 (1979-10-01), Watanabe et al.

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