Image projection apparatus and the method of driving the zoom le

Details Image projection apparatus and the method of driving the zoom le Image projection apparatus and the method of driving the zoom le

1990-12-18

1992-10-06

Moses, Richard L.

Photocopying

Projection printing and copying cameras

Focus or magnification control

355 45, 355243, 355271, G02B 700

Patent

active

051536382

ABSTRACT:
An image projection apparatus which projects an image of a microfilm onto a screen and copies the image. Among a plurality of projection lenses, which are zoom lenses having set-ups of magnifications in correspondence to the sizes of text images and copy paper, a lens with a set-up of the intended magnification is mounted selectively on the apparatus for the operation. When the lens is mounted, it is initialized to a reference magnification regardless of the magnification which has been set, and in this operation the zoom value is memorized. Subsequently, the lens is zoomed by the memorized zoom value in the opposite direction so that the magnification which has been set previously is restored.

REFERENCES:
patent: 4412737 (1983-11-01), Iwanade et al.
patent: 4521100 (1985-06-01), Yonemori et al.
patent: 4806988 (1989-02-01), Verner
patent: 4942425 (1990-07-01), Kamimura et al.
patent: 5036352 (1991-07-01), Kamimura et al.

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