Position detecting device for a zoom lens of a copying machine

Details Position detecting device for a zoom lens of a copying machine Position detecting device for a zoom lens of a copying machine

1982-03-17

1983-11-01

Gellner, Michael L.

Photocopying

Projection printing and copying cameras

Focus or magnification control

G03B 2752

Patent

active

044127375

ABSTRACT:
A copying machine including a zoom lens is provided with a device for detecting the position of the zoom lens, so that the lens may be correctly positioned at a location corresponding to life or actual size copying. The detector includes a photo-interrupter or the like and a small computer which operates to return the lens to the correct position from any position, but such that the final approach to the correct position is always made from the same direction.

REFERENCES:
patent: 3779642 (1973-12-01), Ogawa et al.

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