Optical apparatus for electrophotographic copying machine

Details Optical apparatus for electrophotographic copying machine Optical apparatus for electrophotographic copying machine

1979-04-10

1980-08-26

Hix, L. T.

Photocopying

Projection printing and copying cameras

Focus or magnification control

350255, G03B 2770, G02B 711

Patent

active

042192730

ABSTRACT:
A lens positioning device for an electrophotographic copying machine having at least three magnification modes and including a projecting lens unit movable along the optical axis between extreme positions representing the largest and smallest magnifications through an intermediate position representing a magnification substantially intermediately between the largest and smallest magnifications. The lens positioning device comprises a stopper mechanism for trapping the projecting lens unit at the intermediate position accurately and exactly. This stopper mechanism includes at least one blocking element pivotally carried by a movable block and operable to halt the movement of the projecting lens unit when the movable block is moved to a position where the blocking element is ready to engage the projecting lens unit.

REFERENCES:
patent: 3778147 (1973-12-01), Reehil et al.
patent: 3873189 (1975-03-01), Whitaker et al.
patent: 3884574 (1975-05-01), Doi et al.

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