Lens moving device for opaque reader

Details Lens moving device for opaque reader Lens moving device for opaque reader

1978-02-06

1979-03-27

Stephan, Steven L.

Optics: image projectors

Cabinet encloses projector and one side of screen

Focus or variable magnification

350255, 353101, G03B 2114, G03B 300, G02B 702

Patent

active

041463153

ABSTRACT:
A magnification of the displayed image of an opaque reader can be changed between first and second values by a single manual movement. A diopter lens disposed in front of the projection lens provides a first magnification. The single movement functions to remove the diopter lens and simultaneously shift axially the position of the projection lens thereby providing the desired second magnification, the simultaneous movement of the diopter and projection lens from first to second positions assuring that the magnified images under both magnifications are in focus.

REFERENCES:
patent: 4030821 (1977-06-01), Badalich
patent: 4068935 (1978-01-01), Koester

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