Slide projector with automatic focusing system

Details Slide projector with automatic focusing system Slide projector with automatic focusing system

1978-03-08

1980-03-11

Stephan, Steven L.

Optics: image projectors

Lens support

Lens position adjustable

350255, 352140, G03B 310

Patent

active

041925858

ABSTRACT:
Slide projectors with automatic focusing systems consisting of a scanning auxiliary projecting system and a position control focusing the slide and comprising a light sensor detecting the reflections from the slide are improved by mounting the light sensor outside the scattered light zone generated when the main projection beam passes through the slide. The light source of the auxiliary projecting system is operated at less than rated voltage and silicon cells are used as light detectors. The light course comprises a lens which is mounted in the same manner as the light sensor on holders and the holders are pivotably supported for the purpose of adjustments.

REFERENCES:
patent: 3249006 (1966-05-01), Stauffer
patent: 3628863 (1971-12-01), Kottler
patent: 3976877 (1976-08-01), Thillays

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