Optics: image projectors – Lens support – Lens position adjustable
Patent
1975-04-15
1977-04-19
Stephan, Steven L.
Optics: image projectors
Lens support
Lens position adjustable
350255, 352140, 355 55, G03B 300, G03B 2114, G02B 702
Patent
active
040185206
ABSTRACT:
The present invention is directed to a transparency projector, such as a slide or motion picture projector including a compact focusing mechanism having an objective lens carried within a lens barrel supported within a sleeve which is carried within the projector housing for axial reciprocal displacement along the optical axis. The sleeve is provided with means for engaging a guide rod supported within the projector housing for limiting movement of the sleeve to axial movement. A reversible electric motor is supported on the sleeve for movement therewith and is energized in response to slide position error signals received from an automatic focusing system of the type well known in the art. The electric motor operates to drive a disc rotatably carried on the sleeve. The disc is provided with a spiral groove on one face. A pin fixedly supported on the projector housing is arranged for engagement with the spiral groove so that upon rotation of the disc, engagement of the pin within the spiral will produce axial movement of the lens barrel supporting sleeve along the guide rod.
REFERENCES:
patent: 3071041 (1963-01-01), Walter
patent: 3349667 (1967-10-01), Levin et al.
patent: 3496851 (1970-02-01), Himmelsbach
patent: 3712725 (1973-01-01), Eckerdt
patent: 3861794 (1975-01-01), Sobotta
Dresner Arthur
GAF Corporation
Kehm Walter C.
Stephan Steven L.
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