Backlash free lens focusing apparatus

Details Backlash free lens focusing apparatus Backlash free lens focusing apparatus

1976-09-20

1978-01-17

Stephan, Steven L.

Optics: image projectors

Selective projection on distant or cabinet screen

350254, 350255, 353101, G02B 702, G03B 2122, G03B 300

Patent

active

040689352

ABSTRACT:
Apparatus for focusing a lens or lenses in which the focus adjustment is stable and in which backlash is reduced to an imperceptible level without the use of precision components. A unitary lens carrier is mounted on a shaft for axial displacement thereon and includes a first section spaced from a second section. A rotatable cam is mounted between the two sections and a spring is disposed between the cam and the second section to urge the cam against a surface portion of the first section. Rotation of the cam causes axial displacement of the lens carrier.

REFERENCES:
patent: 1822551 (1931-09-01), Tondreau
patent: 3344706 (1967-10-01), Dian
patent: 3349667 (1967-10-01), Levin et al.
patent: 3391979 (1968-07-01), Lessler
patent: 3496851 (1970-02-01), Himmelsbach

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