Projection apparatus

Details Projection apparatus Projection apparatus

1994-08-22

1997-02-18

Dowling, William C.

Optics: image projectors

Lens support

Lens position adjustable

353120, 40365, G03B 2114

Patent

active

056035608

ABSTRACT:
A projection apparatus comprises an illumination device for emitting onto a film an illumination light for projecting the film, an index member for focus adjustment, a moving mechanism for moving the index member to a focus adjusting position where the index member is in contact with a surface of the film within an optical path of the projection light, and a member to be operated for focus adjustment.

REFERENCES:
patent: 2251184 (1941-07-01), Bohannon
patent: 2865248 (1958-12-01), Goldberg
patent: 3414352 (1968-04-01), Johannsen et al.
patent: 3785733 (1974-01-01), Bender
patent: 4477991 (1984-10-01), Dreritch et al.
patent: 4858003 (1989-08-01), Wirt et al.

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