Method and apparatus for adjusting the optical alignment of a fi

Details Method and apparatus for adjusting the optical alignment of a fi Method and apparatus for adjusting the optical alignment of a fi

1992-12-24

1993-10-26

Cuchlinski, Jr., William A.

Optics: image projectors

Miscellaneous

356153, 356123, G02B 1126

Patent

active

052570517

ABSTRACT:
A method and apparatus for adjusting the optical alignment of a film projection system of the type having a film gate with a central opening, a lens mount having lenses optically aligned along an optical axis of the lens mount, a light source and a generally ellipsoidal collector for reflecting light from the light source along an optical axis of the collector. The method and apparatus utilize a laser light source which is inserted in the position normally occupied by the lenses and a beam splitter which splits the beam of laser light into a center beam and two inclined side beams. An intercept sheet is temporarily placed in the path of the center beam and reflections of the side beams from the interior surface of the collector to create images of the center beam and the reflected side beams on the intercept sheet. By adjustment of the position and tilt of the collector, the images of the center beam and the reflected side beams on the intercept sheet can be brought into coincidence, thereby bringing the optical axes of the collector, the film gate and the lens mount into coincidence with a system optical axis in which the illumination is centered upon the opening through the film gate and distributed evenly over it, with the film gate centered with the optical axis of the projection lens assembly.

REFERENCES:
patent: 3043184 (1962-07-01), Fitzgerald et al.
patent: 3389632 (1968-06-01), Plummer
patent: 3718398 (1973-02-01), Becraft et al.
patent: 3915575 (1975-10-01), Sick
patent: 4145141 (1979-03-01), Noble
patent: 4452532 (1984-06-01), Grollimund et al.

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