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 Title: |
US5257051:
Method and apparatus for adjusting the optical alignment of a film projection system
[ Derwent Title ]
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| Country: |
US United States of America
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| Inventor: |
Bushroe, Frederick N.; Redondo Beach, CA
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| Assignee: |
The Walt Disney Company, Burbank, CA
other patents from WALT DISNEY COMPANY (617665) (approx. 101)
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| Published / Filed: |
1993-10-26
/ 1992-12-24
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| Application Number: |
US1992000996670
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| IPC Code: |
Advanced:
G01B 11/27;
G03B 21/20;
G03B 21/28;
Core:
more...
IPC-7:
G02B 11/26;
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| U.S. Class: |
Current:
353/122;
356/123;
356/153;
Original:
353/122;
356/153;
356/123;
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| Field of Search: |
356/153,154,152,123,253,254,255
353/095,96,28,122,120,87
033/286,288
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| Priority Number: |
| 1992-12-24 |
US1992000996670 |
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| 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.
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| Attorney, Agent or Firm: |
Pretty, Schroeder, Brueggemann & Clark ;
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| Primary / Asst. Examiners: |
Cuchlinski, Jr., William A.; Dowling, William C.
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| INPADOC Legal Status: |
Show legal status actions
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| Family: |
None
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First Claim:
Show all 12 claims |
I claim:
1. A method for adjusting the optical alignment of a film projection system 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, a generally ellipsoid collector for reflecting light from the light source along an optical axis of the collector and a folding mirror for reflecting light from the light source and the collector to the gate, the system when correctly adjusted having a system optical axis formed by the optical axes of the collector, the gate and the lens mount in which the film gate opening is centered with respect to the optical axis of the lens mount and the illumination from the light source and collector reflected by the folding mirror is centered on the film gate opening distributed evenly across it, the method comprising the steps of,
- removing the light source from the collector;
- mounting a target adjacent the base of the collector with a center marking on the target centered coincident with the optical axis of the collector;
- projecting a laser beam in alignment with the optical axis of the lens mount;
- splitting the laser beam into a center beam aligned with the optical axis of the lens mount and at least two side beams equally inclined divergently from the center beam on opposite sides thereof, said center beam being reflected by the folding mirror, the side beams reflecting successively from the folding mirror and from interior reflecting surfaces of the collector;
- adjusting the position of the collector in a plane perpendicular to the center beam path to move the center marking of the target into coincidence with a spot of light produced thereon by the center beam reflected from the folding mirror, thereby centering the collector relative to the optical axis of the lens mount;
- placing an intercept sheet temporarily in the reflected paths of the side beams from the collector and of the center beam from the folding mirror to create visible side beam light spots and a center beam light spot on the intercept sheet;
- adjusting the tilt between the collector and the folding mirror to move the side beam light spots into coincidence with the center beam light spot on the intercept sheet, thereby bringing the optical axis of the collector and the optical axis of the lens mount into coincidence with the system optical path.
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| Background / Summary: |
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| Drawing Descriptions: |
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| Description: |
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| Forward References: |
Show 7 U.S. patent(s) that reference this one
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