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US 5,847,754 AGranted
High resolution film scanner/telecine which uses a microlithographic diffuser laminate to aid in the reduction of visibility of surface imperfections in the film
AssigneeRank Cintel Limited
InventorShane Thornton
Life of this patent
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Abstract
A high resolution film scanner or telecine uses a microlithographic diffuser laminate (24) arranged adjacent the film. The diffuser diffuses a collimated light beam produced from a light source and the optics of a film scanner or telecine. This type of diffuser is inexpensive, yet produces a more uniformly distributed light intensity and aids in the reduction in visibility of surface imperfections such as scratches on the scanned film.
Claims61
A film scanner comprising:
- a light source for illuminating film to be scanned;
- a film plane in which film to be scanned is arranged;
- a condenser having at least one collimating lens arranged in a light path between said light source and said film to provide a collimated beam of light;
- a microlithographic diffuser laminate arranged in said light path adjacent said film to diffuse said collimated beam of light prior to said film;
- and at least one photodetector arranged to detect light passed by said film.
2 more elements
A film scanner comprising:
- a light source for illuminating film to be scanned;
- a film plane in which film to be scanned is arranged;
- a condenser having at least one collimating lens and a filter arranged in a light path between said light source and said film to provide a collimated beam of light having a predetermined spectral characteristic;
- a microlithographic diffuser laminate arranged in said light path adjacent the film to diffuse said filtered collimated beam of light prior to said film;
- and
- at least one photodetector arranged to detect light passed by said film.
3 more elements
Dependencies are inferred from the claim text.