Optics: motion pictures – With framing and/or travel ghost elimination
Patent
1998-06-24
2000-04-11
Mathews, Alan A.
Optics: motion pictures
With framing and/or travel ghost elimination
352166, G03B 2146, G03B 100
Patent
active
060480661
ABSTRACT:
A movie film image projecting device wherein a movie film is intermittently stopped in a manner synchronized with rotation of a sprocket by means of travel-synchronizing holes which have been formed longitudinally with respect to the movie film and a light from a light source is projected on a stated region of the movie film at a stopped base position. Detectors for detecting at a plurality of locations the displacement of the film from the base position at the time the movie film has stopped, on the basis of the travel-synchronizing holes, output a different position detection signal corresponding to the deviation of the film from the base position at each of the plurality of locations. An abnormality judging circuit supplied with the position detection signals determines whether or not the position detection signals are abnormal and outputs an abnormality detection signal for each of the position detection signals which is determined to be abnormal. An optical axis correcting unit supplied with the position detection signals and the abnormality detection signals then corrects the optical axis of light transmitted through the movie film on the basis of the position detection signals which are judged by the abnormality judging means to be not abnormal.
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Fuller Rodney
Mathews Alan A.
Shaw Philip M.
Sony Corporation
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