Optics: motion pictures – Camera and/or projector drive mechanisms
Patent
1998-03-20
2000-11-07
Blankenship, Howard B.
Optics: motion pictures
Camera and/or projector drive mechanisms
352 92, 396406, 324688, G03B 100
Patent
active
061426326
ABSTRACT:
A film position detection apparatus and a method for precisely detecting a film position are provided. An image film projection apparatus is also provided for correcting deflections of images through precisely detecting a film position and thereby projecting images recorded on the film in a good condition. A film position detection means has a ground electrode attached to a movable picture gate; detection electrodes placed in a fixed picture gate; and auxiliary electrodes placed around the detection electrodes. The auxiliary electrodes suppress erroneous variations in electrostatic capacitance generated between the ground electrode and the detection electrodes. As a result, accuracy in film position detection by the detection electrodes is improved for achieving precise detection.
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Blankenship Howard B.
Frommer William S.
Sony Corporation
Thompson Timothy J
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