Film position detection apparatus and method and image film proj

Details Film position detection apparatus and method and image film proj Film position detection apparatus and method and image film proj

1998-03-20

1999-07-13

Blankenship, Howard B.

Optics: motion pictures

Camera and/or projector drive mechanisms

352 92, 396406, 324688, G03B 100

Patent

active

059234016

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.

REFERENCES:
patent: 4713603 (1987-12-01), Thorn
patent: 4743837 (1988-05-01), Herzog
patent: 5710616 (1998-01-01), Saito et al.
patent: 5757196 (1998-05-01), Wetzel
patent: 5767686 (1998-06-01), Kespohl

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