G - Physics – 03 – B
Patent
G - Physics
03
B
271/37
G03B 1/00 (2006.01) G03B 21/00 (2006.01)
Patent
CA 1064979
ABSTRACT OF THE DISCLOSURE A film strip projection arrangement includes a projection optics system adapted to cooperate with a device for guiding and transporting a film strip for projection, the film strip having perforations along at least one of the longitudinal edges thereof. The device consists of two spaced parallel plates having grooves forming a closed orbital track for the film strip, with one or more film strip entry or exit groove portions extending tangentially from the orbital track to an edge of the plate. A driving gear engages the perforations to drive the film strip around the track for endless projection of the film strip by cooperation of the projection optics system with a film gate or window of the device. The film strip length is a little greater than or equal to the length of the orbital track. The device reduces possible damage to film strips, and also eliminates the need for glueing the ends of a film strip to form an endless loop.
245843
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