Automatic film transport monitoring system
First Claim
1. Automatic film transport monitoring system for still and motion picture cameras, comprisingfilm movement sensing means (2, 43;
- 62) coupled to the film (54,
67) and generating at least one film movement pulse as the film advances in the camera, said film movement sensing means providing a predetermined number of output pulses corresponding to and representative of a predetermined length of film being advanced in the camera;
and a pulse count number evaluation circuit (3, 4,
6) connected to and controlled by said film movement sensing and pulse generating means (2, 43;
62) and providing an alarm output signal if said predetermined number of output pulses has not been attained.
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Accused Products
Abstract
To check movement of film in still, or motion picture cameras, a movement sensing means is coupled to the film, for example a cam-operated switch coupled to the film payout spindle, an opto-electrical sensor sensing perforations in the film or the like, and generating film motion pulses. The pulses are counted in an evaluation circuit enabled when film movement is commanded, the evaluation circuit providing an alarm output if a predetermined number of output pulses has not been attained. When related to a motion picture camera, a timing circuit is included to check the generation of the number of pulses within a predetermined timing interval.
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Citations
12 Claims
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1. Automatic film transport monitoring system for still and motion picture cameras, comprising
film movement sensing means (2, 43; - 62) coupled to the film (54,
67) and generating at least one film movement pulse as the film advances in the camera, said film movement sensing means providing a predetermined number of output pulses corresponding to and representative of a predetermined length of film being advanced in the camera;and a pulse count number evaluation circuit (3, 4,
6) connected to and controlled by said film movement sensing and pulse generating means (2, 43;
62) and providing an alarm output signal if said predetermined number of output pulses has not been attained. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
- 62) coupled to the film (54,
Specification