Perforation detector of a camera

Details Perforation detector of a camera Perforation detector of a camera

1995-06-07

1996-05-28

Gray, David M.

354217, G03B 118

Patent

active

055216668

ABSTRACT:
A perforation detector of a camera comprises a light emitting unit for emitting light to a film, a photo-sensor for sensing reflected light from the film to produce a signal representing a sensed light intensity, the light intensity of the reflected light varying with presence or absence of a perforation at a reflection area of the film, a detection unit for comparing the signal from the photo-sensor with a predetermined value to detect a perforation of the film, and a control unit for controlling the light intensity of the light emitting unit in accordance with the signal from the photo-sensor.

REFERENCES:
patent: 4131350 (1978-12-01), Uchiyama et al.
patent: 4431292 (1984-02-01), Takahashi
patent: 4540261 (1985-09-01), Matsumoto et al.
patent: 4685786 (1987-08-01), Iida et al.
patent: 4954859 (1990-09-01), Kitazawa
patent: 4972214 (1990-11-01), Shibayama et al.
patent: 4996549 (1991-02-01), Yamaguchi
patent: 5184174 (1993-02-01), Bell

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