Photography – With film drive – Double exposure prevention
Patent
1996-10-08
1998-01-13
Metjahic, Safet
Photography
With film drive
Double exposure prevention
396397, 396406, 396319, G03B 118, G03B 1724
Patent
active
057088870
ABSTRACT:
A camera has a feeding motor by use of which photo film is fed. 24 groups of perforations are arranged along one edge of the photo film, and regularly at a distance L2 one group from another. Each of the perforation groups is associated with one frame, and includes two perforations arranged at a distance L1 therebetween. To control the photo film feeding, pulses are generated in synchronism with the photo film feeding. The perforations are detected through a sensor. The pulses are counted while the photo film is fed by the distance L1 or L2, and during a period started upon movement of a first one of the perforations past the sensor and finished upon detection of a second one of the perforations at the sensor. A counted number of the pulses is compared with a reference value upon finish of counting the pulses. If the counted number is equal to or more than the reference value, the feeding motor is decelerated. Afterwards, the feeding motor is stopped upon detection of a third one of the perforations at the sensor. If the counted number is less than the reference value, the feeding motor is still driven.
REFERENCES:
patent: 5345286 (1994-09-01), Stiehler
patent: 5576785 (1996-11-01), Kazami et al.
Funaki Akihiko
Nishinou Naoyuki
Fuji Photo Optical Co., Ltd.
Fuji Photo Film Co. , Ltd.
Han J. K.
Metjahic Safet
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