Film end detector for use in cameras

Details Film end detector for use in cameras Film end detector for use in cameras

1984-01-09

1986-02-25

Hix, L. T.

354214, G03B 124, G03B 1742

Patent

active

045726370

ABSTRACT:
A film end detector produces a film end signal as being a film end when a timer which initiates a timing operation in synchronism with initiation of a power supply to a film winding motor is not reset within a given detection period and is capable of changing the detection period in accordance with a camera condition. The detection period can be changed in accordance with a power voltage, a temperature, a simultaneous charging to an electronic flash unit or the like. This makes it possible to properly detect the film end in accordance with a camera condition and to effectively prevent an error in the detection of the film end.

REFERENCES:
patent: 3846812 (1974-11-01), Biber
patent: 4400074 (1983-08-01), Akiyama et al.

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