Radiant energy – Ionic separation or analysis – Static field-type ion path-bending selecting means
Patent
1989-09-12
1991-02-26
Hix, L. T.
Radiant energy
Ionic separation or analysis
Static field-type ion path-bending selecting means
354217, 250561, G03B 118, G03B 1736
Patent
active
049965492
ABSTRACT:
A film feeding control device for a camera in which film perforations are arranged so as to pass through a detecting section of a photointerrupter during film feeding, which detects the presence of perforations by comparing an output signal from the photointerrupter when the perforations pass through the detecting section with a predetermined threshold limit value and which detects film feeding conditions according to the variation of the output signal, characterized in that the device includes: (i) calculating means for calculating an average value from maximum and minimum values of the output signal from the photointerrupter; (ii) judging means for establishing the average value as the threshold limit value and for discriminating the film feeding condition by comparing the output signal from the photointerrupter with the threshold limit value; and (iii) controlling means for controlling the feed of film according to the judged result by the judging means.
REFERENCES:
patent: 4431292 (1984-02-01), Takahashi
patent: 4482227 (1984-11-01), Shiozawa et al.
patent: 4772800 (1988-09-01), Kanai et al.
Hix L. T,.
Konica Corporation
Spyrou Cassandra C.
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