Film winding apparatus

Details Film winding apparatus Film winding apparatus

1992-10-19

1994-06-21

Adams, Russell E.

G03B 118

Patent

active

053231988

ABSTRACT:
A film winding apparatus of a camera for winding and/or rewinding a perforated film. The film winding apparatus includes a photoelectric member that is opposed to perforations of the film to detect presence or absence of the perforations in the film. A predetermined reference value, along with an upper threshold value and a lower threshold value, is set in accordance with an initial signal output by the photoelectric member. A second mechanism detects a feed position of the film by comparing a rising output curve and a descending output curve produced by the photoelectric member with the upper and lower threshold values of the predetermined reference value.

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patent: 4996549 (1991-02-01), Yamaguchi
patent: 5091740 (1992-02-01), Hori
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patent: 5136314 (1992-08-01), Kazami et al.
Patent Abstracts of Japan, vol. 15, No. 11 (P-1150), Jan. 10, 1991.
Patent Abstracts of Japan, vol. 13, No. 219 (P-875), May 23, 1989.
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French Search Report and Annex.

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