Patent
1978-01-12
1979-12-04
Gellner, Michael L.
354173, 354289, G03B 1718
Patent
active
041769279
ABSTRACT:
Photographic apparatus for use with cassettes wherein one side of the film is contacted by the carbon layer of a backing strip has two spaced-apart contacts which engage the other side of the film in line with the perforations. The contacts are connected with a signal generating circuit having a diode which emits light or ceases to emit light when both contacts simultaneously engage the carbon layer whose ohmic resistance is high and which then constitutes one resistor of a voltage divider. The contacts also engage the carbon layer behind the trailing end of the film whereby the diode furnishes a signal which indicates that the apparatus has exposed the last film frame. Alternatively, the apparatus has three electric contacts which bear against the other side of the film and two of which serve to effect the generation of a first signal in response to detection of a perforation. The third contact cooperates with one of the two contacts to effect the generation of a different signal (or a signal which is furnished by a different component) in response to engagement with the carbon layer behind the trailing end of the film.
REFERENCES:
patent: 3552841 (1971-01-01), Michelson
patent: 4024557 (1977-05-01), Aoyama et al.
AGFA-Gevaert A.G.
Gellner Michael L.
Kontler Peter K.
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