Film cassette with exposure status indicator

Details Film cassette with exposure status indicator Film cassette with exposure status indicator

1989-11-14

1991-03-05

Hix, L. T.

3542891, G03B 1700

Patent

active

049981234

ABSTRACT:
A film cassette capable of advancing a filmstrip automatically from a light-tight cassette shell whether the filmstrip is generally unexposed, partly exposed or substantially completely exposed, is characterized in that a film-exposure status indicator can be disposed in any one of three corresponding positions comprising unexposed, partly exposed and exposed positions. The status indicator includes a physical discontinuity which occupies first and second partly in-common areas when the status indicator is in its unexposed and partly exposed positions, respectively, to allow the discontinuity to be identically sensed at the same location within an in-common portion of the first and second areas regardless of whether the status indicator is in the unexposed or partly exposed position and, alternately, to allow the discontinuity to be sensed at another location within a particular portion of the first area not in-common with the second area only when the status indicator is in the unexposed position, and which occupies a third area when the status indicator is in its exposed position that does not extend to either one of the two locations to prevent the discontinuity from being sensed at each one of those locations when the status indicator is in the unexposed position.

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patent: 4768894 (1973-10-01), Cook
patent: 4887110 (1989-12-01), Harvey
patent: 4894673 (1990-01-01), Beach

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