Film cassette with film exposure status indicator

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

1990-05-07

1991-01-22

Hix, L. T.

Winding, tensioning, or guiding

Coil holder or support

Spool or core

354216, 242 711, G03B 1726, G03B 100, G03B 104

Patent

active

049874373

ABSTRACT:
A film cassette comprises a film spool rotatable inside a lightight cassette shell in an unwinding direction to thrust a filmstrip coiled about the spool automatically to the exterior of the shell, and a film exposure status indicator movable from an unexposed position for providing a visible indication that the filmstrip is unexposed to an exposed position for providing a visible indication that the filmstrip is exposed. According to the invention, the spool, the shell, and the status indicator include respective cooperating means for preventing rotation of the spool in the unwinding direction when the status indicator is located in its unexposed position, but which can be rendered ineffective (by a camera device, for example) to allow rotation of the spool in the same direction.

REFERENCES:
patent: 4887110 (1989-12-01), Harvey

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