Film cassette spool with exposure indicator

Details Film cassette spool with exposure indicator Film cassette spool with exposure indicator

G - Physics

03

B

G03B 17/26 (2006.01)

Patent

CA 2135324

A film spool of the type which is rotatable inside a light- tight cassette shell as a film strip coiled about the spool is pulled out of the shell, has a film exposure status indicator movable from a first position to a second position where it provides a visible indication that the film is completely exposed. The status indicator includes an element movable within the hollow interior of the spool core between the first and second positions, a spring urging the element towards the second position, and a retaining device cooperating with an end portion of the film strip to prevent movement of the element until the film strip has been fully unwound.

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