Film cartridge with visual exposure status indicator

Details Film cartridge with visual exposure status indicator Film cartridge with visual exposure status indicator

1997-01-10

1998-01-13

Metjahic, Safet

Photography

Exposure data from film container

396515, G03B 1726

Patent

active

057088799

ABSTRACT:
A film cartridge comprising a cartridge housing, a film spool rotatable inside the cartridge housing, and a film exposure status indicator capable of changing state to provide a visual indication of the exposure status of a filmstrip for the film cartridge, is characterized in that a ring having a radial slit coaxially engages the film spool to be rotated concurrently with the film spool, and the indicator is a flexible helix coiled around the film spool and extending through the slit, with one end portion of the helix fixed in place beneath the ring to be concealed from view and to prevent rotation of the helix when the ring is rotated with the film spool, and a further portion of the helix initially located above the ring to be visible but which is adapted to be compressed beneath the ring to disappear from view responsive to movement of the slit along the further portion when the ring is rotated with the film spool, to provide a change of state of the helix from being visible above the ring to being concealed beneath the ring.

REFERENCES:
patent: 5153627 (1992-10-01), Dwyer

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