Film cartridge with visual exposure status indicator

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

1997-05-07

1999-04-13

Gray, David M.

Photography

Camera detail

Detachable or removable film holder unit

G03B 1726

Patent

active

058936564

ABSTRACT:
A film cartridge comprises a rotatable film spool, 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. The film exposure status indicator includes a film exposed indication positioned to be seen, and a dry erasable coating that covers the film exposed indication to conceal the film exposed indication from view and that can be erased to reveal the film exposed indication. A wiper device for erasing the erasable coating is positioned in contact with the erasable coating. Either one of the film exposed status indicator and the wiper device is connected to the film spool for rotation with the film spool relative to whichever one of the film exposed status indicator and the wiper device is not connected to the film spool, whereby the relative movement between the film exposed status indicator and the wiper device will cause the wiper device to erase the erasable coating.

REFERENCES:
patent: 5629749 (1997-05-01), Tsukahara et al.
patent: 5708879 (1998-01-01), Manico et al.
patent: 5715494 (1998-02-01), Harris et al.

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