Film cartridge with film movement indicator, and associated indi

Details Film cartridge with film movement indicator, and associated indi Film cartridge with film movement indicator, and associated indi

1995-01-04

1996-08-27

Gray, David M.

354 21, G03B 1726, G03B 700

Patent

active

055506097

ABSTRACT:
A film cartridge has a folded-over tab protruding from a film egress slot in the form of a loop to be unfolded by a film leader moving outwardly through the slot and an electrically conductive patch located on the loop to be accessible for sensing only when the loop is unfolded. A sensor in a photographic camera or other film handling apparatus is positioned to detect the patch only when the loop is unfolded.

REFERENCES:
patent: 3364832 (1968-01-01), Engelsmann et al.
patent: 3670638 (1972-06-01), Lindsay
patent: 4887110 (1989-12-01), Harvey
patent: 5264886 (1993-11-01), Byrd

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