Photographic camera and film cartridge with double exposure prev

Details Photographic camera and film cartridge with double exposure prev Photographic camera and film cartridge with double exposure prev

1993-08-31

1994-09-27

Blankenship, Howard B.

354207, 354275, G03B 700

Patent

active

053511018

ABSTRACT:
A photographic film cartridge has one or more resistive elements formed on the exterior surface of the cartridge with associated visual indicator elements to indicate exposure status of film in the cartridge. The camera is provided with a drive circuit to change the resistance values of the resistive elements to provide an electrically sensed indication of the film exposure status when next the cartridge is placed in the camera. Provision can be made for both full exposure and mid-roll interrupt indications. At the same time, the heat generated by the resistive element during its change in resistance value is useful to change a characteristic of the associated visual indicator to provide a visual indication of the exposure status of the film in the cartridge.

REFERENCES:
patent: 5030978 (1991-07-01), Stoneham et al.
patent: 5032854 (1991-07-01), Stoneham et al.
patent: 5047794 (1991-09-01), Pagano et al.
patent: 5115268 (1992-05-01), Kitagawa et al.

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