Capacitive film position sensing system for a film processor

Details Capacitive film position sensing system for a film processor Capacitive film position sensing system for a film processor

1991-04-18

1992-09-15

Hix, L. T.

G03D 308

Patent

active

051482070

ABSTRACT:
A photographic media position sensing system for use in conjunction with a media processor of the type including a plurality of processing tanks for holding baths of conductive liquid media developing chemicals and a transport mechanism for driving the media through and between the processing tanks. The system includes a plurality of sensing electrodes, each of which is positioned adjacent to one of the processing tanks. One or more ground electrodes are positioned within the processing tanks for making electrical contact with the baths of developing chemicals. Media sensor circuits are connected between the ground electrodes and sensing electrodes. The media sensor circuits provide sensed media signals representative of the presence of media between the sensing electrode and adjacent processing chemical bath as a function of the capacitance between the sensing and ground electrodes. Location identifying circuitry is coupled to the media sensor circuits and provides media location signals as a function of the sensed media signals. A visual display of the positions of the media within the processing tanks is provided by a display interfaced to the location identifying circuitry.

REFERENCES:
patent: 3600676 (1971-08-01), Lugwig et al.
patent: 3841610 (1974-10-01), Hanzawa et al.
patent: 4837499 (1989-06-01), Scherer, III
patent: 5035415 (1991-07-01), Lee

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