Method for the determination and indication of the supply of fil

Details Method for the determination and indication of the supply of fil Method for the determination and indication of the supply of fil

1986-11-06

1988-07-19

Gellner, Michael L.

354 65, 354218, G03B 164, G03B 3904

Patent

active

047588519

ABSTRACT:
A method is provided for determining and indicating a supply of film remaining in an aerial photography camera, which results in greater measuring precision and improved indication options. While film is advanced during a film step from a film feed spool through a film advancing device to a film take-up spool, pulse counts are taken by coded discs connected to each of the film feed spool and film advancing device. These pulse counts and the length of film advanced during the film step are then used to determine the total circumference of the film on the film feed spool. The total circumference and film thickness are then used to determine the number of film windings remaining on the film feed spool. Finally, the number of remaining exposures of film and the remaining length of the film are determined from the number of remaining windings and both are indicated at an indicator unit.

REFERENCES:
patent: 3816842 (1974-06-01), Glaros et al.

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