Camera with automatic film initialization responsive to cartridg

Photography – With film drive – Having significant electronic circuit detail

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G03B 100

Patent

active

059602210

ABSTRACT:
In a low cost camera, film initialization to a first exposure frame by a time constant controlled drive circuit in which the time constant circuit is reset by a "cartridge present" sensor switch as a consequence of removing a film cartridge from the camera. This ensures that newly loaded film will be automatically initialized to the first exposure position without requiring the camera user to remember to actuate a shutter release button multiple times to achieve proper initialization. A flash charger circuit in the camera is automatically started at the end of frame advance or at the end of film initialization by opening of a film metering sensor switch that allows discharge of a capacitor into the time constant circuit, capacitor discharge generating a starting pulse sent to the charger circuit.

REFERENCES:
patent: 4340291 (1982-07-01), Berg
patent: 4653886 (1987-03-01), Malloy-Desormeaux
patent: 4716428 (1987-12-01), Kawamura et al.
patent: 4752795 (1988-06-01), Malloy-Desormeaux
patent: 4896180 (1990-01-01), Lawther
patent: 5255034 (1993-10-01), Shimada et al.
patent: 5689733 (1997-11-01), Zawodny et al.

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