Film-on-spool sensor for controlling frame counter

Details Film-on-spool sensor for controlling frame counter Film-on-spool sensor for controlling frame counter

1986-05-09

1987-08-18

Gellner, Michael L.

G03B 1736

Patent

active

046873112

ABSTRACT:
In a photographic camera, a film-on-spool sensor enables a frame counter in response to sensing the presence of film on a take-up spool and disables the counter in response to sensing the absence of film on the spool. An initializing device resets the frame counter to an original empty setting whenever the counter is disabled. If a rear door of the camera is accidentally or inadvertently opened with the film in midroll, the film-on-spool sensor sensing the presence of film on the take-up spool prevents the frame counter from being disabled and, therefore, prevents the counter from being reset by the initializing device. This allows the frame counter to continue its frame count after the door is re-closed should the photographer wish to use any unexposed frames remaining on the film.

REFERENCES:
patent: 3380364 (1968-04-01), Bethmann
patent: 3947861 (1976-03-01), Kimura et al.
patent: 4021828 (1977-05-01), Iura et al.
patent: 4494842 (1985-01-01), Kimura et al.

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