Film-on-spool sensor for preventing initialization of frame coun

Details Film-on-spool sensor for preventing initialization of frame coun Film-on-spool sensor for preventing initialization of frame coun

Filed on

1986-02-18

Date issued

1987-03-31

Examiner

Mathews, A. A.

Other Related Categories

354217, G03B 1736

Type

Patent

Status

active

Patent number

046538860

Description

ABSTRACT:
In a photographic camera, a frame counter operates during movement of a filmstrip from a film cartridge onto a take-up spool or back into the cartridge to count exposed or unexposed frames on the filmstrip. An initializing mechanism responsive to the opening of a rear door to remove the cartridge from the camera initializes the counter to an empty setting. If however the door is accidentally or inadvertently opened with the filmstrip in midroll, a film-on-spool sensor sensing the presence of the filmstrip on the take-up spool prevents the initializing mechanism from initializing the counter. This allows the counter to continue its frame count after the door is re-closed should the photographer wish to salvage any unexposed frames.

REFERENCES:
patent: 3511153 (1970-05-01), Steisslinger et al.
patent: 3925798 (1975-12-01), Sanada et al.
patent: 4281911 (1981-08-01), Engelsman et al.
patent: 4362370 (1982-12-01), Iwata et al.
patent: 4416525 (1983-11-01), Chan
patent: 4494842 (1985-01-01), Kimura et al.

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