Viewfinder warning flag for photographic camera

Details Viewfinder warning flag for photographic camera Viewfinder warning flag for photographic camera

1995-04-05

1997-02-25

Rutledge, D.

Photography

With film drive

Film movement limiting means

396401, 396284, G03B 1700

Patent

active

056063857

ABSTRACT:
A film metering mechanism includes a metering slide that is released from a ready position by the pressing of a camera shutter release button such that the film metering slide is pulled by a drive spring and engages a shutter mechanism, temporarily opening the camera shutter, and at the same time is moved so an integral flag portion of the lever is visible in the camera viewfinder. As the film is moved to the next frame, the metering slide engages a perforation of the film and is pulled against the force of the drive spring by the film movement, moving the warning flag out of the viewfinder, until the metering slide returns to its initial position against a frame stop. Pressing the shutter release button disengages the metering slide from the film and starts the sequence over again.

REFERENCES:
patent: Re32391 (1987-04-01), Berg
patent: 2289800 (1942-07-01), Nagel
patent: 2750858 (1956-06-01), Marvin et al.
patent: 3688668 (1972-09-01), Ort
patent: 3696723 (1972-10-01), Ernisse
patent: 3820138 (1974-06-01), Horton
patent: 4492446 (1985-01-01), Zawodny et al.

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