Camera

Details Camera Camera

1994-12-19

1997-03-25

Gray, David M.

Photography

With data recording

Magnetically on film or film cassette

G03B 1724

Patent

active

056149697

ABSTRACT:
A camera adapted for using a film cartridge of the kind having a magnetic recording part provided for each frame portion of a film contained therein is arranged to write information into the recording part every time a shot is taken for each frame. In case where the film contained in the film cartridge is used only halfway, the camera makes a search for the beginning part of unexposed frame portions by detecting the amount of information recorded in the magnetic recording part of each frame portion. For this purpose, a reference value to be used in making a discrimination between an exposed state and an unexposed state is set on the basis of the amount of information obtained from each frame and also according to the amounts of noises, etc. The arrangement disclosed enables the camera to accurately carry out the search for the unexposed frame portions of the film.

REFERENCES:
patent: 5220367 (1993-06-01), Matsuyama
patent: 5281987 (1994-01-01), Nagata
patent: 5302986 (1994-04-01), Kazami

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