Implicit mid roll interrupt protection code for camera using ded

Details Implicit mid roll interrupt protection code for camera using ded Implicit mid roll interrupt protection code for camera using ded

1989-12-05

1991-04-09

Mathews, A. A.

Optics: motion pictures

Removable film strip magazine type

354 76, 354207, 354217, 352 92, 352235, 352236, 360 1, G03B 1724

Patent

active

050068733

ABSTRACT:
A virtually transparent magnetic layer is included as an additional layer in a color negative film. Information exchange between various users of the film--such as (for example) the film manufacturer, the camera user, the dealer and photofinisher--is carried via plural longitudinal magnetic tracks on the film that begin and end in individual frames. Each track is dedicated to the writing and reading of a predetermined set of parameters related to the corresponding frame. All data is recorded as N-bit character where N is preferably six. Each track is preceeded by certain six-bit character called an ID sentinel. On-film magnetic data recording by the film manufacturer uses an ID sentinel different from that employed in the camera. The camera automatically prevents exposure of any frame bearing a camera ID sentinel, thus providing protection from double exposures.

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