Photocopying – Contact printing – Light boxes
Patent
1988-10-07
1990-12-11
Mathews, A. A.
Photocopying
Contact printing
Light boxes
354106, 355 40, 352236, G03B 1724, G03B 2752, G03B 2900
Patent
active
049774190
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. The photofinisher-dedicated tracts fill the exposed image area of each frame. The camera-dedicated tracks lie along the edges of the film between the film perforations, the perforations being widely spaced for this purpose. All data is recorded on the film using a novel self-clocking code which is completely self-clocking, in order to provide automatic data synchronization between the various users without requiring that any of them to transport the film at the same speed or even at a uniform speed when reading and writing. A start sentinel character and stop sentinel character, each having a predetermined self-clocking encoded binary bit sequence, are placed at the beginning and end of each track respectively, and facilitate automatic detection of film transport direction.
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Research Disclosure, 1984, H. J. Krall, "Magnetically Positioned Photographic Film".
Eastman Kodak Company, Data Code Magnetic Control Surface, 1983.
Wash Michael L.
Whitfield Arthur A.
Boos, Jr. Francis H.
Eastman Kodak Company
Mathews A. A.
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