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Self-clocking encoding/decoding film information exchange system using dedicated magnetic tracks on film    
United States Patent4977419   
Link to this pagehttp://www.wikipatents.com/4977419.html
Inventor(s)Wash; Michael L. (Pittsford, NY); Whitfield; Arthur A. (Rochester, NY)
AbstractA 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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Drawing from US Patent 4977419
Self-clocking encoding/decoding film information exchange system using dedicated magnetic tracks on film - US Patent 4977419 Drawing
Self-clocking encoding/decoding film information exchange system using dedicated magnetic tracks on film
Inventor     Wash; Michael L. (Pittsford, NY); Whitfield; Arthur A. (Rochester, NY)
Owner/Assignee     Eastman Kodak Company (Rochester, NY)
Patent assignment
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Publication Date     December 11, 1990
Application Number     07/254,987
PAIR File History     Application Data   Transaction History
Image File Wrapper   Patent Term   Fees
Litigation
Filing Date     October 7, 1988
US Classification     396/311 352/236 355/40 396/319
Int'l Classification     G03B 017/24 G03B 027/52 G03B 029/00
Examiner     Mathews; A. A.
Assistant Examiner    
Attorney/Law Firm     Boos, Jr.; Francis H.
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Priority Data    
USPTO Field of Search     354/75 354/76 354/105 354/106 354/109 355/40 352/37 352/92 352/236 360/3 360/1 430/496 430/140 358/345 358/346
Patent Tags     self-clocking encoding/decoding film information exchange using dedicated magnetic tracks film
   
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