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Self-clocking encoding/decoding film information exchange system using dedicated magnetic tracks on film

  • US 4,977,419 A
  • Filed: 10/07/1988
  • Issued: 12/11/1990
  • Est. Priority Date: 10/07/1988
  • Status: Expired due to Term
First Claim
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1. In an elongate photographic film strip susceptible of exposure of successive frames thereof in a camera having a magnetic reading or writing system and adapted for printing by a photofinishing device having a magnetic reading or writing system, the improvement comprising:

  • a virtually transparent magnetic layer; and

    longitudinal parallel tracks magnetically recorded in said magnetic layer, said tracks comprising self-clocking three-part encoded data, each of said tracks beginning and ending within a particular frame, and each of said tracks further comprising first and second three-part encoded binary characters uniquely representing start and stop sentinels respectively, whereby said film strip may be transported at different velocities with respect to the magnetic reading or writing means in said camera and in said photofinishing device and whereby the direction of film strip transport can be automatically detected through said start and stop sentinels.

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