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Method for optically encoding digital data on a substrate and the data record carrier formed thereby

  • US 4,532,616 A
  • Filed: 06/03/1982
  • Issued: 07/30/1985
  • Est. Priority Date: 06/03/1982
  • Status: Expired due to Fees
First Claim
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1. A method for optically encoding digital data on a substrate without timing or synchronization data to form a data record carrier including the steps of:

  • selecting an arcuate track path on the substrate;

    selecting a data cell length in the direction of the track for each bit of data to be stored in each cell on each track;

    selecting a cell width dimension transverse to the direction of the track;

    selecting a non-transition cell for one form of logic (0 or

         1) to be stored in each such cell;

    selecting a transition cell for the other form of logic (1 or

         0) to be stored in each such other cell;

    creating at least one track of digital data on the substrate comprised of a series of cells each having the same cell length in the direction of the track;

    establishing in each non-transition cell on the substrate a fully reflective surface or fully non-reflective surface;

    establishing in each transition cell on the substrate a reflective surface over part of the cell extending transverse to the direction of the track and a non-reflective surface over the other part of the cell extending transverse to the direction of the track, and creating a plurality of arcuate tracks of cells on said substrate with each track being spaced from an adjacent track by a predetermined distance at a point intermediate the ends of each track and each track having the same radius throughout the arcuate path of said track such that the tracks extend in an arcuate manner across the data record carrier with each track having the same radius and being arranged in a nested manner relative to adjacent tracks along a common centerline.

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