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CODED DATA STORAGE MEDIUM

  • US 3,660,641 A
  • Filed: 10/30/1969
  • Issued: 05/02/1972
  • Est. Priority Date: 10/30/1969
  • Status: Expired due to Term
First Claim
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1. Coded information storage means for use in searching a listing of multi-integer identifiers to determine by direct optical comparison if a particular multi-integer identifier is included, the coding of said particular multi-integer identifier being represented by a row of aligned light conducting and nonlight conducting regions position encoded to represent the particular multi-integer identifier, said storage means comprising a strip of film for reading by moving through a spaced formed by and between a light source and a light sensing unit, said light source and light sensing unit being located on opposite sides of the row of aligned light conducting and nonlight conducting regions that represent the particular multiinteger identifier, and means forming a plurality of distinct optically detectable photographically recorded dot images position encoded on the film strip, said dot images including a plurality of parallel spaced columns of aligned dot images extending transversely across the film strip at an angle relative to the length thereof, the dot images in each column being position encoded therein in groups with at least two dot images in each group, the positions of the dot images in each group being position encoded therein according to a constant ratio code to represent an integer of a multi-integer identification indicia, each of said parallel columns having the same number of dot images therein to encode the same number of integers of a multi-integer indicia and all of the dot images in each row being positioned in alignment to be simultaneously read as the column moves into registration with the row of aligned light conducting and non-light conducting regions that represent the particular identifier being searched and in the space between the light source and the light sensing unit, the position encoding of the dot images on the film strip being complementarily encoded as compared to the encoding of the light conducting and non-light conducting regions representing the particular identifier so that only direct optical comparison of encoding representing the same identifier and indicia will be able to prevent light from the liGht source from reaching the light sensing unit during movement of the film strip therebetween.

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