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Two dimensional data encoding structure and symbology for use with optical readers

  • US 5,591,956 A
  • Filed: 05/15/1995
  • Issued: 01/07/1997
  • Est. Priority Date: 05/15/1995
  • Status: Expired due to Fees
First Claim
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1. An optically readable two dimensional bar code symbol, comprising:

  • a finder structure including a center and a plurality of squares which have centers that approximately coincide with said center and which are disposed in nested relationship to one another, each of said squares having first and second major axes which are substantially perpendicular to one another and which pass approximately through said center;

    a symbol descriptor structure encoding data indicating at least the overall symbol size and the length of the message encoded in said bar code symbol, said descriptor structure being located adjacent to said finder structure;

    a reference structure comprising at least two linear arrays of reference elements, said linear arrays having respective longitudinal axes that are oriented parallel to at least one of said first and second major axes;

    a data structure including a plurality of data blocks, said data blocks being concatenated to form layers that surround said finder structure;

    whereby the data blocks of said layers may be read sequentially within each layer and said layers may be read sequentially until all data has been read from said symbol.

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