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HOLOGRAPHIC SYSTEM FOR SUBJECT RECOGNITION PERMITTING CONVERSION OF A PATTERN INTO A MACHINE-READABLE FORM

  • US 3,764,979 A
  • Filed: 08/03/1971
  • Issued: 10/09/1973
  • Est. Priority Date: 08/13/1965
  • Status: Expired due to Term
First Claim
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1. An optical character reader comprising:

  • a hologram having a plurality of interference patterns photographically recorded thereon, each interference pattern being formed by the interference of first and second associated electromagnetic wavefront patterns, said first wavefront patterns emanating from said characters and said second wavefront patterns emanating from groups comprised of a plurality of discrete and separate point sources of electromagnetic wavefronts where each said group forms a unique code representing a different one of said characters, a display means including a medium containing a plurality of said characters, said characters being related to said first electromagnetic wavefront patterns which formed said interference patterns of said hologram, a source of substantially coherent light, means for sequentially positioning said characters on said medium in the path of said coherent light, each of said characters scattering said coherent light into electromagnetic wavefronts, said electromagnetic wavefront patterns from each of said characters being related to said first electromagnetic wavefront patterns which formed said interference patterns of said hologram, an optical system for sequentially directing said electromagnetic wavefront patterns scattered by the characters on said medium onto said hologram, said electromagnetic wavefront patterns scattered by said characters and sequentially directed onto said hologram coacting with said interference patterns on said hologram to produce images of said second associated electromagnetic wavefront patterns emanating from said discrete point sources, said images being representative of said unique codes of the characters on said medium, and means responsive to each of said images of said second associated electromagnetic wavefront patterns to produce electrical signals representative of said codes of the characters on said medium.

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