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HOLOGRAM IDENTIFICATION SYSTEM

  • US 3,735,374 A
  • Filed: 06/25/1970
  • Issued: 05/22/1973
  • Est. Priority Date: 07/09/1969
  • Status: Expired due to Term
First Claim
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1. A hologram identification system, for identifying objects carrying at least one hologram key means storing a pattern of interference fringes constructed from light beams respectively emitted by m point reference sources and focused on n luminous object points;

  • the locations of said point sources and said object points in relation to said hologram key means being characteristic of a predetermined correspondence code ;

    said identification system comprising;

    m point light sources and n point photo-detectors located in respective predetermined locations determined by said correspondence code, m and n being positive integers higher than one;

    means for positioning said hologram key means in a location where said hologram key means actually focuses said sources onto said photo-detectors ;

    logic circuit means connected to said photo-detectors and having an output for supplying a first control signal when, upon insertion of said hologram key means in said location, said n photodetectors simultaneously supply respective signals ; and

    supply mans for supplying electrical energy to said sources and said logic circuit means.

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