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Holographic verification system with indexed memory

  • US 4,163,290 A
  • Filed: 02/08/1974
  • Issued: 07/31/1979
  • Est. Priority Date: 02/08/1974
  • Status: Expired due to Term
First Claim
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1. A binary data storage and retrieval system for the high-speed determination of the presence or absence of a given information unit comprising an elongate strip having a multiplicity of individual holograms evenly distributed over a plurality of elongate hologram channels on the strip, the holograms defining a holographic memory, each hologram being a holographic record of a binary spot pattern;

  • a light source for generating binary spot patterns from holograms in any one of the channels by illuminating holograms belonging to such channel only;

    means for detecting such generated spot patterns;

    the strip including holographic index means identifying the holograms in each channel for selecting the channel in which the information unit would be recorded if present in the memory;

    means for directing light from the source to the selected channel; and

    advancing means cooperating with the light directing means for first searching the index, thereafter directing the light to the selected channel and thereafter reading the memory.

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