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Token and reader for vending machines

  • US 4,108,367 A
  • Filed: 02/25/1977
  • Issued: 08/22/1978
  • Est. Priority Date: 02/25/1977
  • Status: Expired due to Term
First Claim
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1. A token reader, comprisingmeans producing a holographic readout beam,means to guide a token containing a plurality of pairs of holograms into the path of said readout beam,two photodetectors positioned at predetermined spaced locations to receive respective first order beams from the holograms of an illuminated pair of holograms,an electrically-operated means for obliterating a pair of holograms on said token which are positioned in the path of said readout beam, andcomparator means operative upon the occurrence of equality of electrical outputs of said two photodetectors to actuate said means for obliterating holograms.

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