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Surface texture reading access checking system

  • US 4,677,435 A
  • Filed: 07/16/1985
  • Issued: 06/30/1987
  • Est. Priority Date: 07/23/1984
  • Status: Expired
First Claim
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1. An access control system comprising:

  • plural authorized support objects each having a relief surface texture;

    a reception block able to receive said support objects;

    a contact transducer provided in said reception block, said transducer being able to translate the relief surface texture into an electrical signal;

    a random access memory having plural memory locations, said random access memory being able to be connected to said transducer when an authorized support object is introduced into said reception block and to receive and store in one of said memory locations the corresponding electrical signal delivered by the transducer;

    a comparison circuit connected between the memory and the transducer, said comparison circuit determining the degree of coincidence between the signal supplied by the transducer when a random support object is introduced into the reception block and each of said signals stored in the memory locations of the memory; and

    a circuit connected to said comparison circuit and supplying, when a predetermined degree of coincidence is adequate, a signal initiating an access control action.

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