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Optical key security access system

  • US 5,283,431 A
  • Filed: 02/04/1992
  • Issued: 02/01/1994
  • Est. Priority Date: 02/04/1992
  • Status: Expired due to Fees
First Claim
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1. A new and improved optical key security access system comprising:

  • photo-sensitive means for receiving and detecting at least one light beam, said photo-sensitive means comprising a two-dimensional imaging array;

    illumination means for sending at least one light beam to said imaging array; and

    key means positionable between said illumination means and said imaging array, said key means including an integral material through which said at least one light beam passes, said integral material serving to reorient said at least one light beam whereby said integral material causes said light beam to impinge upon a preselected portion of said imaging array, said integral material comprising optically transmissive gradient refractive index material for reorienting said at least one light beam to impinge upon a preselected portion of said imaging array, and signal processing means responsive to the output of said imaging array to compare a signal representing said preselected portion of said imaging array with a predetermined encoded signal.

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