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Security system employing optical key shape reader

  • US 4,868,559 A
  • Filed: 10/02/1987
  • Issued: 09/19/1989
  • Est. Priority Date: 10/02/1987
  • Status: Expired due to Fees
First Claim
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1. A security system comprising:

  • means for photoelectrically deriving an electrical signal from a shape characteristic of a key said shape characteristic being the cuts of varying depth on one edge of the shaft of the key, a single linear series of holes of varying diameter in the shaft of the key, or a single linear series of slots of varying heights in the shaft of the key;

    means remote from said photoelectrical means for comparing said electrical signal to one or more electrical signals stored in memory to determine whether they are the same; and

    means for enabling a function upon determination that said photoelectrically derived electrical signal is the same as said electrical signal stored in memory.

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