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Vehicular anti-theft system

  • US 4,868,409 A
  • Filed: 11/28/1988
  • Issued: 09/19/1989
  • Est. Priority Date: 11/14/1986
  • Status: Expired due to Term
First Claim
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1. A vehicular anti-theft system, comprisinga key device having a shank and a casing, said casing connected to a base end of the shank and adapted to be held between fingers of a user, the casing of the key device being provided with a light emitting element which emits a code light signal;

  • a key hole provided on a vehicle to receive the shank of the key device therein from an open end of the key hole;

    a light receiving element provided adjacent to the open end of the key hole to receive the code light signal from the light emitting element when the shank of the key device is fitted into the key hole; and

    control means connected to the light receiving element for receiving a code signal from the light emitting element;

    the control means being provided with light code matching means which enables a device mounted on the vehicle when the code signal from the light receiving element matches with an internal code;

    wherein only one light emitting element is provided on the housing of the key device and only one light receiving element is provided adjacent to the open end of the key hole, a light conducting ring being provided around the open end of the key hole to conduct the code light signal from the light emitting element to the light receiving element irrespective of the orientation of the shank of the key device relative to the key hole.

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