Electrical transmission or interconnection systems – Vehicle mounted systems – Automobile
Patent
1994-06-06
1996-07-02
Shoop, Jr., William M.
Electrical transmission or interconnection systems
Vehicle mounted systems
Automobile
180287, 34082531, B60R 2500
Patent
active
055325220
ABSTRACT:
A transponder embedded in a key and a reader/exciter coil surrounding the lock cylinder are inductively linked to provide energization to the transponder, causing it to emit a digital identification code. A control circuit associated with the coil supplies energizing coil current and analyzes the emitted code to verify the authenticity of the key. The coil and control circuit are contained in a planar multi-layer hardboard printed circuit having high circuit integrity and being very thin for accommodation in the lock assembly. Alternatively, the coil and control circuit are contained in a flexible printed circuit. There the coil includes two opposed elongated legs which are positioned on opposite sides of the lock cylinder and folded in a way to conform to the cylinder surface, forming in effect a very thin cylindrical coil. An extension on the printed circuit form a path to the control circuit which is remote from the cylinder.
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patent: 4918955 (1990-04-01), Kimura et al.
patent: 4980680 (1990-12-01), Knoll et al.
patent: 5023605 (1991-06-01), McColl
patent: 5111199 (1992-05-01), Tomoda et al.
patent: 5311757 (1994-05-01), Spahn
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patent: 5461386 (1995-10-01), Knebelkamp
Basche Stephen M.
Dietz George J.
Hammer Randall E.
Hawes Kevin J.
Delco Electronics Corp.
Elms Richard T.
Navarre Mark A.
Shoop Jr. William M.
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