Importance

Loading Importance Indicators...

Abstract

A protection system against the unauthorized use of an access key with electronic identification that, when is active, prevents the recognition of the original access key. This is done by disturbing the transfer of the code by magnetic induction from the circuit incorporated in the key to the device of contactless powering and recognition of the identification code installed in the lock. A code information corrupting disturbance in produced by a device of directionally emitting electromagnetic energy toward the point of space of magnetic coupling between a primary winding of an air transformer of the recognition device of the lock and the secondary winding of the air transformer coupled to an integrated circuit contained in the key. The emitting device acts from a distance that may be even larger than one meter from the so equipped lock.

Loading the Abstract Image...

First Claim