Importance

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Abstract

An electronic lock and key includes an electronic key which produces a specific electric signal such as a frequency signal, photo signal or logic signal when inserted into the key holder of the lock; and an electronic lock which is comprised of a power source, a key holder, a lock signal generator, and a signal comparing circuit that compares the signal of said key and the signal of said lock signal generator. The electronic lock and key further includes: a delay/switching circuit which supplies a power source to an unlocking device when the key is recognized as a proper key, an unlocking device which is controlled by a delay/switching circuit and which is actuated by the power source, and alarming circuit which is actuated when a key is recognized as a wrong key and when an excessive power voltage is applied, and a protecting circuit which operates to protect as the electronic lock and key circuitry from short circuits and excessive power voltages, when used with a vehicle, an alcohol sensing part, can be added to the starting system of a vehicle for preventing a driver from driving while intoxicated. A start/switching part is also provided between the signal comparing circuit and the starting system for controlling the start of the engine of the vehicle in accordance with the authenticity of the key and the operation of the alcohol sensing part.

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First Claim