PROXIMITY DETECTING APPARATUS

A proximity detection system which combines the advantages of an electrostatic (electric) field coupling mechanism with those of an electromagnetic coupling mechanism in order to overcome the disadvantages of the respective individual coupling mechanisms. The system includes a coded tag which is exc...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	DALE LINDSETH, THEODORE D. GEISZLER
Format:	Patent
Sprache:	eng
Schlagworte:	ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDEDFOR ELSEWHERE CALCULATING CHECKING-DEVICES CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTINGELECTRIC POWER COMPUTING CONVERSION OR DISTRIBUTION OF ELECTRIC POWER COUNTING ELECTRIC COMMUNICATION TECHNIQUE ELECTRICITY GENERATING RANDOM NUMBERS GENERATION HANDLING RECORD CARRIERS PHYSICS PRESENTATION OF DATA RECOGNITION OF DATA RECORD CARRIERS REGISTERING OR INDICATING THE WORKING OF MACHINES SYSTEMS FOR STORING ELECTRIC ENERGY TIME OR ATTENDANCE REGISTERS TRANSMISSION VOTING OR LOTTERY APPARATUS
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Beschreibung
Zusammenfassung:	A proximity detection system which combines the advantages of an electrostatic (electric) field coupling mechanism with those of an electromagnetic coupling mechanism in order to overcome the disadvantages of the respective individual coupling mechanisms. The system includes a coded tag which is excited with an induction field, i.e., by using an electromagnetic coupling mechanism as has been done in the past in such proximity identification systems, but which transmits stored data back to the receiver using both an electric field coupling mechanism and an electromagnetic field coupling mechanism. The receiver, in turn, is provided with a novel preamplifier circuit arrangement, so that it can simultaneously receive signals via either or both of these coupling mechanisms.