Registers – Records – Conductive
Patent
1998-02-24
2000-06-06
Lee, Michael G
Registers
Records
Conductive
235384, 235451, 343895, 340572, G06K 1906
Patent
active
060708034
ABSTRACT:
A reading device and one or more associated transponders are used for non-contact identification of persons or objects. When a transponder is moved into the vicinity of the reading device, the reading device receives and evaluates data sent from the transponder. To provide the maximum distance between the reading device (or the antenna thereof) and the transponder, an automatic tuning device is employed to adjust a resonant circuit of the reading unit to match or approximately match a resonance frequency (fo) of the transponder by tuning the reading unit to a preset frequency which matches the frequency (fo) of the transponder. The tuning unit compensates for external influences caused by the environment in which the reading unit is installed, thereby preventing the resonant circuit of the reading unit from deviating from the optimum resonance frequency of the transponder.
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