Registers – Coded record sensors – Particular sensor structure
Reexamination Certificate
2005-06-07
2005-06-07
Lee, Diane I. (Department: 2876)
Registers
Coded record sensors
Particular sensor structure
C340S572100
Reexamination Certificate
active
06902110
ABSTRACT:
In general, the invention is directed to techniques for creating and controlling a magnetic field for use with electronic article surveillance (EAS) markers. In particular, the techniques make use of current switching devices to generate a signal having one or more current pulses for creating the magnetic field. An electronic article surveillance (EAS) system includes a coil to create a magnetic field for changing a status of an EAS marker and a drive unit to output a signal having one or more current pulses for energizing the coil. A programmable processor within the EAS system controls the drive unit to generate the output signal according to a desired profile. By selectively activating and deactivating current switching devices within the drive unit, the processor can direct the drive unit to generate the output signal according to a desired profile having a number of current pulses of different amplitudes and direction.
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Belka Anthony Michael
Goff Edward David
Zarembo Peter John
3M Innovative Properties Company
Buss Melissa E.
Lee Diane I.
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