Acousto-Magnetic Ferrite EAS Marker Deactivation via RFID Detuning

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Solution Overview

Problem

Conventional deactivation processes for EAS security tags or markers are inconvenient for self or mobile checkout due to high power and complexity of the deactivation electronics required.

Innovation Solution

A combined RFID and AM component system where the RFID component receives POS messages to deactivate the AM component by detuning the LC circuit, using a latching core or switch component to alter the resonant frequency outside the EAS system's detection range.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If conventional deactivation processes are used for EAS security tags, then the security tag can be deactivated, but the deactivation electronics require high power and complexity making them inconvenient for self or mobile checkout

Engineering Contradiction:

Improveconvenience of deactivationVSAvoidcomplexity of deactivation electronics

Core Design Contradiction:

Ease of operationVSDevice complexity

Solution Approach 1:

The patent combines the RFID and EAS components into a single integrated marker. The RFID component uses the same antenna and circuitry as the EAS marker, eliminating the need for separate deactivation electronics. When the RFID component receives a deactivation signal, it generates a detuning signal that shifts the resonant frequency of the EAS LC circuit, deactivating the marker without requiring additional complex deactivation hardware.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The RFID component serves multiple functions: it acts as both an RFID transponder for identification and a deactivation mechanism for the EAS system. The same antenna and circuit elements are used for both RFID communication and EAS detection, with the RFID component additionally generating the detuning signal to deactivate the EAS marker when needed.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Ease of operation

If conventional deactivation processes are used for EAS security tags, then the security tag can be deactivated, but the high power requirements make them unsuitable for mobile checkout

Engineering Contradiction:

Improvesuitability for mobile checkoutVSAvoidpower consumption of deactivation electronics

Core Design Contradiction:

Ease of operationVSUse of energy by moving object

Solution Approach 1:

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The RFID component deactivates the EAS marker itself by generating the detuning signal. The RFID component uses its own circuitry to produce the frequency shift that deactivates the EAS LC circuit, eliminating the need for external high-power deactivation electronics and enabling mobile checkout applications.

Inventive Principle:

Principle #25Self-service

3Reliability

If the RFID component detunes the resonant circuit to disable the EAS, then deactivation is achieved, but the resonant frequency must be shifted outside the EAS system's detection range

Engineering Contradiction:

Improveeffectiveness of deactivationVSAvoidcomplexity of frequency detuning mechanism

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent changes the resonant frequency parameter of the EAS LC circuit by introducing a detuning signal from the RFID component. The detuning signal shifts the resonant frequency outside the detection range of the EAS system, reliably deactivating the marker. This is achieved by modifying the electrical characteristics of the LC circuit through the RFID component's signal generation capability.

Inventive Principle:

Principle #35Parameter changes

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

Enables convenient and efficient deactivation of EAS security tags or markers at the point of sale, reducing the need for complex electronics and allowing seamless passage through surveillance zones without triggering alarms.

Implementation Method 1

the RFID component generates a detuning signal to shift a resonant frequency of the EAS component outside of a detection range of the EAS system

Methodology Applied

Scientific EffectResonance: Resonance

Implementation Method 2

using a latching core or switch component to alter the resonant frequency outside the EAS system's detection range

Methodology Applied

Scientific EffectMagnetic property change: Ferromagnetism

Data Source

PatentEP3762907B1Systems and methods for radio frequency identification enabled deactivation of acousto-magnetic ferrite based marker

Publication Date: 2025.10.15 SENSORMATIC ELECTRONICS CORP

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AI summary

Systems and methods for deactivating a marker comprising an Electronic Article Surveillance ("EAS") component and a Radio Frequency Identification ("RFID") circuit. The method comprises: receiving, by the RFID element of the marker, an RFID deactivation signal transmitted from an external device; responsive to the RFID deactivation signal, supplying power from the RFID element to an EAS detuner element so that the detuner element switches from a first state to a second state. The marker's resonant frequency is changed to a first value that falls outside of the EAS system's operating frequency range when the detuner element switches from the first state to the second state. The second state is maintained after power is no longer supplied to the detuner element.