Security Tag Triggering with Dual-Signal Sequence Detection
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Solution Overview
Problem
Existing security tags that trigger an alarm upon removal from a retail store are ineffective in deterring theft, as thieves can evade security measures and remove the tags at a remote location, and benefit denial tags risk accidental triggering, damaging legitimate items.
Innovation Solution
A method involving dual trigger signals in defined areas, with a predefined sequence detection, activates a theft deterrent module only upon a specific signal pattern, including a delay to prevent accidental triggering, using RF, acousto-magnetic, or electromagnetic signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a single trigger signal is used to activate the security tag, then the activation is simple and quick, but the risk of accidental triggering increases
Solution Approach 1:
The trigger signal is segmented into two distinct parts: a first trigger signal and a second trigger signal. The security tag requires detection of both signals in sequence to activate the theft deterrent module. This segmentation ensures that a single accidental exposure to a trigger signal will not activate the tag, thereby reducing false positives while maintaining quick activation when both signals are properly received.
2Reliability
If a benefit denial security tag is used to damage or mark the item, then theft deterrence is improved, but the risk of damaging legitimate items increases
Solution Approach 1:
Before the theft deterrent module is activated, the system performs preliminary verification by requiring the security tag to detect both a first trigger signal and a second trigger signal in sequence. This preliminary action of dual-signal verification ensures that only intentional theft attempts (where the thief deliberately bypasses both signal zones) will activate the damage mechanism, while legitimate customers who accidentally trigger one signal will not cause item damage.
3Speed
If the security tag activates immediately upon trigger detection, then response time is reduced, but the likelihood of accidental activation increases
Solution Approach 1:
The system employs periodic action by requiring the security tag to detect signals in a specific sequence (first trigger signal followed by second trigger signal) within a predetermined time period. This periodic verification process maintains fast response time when theft is detected while filtering out accidental activations, as the sequential detection requirement ensures deliberate action is taken to trigger the alarm.
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
Effectively deters theft by ensuring the security tag is triggered only when a predefined sequence of signals is detected, reducing accidental activation and protecting legitimate items from damage.
Implementation Method 1
each of the first and second trigger signals is one of an RF signal, an acousto-magnetic signal or an electromagnetic signal
Implementation Method 2
each of the first and second trigger signals is one of an RF signal, an acousto-magnetic signal or an electromagnetic signal
Data Source
AI summary
A method of triggering a security tag attached to an article for deterring theft of said article comprises: emitting a first trigger signal in a first defined area; emitting a second trigger signal in a second defined area, the second trigger signal being different from the first trigger signal; providing a security tag including an activation sensor configured to detect the first and second trigger signals and control circuitry configured to trigger a theft deterrent module of the security tag upon detection of a trigger signal sequence comprising detection of the second trigger signal within a predefined time period after detection of the first trigger signal.