RFID Anti-Tamper Device with Bi-Stable Visual Indicator
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Solution Overview
Problem
Existing article surveillance systems using RFID tags lack a visual indicator for deactivation, leading to false alarms and increased costs due to the need for a separate power source for visual indicators.
Innovation Solution
An anti-tamper device combining an RFID component with a bi-stable display element that indicates tampering without requiring a battery or external power, using a microchip, antenna, and capacitor to provide a visual indication of the RFID component's intactness through a change in voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separate power source is used for visual indicators, then visual indication of RFID tag status is achieved, but system cost and complexity increase
Solution Approach 1:
The patent combines the RFID tag circuit and visual indicator into a single integrated device. The RFID tag's existing power and circuitry are merged with the visual indicator components, eliminating the need for separate power sources and reducing overall system complexity while maintaining reliable visual indication of tag status
Solution Approach 2:
The RFID tag is designed to perform multiple functions: identification, authentication, and visual indication of operational status. By making the tag multi-functional, the patent eliminates the need for separate dedicated visual indicator devices, thereby reducing system complexity and cost while improving reliability through integrated design
2Device complexity
If traditional security tags are used without visual indicators, then system cost is reduced, but false alarms increase due to inability to verify deactivation
Solution Approach 1:
The patent employs color-changing visual indicators (such as LED lights or color-changing materials) that display different colors based on the RFID tag's operational status. This provides immediate visual verification of deactivation, eliminating false alarms while keeping the system simple and cost-effective
Solution Approach 2:
The RFID tag itself provides the visual indication function without requiring external monitoring equipment or additional verification systems. The tag self-verify its deactivation status through integrated visual indicators, eliminating false alarms while maintaining system simplicity
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
The solution provides a cost-effective, visual confirmation of RFID tag deactivation, reducing false alarms and overall system costs by eliminating the need for a separate power source, while ensuring accurate tampering detection.
Implementation Method 1
a capacitor to provide power for a change in the display element
Implementation Method 2
an antenna operably coupled to the chip
Data Source
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Figure 4~5
AI summary
An anti-tamper device combining a RFI D component and an article surveillance or security component with a visual indicator. The article surveillance or security component is operatively coupled to a display so that an interruption of the RFI D component is visibly indicated by the display. The visual indicator moves between a first state indicating a lack of tampering, and a second state indicating tampering without the need for a battery or external power source.