EAS Tag with Switch and Alarm Circuit for Tamper Detection
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Solution Overview
Problem
Conventional electronic article surveillance (EAS) tags are vulnerable to tampering and lack a mechanism to trigger an alarm when attempted to be tampered with, allowing unauthorized removal of articles from secured spaces.
Innovation Solution
The proposed article surveillance tag includes a housing with a switch and a processing circuit that triggers an alarm upon detecting electrical disconnection between contacts, providing enhanced security by preventing unauthorized removal and tampering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional EAS tags use a simple mechanical locking mechanism with a tack and locking elements, then the device complexity is reduced and ease of manufacture is improved, but the reliability is worsened because the tags are easy to tamper and lack alarm functionality
Solution Approach 1:
The patent replaces the purely mechanical locking mechanism with an electromechanical system that includes a magnet, ferromagnetic locking member, and electronic alarm circuit. The magnet provides non-contact holding force for the locking member, while the electronic circuit detects tampering and triggers an alarm, thereby enhancing reliability without requiring complex mechanical interlocking mechanisms.
Solution Approach 2:
The patent introduces a ferromagnetic locking member as an intermediary between the magnet and the tack. This locking member is attracted to the magnet to provide secure attachment, yet can be easily manipulated by a magnet applied from the outside to release the tack, providing both security and authorized removal functionality.
2Object-affected harmful factors
If conventional EAS tags lack alarm functionality, then the device complexity is reduced, but the object-generated harmful factors worsen because unauthorized removal cannot be detected
Solution Approach 1:
The patent implements a feedback mechanism where the alarm circuit continuously monitors the magnetic field or electrical connection status of the locking mechanism. When tampering is detected (such as when the locking member is displaced or electrical contacts are broken), the circuit triggers an audible alarm to alert security personnel of unauthorized removal attempts.
Solution Approach 2:
The alarm system is designed to be self-activating through simple detection mechanisms. The electronic circuit automatically detects tampering conditions and triggers the alarm without requiring external monitoring or complex processing, allowing the tag to self-report security violations.
3Ease of operation
If the locking member is made ferromagnetic to enable magnetic release, then the ease of operation is improved for authorized removal, but the reliability is worsened because the locking mechanism becomes vulnerable to external magnetic interference
Solution Approach 1:
The patent positions the magnet within the housing to create a pre-established magnetic field that continuously holds the ferromagnetic locking member in the locked position. This preliminary magnetic action ensures the locking mechanism remains secure during normal handling, while still allowing authorized removal by applying an external magnet to overcome the holding force.
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 tag effectively prevents unauthorized removal of articles by triggering an alarm when tampering is detected, thereby enhancing security measures in retail spaces or controlled areas.
Implementation Method 1
The locking member is made of ferromagnetic material... a magnet is used to pull the locking member and locking elements
Implementation Method 2
The locking member and the locking elements are attached to a spring. The spring remains in an uncompressed state when the tag is active
Data Source
AI summary
The present disclosure relates generally to security tags, and more specifically relates to electronic article surveillance (EAS) tags. The tag prevents unauthorized removal of an article as well as triggers an alarm when the tag is attempted for tampering. The tag comprises a housing, a switch, and a processing circuit. The switch includes a first contact coupled with the housing and a second contact coupled with an article. The second contact is movable relative to the first contact. The processing circuit is provided to detect electrical disconnection between the first contact and the second contact, and trigger an alarm upon detecting the electrical disconnection.