Flat Resonator Security Marker for Narrow Item Detection
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Solution Overview
Problem
Current Acousto-Magnetic (AM) EAS markers face challenges in tagging small, narrow items due to excessive clamping and frictional damping, which limits their size and detection performance, making it difficult to create markers smaller than the standard 10.5 mm width.
Innovation Solution
The solution involves designing a marker with a resonator having a flat planar cross-sectional profile, using a fillet or textured surface to reduce frictional contact, and modifying the bias element configuration to minimize magnetic clamping, allowing the resonator to oscillate freely and maintain adequate signal amplitude without the need for additional resonator components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If a traditional resonator with transverse curl is used, then the resonator stiffness is increased and magnetic clamping is overcome, but the marker width cannot be reduced below 10.5 mm
Solution Approach 1:
The resonator is changed from a traditional transverse curl configuration to a flat planar cross-sectional profile with longitudinal curvature. This parameter change in the resonator geometry allows the marker width to be reduced to 5-7 mm while maintaining sufficient stiffness through the longitudinal curve rather than transverse curl.
2Length of moving object
If a flat resonator ribbon is used in a narrow marker, then the marker width is reduced, but excessive clamping occurs leading to reduced amplitude
Solution Approach 1:
The bias magnet configuration is modified to provide localized magnetic field distribution that reduces excessive clamping at specific contact points. The bias magnet is positioned and dimensioned to create a magnetic field that biases the resonator without causing excessive localized clamping that would dampen oscillation amplitude in the narrow marker structure.
Solution Approach 2:
The resonator is given a longitudinal curvature along its length rather than relying on transverse curl. This dimensional change in the curvature direction allows the resonator to maintain stiffness and overcome magnetic clamping effects while fitting within the reduced 5-7 mm marker width, preventing excessive clamping and maintaining detection amplitude.
3Reliability
If additional resonator components are added to overcome clamping, then the amplitude is maintained, but the marker cost increases
Solution Approach 1:
The resonator geometry is changed to a flat planar cross-section with longitudinal curvature, which inherently provides the necessary stiffness to overcome magnetic clamping without requiring additional resonator components. This parameter change in the resonator design itself eliminates the need for extra parts, maintaining detection amplitude while avoiding increased marker cost.
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
This design enables the creation of smaller markers with sufficient amplitude for detecting smaller items without increased cost, overcoming the limitations of traditional markers by reducing damping and maintaining performance.
Implementation Method 1
the resonator will be biased by the first bias element when the marker is in use to oscillate at a frequency of a received transmit burst
Implementation Method 2
a first bias element adjacent to the second substrate so that the resonator will be biased by the first bias element
Data Source
AI summary
Systems and methods for making a marker. The methods comprise: disposing a resonator with a flat planar cross-sectional profile in a cavity formed in a first substrate partially defining a marker housing; sealing the cavity using a second substrate; placing a first bias element adjacent to the second substrate so that the resonator will be biased by the first bias element when the marker is in use to oscillate at a frequency of a received transmit burst; and using a physical structure in the cavity or a magnetic field passing through the cavity to reduce frictional forces between the resonator and at least the second substrate.