RFID Tag Conductive Terminals Welded to Metal
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Solution Overview
Problem
RFID tags attached to metal surfaces using adhesives are prone to detachment due to environmental factors and may release volatile chemicals during high-temperature sterilization, making them unsuitable for medical instruments.
Innovation Solution
An RFID tag design featuring a coil-shaped or loop-shaped conductor with an RFIC integrated into a conductive element, where the terminals are welded to the metal article instead of using adhesives, providing magnetic coupling for communication and preventing gas release.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If adhesive is used to attach RFID tag to metal surface, then attachment is simple and low-cost, but environmental resistance deteriorates and detachment occurs easily
Solution Approach 1:
The patent replaces the chemical bonding system (adhesive) with a direct mechanical/electrical connection system (conductive adhesive or welding). The RFID tag's conductor is directly connected to the metal article through a conductive adhesive layer that provides both electrical connection and mechanical bonding, eliminating the need for separate adhesive layers and improving environmental resistance.
2Ease of manufacture
If adhesive is used to attach RFID tag to metal surface, then attachment process is simple, but reliability under high temperature deteriorates due to out gas release
Solution Approach 1:
The patent replaces organic adhesive materials with inorganic conductive materials or metal-based conductive adhesives that do not release volatile organic compounds (VOCs) when exposed to high temperatures. This substitution eliminates out gas release during sterilization processes while maintaining the simplicity of the attachment process.
Solution Approach 2:
The patent changes the material parameters of the conductive adhesive layer by selecting materials with high thermal stability and low out gas release characteristics. The conductive adhesive is formulated to maintain its bonding and conductive properties at high temperatures (e.g., 121°C or higher sterilization temperatures) without degrading or releasing harmful gases.
3Use of energy by moving object
If conductor is wound in tight coil shape, then inductance increases, but manufacturing precision requirements increase
Solution Approach 1:
The patent segments the conductor into multiple separate conductive elements (first conductor, second conductor, third conductor) that are positioned at specific locations on the substrate rather than forming a continuous tight coil. This segmentation allows for easier manufacturing while maintaining the necessary inductance through the arrangement and coupling of multiple conductive elements.
Solution Approach 2:
The patent transitions from a one-dimensional tight coil winding to a two-dimensional arrangement of conductive elements on the substrate surface. The conductors are positioned at specific coordinates and connected through vias or conductive pathways, allowing inductance to be achieved through spatial arrangement rather than tight winding, thereby reducing manufacturing precision requirements.
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 enhances environmental resistance and prevents gas release, ensuring a stable and reliable RFID tagged article even in high-temperature environments.
Implementation Method 1
An RFID tag design featuring a coil-shaped or loop-shaped conductor with an RFIC integrated into a conductive element, where the terminals are welded to the metal article instead of using adhesives, providing magnetic coupling for communication
Data Source
AI summary
An RFID tag includes a first conductor and second conductors that are connected to each other to provide a main portion or all of a coil-shaped conductor or a loop-shaped conductor. Moreover, an RFIC is connected to the second conductors or is electromagnetically coupled to the second conductors. The first conductor includes terminals provided such that an end projects outward from a winding range of the coil-shaped conductor or a loop-shaped conductor while the first conductor is connected to the second conductors.