Metallized Card Layer ESD Blocking via Local Quality
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Solution Overview
Problem
Laminated cards with metallized layers can conduct electrostatic discharge (ESD), potentially damaging electronic devices when used, as electrostatic energy passes through these layers during routine use.
Innovation Solution
A laminated core stock sheet with a core substrate layer and an intermediate filmic layer containing a conductive material is used, where the conductive material is deposited at a thin thickness to prevent ESD conduction, providing security, decorative, or functional features while blocking electrostatic discharge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a metallized layer is added to provide security and decorative features, then the card's security and aesthetic value improve, but the card becomes conductive to electrostatic discharge which can damage electronic devices
Solution Approach 1:
The patent applies local quality by creating a metallized layer with non-uniform thickness distribution. The layer has thinner regions that provide ESD blocking capability while maintaining overall metallization for security and decorative functions. This localized variation in thickness allows different regions of the same layer to serve different functions: thicker regions provide security features while thinner regions prevent ESD conduction.
Solution Approach 2:
The patent utilizes parameter changes by controlling the thickness parameter of the metallized layer. By depositing metal at varying thicknesses (e.g., 0.5 nm to 5 nm in thinner regions versus thicker regions), the electrical conductivity parameter is modified locally. This parameter variation enables the layer to simultaneously provide security features (requiring metallization) and prevent ESD conduction (requiring thin/non-conductive regions).
2Object-affected harmful factors
If the conductive material thickness is increased to improve ESD blocking, then the ESD protection improves, but the reflective and holographic features deteriorate
Solution Approach 1:
The patent applies local quality by creating specific thin regions within the metallized layer that have optimized thickness for maintaining reflective properties. These localized thin regions (e.g., 0.5-2 nm) preserve optical characteristics while the overall layer structure provides ESD blocking. Different regions of the metallized layer have different thicknesses tailored to their specific functions.
Solution Approach 2:
The patent employs composite materials by combining the metallized layer with additional layers (such as dielectric layers or protective coatings) to create a multi-layer composite structure. This composite approach allows the metallized layer to provide ESD blocking while the combined structure maintains reflective and holographic features through the interplay of multiple materials with different optical and electrical properties.
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 effectively prevents electrostatic discharge through the laminated cards, ensuring they do not damage electronic devices while maintaining reflective or holographic features for security and authenticity verification.
Implementation Method 1
The conductive material has a small thickness within the intermediate filmic layer such that the intermediate filmic layer prevents conduction of electrostatic discharge (ESD) through the intermediate filmic layer and outside of the individual cards
Implementation Method 2
The conductive material of the intermediate filmic layer is configured to permit electromagnetic waves that are wirelessly communicated with RFID devices disposed inside the individual cards through the intermediate filmic layer
Data Source
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AI summary
A laminated core stock sheet for use in a composite laminate assembly that is separated into individual cards is provided. The sheet includes a core substrate layer and an intermediate filmic layer coupled to the core substrate layer. The intermediate filmic layer includes a conductive material that provides a security, decorative, or functional feature of the cards. The core substrate layer and the intermediate filmic layer are coupled with another laminated core stock sheet to form the composite laminate assembly. The conductive material has a small thickness within the intermediate filmic layer such that the intermediate filmic layer prevents conduction of electrostatic discharge (ESD) through the intermediate filmic layer and outside of the individual cards.