Smart Card PCB Pre-Package for Planar Encapsulation
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Solution Overview
Problem
Existing smartcard technologies face challenges in efficiently incorporating non-planar electronic components while ensuring mechanical robustness, tamper resistance, and meeting size requirements, with current methods leading to component damage and complex insertion processes.
Innovation Solution
A pre-package structure for a flexible printed circuit board in smartcards, comprising a flexible printed circuit board encapsulated in a three-layer dielectric material package with a hardening layer having a higher VICAT softening temperature, ensuring protection and stability during lamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If discrete electronic components are incorporated into smartcards to provide superior functionality, then the smartcard functionality is improved, but the mechanical robustness and reliability of components during usage deteriorate
Solution Approach 1:
The patent applies preliminary action by pre-encapsulating electronic components in a separate pre-package structure before incorporating them into the smartcard. The pre-package includes a recess that cradles the component and protective layers that are already in place before the component is inserted into the smartcard body, ensuring protection is established in advance rather than requiring complex post-assembly protection.
Solution Approach 2:
The patent segments the smartcard assembly into distinct modules: a pre-package containing the electronic component, and the main smartcard body. This segmentation allows the component to be protected in its own dedicated housing (pre-package) while maintaining integration with the overall smartcard system, resolving the contradiction between functionality and robustness.
2Shape
If compensation layers are added to accommodate non-planar electronic components, then the height difference is compensated, but the number of layers increases and smartcard size requirements become difficult to meet
Solution Approach 1:
The patent merges the compensation function into the pre-package structure itself. The recess in the pre-package base layer and the protective layer together form an integrated compensation mechanism that accommodates non-planar components without requiring separate compensation layers in the main smartcard stack, thus reducing overall layer count while maintaining shape compensation.
3Ease of manufacture
If electronic components are directly incorporated into the card body, then the incorporation process is simplified, but the components become susceptible to damage during usage
Solution Approach 1:
The patent introduces the pre-package as an intermediary structure between the electronic component and the smartcard body. The pre-package with its recess and protective layer acts as a mediator that protects the component from direct exposure to harmful factors while still allowing electrical and mechanical connection to the smartcard, thus resolving the contradiction between ease of manufacture and damage susceptibility.
4Strength
If multiple layers are used to encapsulate electronic components for robustness, then mechanical protection is improved, but the external surface becomes non-planar due to shrinkage during lamination
Solution Approach 1:
The patent applies parameter changes by carefully selecting materials with appropriate thermal and mechanical properties for the pre-package layers. The materials are chosen to minimize shrinkage during the lamination process while maintaining protective strength, thus achieving both mechanical protection and surface planarity through optimized material parameters rather than increased layer count.
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 pre-package structure provides enhanced mechanical robustness and flexibility, maintaining a planar surface and meeting ISO standards, while preventing deformation during high-temperature lamination processes.
Implementation Method 1
the first material has a first VICAT softening temperature and the second material has a second VICAT softening temperature, and the third layer has a third VICAT softening temperature, wherein the third VICAT softening temperature is higher than the first VICAT softening temperature and/or than the second VICAT softening temperature
Data Source
Figure 1
Figure 2
Figure 3a~3b
AI summary
The present invention refers to a pre-package for a flexible printed circuit board for a smartcard. The pre-package comprises a flexible printed circuit board including one or more non-planar circuit portions; a first layer of a first material at least partially covering a first side of the flexible printed circuit board so as to form a planar layer; a second layer of a second material covering a second side of the flexible printed circuit board; and a third layer comprising a hardening material at least partially covering the first side so as to form a planar layer. The third layer has a third hardness value which is higher than the first hardness value and/or than the second hardness value of the first and second dielectric materials, respectively. The pre-package may be advantageously inserted into a smartcard having a suitable window for accommodating the pre¬ package comprising the electronic components. The present invention also refers to the methods for forming the pre-package and the smartcard comprising it.