Card Reader Flexible Circuit Board Security Design
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Solution Overview
Problem
Existing card readers with multilayer flexible printed circuit boards increase cost and thickness, reducing flexibility and making it difficult to prevent malicious data acquisition, as the disconnection detection signal layer covers the data signal layer from both sides.
Innovation Solution
A card reader design with a flexible printed circuit board where the destruction detection circuit layer is formed on one side of the data signal circuit layer, allowing the data signal circuit to be exposed on the main body frame in unprotected areas and protected by a protection board, enhancing flexibility and reducing thickness while maintaining security.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the disconnection detection signal layer is arranged on both sides of the data signal layer in the thickness direction of the flexible printed circuit board, then malicious data acquisition from the data signal circuit can be avoided, but the cost and thickness of the flexible printed circuit board increase
Solution Approach 1:
The patent extracts the disconnection detection signal layer from both-sided arrangement and repositions it to only one side (the outer side) of the flexible printed circuit board. This extraction of the detection layer from the symmetric dual-sided configuration reduces the overall thickness and layer count while maintaining the security function through alternative positioning strategies.
Solution Approach 2:
The patent transitions from a thickness-direction stacking approach (multiple layers in Z-axis) to a planar arrangement approach (X-Y plane positioning). By arranging the destruction detection circuit layer to overlap the data signal circuit layer in the planar view and positioning it on the outer side, the design achieves security detection without increasing thickness directionally.
2Reliability
If the disconnection detection signal layer is arranged on both sides of the data signal layer in the thickness direction of the flexible printed circuit board, then malicious data acquisition from the data signal circuit can be avoided, but the cost of the flexible printed circuit board increases
Solution Approach 1:
The patent extracts the disconnection detection signal layer from both-sided arrangement and repositions it to only one side (the outer side) of the flexible printed circuit board. This extraction of the detection layer from the symmetric dual-sided configuration reduces the overall thickness and layer count while maintaining the security function through alternative positioning strategies.
Solution Approach 2:
The patent changes the structural parameters of the flexible printed circuit board by reducing the number of layers from a multilayer symmetric structure to a simplified structure with the destruction detection circuit layer positioned on one side only. This parameter change in layer configuration directly reduces manufacturing complexity and cost.
3Reliability
If the thickness of the flexible printed circuit board increases, then the disconnection detection signal layer can be arranged on both sides for security, but the flexibility of the flexible printed circuit board decreases
Solution Approach 1:
The patent extracts the disconnection detection signal layer from both-sided arrangement and repositions it to only one side (the outer side) of the flexible printed circuit board. This extraction of the detection layer from the symmetric dual-sided configuration reduces the overall thickness and layer count while maintaining the security function through alternative positioning strategies.
4Reliability
If the thickness of the flexible printed circuit board increases, then the disconnection detection signal layer can be arranged on both sides for security, but the followability of the magnetic head to the card is lowered
Solution Approach 1:
The patent extracts the disconnection detection signal layer from both-sided arrangement and repositions it to only one side (the outer side) of the flexible printed circuit board. This extraction of the detection layer from the symmetric dual-sided configuration reduces the overall thickness and layer count while maintaining the security function through alternative positioning strategies.
Data Source
AI summary
A card reader may include a main body frame; a flexible printed circuit board; and a protection board to protect a part of the flexible printed circuit board. The flexible printed circuit board may include a data signal circuit layer having a data signal circuit for transferring data, and a destruction detection circuit layer having a destruction detection circuit. The destruction detection circuit layer may overlap the data signal circuit layer. A second destruction detection circuit may be provided on the protection board. The destruction detection circuit layer is provided on one side of the data signal circuit layer. Part of the flexible printed circuit board may be covered with the protection board. The data signal circuit layer may be arranged on the main body frame side at least in the unprotected area and the destruction detection circuit layer may be arranged on an outer side of the card reader.