PCB Breakage Detection Pattern Shielded by Ground and Power Layers
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Solution Overview
Problem
Conventional safety cases with spiral-shaped wiring patterns for breakage detection are prone to erroneous disconnection due to high impedance and external noise interference, leading to potential data leakage.
Innovation Solution
A printed circuit board with a breakage detection pattern layer shielded by ground and power supply patterns from both sides, preventing external noise interference and ensuring accurate detection of disconnection and short circuits, while being designed to be invisible from the outer side to deter unauthorized access.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a spiral-shaped wiring pattern is used for breakage detection, then the detection line covers the entire region of the base member, but the impedance becomes high and the wiring pattern is easily affected by external noise
Solution Approach 1:
The patent divides the breakage detection pattern into multiple independent linear segments arranged in parallel between the first and second pattern layers. Each segment consists of a detection line with ground lines on both sides, rather than using a single continuous spiral pattern. This segmentation reduces the total length of the detection line while maintaining coverage, thereby lowering impedance and reducing susceptibility to external noise.
Solution Approach 2:
The patent transitions from a two-dimensional spiral pattern on a single layer to a three-dimensional structure where multiple linear detection segments are distributed between the first pattern layer and the second pattern layer. This dimensional change allows the detection pattern to span the thickness direction of the printed circuit board, providing both coverage and reduced impedance through the parallel arrangement of multiple short segments.
2Ease of operation
If the breakage detection pattern is made visible or accessible from the outer side, then access for detection is easier, but unauthorized access and data leakage become more likely
Solution Approach 1:
The breakage detection pattern is nested between the first pattern layer and the second pattern layer, which are themselves embedded within the printed circuit board structure. The detection pattern is not directly accessible from the outer side but is instead positioned within the internal layers, requiring passage through multiple protective layers to reach. This nested arrangement maintains detection functionality while preventing unauthorized access.
Solution Approach 2:
The first pattern layer and the second pattern layer act as intermediary protective structures between the external environment and the breakage detection pattern. These layers serve as mediators that allow the detection pattern to function internally while being shielded from direct external access, thus preventing unauthorized interaction with the detection system.
Data Source
AI summary
Provided is a printed circuit board having a breakdown detection pattern formed thereon for preventing illicit acquisition of sensitive data, the printed circuit board being configured so that false detection of a disconnection or a short in the breakdown detection pattern can be prevented. The printed circuit board comprises a breakdown detection pattern layer wherein a breakdown detection pattern is formed for detecting a disconnection and/or a shorting thereof, a first pattern layer disposed more to a Y1 direction side than the breakdown detection pattern layer, a second pattern layer disposed more to a Y2 direction side than the breakdown detection pattern layer, and signal pattern layers disposed more to the Y2 direction side than the second pattern layer. Formed in the first pattern layer are a grounding pattern and a power source pattern covering the breakdown detection pattern from the Y1 direction side. Formed in the second pattern layer are a grounding pattern and a power source pattern covering the breakdown detection pattern from the Y2 direction side.