Capacitive Shielding for Electrical Connection Defect Detection
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Solution Overview
Problem
Conventional electrical connection defect detection devices face issues with undesired capacitance due to the close proximity of the probe and electrode board, leading to inaccurate test results when signal lines are placed on the same side of the circuit board as the electrode board.
Innovation Solution
The proposed electrical connection defect detection device incorporates an electrode board with an array of through holes or an electromagnetic shielding object connected to ground potential, which performs capacitive shielding to maintain a safe distance from the under-test pin and prevent unwanted capacitance, ensuring accurate detection of electrical connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the probe tests the signal lines on the same side of the circuit board as the electrode board, then the test procedure is simplified and productivity is improved, but undesired capacitance is generated between the probe and electrode board affecting measurement precision
Solution Approach 1:
The patent introduces an electromagnetic shielding object as an intermediary between the probe and the electrode board. This shielding object, positioned on the electrode board, acts as a mediator to block the unwanted capacitive coupling between the probe and electrode board while allowing the detection of the intended capacitance between the electrode board and the under-test pin. This resolves the contradiction by enabling same-side testing without the harmful capacitive interference.
Solution Approach 2:
The patent applies local quality by creating a differentiated electrical environment: the region between the probe and electrode board is shielded to prevent unwanted capacitance, while the detection path from the electrode board to the under-test pin remains open for measurement. The shielding object is strategically positioned to affect only the specific unwanted capacitive coupling while leaving the useful measurement path intact.
2Device complexity
If the probe is placed closer to the electrode board for same-side testing, then device complexity is reduced, but harmful capacitive coupling is generated between the probe and electrode board
Solution Approach 1:
The electromagnetic shielding object serves as a protective intermediary that allows the probe to be positioned close to the electrode board without creating harmful capacitive coupling. The shielding object is electrically connected to ground potential and physically positioned between the probe and electrode board to block the unwanted electromagnetic field interaction, thus enabling simplified same-side testing while eliminating the harmful effect.
Solution Approach 2:
The patent converts the potentially harmful close proximity of the probe to the electrode board into a beneficial arrangement by introducing the shielding object. The close positioning enables simplified testing geometry and reduced device complexity, while the shielding object transforms what would be harmful capacitive coupling into a controlled environment where only the desired capacitance (between electrode board and under-test pin) is measured.
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
This solution effectively reduces undesired capacitance, allowing for precise detection of electrical connections by maintaining a threshold capacitance value, thereby improving the accuracy of defect detection in modern electronic devices.
Implementation Method 1
The array of through holes are placed along the edges of the electrode board and electrically connected to a ground potential to perform a capacitive shielding when the signal provider and the electrode board are on the same side of the circuit board
Data Source
AI summary
An electrical connection defect detection device to detect whether an electrical connection between an under-test pin of an under-test device and a signal line of a circuit board is normal is provided. The electrical connection defect detection device comprises a signal provider providing a test signal to the under-test pin through the signal line, a detection module and an electrode board comprising a detection surface and at least one array of through holes. The detection surface contacts a surface of the under-test device to make the detection module detect a capacitance value associated with the electrode board, the under-test pin and the signal line larger than a threshold value when their connection is normal. The through holes are placed along the edges of the electronic board and are electrically connected to a ground potential to perform a capacitive shielding.