Connector Terminal and Metal Housing for Reduced ESD Current Peaks
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Solution Overview
Problem
Electronic devices experience failures or erroneous operations during electrostatic discharge tests due to high stray capacitance between the metal housing and the ESD gun, leading to increased current peaks that can cause breakdowns.
Innovation Solution
The electronic device incorporates a connector terminal surrounded by an electrostatic diffusion material and a metal housing with a limited flat plate area or extended projecting length to reduce stray capacitance, preventing excessive current flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the metal housing has a large flat plate area, then the device provides good shielding and structural stability, but the stray capacitance between the metal housing and ESD gun increases, causing high current peaks during electrostatic discharge tests
Solution Approach 1:
The flat plate part is segmented into multiple isolated conductive regions (first conductive region, second conductive region, third conductive region) separated by insulating grooves. This segmentation reduces the effective continuous conductive area, thereby reducing stray capacitance while maintaining shielding effectiveness through distributed grounding points.
Solution Approach 2:
Insulating grooves are introduced as intermediary elements between conductive regions. These grooves act as dielectric barriers that reduce capacitive coupling between the metal housing and external objects (ESD gun), while the housing extension parts provide alternative grounding paths that maintain shielding effectiveness.
2Object-affected harmful factors
If the connector terminal has a long projecting length, then the stray capacitance is reduced, but the device height increases
Solution Approach 1:
The solution moves from extending in the vertical dimension (longer connector terminal) to expanding in the horizontal dimension (housing extension parts with grooves). The housing extension parts create horizontal separation and insulating barriers that reduce capacitance without increasing the vertical profile of the device.
3Object-affected harmful factors
If the flat plate area is reduced to 900 cm2 or less, then the stray capacitance decreases, but the shielding effectiveness and structural stability may be compromised
Solution Approach 1:
Different regions of the housing are assigned different functions: conductive regions for shielding and grounding, insulating grooves for capacitance reduction. The housing extension parts create localized insulating structures at critical areas near the connector terminal, providing targeted capacitance reduction while maintaining overall shielding integrity through strategic conductive path design.
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 configuration effectively reduces the current peaks during electrostatic discharge tests, preventing failures and erroneous operations by minimizing stray capacitance and maintaining device integrity.
Implementation Method 1
a member that surrounds an outer periphery of the connector terminal along a direction in which the connector terminal projects, that is surrounded by an inner periphery of the flat plate part of the metal housing, and that is made of an electrostatic diffusion material
Data Source
AI summary
An electronic device includes a metal housing including a flat plate part, a connector terminal that projects from inside to outside through a through hole of the flat plate part of the metal housing and to which an electrical stress is applied, and a member that surrounds an outer periphery of the connector terminal along a direction in which the connector terminal projects, that is surrounded by an inner periphery of the flat plate part of the metal housing, and that is made of an electrostatic diffusion material.