Selective Plating in Plastic Connectors for Stable Differential Impedance
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Solution Overview
Problem
Existing electrical connectors face challenges in maintaining consistent impedance across multiple signal conductors, especially in high-speed applications, due to variations in connector pin insertion and lack of controlled contact force, leading to inconsistent signal transmission.
Innovation Solution
A Selectively Plated Plastic Part (SPPP) with an H-shaped cross-section housing and electrically conductive plating, where the plating is applied selectively to create isolated contact regions, ensuring consistent impedance and contact force through resilient clips and standoffs, allowing for differential signal transmission with stable impedance even without connector pins.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional electrical connectors are used without selective plating, then manufacturing is simpler and cost is lower, but impedance consistency across signal conductors deteriorates
Solution Approach 1:
The patent applies selective plating to specific regions of the connector housing rather than uniform plating across the entire component. The housing includes plated contact regions where electrical contacts engage and unplated non-contact regions, creating local quality variations that ensure consistent impedance only where needed for signal transmission while maintaining manufacturing efficiency.
2Reliability
If connector pins are inserted to ensure contact force, then signal transmission is improved, but impedance consistency deteriorates due to insertion variations
Solution Approach 1:
The patent incorporates resilient clips and standoffs during the connector assembly process that pre-establish controlled contact force and positioning before signal transmission occurs. These mechanical features are built into the housing structure to ensure consistent impedance and reliable contact without requiring precise insertion of connector pins, as the preliminary mechanical arrangement guarantees proper electrical contact.
3Reliability
If uniform plating is applied to the entire housing, then electrical conductivity is improved, but signal isolation between conductors deteriorates
Solution Approach 1:
The selective plating approach applies conductive plating only to specific contact regions where electrical connections are needed, while leaving non-contact regions unplated. This local quality differentiation ensures proper electrical conductivity at contact points while maintaining signal isolation between different conductors, preventing crosstalk and interference that would occur with uniform plating across the entire housing.
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 SPPP ensures consistent differential impedance of 100±10 Ohms or 85±10 Ohms across signal conductors, maintaining signal integrity in high-speed applications like backplane or IO connectors, by providing controlled contact force and impedance through selective plating and mechanical design.
Implementation Method 1
electrical conductor plating on the first member, the electrical conductor plating comprising: at least one first section along the at least one first contact receiving channel and configured to transmit signals
Data Source
AI summary
An electrical connector including a housing and electrical conductor plating. The housing includes a first member and a second member. The first member is made of plastic and forms at least one first contact receiving channel therein. The second member is attached around the first member, and the first and second members form at least one second contact receiving channel therebetween. The electrical conductor plating is on the first member. The electrical conductor plating includes at least one first section along the at least one first contact receiving channel and at least one second section along an exterior side of the first member at the at least one second contact receiving channel. The first and second sections of the electrical conductor plating are electrically separate from one another.