Movable Front Housing Connector Impedance Control
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Solution Overview
Problem
Electrical connector assemblies in complex systems often experience impedance discontinuities due to air gaps at the mating interface, especially when partially mated, leading to signal degradation and quality issues at high transmission speeds.
Innovation Solution
The electrical connector assembly includes a module stack, a front housing, and a spring member, where the front housing is movable between retracted and extended positions, biased by the spring member to ensure contact and eliminate air gaps at the mating interface, maintaining impedance control regardless of full or partial mating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If connector assemblies are allowed to partially mate due to manufacturing tolerances and bowed circuit boards, then assembly ease and adaptability are improved, but impedance discontinuity and signal quality deteriorate
Solution Approach 1:
The front housing is made movable relative to the module stack through a spring mechanism, allowing it to dynamically adjust its position. The spring member enables the front housing to extend forward to eliminate air gaps when circuit boards are bowed or have manufacturing variations, while still maintaining contact force for reliable electrical connection. This dynamic adjustment resolves the contradiction by adapting to different mating conditions without compromising impedance control.
2Reliability
If the front housing is made movable to eliminate air gaps, then impedance control is improved, but device complexity increases
Solution Approach 1:
The spring member is configured to automatically extend the front housing forward when the connector assembly is inserted, eliminating the need for external actuation mechanisms. The spring self-regulates the position of the front housing based on the mating conditions, providing impedance control through a simple, self-actuating mechanism rather than complex controlled systems.
3Reliability
If the spring member biases the front housing towards the extended position, then air gap elimination is improved, but manufacturing precision requirements increase
Solution Approach 1:
The spring member's force characteristics are optimized to provide sufficient biasing force to extend the front housing and eliminate air gaps under normal operating conditions. By carefully selecting spring parameters (coil rate, pre-load, wire diameter), the design achieves reliable air gap elimination without requiring extremely tight manufacturing tolerances on other components.
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 significantly reduces or eliminates air gaps at the mating interface, enhancing signal transmission performance and maintaining impedance control across the interface, even at high speeds, thereby improving overall electrical performance.
Implementation Method 1
The spring member engages the module stack and the front housing and biases the front housing towards the extended position
Data Source
AI summary
An electrical connector assembly includes a module stack, a front housing, and a spring member. The module stack includes multiple contact modules disposed side by side. The module stack includes multiple signal contacts that project beyond a front side thereof. The front housing is mechanically coupled to the module stack at the front side and surrounds the signal contacts. The front housing defines cavities that receive mating contacts of a mating connector to engage the signal contacts. The front housing is movable relative to the module stack along a longitudinal axis of the electrical connector assembly between a retracted position and an extended position. The spring member is held between the module stack and the front housing. The spring member engages the module stack and the front housing to bias the front housing towards the extended position.