Drop-Down Connector Push Bar for Low-Crosstalk Card Contacts

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Solution Overview

Problem

Designing connectors for high data rate applications that maintain mechanical and electrical integrity is challenging, particularly due to issues with signal integrity and crosstalk, especially with longer contact tips in connectors.

Innovation Solution

Incorporating a push bar mechanism that maintains a minimal distance between opposing contact tips of terminal conductors using a biasing component, even when no paddle card is inserted, to improve signal integrity and reduce stub length.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If contact tip length is increased to ensure reliable contact, then contact reliability is improved, but signal integrity deteriorates due to increased stub length and crosstalk

Engineering Contradiction:

Improvecontact reliabilityVSAvoidsignal integrity

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The contact tips are designed to be movable rather than fixed, allowing them to dynamically adjust their position. A spring mechanism applies continuous force to push the contact tips against the mating connector, ensuring reliable contact while maintaining minimal stub length when no connector is present, thus preserving signal integrity

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The contact tips utilize elastic deformation of the contact member itself to provide the necessary contact force. The spring element within the contact member automatically adjusts the contact pressure, eliminating the need for additional complex positioning mechanisms while maintaining both reliability and signal integrity

Inventive Principle:

Principle #25Self-service

2Volume of moving object

If contact tips are positioned closer together to reduce connector size, then device compactness is improved, but crosstalk between adjacent signal pairs increases

Engineering Contradiction:

Improveconnector sizeVSAvoidcrosstalk

Core Design Contradiction:

Volume of moving objectVSObject-generated harmful factors

Solution Approach 1:

Ground terminals are strategically positioned between adjacent signal contact tips to create electrical shielding partitions. This segmentation of the connector into isolated zones reduces electromagnetic coupling between adjacent signal pairs, allowing tighter spacing while maintaining low crosstalk levels

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Ground terminals serve as intermediary shielding elements between signal conductors. These ground terminals create return paths and electromagnetic shields that isolate adjacent signal pairs, enabling compact connector design without sacrificing signal integrity

Inventive Principle:

Principle #24Intermediary (Mediator)

3Stability of the object's composition

If wafer assembly structure is used to maintain mechanical requirements, then mechanical stability is improved, but manufacturing complexity increases

Engineering Contradiction:

Improvemechanical stabilityVSAvoidassembly complexity

Core Design Contradiction:

Stability of the object's compositionVSDevice complexity

Solution Approach 1:

Multiple functions are integrated into the contact member itself: the contact tip provides electrical connection, the spring element provides contact force, and the overall structure provides positioning. This merging of functions into a single component reduces assembly complexity while maintaining mechanical stability

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The contact member is designed as a multi-functional component that simultaneously provides electrical conduction, mechanical spring force, and positional alignment. This universal design eliminates the need for separate components for each function, simplifying the overall assembly process

Inventive Principle:

Principle #6Universality (Multi-functionality)

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 push bar mechanism enhances signal integrity by maintaining a predetermined clearance between contact tips, reducing insertion loss and crosstalk, and improving electrical performance in high data rate applications.

Implementation Method 1

a biasing component pushes the push bar toward the front port opening of the housing and into contact with the rows of terminal conductors

Methodology Applied

Scientific EffectElasticity: Elasticity

Data Source

PatentUS20250385455A1Drop down contact connector

Publication Date: 2025.12.18 MOLEX INC

AI summary

Aspects of drop down contacts in connectors are described. An example connector includes a housing with a front port opening, a wafer assembly including terminal rows, a push bar, and a biasing component. The push bar is positioned in the housing and extends between the terminal rows. The biasing component pushes the push bar toward the front port opening of the housing and into contact with the rows of terminal conductors. The push bar maintains a minimal distance or clearance between opposing contact tips of the rows of terminal conductors even when no paddle card is inserted into the connector. When a paddle card is inserted into the front port opening, the paddle card pushes the push bar out of contact with the terminal conductors, so that the terminal conductors drop down upon contact surfaces of the paddle card.