Full-Shielding Cable Connector EMI Resistance

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Solution Overview

Problem

Conventional methods for improving electromagnetic interference (EMI) resistance in flexible flat cables or flexible print circuits are either costly due to additional grounding processes or prone to incorrect installation due to parallel insertion onto circuit boards, lacking effective full-shielding solutions.

Innovation Solution

A full-shielding cable connector design that includes an insulated body, metal frame, shielding conductive body, and pull rod, allowing for electrical connection to a circuit board with the shielding layers of the cable, eliminating the need for extra grounding and simplifying the installation process by ensuring proper alignment.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If a metal foil is adhered to an outer surface of a cable shielding layer with additional grounding process, then electromagnetic interference (EMI) resistance is improved, but manufacturing cost and time increase

Engineering Contradiction:

ImproveEMI resistanceVSAvoidgrounding process cost

Core Design Contradiction:

Object-affected harmful factorsVSEase of manufacture

Solution Approach 1:

The patent merges the shielding layer and grounding layer into a single integrated structure. The cable connector includes a shielding layer with a grounding circuit formed as an integral part of the shielding layer, eliminating the need for separate grounding processes. This integration maintains EMI protection while reducing manufacturing complexity and cost.

Inventive Principle:

Principle #5Merging (Combining)

2Object-affected harmful factors

If a metal foil is adhered to an outer surface of a cable shielding layer, then electromagnetic interference (EMI) resistance is improved, but grounding reliability deteriorates due to lack of common ground

Engineering Contradiction:

ImproveEMI resistanceVSAvoidgrounding reliability

Core Design Contradiction:

Object-affected harmful factorsVSReliability

Solution Approach 1:

The shielding layer and grounding circuit are merged into a single conductive structure with a unified ground connection. The grounding circuit is formed as an integral part of the shielding layer, ensuring that both the shielding function and grounding function share a common reference potential, thereby improving grounding reliability and EMI protection effectiveness.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The cable connector acts as an intermediary component that provides a common ground connection between the shielding layer and the circuit board. The grounding circuit in the cable connector establishes a reliable reference potential that connects both sides of the shielding layer to ground, ensuring consistent grounding across the entire assembly.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Area of stationary object

If the cable is installed parallel to the circuit board, then space is saved, but installation difficulty increases and insertion angle deviation occurs

Engineering Contradiction:

Improvespace utilizationVSAvoidinstallation ease

Core Design Contradiction:

Area of stationary objectVSEase of operation

Solution Approach 1:

The patent changes the installation orientation from parallel (2D plane) to perpendicular (3D space). The cable connector is designed to receive the cable in a direction perpendicular to the circuit board surface, utilizing the vertical dimension. This dimensional change simplifies installation by providing clear alignment references and preventing insertion angle deviations while maintaining compact space utilization.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

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 solution provides effective EMI resistance without additional grounding costs and ensures correct cable installation by physically contacting the shielding layers of the cable with the connector, enhancing electrical connection and shielding efficacy.

Implementation Method 1

when the pull rod is rotated to a fastened position, the pull rod is fastened to the insulated body

Methodology Applied

Scientific EffectFriction: Friction

Implementation Method 2

the pull rod is rotatably connected to the shielding conductive body, and when the pull rod is rotated to a fastened position, the pull rod is fastened to the insulated body

Methodology Applied

Scientific EffectMechanical Force: Mechanical Force

Implementation Method 3

an upper shielding layer and a lower shielding layer of the cable are electrically connected to the shielding conductive body

Methodology Applied

Scientific EffectElectrical Conduction: Conduction (electrical)

Data Source

PatentUS11177598B2Full-shielding cable connector and cable plug thereof

Publication Date: 2021.11.16 BELLWETHER ELECTRONIC CORP

AI summary

A full-shielding cable connector includes an insulated body, a metal frame, a shielding conductive body, and a pull rod. The insulated body has a plurality of terminal slots for receiving a plurality of terminals, respectively. The metal frame is fixed to the insulated body. The metal frame has pins that are electrically connected to a grounding circuit of a circuit board. The shielding conductive body is detachably assembled to the insulated body and arranged above the metal frame. The shielding conductive body has a cable receiving chamber for receiving a cable, and contacts a top and bottom surface of the cable. The pull rod is rotatable with respect to the shielding conductive body. The pull rod can be rotated to a front end of the insulated body to be fastened thereto.