USB Connector Plastic Housing with Integrated Metal Shielding
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Solution Overview
Problem
Conventional USB connectors with metal housings interfere with radio-frequency signals in mobile phones due to direct contact with the metal frame, compromising both appearance and signal integrity.
Innovation Solution
A USB connector design featuring a plastic housing with integrated metal members that avoid direct contact with the metal phone frame, utilizing a docking assembly, insulation body, conductive terminal, and waterproof glue to ensure structural strength and signal integrity, with metal members welded to the circuit board to prevent interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a metal housing is used in the USB connector, then structural strength is improved, but radio-frequency signal interference occurs
Solution Approach 1:
The USB connector is divided into separate functional components: a plastic housing for the main body, and a separate metal shielding component that is selectively positioned. This segmentation allows the metal element to provide EMI shielding only where needed (at the interface with the metal frame) without having a metal housing surrounding the entire connector, thus reducing radio-frequency interference while maintaining structural integrity through the plastic housing.
Solution Approach 2:
The metal shielding component is extracted from the traditional metal housing structure and positioned specifically at the interface between the USB connector and the metal frame. This extraction allows the metal element to be removed from areas where it would cause interference with the antenna signal, while still providing structural support and shielding where necessary.
2Object-generated harmful factors
If a plastic housing is used in the USB connector, then radio-frequency signal interference is reduced, but structural strength deteriorates
Solution Approach 1:
The USB connector employs a composite structure combining plastic and metal materials. The housing is made of plastic to avoid radio-frequency interference, while metal components (shielding plates, shielding rings, or metal caps) are strategically positioned at critical interfaces. This composite approach leverages the non-conductive properties of plastic for EMI reduction and the high strength and shielding properties of metal at specific locations, achieving both goals simultaneously.
3Shape
If the metal frame is used as an antenna, then appearance is improved and space is saved, but USB connector interference with antenna signal occurs
Solution Approach 1:
A metal shielding component acts as an intermediary element positioned between the USB connector and the metal frame antenna. This intermediary structure provides electromagnetic shielding to block interference from the metal frame while allowing the metal frame to maintain its appearance as part of the device chassis and continue functioning as an antenna without direct contact with the USB connector's electrical 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
The design effectively prevents interference with radio-frequency signals while maintaining structural strength by using a plastic housing and integrating metal members within the USB connector, ensuring reliable connectivity and waterproofing.
Implementation Method 1
a waterproof glue is applied on a tail of the docking assembly and a tail of the plastic housing, and the waterproof glue is filled in a gap between the insulation body, the plastic housing, the first metal member, and the second metal member
Implementation Method 2
The welding feet of the first metal member and the second welding portions of the second metal member are respectively configured to be welded to corresponding positions of the circuit board
Data Source
AI summary
A USB connector includes a docking assembly, a first metal member sleeved on the docking assembly, a plastic housing, and a second metal member integrated with and formed inside the plastic housing. The docking assembly includes an insulation body including a base and a docking tongue extending forward from the base and a conductive terminal integrated with and formed inside the insulation body. The first metal member includes an annular body sleeved on the base and welding feet extending rearward from two opposite sides of the annular body. The second metal member includes a plate body formed on a side wall of the plastic housing. Second welding portions formed by two sides of the plate body are bent and then extend toward the circuit board and a holding piece extending rearward from the plate body and fastened at a tail of the base of the insulation body.