USB Device Metal Shell ESD Protection Design
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Solution Overview
Problem
Conventional USB devices with non-metallic shells fail to meet electrostatic discharge (ESD) protection standards and have structural weaknesses, making them non-compliant with USB standards.
Innovation Solution
A USB device design featuring a metal shell that covers the printed circuit board and contacts, providing enhanced ESD protection and structural strength, while maintaining a compact size by using a housing with specific geometrical features to securely position the PCB and protection element.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a non-metallic shell is used, then the device can be miniaturized and manufactured with ease, but the structural strength and ESD protection are insufficient
Solution Approach 1:
The patent employs a composite structure combining a metal shell and a plastic shell. The metal shell provides structural strength and ESD protection, while the plastic shell enables miniaturization and ease of manufacture. This composite material approach resolves the contradiction by integrating the advantages of both materials in a single device structure.
2Volume of moving object
If a non-metallic shell is used, then the device can be miniaturized, but the ESD protection capability deteriorates
Solution Approach 1:
The metal shell component specifically addresses ESD protection while the plastic shell enables miniaturization. The metal shell acts as an electrostatic discharge pathway, protecting internal components from ESD damage, while the overall compact design is achieved through the plastic shell's molding capabilities.
3Stability of the object's composition
If the supporting structure location is optimized to avoid electrical elements, then the structural integrity is improved, but the design complexity increases
Solution Approach 1:
The supporting structure is segmented into multiple independent support portions that can be strategically positioned to avoid electrical elements while maintaining structural integrity. This segmentation allows the design to achieve both structural stability and low complexity by using simple, distributed support elements rather than a complex integrated structure.
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 metal shell ensures compliance with USB standards by providing effective ESD protection and improved structural integrity, preventing shifting of components and enhancing resistance to external forces.
Implementation Method 1
the non-metal material covering shell can not comply with the electrostatic discharge (ESD) testing standard specification
Implementation Method 2
The strength of the non-metal material covering shell is weaker than metal shell
Data Source
AI summary
An USB application device includes a housing having a received room therein and a front opening connected to the received room, a PCB having opposite a rear end portion completely received in the receiving room and a front end portion completely extended outside the housing from the front opening and opposite a top surface and a bottom surface, contacts disposed on the top surface of the front end portion of the PCB and exposed outside of the housing, a shell engaged with the housing and completely covers the front end portion of the PCB and the contacts, and a protection element received in the shell and covering the bottom surface of the front end portion of the PCB. The contacts are exposed outside the protection element. The shell is made of metal material for improving ESD protection in order to comply with the USB standard specification.