Handle Assembly Grounding Mechanism for EMI Reduction
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Solution Overview
Problem
Electronic devices with conductive handle assemblies can act as antennas, radiating electromagnetic energy and causing interference with other devices due to the penetration of the handle through the chassis, leading to uncontrolled electromagnetic interference.
Innovation Solution
Incorporating a grounding mechanism that electrically connects the handle assembly to the device's ground reference when in the retracted position, forming a short loop and preventing EM radiation by grounding the handle member, thereby reducing electromagnetic interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a conductive handle assembly is used for ease of manufacture and structural integrity, then the handle assembly can be easily manufactured and provides mechanical strength, but it radiates electromagnetic energy and causes electromagnetic interference with other devices
Solution Approach 1:
A grounding mechanism is introduced as an intermediary between the conductive handle assembly and the device chassis. This grounding mechanism includes a grounding contact that engages with a grounding element on the chassis, providing a controlled path for electromagnetic energy to dissipate to ground, thereby preventing the handle from acting as an uncontrolled antenna while preserving the benefits of the conductive material
2Stability of the object's composition
If the handle assembly penetrates through the chassis for mechanical attachment, then the handle assembly can be securely attached and provide structural stability, but it creates a path for electromagnetic energy to cross from inside to outside the chassis
Solution Approach 1:
The grounding mechanism serves as an intermediary that addresses the electromagnetic issue created by the necessary chassis penetration. The grounding contact and grounding element provide a controlled electrical connection that allows the handle to maintain its structural penetration while directing electromagnetic energy along a defined path to ground, preventing uncontrolled radiation
3Strength
If the handle member is made of electrically conductive material for mechanical strength, then the handle provides structural integrity, but it effectively acts as an antenna to radiate EM energy to the outside of the chassis
Solution Approach 1:
The grounding mechanism is introduced as a mediating system between the conductive handle member and the chassis ground. The grounding contact on the handle engages with the grounding element on the chassis, creating a controlled electrical connection that allows the conductive material to maintain its structural integrity while preventing it from functioning as an uncontrolled antenna by providing a defined path for electromagnetic energy dissipation
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
Effectively minimizes electromagnetic interference by ensuring the handle assembly does not act as a single-pole antenna, maintaining device functionality while reducing EM radiation, thus enhancing operational stability and compatibility with other electronic devices.
Implementation Method 1
a grounding mechanism (114) provided at the chassis. The grounding mechanism (114) is electrically connected to the handle member (108) when the handle member (108) is in the retracted position
Implementation Method 2
the handle assembly (106) is part of a path that crosses through the chassis... the handle member (108)... can effectively act as an antenna to radiate EM energy to the outside of the electronic device chassis
Data Source
AI summary
A handle assembly is for use with an electronic device having a chassis, where at least a portion of the handle assembly is part of a path that crosses through the chassis. The handle assembly has a handle member moveable with respect to the chassis, wherein the handle member has a profile to allow for gripping by a user to move the electronic device. The handle assembly has an electrical contact to make electrical connection with the grounding mechanism of the chassis upon the handle member being moved to a first position.