Speaker Frame Magnetic Shielding for Battery EMI Noise
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Solution Overview
Problem
In miniaturized wearable electronic devices, components such as speakers and batteries are closely positioned, leading to electromagnetic interference that causes unintended noise in the speaker due to electromagnetic waves generated by the battery.
Innovation Solution
The electronic device incorporates a housing with frames having a magnetic permeability to vacuum permeability ratio of at least 1000, featuring frame holes, to minimize interference from battery-generated electromagnetic waves.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the speaker and battery are disposed very close to each other to achieve miniaturization, then the device size is reduced, but electromagnetic waves generated from the battery cause unintended noise in the speaker
Solution Approach 1:
A magnetic shield is introduced as an intermediary component between the battery and the speaker. This magnetic shield acts as a mediator that blocks electromagnetic waves generated by the battery from reaching the speaker, thereby preventing unintended noise while allowing the components to remain in close proximity for miniaturization
Solution Approach 2:
The invention converts the harmful electromagnetic waves generated by the battery into a beneficial configuration by using a magnetic shield to redirect and contain these waves. The shield transforms the potentially harmful electromagnetic radiation into a controlled magnetic field that does not interfere with the speaker operation
2Object-affected harmful factors
If frames with high magnetic permeability are used to reduce electromagnetic interference, then noise in the speaker is reduced, but the device complexity increases
Solution Approach 1:
The magnetic shield is designed to perform multiple functions simultaneously: it acts as both an electromagnetic interference barrier and a structural support element for the speaker assembly. This multi-functionality reduces the need for additional separate components, thereby limiting the increase in device complexity while still achieving noise reduction
Solution Approach 2:
The invention changes the magnetic permeability parameter of the shield material to at least 1000 times that of vacuum, which significantly enhances the shielding effectiveness. This parameter change allows for a thinner and more integrated shield design, reducing the overall structural complexity while maintaining effective noise reduction
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
This design significantly reduces unintended noise in the speaker, ensuring better performance and functionality in compact wearable devices.
Implementation Method 1
a ratio μ/μ0 of a magnetic permeability to a vacuum permeability of at least one of a material of the first frame or a material of the second frame may be equal to or greater than 1000
Data Source
AI summary
An electronic device may include a housing, a first frame disposed inside the housing and including a first surface, a second frame forming an internal space by being coupled with the first frame, and including a second surface opposed to the first surface, a speaker disposed in the internal space and including at least one voice coil, and a battery disposed on a side of the second frame. The second frame may include at least one frame hole, and a ratio μ/μ0 of a magnetic permeability to a vacuum permeability of at least one of a material of the first frame or a material of the second frame may be equal to or greater than 1000.