Magnetically Shielded Battery Sealing for Receiver Interference
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Solution Overview
Problem
Magnetic interference from mobile communication device batteries, particularly due to current draw during GSM radio transmission, poses challenges in maintaining the signal-to-noise ratio required for hearing aid compatibility and minimizing interference with other electronic devices.
Innovation Solution
Incorporating a magnetic shield portion with high magnetic permeability materials, such as Mu Metal, into the battery's sealing can or soft sealing case to redirect magnetic flux away from the receiver, thereby reducing magnetic interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a traditional battery design is used, then the battery provides electrical power to the radio, but magnetic interference is generated that degrades hearing aid compatibility and interferes with other electronic devices
Solution Approach 1:
A magnetic shield portion made of high magnetic permeability material is introduced as an intermediary between the battery portion and the receiver. This shield redirects magnetic flux away from the receiver, reducing magnetic interference to hearing aids and other electronic devices while maintaining electrical power delivery functionality
Solution Approach 2:
The magnetic shield is strategically positioned on the receiver side of the battery, creating a localized magnetic field redistribution zone. This targeted approach reduces magnetic interference in the critical receiver area without affecting the overall battery performance or requiring complete redesign of the battery structure
2Object-affected harmful factors
If a magnetic shield portion is added to the battery, then magnetic interference is reduced, but the device complexity increases
Solution Approach 1:
The magnetic shield portion is integrated into the sealing can or soft sealing case structure, allowing it to serve dual purposes: providing magnetic shielding functionality while simultaneously maintaining the structural integrity and sealing properties of the battery. This multi-functionality approach reduces overall device complexity
Solution Approach 2:
The magnetic shield is merged with existing battery components (sealing can or soft sealing case) rather than being added as a separate independent element. This integration reduces the number of discrete parts and simplifies the overall battery structure while achieving the desired magnetic interference reduction
3Measurement precision
If current is increased in the mobile communication device receiver, then the signal-to-noise ratio improves, but magnetic interference increases
Solution Approach 1:
The magnetic shield converts the harmful magnetic flux generated by the battery into a beneficial redirection pattern. By providing a high permeability path, the shield captures and redirects magnetic flux away from the receiver, allowing the receiver to operate at optimal current levels without generating excessive magnetic interference
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 approach significantly reduces magnetic noise by at least 10 dB compared to prior art, minimizing interference with hearing aids and other devices while providing structural stability to the battery.
Implementation Method 1
a magnetic shield portion arranged relative to the battery portion such that magnetic flux from the battery portion is routed away from the receiver
Data Source
AI summary
A low magnetic interference battery is provided, the battery insertable into a mobile communication device, the mobile communication device comprising a radio interconnected with a microphone and a receiver. The battery comprises a battery portion enabled to provide electrical power to the radio, the battery portion emitting a magnetic field when in operation. The battery further comprises a sealing portion for sealing the battery portion therein such that the battery portion is protected from moisture, the sealing portion comprising a magnetic shield portion arranged relative to the battery portion such that magnetic flux from the battery portion is routed away from the receiver when the battery is in operation in the mobile communication device.