Battery Seal With Magnetic Shielding for Hearing Aid Compatibility
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Solution Overview
Problem
Magnetic interference from mobile communication device batteries, particularly due to current draw during GSM radio transmission, interferes with hearing aids and other electronic devices, violating hearing aid compatibility standards by reducing the signal-to-noise ratio.
Innovation Solution
Integration of a magnetic shield portion within the battery's sealing portion, utilizing high magnetic permeability materials like Mu Metal, to redirect magnetic flux away from the receiver, thereby minimizing interference with nearby electronic devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a battery provides power to the radio during GSM transmission, then electrical power is supplied to enable communication, but magnetic interference is generated that reduces signal-to-noise ratio and interferes with hearing aids
Solution Approach 1:
A magnetic shield portion made of high magnetic permeability material (such as Mu Metal) is introduced as an intermediary between the battery and the receiver/hearing aid. This shield redirects magnetic flux through itself, preventing the magnetic field from reaching the hearing aid coil and thereby eliminating the harmful magnetic interference while allowing the battery to continue providing electrical power normally
Solution Approach 2:
The magnetic shield portion is integrated into the sealing portion of the battery, effectively extracting and isolating the magnetic flux generated by the battery. By routing the magnetic flux through the shield material, the harmful magnetic field is separated from the receiver area, allowing the battery to maintain its power supply function without causing interference
2Reliability
If current is increased in the mobile communication device receiver to meet signal-to-noise ratio requirements, then hearing aid compatibility is improved, but magnetic interference and power consumption increase
Solution Approach 1:
The invention converts the harmful magnetic field generated by the battery into a beneficial effect by using the high magnetic permeability shield material to redirect the flux. The shield captures the magnetic flux that would otherwise interfere with the hearing aid and channels it through the shield structure, effectively transforming the harmful magnetic interference into a controlled magnetic pathway that protects the receiver area
3Object-affected harmful factors
If a magnetic shield portion is added to the battery to reduce magnetic interference, then hearing aid compatibility is improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The magnetic shield portion is merged with the sealing portion of the battery, combining two functional elements into a single integrated structure. The sealing portion, which already exists to protect the battery interior, is enhanced by incorporating the magnetic shield functionality, thereby reducing overall device complexity compared to adding a separate magnetic shield component
Solution Approach 2:
The sealing portion of the battery is given multiple functions: it continues to provide its original sealing and protective function while simultaneously serving as a magnetic shield to redirect magnetic flux. This multi-functionality eliminates the need for additional dedicated magnetic shield components, simplifying the overall battery 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
Significantly reduces magnetic noise by more than 10 dB compared to prior art, ensuring compliance with hearing aid compatibility standards and minimizing interference with hearing aids and other devices.
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
Implementation Method 2
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
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.