Battery EMI Shield Tab for Noise-Free In-Ear Speakers
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Solution Overview
Problem
Wearable audio devices face noise interference from magnetic flux generated by components like the main logic board, which degrades sound quality due to limited space for effective noise reduction solutions.
Innovation Solution
An electromagnetic interference (EMI) shield tab made of high magnetic flux permeable materials like MuMetal is coupled to the battery, providing shielding and electrical connection, which can also serve as structural support and reduce noise interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If traditional EMI shielding components are added to block magnetic flux from the circuit board, then noise interference is reduced, but device complexity and space requirements increase
Solution Approach 1:
The patent combines the EMI shielding function with the battery component by integrating a shielding layer directly onto the battery surface. This merging approach eliminates the need for separate shielding components, thereby reducing device complexity while maintaining effective noise interference protection for the speaker and other sensitive components.
Solution Approach 2:
The battery is designed to serve multiple functions: energy storage and electromagnetic interference shielding. By incorporating the shielding layer into the battery structure, the same component performs both its primary energy function and the secondary shielding function, reducing the overall number of components needed in the wearable audio device.
2Object-affected harmful factors
If traditional EMI shielding components are added to block magnetic flux from the circuit board, then noise interference is reduced, but the available space within the compact device is reduced
Solution Approach 1:
The patent combines the EMI shielding function with the battery component by integrating a shielding layer directly onto the battery surface. This merging approach eliminates the need for separate shielding components, thereby reducing device complexity while maintaining effective noise interference protection for the speaker and other sensitive components.
Solution Approach 2:
The battery is designed to serve multiple functions: energy storage and electromagnetic interference shielding. By incorporating the shielding layer into the battery structure, the same component performs both its primary energy function and the secondary shielding function, reducing the overall number of components needed in the wearable audio device.
3Duration of action of moving object
If battery capacity is increased to provide sufficient power for extended wear, then battery life is improved, but battery size and weight increase
Solution Approach 1:
The patent changes the physical parameters of the battery by incorporating a lightweight shielding layer made of materials such as aluminum, copper, or ferromagnetic substances. This addition provides EMI protection while maintaining the battery's weight and size characteristics suitable for wearable applications, allowing extended battery life without proportionally increasing weight.
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 EMI shield tab effectively contains noise to levels below the hearing limit, improving audio quality in wearable audio devices while optimizing space usage within the compact device design.
Implementation Method 1
an electromagnetic interference ('EMI') shield tab coupled to the anode. The EMI shield tab may be configured to shield the speaker from EMI generated by the circuit board
Implementation Method 2
The EMI shield tab may be comprised of a high magnetic flux permeable metal material
Data Source
AI summary
A wearable audio device sized to fit within an ear of an user comprises an outer housing; a circuit board positioned within the outer housing; a battery having an anode and a cathode, the battery being connected to the circuit board; a speaker adjacent the battery; and an electromagnetic interference (“EMI”) shield tab coupled to the anode. The EMI shield tab may be configured to shield the speaker from EMI generated by the circuit board and to provide an electrical interconnection to the anode. The EMI shield tab may be comprised of a high magnetic flux permeable metal material