Speaker Module Magnetic Shielding for Slim Electronic Devices
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Solution Overview
Problem
In electronic devices, the mounting of speaker devices in limited spaces restricts acoustic performance due to magnetic field leakage, which affects neighboring components and increases device thickness, making it difficult to achieve both improved sound quality and a slim design.
Innovation Solution
Incorporating a ferromagnetic material between the speaker module's yoke and enclosure to enhance magnetic field concentration and reduce the impact of magnetic leakage, while using part of the acoustic duct as a sound absorbing material to minimize thickness and improve resonance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a magnetic material is applied to the front face of the speaker module for shielding, then magnetic field leakage is reduced, but acoustic performance is degraded
Solution Approach 1:
The patent applies magnetic shielding material specifically to the rear face of the speaker module where magnetic leakage occurs, rather than the front face. This localized application shields magnetic components from affecting neighboring electronic components while preserving the acoustic performance by not placing material in the sound path.
Solution Approach 2:
The patent introduces a magnetic shielding plate as an intermediary component positioned between the speaker module and neighboring electronic components. This plate acts as a mediator that blocks magnetic field lines from reaching sensitive components, resolving the conflict between magnetic shielding and acoustic performance.
2Reliability
If the thickness or size of the speaker module is increased to improve acoustic performance, then acoustic performance is improved, but device thickness increases
Solution Approach 1:
The patent shifts the magnetic shielding function from the front face (sound-emitting dimension) to the rear face of the speaker module. This dimensional relocation allows shielding to occur in a different spatial plane, preventing interference with sound propagation while achieving magnetic field containment within the same device thickness envelope.
Solution Approach 2:
The patent extracts the magnetic shielding function from the main speaker module structure and implements it as a separate shielding plate on the rear face. This extraction allows the speaker module itself to maintain its optimized acoustic dimensions while the shielding function is fulfilled by an additional component that does not interfere with sound emission.
3Ease of operation
If subsidiary materials such as poron are used to secure ventilation through the rear face, then ventilation is secured, but device thickness increases
Solution Approach 1:
The patent designs the rear face structure to simultaneously fulfill multiple functions: the magnetic shielding plate also serves as the ventilation cover, eliminating the need for separate poron materials. The shielding plate includes ventilation holes that provide air flow paths, combining magnetic shielding and ventilation functions in a single component at the same thickness level.
Solution Approach 2:
The patent merges the magnetic shielding function and ventilation function into a single integrated rear face structure. The shielding plate with built-in ventilation holes combines what were previously separate components (shielding material and ventilation material), reducing overall device thickness by eliminating redundant layers.
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 solution increases sound volume, reduces the thickness of the speaker mounting structure, minimizes the influence of magnetic forces on neighboring components, and facilitates a slimmer electronic device design with enhanced acoustic performance.
Implementation Method 1
a ferromagnetic material disposed between the first plate and the yoke
Implementation Method 2
it may be necessary to dispose a material capable of shielding magnetism to a front or rear face of the speaker module to block leakage of magnetic flux
Implementation Method 3
an acoustic duct constructed between the enclosure and the second plate and extending towards the at least one speaker hole
Implementation Method 4
using part of the acoustic duct as a sound absorbing material
Data Source
AI summary
An electronic device is provided. The electronic device includes a housing including a first plate disposed to face a first direction, a second plate disposed to face a second direction opposite to the first direction, and a side member enclosing at least part of a space between the first and second plates and having at least one speaker hole constructed thereon, and a speaker device disposed between the first and second plates to emit a sound through the speaker hole. The speaker device may include: a speaker unit including a yoke disposed to a first face facing the first direction and a diaphragm disposed to a second face facing the second direction, wherein the diaphragm is disposed to face the second direction, and is disposed to face at least part of the second plate, an enclosure shaped to enclose at least part of the speaker unit and disposed between the first and second plates, an acoustic duct constructed between the enclosure and the second plate and extending towards the at least one speaker hole, and a ferromagnetic material disposed between the first plate and the yoke.