Magnetic Shield Structure for Speaker Heat Management in Electronic Devices
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Solution Overview
Problem
Existing electronic devices face challenges in managing heat generated by speakers, which can lead to reduced sound quality and potential damage due to magnetic interference, especially when the speaker coil faces the display.
Innovation Solution
A magnetic shield structure is implemented in the electronic device to shield the magnetism of the speaker coil, allowing heat to be directed towards the display and away from the rear cover, thus preventing hot spots and magnetic interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the speaker coil is disposed facing the rear cover, then heat can be transferred directly to the rear cover, but a hot spot occurs at the magnet position causing potential damage
Solution Approach 1:
A magnetic shield plate is introduced as an intermediary component between the speaker coil and the rear cover. This plate serves dual functions: it shields the magnetic field from interfering with the rear cover components while also acting as a heat dissipation path. The magnetic shield plate distributes the heat over a larger area, preventing hot spot concentration at the magnet position while maintaining efficient heat transfer to the rear cover.
Solution Approach 2:
The magnetic shield plate is made of a composite material structure that combines magnetic shielding properties with thermal conduction properties. This allows the plate to simultaneously block magnetic field interference and conduct heat away from the speaker coil, resolving the contradiction between heat transfer efficiency and hot spot prevention.
2Object-affected harmful factors
If the speaker coil is disposed facing the display, then hot spot formation in the rear cover is reduced, but magnetic field interferes with the display and internal components
Solution Approach 1:
The magnetic shield plate serves as a mediator that allows the speaker coil to face the display (improving heat distribution) while simultaneously blocking the magnetic field from interfering with the display and internal components. The plate is positioned to intercept magnetic field lines and redirect them, preventing interference with sensitive components.
Solution Approach 2:
The magnetic shield plate is segmented into different regions with varying thickness or material properties to optimize both magnetic shielding and heat dissipation functions. Different segments may have different magnetic permeability or thermal conductivity to address local requirements in the speaker assembly.
3Temperature
If excessive heat is generated in the speaker, then current intensity must be reduced, but this limits sound output and audio quality
Solution Approach 1:
The magnetic shield plate acts as a thermal intermediary that provides an additional heat dissipation pathway. By conducting heat away from the speaker coil and magnet assembly, the plate allows higher current intensity to be sustained without excessive temperature rise, thereby maintaining sound output quality while managing heat generation.
Solution Approach 2:
The magnetic shield plate extends the heat dissipation into a new spatial dimension by providing a lateral heat conduction path to the rear cover, rather than relying solely on vertical heat transfer through the magnet assembly. This dimensional extension of heat dissipation enables better thermal management.
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 magnetic shield structure effectively reduces heat buildup in the rear cover, maintains sound quality by minimizing frequency adjustments, and prevents magnetic interference with the device's components, including the display.
Implementation Method 1
a magnetic shield structure which surrounds the speaker coil in a direction toward the display
Implementation Method 2
allowing heat to be directed towards the display and away from the rear cover
Implementation Method 3
Due to the intensity of the current applied to the speaker, the coil may generate heat
Implementation Method 4
When an alternating current is applied to the coil, the coil becomes an electromagnet and the N and S poles change according to the electrical signal
Data Source
Figure 1~2
Figure 3
Figure 4
AI summary
Provided is an electronic device. The electronic device may include: a housing including a front plate, a rear plate facing away from the front plate, and a side member surrounding a first space between the front plate and the rear plate; a display panel exposed to an exterior of the electronic device through the front plate and configured to detect a pen input using a magnetic field; a speaker structure disposed between the display panel and the rear plate, and including a first surface facing the display panel, a second surface facing in a direction opposite the display panel, a side surface surrounding a second space between the first surface and the second surface, and a yoke facing the first surface; and a first shield structure made of a ferromagnetic material and disposed on the first surface.