Micro Speaker Thermal Bridge for Heat Dissipation
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Solution Overview
Problem
Micro speaker assemblies in portable consumer electronics face thermal dissipation challenges due to heat buildup, which can damage components and lead to demagnetization of the magnet unit, especially in constrained spaces where heat escape is difficult.
Innovation Solution
A micro speaker assembly design featuring two drivers with their magnetic systems thermally connected via a thermally conductive bridge, allowing heat transfer between the high-frequency and low-frequency drivers, with the low-frequency driver acting as a heat sink to manage thermal dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the coil and magnet unit are enclosed in a plastic housing, then the speaker assembly meets sizing constraints, but heat is trapped and components may become damaged or demagnetized
Solution Approach 1:
A thermally conductive member is introduced as an intermediary between the first and second magnet systems. This member facilitates heat transfer from the high-frequency driver (which generates more heat) to the low-frequency driver (which acts as a heat sink), thereby resolving the heat trapping problem while maintaining the compact plastic housing enclosure
Solution Approach 2:
The two magnet systems are thermally coupled together through the thermally conductive member, merging their thermal management functions. The low-frequency driver's magnet system serves dual purposes: generating acoustic output and acting as a heat sink for the high-frequency driver, thus improving overall thermal dissipation within the constrained volume
2Reliability
If the magnet unit exceeds a given temperature, then the magnet unit may become demagnetized, but increasing heat transfer requires additional thermal pathways
Solution Approach 1:
The low-frequency driver's magnet system serves multiple functions: it generates acoustic output and simultaneously acts as a heat sink for the high-frequency driver. This multi-functionality improves magnet unit stability by providing thermal management without adding separate cooling components, thus avoiding increased device complexity
Solution Approach 2:
The system uses its own components (the low-frequency driver's magnet system) to provide thermal management for the high-frequency driver. This self-service approach eliminates the need for external cooling mechanisms, maintaining simplicity while protecting against demagnetization
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 design enhances heat transfer between drivers, reducing the risk of component damage and improving power handling capacity by effectively managing thermal dissipation within the constrained space of portable devices.
Implementation Method 1
A thermally conductive portion or bridge may directly join the first magnetic system yoke to the second magnetic system yoke in order to enhance heat transfer between the first and second micro speaker drivers
Data Source
AI summary
Embodiments of the invention include a micro speaker assembly that has two drivers, each having a separate yoke, set of magnets, voice coil, and acoustic diaphragms. One driver may produce high frequency (HF) sound while the other produces low frequency (LF) sound. The two drivers may be packaged, side-by-side, within the same micro speaker acoustic enclosure. The drivers may have their respective magnet systems physically connected to each other, in order to enhance heat transfer from one to the other. In particular, a thermally conductive portion or bridge may be used to directly join or thermally connect adjacent edges of the yoke portions of the two magnet systems, in order to enhance heat transfer between the first and second micro speaker drivers. Thus, the assembly can handle more power without overheating. Other embodiments are also described and claimed.