Multi-Magnetic Circuit Loudspeaker for Compact Automotive Cooling
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Solution Overview
Problem
Conventional loudspeakers for automotive audio systems, whether single-spider or multi-input types, face issues of being heavy, bulky, requiring large installation depth, poor heat dissipation, inconvenient assembly, and poor structural stability, making them unsuitable for use in automotive audio systems on car roofs or headrests.
Innovation Solution
A multi-magnetic circuit loudspeaker design featuring a yoke with multiple cavities and a connecting channel that houses multiple voice coils, allowing for shared heat dissipation and improved structural stability, along with a diaphragm and spider configuration for enhanced vibration and assembly efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If multiple magnetic drive units with separate yokes are used to increase power, then power output is improved, but device complexity and assembly difficulty increase
Solution Approach 1:
The patent merges multiple separate yokes into a single integrated yoke structure that contains multiple cavities. Each cavity houses a magnet assembly and corresponds to a voice coil, allowing multiple magnetic drive units to share one common yoke. This integration reduces the number of separate components and simplifies assembly while maintaining high power output capability.
2Power
If multiple separate magnetic drive units are used to increase power, then power output is improved, but heat dissipation performance deteriorates
Solution Approach 1:
The patent combines multiple magnetic drive units into a shared yoke structure with internal cavities. The yoke serves as a common heat dissipation pathway for all voice coils, allowing heat generated by multiple high-power voice coils to be efficiently conducted away through the single yoke structure, thereby improving overall heat dissipation performance.
3Device complexity
If conventional single-spider loudspeaker design is used, then structural simplicity is maintained, but weight and size increase
Solution Approach 1:
The patent merges multiple magnetic drive units into a single integrated yoke assembly with multiple cavities, reducing the overall number of separate components. This integration eliminates the need for multiple separate yokes and associated mounting structures, thereby reducing total weight while maintaining structural simplicity and ease of assembly.
4Volume of moving object
If loudspeaker is miniaturized for automotive installation, then installation space is reduced, but heat dissipation capability deteriorates
Solution Approach 1:
The patent employs a nested structure where multiple magnet assemblies are placed within cavities of the yoke. The cavities are arranged to maximize space utilization within the compact yoke volume. This nested arrangement allows multiple high-power voice coils to be housed in a small footprint while the yoke provides efficient heat conduction pathways, achieving both miniaturization and effective heat dissipation.
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 design provides good heat dissipation, simplifies assembly, ensures structural stability, and enhances acoustic performance with reduced distortion and improved frequency response, making it suitable for automotive audio systems.
Implementation Method 1
each of the voice coils corresponds to one of the magnetic gaps and is inserted into the corresponding magnetic gap; multiple voice coils jointly driving one diaphragm to vibrate
Implementation Method 2
The total heat generated is significant, leading to defects such as poor heat dissipation... the connecting channel located between the plurality of cavities and communicating the plurality of cavities
Data Source
Figure 1
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AI summary
A multi-magnetic-circuit loudspeaker and a vehicle audio system. The multi-magnetic-circuit loudspeaker comprises: a holder; a diaphragm, which is provided with an outer edge connected to an upper end portion of the holder; a plurality of voice coils, each of which has an upper end portion connected to the diaphragm; and a magnetic circuit mechanism, which is provided with a plurality of magnetic gaps, wherein each voice coil corresponds to one magnetic gap and is inserted into the corresponding magnetic gap; and the magnetic circuit mechanism comprises a magnetic conductive bowl connected to the holder, and a plurality of magnet assemblies arranged in the magnetic conductive bowl, the magnetic conductive bowl being provided with a plurality of accommodating channels, each of which is provided with one magnet assembly therein, the magnetic gap being formed between a side wall of each accommodating channel and an outer side surface of the magnet assembly located in the accommodating channel, and the magnetic conductive bowl being further provided with a communicating channel that is located between the plurality of accommodating channels and is in communication with the plurality of accommodating channels. The multi-magnetic-circuit loudspeaker has good heat dissipation performance, is convenient to assemble, has a small number of tooling, and has good structural stability.