Speaker Yoke Through-Hole Layout for Cooling Integrated Circuit Boards
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Solution Overview
Problem
Existing integrated speakers with drive amps face issues of heat buildup due to heat-generating components, which impede sound pressure transmission and hinder effective cooling, especially in confined spaces.
Innovation Solution
A speaker design with a through hole in the inner-side yoke of the magnetic circuit portion housing circuit boards with heat-generating components, allowing airflow to dissipate heat effectively while minimizing interference with sound pressure transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If heat-generating components are disposed on the sound pressure transmission path (frontward of diaphragm), then cooling effects are improved, but sound production characteristics deteriorate due to diffraction phenomenon
Solution Approach 1:
The circuit board with heat-generating components is extracted from the sound pressure transmission path and relocated to the magnetic gap region where it does not interfere with sound propagation. The through-hole in the inner-side yoke provides a dedicated cooling passage that bypasses the acoustic path, separating the thermal management function from the acoustic function.
Solution Approach 2:
The cooling airflow is redirected to flow through the magnetic gap region (a different spatial dimension) rather than through the frontward sound pressure path. The through-hole in the inner-side yoke creates a three-dimensional cooling route that utilizes the magnetic circuit structure to achieve heat dissipation without compromising acoustic performance.
2Volume of moving object
If drive amp is disposed rearward of diaphragm with magnetic circuit portions, then size is reduced, but effective cooling by diaphragm vibration is difficult to achieve
Solution Approach 1:
The magnetic gap region serves dual functions: it maintains the magnetic circuit for voice coil operation and provides a cooling passage for heat-generating components. The airflow generated by diaphragm vibration is utilized both for acoustic output and for cooling the circuit board positioned in the magnetic gap, achieving multi-functionality in a compact design.
Solution Approach 2:
The magnetic gap acts as an intermediary space that facilitates both magnetic flux passage and cooling airflow. The through-hole in the inner-side yoke creates a controlled passage that guides the cooling airflow through the magnetic gap region, enabling effective heat dissipation without increasing speaker size.
3Volume of moving object
If circuit board is positioned in through-hole of inner-side yoke, then speaker size is reduced, but heat dissipation path may be blocked
Solution Approach 1:
The inner-side yoke is segmented with a through-hole that creates a dedicated cooling passage. The circuit board is positioned within this segmented space, allowing the yoke structure to simultaneously provide mechanical support and thermal management pathways. The segmentation enables independent optimization of structural and thermal functions.
Solution Approach 2:
The cooling system utilizes dynamic airflow generated by diaphragm vibration rather than static heat sinks. The through-hole configuration allows the cooling effectiveness to vary dynamically with diaphragm motion, enhancing heat dissipation during active operation when vibration-induced airflow is strongest.
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 achieves a compact speaker size with improved cooling effects by utilizing airflow generated by the vibration unit, reducing heat buildup and maintaining sound quality.
Implementation Method 1
an airflow, generated in a frontward direction by vibrations of the diaphragms
Implementation Method 2
applying an airflow... to the heat-generating components, thereby improving heat dissipation effects
Implementation Method 3
a magnetic circuit portion that applies a magnetic flux to the voice coil
Data Source
AI summary
A through hole is formed in an inner-side yoke making up a magnetic circuit portion, passing therethrough following a vibration direction of a vibration unit, and circuit boards are disposed in the through hole. The circuit boards are disposed with board surfaces thereof following the vibration direction of the vibration unit. Also, an opening area of a middle space across which the circuit boards oppose each other is larger than opening areas of side spaces. Accordingly, flow quantity of air through the through hole can be obtained, increase in air resistance at the time of vibration of the vibration unit can be suppressed, and also wind velocity can be obtained, whereby cooling effects of heat-generating components mounted on the circuit boards can be improved.