Shared Magnetic Circuit Sounding Assembly for Thin Haptic Audio
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Solution Overview
Problem
Existing sounding devices in mobile phones face challenges in miniaturization due to increased thickness and interference between magnets, leading to poor acoustic and vibration performance.
Innovation Solution
A multifunctional sounding device with a magnetic circuit system comprising a main magnetic circuit, first and second auxiliary magnetic circuits, and a motor assembly with a suspended driving coil and elastic member, reducing the need for a stator magnet and optimizing space utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the motor assembly is stacked beneath the sounding unit, then the sounding device can be assembled, but the thickness of the sounding device increases
Solution Approach 1:
The patent merges the motor assembly and sounding unit into a shared magnetic circuit system where the stator magnet serves both the voice coil (sounding) and driving coil (motor). This integration eliminates the need for separate magnetic circuits, reducing overall thickness while maintaining independent control of both functions.
Solution Approach 2:
The stator magnet and magnetic circuit system perform dual functions: generating magnetic fields for both the voice coil in the sounding unit and the driving coil in the motor assembly. This multi-functional design allows both sounding and vibration operations to share the same magnetic infrastructure, reducing component count and thickness.
2Reliability
If the magnets of the sounding unit and motor assembly are placed on different planes, then the assemblies can be independently controlled, but the driving forces of their magnetic fields interfere with each other
Solution Approach 1:
The patent combines both magnetic circuits into a single shared stator magnet structure. The voice coil and driving coil are positioned to interact with the same magnetic field source, allowing independent electrical control of each coil while eliminating magnetic field interference that would occur with separate magnet assemblies.
Solution Approach 2:
The magnetic circuit system is segmented into distinct magnetic paths: one path through the voice coil for sounding operations and another path through the driving coil for motor operations. This segmentation allows independent control of each function while sharing the common stator magnet infrastructure.
3Reliability
If multiple magnets are used in the sounding device, then the sounding unit and motor assembly can function independently, but the volume of the device becomes bulky
Solution Approach 1:
The patent merges multiple magnet functions into a single stator magnet assembly that serves both the sounding unit and motor assembly. This consolidation reduces the total number of magnets from multiple separate components to one shared magnetic circuit system, significantly reducing device volume while maintaining independent operational capability.
Solution Approach 2:
The shared stator magnet system provides universal magnetic field generation for both sounding and motor functions. By making the magnetic infrastructure universal rather than dedicated to each function, the patent eliminates redundant magnets and reduces overall device volume.
4Manufacturing precision
If the motor assembly and sounding unit use separate magnetic circuits, then each can be optimized independently, but the overall thickness and volume cannot be reduced
Solution Approach 1:
The patent merges the separate magnetic circuits into a unified shared magnetic system. The stator magnet generates magnetic flux that is distributed to both the voice coil and driving coil through carefully designed magnetic paths, allowing both functions to share the same magnetic infrastructure while maintaining independent electrical control and optimization capability.
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 device achieves a small overall thickness, reduced volume, and enhanced acoustic performance while minimizing part and assembly costs.
Implementation Method 1
a magnetic circuit system with a magnetic gap for driving the vibration system to vibrate and produce sound
Implementation Method 2
an elastic member suspending the vibration unit in the containment space
Implementation Method 3
a vibration unit with a driving coil and an elastic member; a magnetic circuit system with a magnetic gap
Data Source
AI summary
The present disclosure provides a multifunctional sounding device, including a housing body with a containment space and a sounding unit accommodated in the containment space. The sounding unit includes a frame, a vibration system, and a magnetic circuit system. The sounding device further includes a motor assembly accommodated in the containment space, having a vibration unit with a voice coil disposed on a side of the magnetic circuit system away from the vibration system, and an elastic member suspending the vibration unit in the containment space. The overall thickness of the multifunctional sounding device of the present disclosure is small, the volume is small, and the acoustic performance is excellent; this structure also reduces the cost of parts and assembly costs, making the multifunctional sounding device widely used.