Electroacoustic Transducer Magnet Layout for Higher Driving Capability
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Solution Overview
Problem
Conventional moving coil micro-speakers have limited magnetic circuit assembly driving capability due to small magnet sizes, which restricts speaker sensitivity improvement.
Innovation Solution
The electroacoustic transducer design features two side magnets diagonally positioned around the corners of a central magnet, forming a complete magnetic circuit with a voice coil, and includes flexible circuit boards and auxiliary diaphragms to enhance magnetic induction and vibration efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a leakage hole is designed at the corner location of the speaker, then magnetic circuit avoidance is performed, but the size of the magnet is reduced and driving capability is limited
Solution Approach 1:
The patent extends the magnet arrangement from a single central magnet to multiple magnets distributed across different spatial dimensions (central magnet at center, side magnets at corners, corner magnets at intermediate positions). This multi-dimensional distribution allows the magnetic circuit to effectively utilize the entire speaker structure space, including areas around leakage holes, thereby maintaining driving capability while accommodating manufacturing requirements for leakage holes.
2Power
If the magnet size is increased to improve driving capability, then sensitivity is improved, but the overall speaker size increases
Solution Approach 1:
The patent divides the magnetic circuit into multiple segmented magnets (central magnet, side magnets, corner magnets) rather than using a single large magnet. This segmentation allows the magnetic field to be distributed across multiple locations, achieving high driving capability through cumulative effect while maintaining a compact overall speaker size. Each magnet segment contributes to the total magnetic flux without requiring any single magnet to be excessively large.
3Device complexity
If side magnets are arranged on the side surface of the central magnet, then structure is simplified, but magnet loss on outer peripheral sides occurs
Solution Approach 1:
The patent employs an asymmetric magnet distribution pattern where corner magnets are positioned at intermediate locations between the central magnet and side magnets. This asymmetric arrangement specifically targets and fills the magnet loss areas on the outer peripheral sides that would occur with symmetric side-magnet-only arrangements. The asymmetric positioning optimizes magnetic flux distribution across the entire magnetic circuit, reducing energy loss while maintaining structural feasibility.
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 increases the overall magnet size, improves magnetic induction intensity, and enhances the driving capability and sensitivity of the electroacoustic transducer, resulting in better sound quality and performance.
Implementation Method 1
the voice coil can vibrate under an effect of a magnetic field generated by the central magnet and the side magnet during power-on
Implementation Method 2
magnetic induction intensity of the electroacoustic transducer can be effectively improved
Data Source
AI summary
This application provides an electroacoustic transducer and an electronic device, the electroacoustic transducer includes a central magnet, two side magnets, a lower electrode plate, a side electrode plate, a frame, a sound diaphragm, a voice coil, and two flexible circuit boards. The central magnet and the two side magnets are disposed on the lower electrode plate. The side electrode plate is disposed on a surface of the two side magnets which is opposite to the lower electrode plate. Two surfaces of the frame are respectively fixedly connected to the sound diaphragm and a surface of the side electrode plate which is opposite to the lower electrode plate. The voice coil is located inside the frame. The two flexible circuit boards are symmetrically distributed on a peripheral side of the voice coil, two ends of the flexible circuit board are respectively connected to the voice coil and the side electrode plate.