Coaxial Earphone Core Layout for Full-Range Sound in Less Height
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Solution Overview
Problem
Existing earphones face challenges in miniaturization due to the need for multiple magnet units to produce high frequency sound, which increases their axial height and contradicts the trend towards smaller package sizes while maintaining high fidelity sound performance.
Innovation Solution
An earphone core design featuring a magnet unit with a magnetic gap, a vibration unit including a diaphragm, coil, and a MEMS tweeter, all coaxially arranged to reduce axial height, and a frame structure that enhances bond strength and acoustic performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If two magnet units are configured to be coaxially stacked to produce high frequency sound, then high frequency sound performance is improved, but the axial height of the earphone core increases
Solution Approach 1:
The patent merges the tweeter function into the existing magnet unit by integrating a tweeter diaphragm with the voice coil assembly. The tweeter diaphragm is positioned at the front surface of the voice coil, allowing both the voice coil (for mid-bass frequencies) and tweeter diaphragm (for high frequencies) to operate within the same magnetic field generated by a single magnet unit, thereby eliminating the need for a separate second magnet unit.
Solution Approach 2:
The single magnet unit is designed to serve multiple functions: it generates the magnetic field for the voice coil to produce mid-bass frequencies and simultaneously provides the magnetic field for the tweeter diaphragm to produce high frequencies. This multi-functional design allows one magnet unit to replace what would traditionally require two separate magnet units.
2Length of stationary object
If a single magnet unit is used to provide low frequency and mid frequency sound, then the axial height is reduced, but high frequency sound capability is lost
Solution Approach 1:
The patent combines the tweeter function into the existing magnet unit by integrating a tweeter diaphragm with the voice coil assembly. The tweeter diaphragm is positioned at the front surface of the voice coil, allowing both the voice coil (for mid-bass frequencies) and tweeter diaphragm (for high frequencies) to operate within the same magnetic field generated by a single magnet unit, thereby eliminating the need for a separate second magnet unit.
Solution Approach 2:
The diaphragm system is segmented into two functional parts: the main diaphragm driven by the voice coil for low and mid frequencies, and the tweeter diaphragm positioned at the front surface of the voice coil for high frequencies. This segmentation allows each part to handle specific frequency ranges while sharing the same magnetic field source.
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 allows for a compact earphone core that provides a full frequency range of sound, including low, mid, and high frequencies, while maintaining a reduced axial height suitable for miniaturized devices.
Implementation Method 1
a coil fixed on a side of the diaphragm facing the magnet unit and inserted in the magnetic gap
Implementation Method 2
a MEMS tweeter fixed on the first magnet; the MEMS tweeter, the coil and the diaphragm are coaxially arranged along a vibration direction of the diaphragm
Implementation Method 3
a magnet unit having a magnetic gap and received in the receiving space, including: a yoke fixed on the frame; and a first magnet fixed on the yoke
Data Source
AI summary
The present disclosure discloses an earphone core having a frame with a receiving space and a magnet unit and a vibration unit both fixed on the frame. The magnet unit includes a yoke and the first magnet. The vibration unit includes a diaphragm and a coil fixed on the diaphragm; a MEMS tweeter for providing high frequency sound is mounted on the first magnet the MEMS tweeter, the coil and the diaphragm are coaxially arranged along a vibration direction of the diaphragm. An axial height of the earphone core is effectively reduced, thereby saving its occupied space when applied in TWS earphone products.