Flat Voice Coil Vibration Mechanism for Slim Audio Devices
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Solution Overview
Problem
Current vibration sound-generating devices in portable electronic apparatuses are bulky, difficult to assemble, and have low performance due to their vertical vibration mechanism, which limits slimness, miniaturization, and acoustic sensitivity.
Innovation Solution
A vibration sound-generating device with a flat voice coil and magnetic circuit system that vibrates horizontally, utilizing a mass block and elastic support fixed as an integral structure, allowing for a compact design and improved assembly efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a barrel-shaped voice coil is used in the magnetic gap, then the vibration sound-generating device can generate sound and vibration functions, but the device thickness becomes large
Solution Approach 1:
The patent changes the voice coil from a barrel-shaped three-dimensional structure to a flat two-dimensional structure. The flat voice coil is arranged in a plane perpendicular to the vibration direction, eliminating the need for a barrel-shaped structure that extends along the vibration axis. This dimensional change reduces the thickness of the device while maintaining the sound-generating function.
Solution Approach 2:
The patent inverts the conventional arrangement by placing the flat voice coil in a plane perpendicular to the vibration direction rather than parallel to it. The magnetic gap is also inverted to be arranged in the vibration direction rather than perpendicular to it, allowing the voice coil to be positioned flat and reducing overall device thickness.
2Ease of operation
If a magnetic gap is reserved for the voice coil, then the voice coil can operate, but the magnet size is reduced and magnetic field intensity becomes weak
Solution Approach 1:
The patent repositions the magnetic gap from a three-dimensional space surrounding the barrel-shaped voice coil to a two-dimensional planar arrangement. The magnetic gap is now arranged in the vibration direction with the flat voice coil positioned perpendicular to it, allowing for a more efficient magnetic field distribution that increases intensity while maintaining voice coil operability.
3Power
If a barrel-shaped voice coil is used, then the vibration sound-generating device can function, but the structure becomes complicated and assembly becomes difficult
Solution Approach 1:
The patent inverts the conventional barrel-shaped voice coil structure into a flat voice coil arrangement. This inversion simplifies the overall structure by eliminating the complex barrel-shaped geometry and associated magnetic gap arrangements, making the device easier to manufacture and assemble while maintaining the vibration function.
4Power
If the voice coil is arranged in the vertical direction, then the device can generate sound, but the vibration space in the vertical direction is reduced
Solution Approach 1:
The patent repositions the voice coil from a vertical arrangement to a horizontal flat arrangement perpendicular to the vibration direction. This allows the vibration space in the vertical direction to be fully utilized without being compromised by the voice coil structure, while the sound-generating function is maintained through the horizontal voice coil arrangement that interacts with the magnetic field in the vibration direction.
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 horizontal vibration mechanism results in a thinner, more sensitive, and easier-to-assemble device that meets the demands for slimness and performance in portable electronics, with enhanced acoustic flexibility and vibration feeling.
Implementation Method 1
the voice coil receives the Lorentz force in the magnetic field generated by the magnets, thereby the voice coil vibrates in the horizontal direction
Implementation Method 2
the elastic support suspends the mass block and the magnets in the housing
Implementation Method 3
the voice coil framework drives the vibrating diaphragm to generate a sound
Data Source
AI summary
A vibration sound-generating device comprises a housing and a vibration system and a magnetic circuit system received in the housing, a sound exit hole being provided on a side surface of the housing, wherein the vibration system comprises a vibrating diaphragm, a voice coil and a voice coil framework for connecting the vibrating diaphragm with the voice coil, the voice coil is of a flat structure, and a plane where the voice coil lies is perpendicular to the plane where the vibrating diaphragm lies; the magnetic circuit system comprises magnets, and a plane where the magnets lie is parallel to the plane where the voice coil lies; the vibration sound-generating device further comprises a mass block and an elastic support, and the elastic support suspends the mass block and the magnets in the housing; and the elastic support is an annular structure, the mass block and the magnets are located inside the elastic support, two opposed sides of the elastic support are fixedly connected with the magnets, and the other two sides of the elastic support are fixed on the housing.