Linear Vibrator Magnet Array Segmentation
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Solution Overview
Problem
The utilization ratio of the magnetic field in existing linear vibrators for mobile terminal devices is not maximized due to the configuration of magnets and voice coils, resulting in inefficient vibration generation.
Innovation Solution
The design includes a magnet array with an odd number of longitudinally magnetized and an even number of transversely magnetized magnets arranged alternately, with a second soft magnetic plate increasing the attractive force between voice coils and magnets, and a housing structure that enhances magnetic field distribution, increasing the magnetic field strength near the voice coil and reducing leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If three magnets are arranged side by side with magnetic induction intensity at the end being the same, then the magnetic field lines can pass through the voice coil to drive it via Lorentz force, but the utilization ratio of the magnetic field by the voice coil is not maximized because only the magnetic field lines at one side of the magnet pass through the voice coil
Solution Approach 1:
The magnet array is segmented into multiple magnets with different magnetization directions (longitudinal and transverse alternating arrangement). This segmentation allows different regions of the magnet array to contribute magnetic field lines to the voice coil, increasing the proportion of magnetic field lines that pass through the voice coil and improving magnetic field utilization ratio.
Solution Approach 2:
Different magnets in the array are given different local magnetization qualities (longitudinal vs. transverse directions). This local differentiation ensures that magnetic field lines from various positions and directions can converge through the voice coil, maximizing the utilization of the magnetic field while maintaining adequate driving force.
2Power
If the magnetic field strength near the voice coil is increased to improve driving force, then the utilization ratio of magnetic field improves, but magnetic-flux leakage increases
Solution Approach 1:
A second soft magnetic plate is introduced as an intermediary component between the magnet array and the voice coil. This soft magnetic plate serves as a magnetic flux guide that concentrates and directs magnetic field lines toward the voice coil, increasing magnetic field strength in the relevant region while containing the magnetic flux and reducing leakage to the surrounding environment.
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 configuration enhances the driving force and utilization ratio of the magnetic field, allowing for more efficient vibration and potential miniaturization of the linear vibrator while reducing magnetic-flux leakage.
Implementation Method 1
The magnetic field lines close to the voice coil pass through the voice coil so that the voice coil is driven by Lorentz force while electrified
Implementation Method 2
The magnetic lines at the side far away the voice coil are concentrated on the soft magnetic material connected to the magnets to form magnetic circuit
Data Source
AI summary
The present disclosure relates to a linear vibrator including a bottom plate, a voice coil fixed on the bottom plate, a mass block which has a receiving space and located above the voice coil, a magnet array in the receiving space, the magnet array including odd number of longitudinally magnetized first magnets and even number of transversely magnetized second magnets, the first magnets and the second magnets being arranged alternately in a row, and the adjacent first magnets in opposite magnetization direction and the adjacent second magnets in opposite magnetization direction.