Electromagnetic Driver Coil Assembly Vibration Sounding
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing vibration sounding devices in mobile terminals face challenges with high voltage requirements for piezoelectric drivers, limited driving forces of moving coil type drivers, and high assembly complexities of electromagnetic type drivers, leading to increased costs and reduced reliability and acoustic performance.
Innovation Solution
A vibration sounding device with an electromagnetic driver comprising a housing, coil assembly, and magnet assemblies, supported by elastic members, which generates a stable and balanced electromagnetic driving force to vibrate and sound the panel, reducing assembly requirements and magnetic leakage, and improving acoustic performance across different screen types.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If piezoelectric-type driver is used, then the mobile terminal can achieve vibration sounding function, but the voltage requirement increases and battery arrangement needs adjustment
Solution Approach 1:
The patent replaces the piezoelectric driver with an electromagnetic driver consisting of a coil assembly and magnet assemblies. This substitution changes the driving mechanism from piezoelectric effect to electromagnetic interaction, generating driving force through electromagnetic fields rather than requiring high voltage direct application to piezoelectric materials.
Solution Approach 2:
The patent changes the operating parameters from high voltage requirements to current-driven electromagnetic fields. The coil assembly generates magnetic fields that interact with the magnet assemblies to produce mechanical driving force, transforming the energy conversion parameters from voltage-based to current-and-magnetic-field-based operation.
2Power
If moving coil type driver is used, then the mobile terminal achieves vibration sounding, but the driving force is limited and acoustic performance is restricted
Solution Approach 1:
The patent divides the driving system into separate coil assembly and magnet assemblies positioned at opposite sides of the coil. This segmentation allows the magnetic fields from multiple magnet assemblies to act on the coil assembly simultaneously, generating stronger and more distributed driving forces compared to a single moving coil structure.
Solution Approach 2:
The patent employs magnet assemblies with curved or arc-shaped magnetic poles that face the coil assembly. This curvature design allows for more uniform magnetic field distribution across the coil assembly, maximizing the electromagnetic interaction area and generating stronger overall driving force while maintaining balanced acoustic output.
3Force
If electromagnetic type driver is used, then the driving force requirements are met, but the screen is subject to great suction force and assembly requirements increase
Solution Approach 1:
The patent introduces a supporting structure with elastic supporting members as an intermediary between the electromagnetic driver components and the screen. This intermediary structure bears the suction force generated during operation, transmitting it to the housing rather than directly to the screen, thereby reducing assembly complexity and protecting the screen from excessive forces.
Solution Approach 2:
The elastic supporting members automatically adjust to balance the suction force during operation. The supporting structure is designed to self-regulate the forces through its elastic properties, reducing the need for complex external adjustment mechanisms and simplifying the overall assembly process while maintaining stable operation.
4Force
If electromagnetic driver is used, then driving force is sufficient, but magnetic leakage increases and interference with other components occurs
Solution Approach 1:
The patent converts the potentially harmful magnetic leakage into a beneficial concentrated magnetic field by using magnet assemblies with specifically designed magnetic poles. The magnetic poles are configured to direct and concentrate the magnetic flux through the coil assembly, maximizing the driving force while minimizing stray magnetic fields that could cause interference with other components.
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 solution achieves improved acoustic performance and reliability by providing a flatter and more stable driving force, reducing assembly complexities, and maintaining high-frequency performance, making it suitable for various screen types while minimizing magnetic interference with other components.
Implementation Method 1
The coil assembly and the magnet assemblies are used to provide an electromagnetic driving force in the vibrating direction
Implementation Method 2
The first elastic member is connected between the coil assembly and the housing and configured to provide an elastic supporting force for the coil assembly
Data Source
AI summary
A vibration sounding device includes a panel, and an electromagnetic driver attached to the panel and configured to drive the panel to vibrate and sound. The electromagnetic driver includes a housing, a driving unit received in the housing, and a cover. The cover is attached to the panel. The driving unit includes a coil assembly mounted to the cover and a pair of magnet assemblies mounted to the housing. The coil assembly includes a coil defining an axial direction around which the coil is wound. The pair of magnet assemblies is located at opposite sides of the coil assembly with gaps formed therebetween in the axial direction. The electromagnetic driver includes a first elastic member configured to support the coil assembly in the housing. The first elastic member is connected between the coil assembly and the housing and configured to provide an elastic supporting force for the coil assembly.