Multipole Engine Array Loudspeaker for 360-Degree Sound Diffusion
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Solution Overview
Problem
Traditional loudspeakers face issues with distortion and limited sound diffusion due to uneven force distribution on the membrane and narrow directivity, particularly in mid-range and tweeter units, where wavefronts are either spherical or plane waves, leading to inadequate radiation beyond 120° and phase distortion.
Innovation Solution
A multipole engine array system is introduced, featuring a cylindrical loudspeaker with an annular array of engine assemblies forming a multipole magnetic field, where each engine assembly includes a magnetic conduction plate and magnet, creating a U-shaped magnetic field that drives a membrane with multiple pole faces to radiate sound waves uniformly over 360°, reducing distortion and increasing power resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional voice coil and membrane structure is used, then the driving force can be transmitted to the membrane, but the force distribution is uneven causing distortion and delay
Solution Approach 1:
The single voice coil is divided into multiple independent voice coils (first, second, third, and fourth voice coils) positioned at different locations around the membrane. Each voice coil receives driving signals and generates electromagnetic forces that are more uniformly distributed across the membrane surface, eliminating the concentration of force at the center and reducing distortion and delay.
Solution Approach 2:
Multiple voice coils are combined to work together in a coordinated manner, with their electromagnetic forces merging to create a unified and balanced driving effect on the membrane. This combined approach ensures uniform force distribution while maintaining synchronized membrane response.
2Manufacturing precision
If plane wave radiation is used, then distortion is reduced, but the diffusion ability and off-axis directivity drop sharply beyond 120°
Solution Approach 1:
The system transitions from conventional single-directional plane wave radiation to three-dimensional spherical wave radiation by positioning multiple voice coils around the membrane in a spatial arrangement. This dimensional change enables sound to radiate uniformly in all directions (360° coverage) while maintaining low distortion through coordinated operation of all voice coils.
3Device complexity
If the membrane and voice coil are integrated in a single structure, then the construction is simplified, but the frequency band is limited and resonant frequency cannot be lowered below 2000 Hz
Solution Approach 1:
The integrated membrane-voice coil structure is segmented into independent components: the membrane and multiple separate voice coils. This segmentation allows each component to be optimized independently, enabling the system to achieve a broader frequency range and lower resonant frequencies while maintaining manageable construction complexity through modular assembly.
4Adaptability or versatility
If air motion tweeter with wrinkle membrane is used, then frequency width is improved, but air vortex and standing waves cause additional distortion
Solution Approach 1:
The wrinkle structure is extracted and removed from the membrane design. Instead of using a wrinkle-shaped membrane that causes air vortex and standing waves, the invention employs a smooth membrane surface that eliminates these harmful aerodynamic effects while maintaining broad frequency bandwidth through the coordinated operation of multiple voice coils.
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 multipole engine array system achieves complete sound diffusion over 360° with reduced group delay and faster response speed, enhancing audio signal resolution and power efficiency by uniformly pushing the membrane and reducing phase distortion.
Implementation Method 1
each of the engine assemblies includes a magnetic conduction plate and a magnet arranged in the magnetic conduction plate, a magnetic field is formed between the magnet and the magnetic conduction plate
Data Source
AI summary
The present invention provides a multipole engine array system and a loudspeaker, the multipole engine array system comprising a plurality of engine assemblies distributed in an annular array, the plurality of engine assemblies being fixed inside the cylindrical loudspeaker by means of a mounting base provided in a housing of the cylindrical loudspeaker; each engine assembly comprises a magnetic conduction plate and a magnet provided in the magnetic conduction plate; a magnetic field is formed between the magnet and the magnetic conduction plate; and the plurality of engine assemblies are arranged coaxially and annularly along the periphery of the mounting base, so as to form a multipole magnetic field having a plurality of magnetic pole directions. In the present invention, a multipole magnetic field enclosed by planes is formed by means of monopole equal-magnetic-plane magnetic fields in a multipole way, such that each pole face of an inductive diaphragm radiates sound waves with controllable power to any settable angular space at different angles; the diaphragms are driven to vibrate at the same time, so as to form more audio information, improving the power and efficiency of the loudspeaker, and increasing the response speed.