Loudspeaker Compliant Guide Structure for Precise Low-Noise Motion
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Solution Overview
Problem
Existing loudspeakers face issues with guide systems that are prone to noise, deformation, and insufficient stiffness in transverse directions, leading to reduced precision and increased maintenance needs, while also being bulky and costly.
Innovation Solution
A loudspeaker design featuring a ferromagnetic circuit with a central and outer core, a movable magnet within a gap, and a guide system with flexible parts that use deformable joints and rigid connecting portions to constrain movement along a preferred direction, minimizing deformation and noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a guide system with flattened portions is used to allow movement along a single axis, then movement precision is improved, but transverse stiffness is reduced due to deformation of the flattened portions
Solution Approach 1:
The guide system is divided into multiple flattened portions connected by angled portions, creating a segmented structure that allows controlled deformation in the movement direction while maintaining overall structural integrity and transverse stiffness through the rigid connecting angled portions
Solution Approach 2:
Different portions of the guide system have different mechanical properties: the flattened portions are designed to be flexible in the movement direction to allow precise motion, while the angled connecting portions are designed to be rigid to maintain transverse stiffness and prevent unwanted lateral displacement
2Manufacturing precision
If a rolling guide system is used between moving and fixed parts, then movement guidance is improved, but noise is increased due to the rolling contact
Solution Approach 1:
The rolling guide system is replaced with a flexible guide system based on elastic deformation of the flattened portions. This substitution eliminates the rolling contact that generates noise while maintaining precise movement guidance through the controlled flexibility and rigidity of the segmented structure
3Ease of operation
If retaining bands with flattened portions are used for guidance, then single-axis movement is enabled, but the structure becomes more complex and costly
Solution Approach 1:
Multiple functions are merged into a single guide system structure: the flattened portions provide movement guidance, the angled portions provide structural support and transverse constraint, and the entire assembly integrates the moving and fixed parts. This merging reduces the need for separate guide components, simplifying the overall structure while maintaining single-axis movement control
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 ensures high rigidity and precision in motion, reduces noise, and maintains a compact, lightweight structure, while being cost-effective.
Implementation Method 1
a coil, configured to generate a magnetic field along a longitudinal axis
Implementation Method 2
the magnet moves along a movement direction inside the gap responsive to the magnetic field generated by the coil
Implementation Method 3
the deformable joints are interposed between the rigid connecting portions so as to guide the magnet along the movement direction by elastic deformation of the flexible part
Data Source
Figure 1A~1B
Figure 1C~1D
Figure 2~3B
AI summary
A loudspeaker (1), comprises: a coil (301C), configured to generate a magnetic field along a longitudinal axis (X); a ferromagnetic circuit including: a central core (301A), around which the coil (301C) is wound, and an outer core (301B) located at the side of the coil (301C) and separate from the central core (301A) so as to define a gap (T), wherein the coil (301C) and the ferromagnetic circuit constitute a fixed working unit; a magnet (302), located in the gap (T) and movable inside the gap (T) along a movement direction (M) responsive to the magnetic field generated by the coil (301C); a radiator which is operatively coupled to the magnet (302), wherein the magnet (302) and the radiator constitute a movable working unit; a guide system comprising a flexible part (60) constituting a compliant mechanism, connected to the movable working unit and to the fixed working unit, the flexible part (60) having a plurality of deformable joints and a plurality of rigid connecting portions, the deformable joints being interposed between the rigid connecting portions so as to guide the magnet (302) along the movement direction (M) by elastically deforming the flexible part (60).