Loudspeaker Suspension Segmentation for Axial Excursion and Radial Stiffness
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Solution Overview
Problem
Smaller loudspeakers face challenges in achieving low frequency response due to reduced axial and radial stiffness of the suspension system, which limits the peak-to-peak excursion of the voice coil assembly and increases the risk of contact with other components.
Innovation Solution
A suspension system with a first suspension element having an inner and outer edge, where the outer edge is coupled to the moving assembly and the inner edge is coupled to the frame, and a second suspension element with a cone structure that allows for increased axial displacement while constraining side-to-side motion, utilizing a magnet assembly and a spider element with a flexible material to maintain efficient voice coil assembly movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the axial stiffness of the suspension is reduced to allow greater excursion of the voice coil assembly, then the peak-to-peak axial displacement is improved, but the radial stiffness is similarly decreased allowing greater side to side motion
Solution Approach 1:
The suspension system is divided into two separate elements: a first suspension element (surround) that primarily provides axial compliance for excursion, and a second suspension element (spider) that primarily provides radial stiffness for centering. This segmentation allows each element to be optimized for its specific function without compromising the other.
Solution Approach 2:
Different parts of the suspension system are given different stiffness characteristics tailored to their specific functions. The first suspension element has higher axial compliance while the second suspension element has higher radial stiffness, creating local quality differences that resolve the contradiction between axial displacement and radial stability.
2Volume of moving object
If the loudspeaker becomes smaller, then the device size is reduced, but achieving low frequency response becomes more difficult due to reduced suspension stiffness
Solution Approach 1:
By segmenting the suspension into two specialized elements, the design allows smaller loudspeakers to achieve adequate excursion for low frequency response. The first element provides the necessary axial travel while the second element maintains radial stability, enabling compact designs to overcome the stiffness limitations that normally prevent low frequency performance.
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 enhances rocking stiffness and maintains peak-to-peak axial excursion range, allowing for improved low frequency response without compromising the structural integrity and reducing the risk of voice coil assembly contact with other components.
Implementation Method 1
a spider element with a flexible material to maintain efficient voice coil assembly movement
Data Source
AI summary
A loudspeaker comprising a frame, a voice coil assembly disposed within the frame, a magnet assembly disposed within the frame and a first suspension element having an outer edge and an inner edge, wherein the outer edge is coupled to the voice coil assembly and the inner edge is coupled to the magnet assembly.