Loudspeaker Membrane Hardness and Elasticity Adjustment
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Solution Overview
Problem
Conventional loudspeaker vibrating membranes suffer from poor fatigue resistance and elastic resilience due to hardening and aging of the hard structure, leading to issues like resonance noise, deformation, and poor sound quality, as the materials used for the base and hard polymer have different vibration frequencies.
Innovation Solution
A method to manufacture loudspeaker vibrating membranes with adjustable hardness and elastic properties by impregnating a base material with a curable polymer, forming a hard structure, and then applying an elastic soft polymer through techniques like screen printing or spray coating to create a composite structure that covers all or partial areas, allowing for adjustment of hardness and elastic coefficients.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a hard structure is formed by drying curable polymer to increase the hardness of the loudspeaker vibrating membrane, then the hardness is improved, but the fatigue resistance and elastic resilience deteriorate due to hardening and aging of the hard structure
Solution Approach 1:
The patent applies local quality by creating regions with different material properties within the vibrating membrane. The hard structure is formed in specific areas to provide necessary hardness and structural support, while other areas maintain softer properties to ensure elastic resilience and fatigue resistance. This spatial differentiation of material properties allows the membrane to simultaneously achieve both hardness and reliability.
Solution Approach 2:
The patent employs composite materials by combining the hard curable polymer structure with the base material (cloth) and potentially additional soft polymer layers. This composite construction allows different regions to exhibit different mechanical properties, with the hard structure providing structural integrity and the softer regions providing elasticity and fatigue resistance, thereby resolving the contradiction between hardness and reliability.
2Speed
If a hard structure is formed to enable vibration generation, then the vibration capability is improved, but resonance noise increases due to different vibration frequencies between the base material and hard polymer
Solution Approach 1:
The patent applies local quality by strategically positioning hard structures in areas where structural support is needed while maintaining softer regions in areas requiring elastic vibration. This spatial differentiation allows different parts of the membrane to vibrate at compatible frequencies, reducing resonance noise while preserving overall vibration capability.
Solution Approach 2:
The patent addresses homogeneity by ensuring that the hard structure is properly integrated with the base material through impregnation and controlled drying processes. This creates a more uniform composite structure where the hard and soft regions work together harmoniously, reducing frequency mismatches and resonance noise while maintaining vibration capability.
3Stability of the object's composition
If the hardness of the loudspeaker vibrating membrane is increased to improve structural stability, then the structural stability is improved, but the elastic resilience deteriorates leading to deformation and peeling
Solution Approach 1:
The patent applies local quality by forming hard structures only in specific regions where structural stability is critical, while leaving other regions with softer properties to maintain elastic resilience. This prevents the entire membrane from becoming too hard and losing its ability to elastically recover, thereby avoiding deformation and peeling while still achieving the necessary structural stability.
Solution Approach 2:
The patent employs composite materials construction where the hard curable polymer structure is combined with the softer base material in a controlled manner. This composite structure allows the hard regions to provide structural stability while the softer regions maintain elastic resilience, preventing the deterioration of elastic properties that would lead to deformation and peeling.
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 method enables the adjustment of hardness and elastic coefficients across the loudspeaker vibrating membrane, enhancing fatigue resistance, reducing resonance noise, and improving sound quality by providing better elastic resilience and loaded resilience.
Implementation Method 1
impregnating a base material in a curable polymer, such that the curable polymer adheres to all areas on an outer surface of the base material
Implementation Method 2
adhering an elastic soft polymer to all or partial areas on an outer surface of the hard structure
Implementation Method 3
reducing resonance noise, and improving sound quality by providing better elastic resilience and loaded resilience
Data Source
AI summary
A method for manufacturing a loudspeaker vibrating membrane with hard and elastic soft properties, comprising: (a) adhering a curable polymer to all areas on the outer surface of a base material; (b) drying the curable polymer to form a hard structure; (c) forming a loudspeaker vibrating membrane; and (d) separating the loudspeaker vibrating membrane from the base material. The method further comprises the following steps between steps (b) and (c) or steps (c) and (d), or after step (d): (e) adhering an elastic soft polymer to all or partial areas on the outer surface of the hard structure; and (f) drying the elastic soft polymer to form an elastic soft structure covering all or partial areas on the outer surface of the hard structure. In the present invention, the hardness and elastic coefficient of the loudspeaker vibrating membrane can be adjusted by the hard structure and the elastic soft structure.