Rubber Diaphragm Block Polymer for Low-Frequency THD Reduction
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Solution Overview
Problem
Existing rubber diaphragms in sound devices struggle to accurately control damping performance, leading to significant distortion (THD) in specific frequency bands, which affects sound quality.
Innovation Solution
A rubber diaphragm incorporating a block polymer with controlled chemical crosslinking points, prepared through living polymerization, to adjust and control damping performance, reducing THD in sound devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional rubber materials are used for diaphragms, then the diaphragm can be manufactured with simple structure, but the damping performance cannot be accurately controlled and THD is high
Solution Approach 1:
The patent uses block copolymers composed of different polymer blocks (e.g., polybutadiene and polyisoprene blocks) to create a composite material structure. Each block contributes different properties, enabling precise control of damping characteristics while maintaining manageable structural complexity through controlled chemical composition rather than physical layering.
Solution Approach 2:
The patent controls damping performance by adjusting parameters of the block copolymer including the proportion of different blocks, molecular weight distribution, and crosslinking density. By varying these parameters within specific ranges, the damping peak position and height can be precisely controlled to reduce THD at target frequencies.
2Ease of manufacture
If the diaphragm structure is simplified for ease of manufacture, then production is easier, but the ability to reduce THD in specific frequency bands is limited
Solution Approach 1:
The patent achieves THD control in specific frequency bands by adjusting compositional parameters of the block copolymer rather than complicating the manufacturing process. The polymerization conditions, block ratios, and crosslinking parameters are optimized to place damping peaks at target frequencies, maintaining simple diaphragm construction while achieving precise acoustic performance.
3Reliability
If damping performance is increased to reduce THD, then sound quality improves, but the frequency response characteristics may be affected
Solution Approach 1:
The patent applies damping enhancement locally at specific frequency bands where THD needs reduction, rather than uniformly across all frequencies. The block copolymer structure creates targeted damping peaks at predetermined frequencies while maintaining good frequency response characteristics in other bands, achieving sound quality improvement without compromising overall adaptability.
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 diaphragm achieves precise control over damping characteristics, significantly reducing THD in low-frequency bands while maintaining good frequency response, enhancing sound quality and stability.
Implementation Method 1
the distortion improving agent can be accurately prepared through living polymerization or a main structure of the distortion improving agent is accurately prepared through living polymerization
Implementation Method 2
an end group or at least one block component of the distortion improving agent comprises a special chemical crosslinking having a mass fraction of 0.02-25% and capable of having a chemical reaction
Data Source
AI summary
Rubber diaphragm, sound device and application thereof are provided, rubber diaphragm contains distortion improving agent with mass percentage of 0.2-60%; distortion improving agent is block polymer, and end group or block component of distortion improving agent includes special chemical crosslinking point with mass fraction of 0.02-25%; number average molecular weight of block of distortion improving agent is 300-100000; and distortion improving agent or main structure thereof is accurately prepared through living polymerization. Rubber diaphragm contains distortion improving agent, and structure and content of special chemical crosslinking point are accurately controllable, so that position, height and width of damping peak of rubber diaphragm are accurately controllable, and damping characteristics of rubber diaphragm are accurately controllable. When rubber diaphragm is applied to sound device, distortion (THD) of low-frequency band is accurately reduced while maintaining good frequency response characteristics, and ensuring high in controllability, stable in performance and wide in application.