Audio Cable Microphonics Reduction via Release Liner
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Solution Overview
Problem
Conventional audio cables experience significant microphonics issues due to the difficulty in separating conductive layers from dielectric materials, leading to poor conductivity and noise performance, especially when using foamed dielectrics or non-foamed materials without release agents, which either tear or degrade the cable.
Innovation Solution
A coaxial audio cable design featuring a conductive PE layer surrounded by a mechanically and electrically non-conductive PVC release liner, ensuring easy separation and maintaining high conductivity, along with a copper shield and PVC outer jacket, effectively reducing microphonics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conductive layer made of electrically conductive PE is used to achieve high conductivity and low microphonics, then the electrical resistance decreases and microphonic behavior improves, but the conductive layer cannot be separated from the dielectric without causing the dielectric to tear off
Solution Approach 1:
A release agent layer is introduced between the conductive PE layer and the polyolefin dielectric. This intermediary layer prevents direct bonding between the two components, enabling easy separation during cable processing while maintaining the high conductivity and low microphonic characteristics of the PE conductive layer
2Ease of manufacture
If a release agent is applied between the conductive layer and dielectric to enable separation, then the ease of manufacture improves, but the microphonic behavior deteriorates significantly
Solution Approach 1:
The release agent is applied in a controlled manner with specific thickness and conductivity parameters. By optimizing these parameters, the release agent enables easy separation while minimizing its negative impact on microphonic behavior. The conductive PE layer's high conductivity compensates for the presence of the release agent
3Ease of manufacture
If a conductive layer made of PVC is used instead of PE to achieve easy separation, then the ease of manufacture improves, but the conductivity decreases and microphonics increase
Solution Approach 1:
The release agent layer serves as the separation mechanism rather than relying on PVC's inherent properties. This allows the use of conductive PE with superior conductivity while the release agent handles the separation function, eliminating the need to compromise conductivity by using PVC
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 cable achieves improved microphonic behavior with enhanced conductivity and easy processing, outperforming conventional designs by ensuring the separation of dielectric and conductive layers without compromising noise performance.
Implementation Method 1
An additional layer (16) is inserted between the dielectric (12) and the conductive layer (14). This layer (16) serves mechanically as a separating layer and electrically as a dielectric
Implementation Method 2
The conductive layer made of electrically conductive PE has a relatively high conductivity, i.e. compared to a layer made of conductive PVC, the electrical resistance of a layer made of conductive PE is significantly lower
Implementation Method 3
The cable also has a helical copper shield (18) surrounding the conductive layer (14)
Implementation Method 4
a dielectric (conductor insulation) of solid or foamed polyolefins (PE or PP)
Data Source
AI summary
Coaxial cable, especially an audio cable, with inner conductor (10) surrounded by dielectric (12), conducting layer (14) surrounding the dielectric with a separating layer (16) between the dielectric and conducting layer (14).