Liquid Crystal Polymer Printed Wiring Board Orientation Control
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Solution Overview
Problem
Printed wiring boards using liquid crystal polymer (LCP) experience local deviations in physical properties such as dielectric constant and dielectric loss, leading to manufacturing fluctuations in circuit and electronic component characteristics.
Innovation Solution
A printed wiring board with a base member of liquid crystal polymer having a degree of crystal orientation of 0.3 or less in the plane direction, along with an insulating layer and conductor portion, is developed to minimize molecular orientation deviations, ensuring uniform dielectric properties and mechanical integrity, and a method involving dry coating and hot-pressing is used to prevent flow and achieve uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If liquid crystal polymer is used as the base member of the printed wiring board, then mechanical properties and thermal conductivity are improved, but local deviations in dielectric constant and dielectric loss occur
Solution Approach 1:
The invention changes the degree of crystal orientation parameter of the liquid crystal polymer from a higher value to 0.3 or less. This parameter change transforms the molecular arrangement from a highly oriented state to a more random state, thereby reducing local deviations in dielectric properties while maintaining the mechanical strength and thermal conductivity benefits of the liquid crystal polymer material.
2Strength
If the degree of crystal orientation of liquid crystal polymer is increased, then mechanical strength is improved, but molecular orientation deviations increase causing non-uniform dielectric properties
Solution Approach 1:
The invention optimizes the degree of crystal orientation parameter to 0.3 or less, finding the optimal balance point where mechanical strength is sufficient while molecular orientation deviations are minimized. This parameter optimization ensures uniform dielectric properties across the base member.
Solution Approach 2:
The invention uses liquid crystal polymer as a composite material in the base member, leveraging its inherent mechanical strength and thermal conductivity while controlling its crystal orientation to achieve uniform electrical properties. The liquid crystal polymer is processed to achieve a specific crystal orientation state that balances mechanical and electrical performance.
3Ease of manufacture
If thermoplastic resin is used as the base member, then ease of multilayering by thermocompression bonding is improved, but uniformity of dielectric properties deteriorates
Solution Approach 1:
The invention employs liquid crystal polymer as a specialized composite material that combines the thermoplastic properties needed for easy multilayering with controlled crystal orientation to achieve uniform dielectric properties. The material maintains thermocompression bonding capability while eliminating the dielectric non-uniformity issue.
Solution Approach 2:
The invention changes the crystal orientation parameter of the liquid crystal polymer to 0.3 or less, which maintains the material's processability for multilayering while achieving uniform dielectric properties throughout the base member.
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 results in reduced manufacturing variations of circuit and electronic component characteristics, improved bondability, and enhanced mechanical and electrical properties, suitable for multilayering with reduced dielectric and thermal deviations.
Implementation Method 1
the base member has a degree of crystal orientation of the liquid crystal polymer of 0.3 or less in a plane direction
Implementation Method 2
The thermoplastic resin has advantageous properties as the bamse member of the printed wiring board, such as being easily multilayered by thermocompression bonding
Data Source
AI summary
A printed wiring board and the like in which local deviations of characteristics of a bamse member using a liquid crystal polymer are reduced. A printed wiring board uses a liquid crystal polymer having wiring formed on at least one surface as a bamse member, in which the bamse member has a degree of crystal orientation of the liquid crystal polymer of 0.3 or less in a plane direction.