Conductive Adhesive Sheet Layout for Stable Low-Particle Connections
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Solution Overview
Problem
Conductive adhesive sheets with reduced conductive particle content exhibit lower conductivity and connection stability, necessitating a solution that maintains stability while minimizing particle usage.
Innovation Solution
The conductive adhesive sheet is designed with specific arrangements of conductive particles, controlling the relationship between particle diameters and spacing, and regulating their distribution to ensure adequate dispersion and adhesion, even with a lower proportion of particles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If the amount of conductive particles is reduced to minimize material usage, then economic cost decreases, but conductivity and connection stability deteriorate
Solution Approach 1:
The patent applies local quality by creating different particle distribution densities in different regions. The center region has a first particle distribution density while the peripheral region has a second particle distribution density that is different from the first. This allows optimized particle usage - sufficient particles in the center for stable connection, and adjusted particles at periphery for economic efficiency, resolving the contradiction between material reduction and connection stability.
Solution Approach 2:
The patent changes the parameter of particle distribution density across different regions of the adhesive sheet. By setting the ratio of first particle distribution density to second particle distribution density within specific ranges (0.5-2.0 or 0.3-3.0), the patent achieves both reduced overall particle content and maintained connection stability through optimized local density parameters.
2Ease of manufacture
If conductive particles are uniformly distributed, then manufacturing simplicity is maintained, but connection stability deteriorates with reduced particle content
Solution Approach 1:
The patent implements local quality by deliberately creating non-uniform particle distribution with different densities in center and peripheral regions. This controlled non-uniformity improves connection stability while maintaining manufacturing feasibility through defined density ratios and spatial relationships between regions.
Solution Approach 2:
The patent transitions from uniform single-density distribution to multi-dimensional particle distribution by introducing spatial variation in particle density across the adhesive sheet surface. The center and peripheral regions are defined with specific dimensional relationships (peripheral region width 0.1-0.5 times sheet width), creating a two-dimensional density gradient that enhances connection stability.
Data Source
AI summary
Provided is a conductive adhesive sheet that has excellent connection stability even containing conductive particles in a small proportion. The inventive conductive adhesive sheet contains a binder component and conductive particles. The conductive particles are distributively arranged. Assume that all the conductive particles are regularly arranged; and that an optional region of the conductive adhesive sheet is viewed in plan view so that a distribution number Np of the distributed conductive particles be 9 to 25, a condition: 1.5X≤Y≤100X is met, where X represents the average of equivalent circle diameters of the distributed conductive particles; and Y represents the center-to-center distance between adjacent two of the distributed conductive particles, which are regularly arranged in the plan view. The ratio N/Np is 1.0 to 100.0, where N represents the number of the primary particles in the optional region. When optional three unique regions including the optional region are viewed in plan view so that the distribution number Np in each region be 9 to 25, the ratio Ng/Np is 0.8 to 1.0, where Ng represents the distribution number of conductive particles present in two or more of the three regions.