Liquid Developer for Circuit Board Conductive Patterns
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for preparing electrical circuits on resin substrates, such as photolithographic and screen printing, are costly due to the need for masks or plates, and inkjet methods face challenges with conductive ink preparation, wettability control, and thin-film wiring resistance.
Innovation Solution
A liquid developer comprising surface-treated metallic particles and a carrier liquid, where the metallic particles are preferably from Group 4 to 13 metals, with a volume average diameter of 0.001 μm to 5.0 μm, and surface-treated with insulating materials like polyester resin, is used to create conductive patterns on circuit boards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If photolithographic method or screen printing method is used, then circuit patterns can be formed, but the cost is high due to the need for masks or plates
Solution Approach 1:
The invention extracts and eliminates the expensive mask or plate components from the photolithographic and screen printing processes. By using a liquid developer containing metallic particles that can be directly applied and patterned without requiring separate mask or plate tools, the solution removes the source of high manufacturing costs while maintaining the ability to form precise circuit patterns.
Solution Approach 2:
The invention uses a liquid developer that contains metallic particles suspended in a carrier liquid, which can be directly transferred and patterned onto the substrate. This liquid formulation acts as a copyable, flexible alternative to rigid masks or plates, allowing circuit patterns to be reproduced without the need for expensive physical stencils, thereby reducing manufacturing costs while maintaining pattern precision.
2Adaptability or versatility
If inkjet method is used for direct drawing, then circuit patterns can be formed on demand, but there are technical problems with conductive ink preparation, wettability control, and thin-film wiring resistance
Solution Approach 1:
The invention fundamentally changes the parameter of the conductive material from traditional conductive ink to metallic particles suspended in a carrier liquid. This parameter change addresses the reliability issues by using inherent metallic conductivity rather than relying on conductive ink formulations that have problems with preparation, wettability control, and thin-film resistance. The metallic particles provide superior and more reliable electrical conductivity.
Solution Approach 2:
The invention creates a composite material system consisting of metallic particles combined with a carrier liquid. This composite formulation solves the technical problems by combining the excellent electrical conductivity of metals with the applicability and flow properties of a liquid carrier, enabling direct drawing while maintaining high reliability in conductive performance, proper wettability, and low resistance.
3Productivity
If conventional liquid developer is used, then developing can be performed, but the conductive pattern resolution and stability are insufficient
Solution Approach 1:
The invention applies local quality by using metallic particles with specific size distributions (including fine particles for high resolution areas) and surface treatments tailored for the developing process. This allows different regions of the conductive pattern to achieve appropriate resolution and stability, with the liquid developer formulation optimized to deliver consistent particle deposition that maintains high manufacturing precision while preserving developing efficiency.
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
This approach allows for cost-effective and efficient manufacturing of circuit boards with improved conductive pattern resolution and stability, enabling direct drawing of desired circuits without the need for expensive masks or plates.
Implementation Method 1
metallic particles that may be surface-treated using an insulating material
Implementation Method 2
a carrier liquid
Data Source
AI summary
A liquid developer includes metallic particles that may be surface-treated using an insulating material, and a carrier liquid.