Electroforming Master With Thin Oxide Film For Adhesion
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Solution Overview
Problem
The electroforming method faces challenges in controlling the removal of oxide films on masters with patterns, leading to reduced adhesive strength between the electroforming material and the master, which can result in peeling issues during production.
Innovation Solution
An electroforming master with an n-type semiconductor substrate and a thin oxide film, less than 18 Å thick, containing hydroxyl end-groups, is used, along with specific dry etching and exposure techniques to enhance adhesiveness and prevent peeling, allowing for the formation of an electroforming material with improved surface quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If an oxide film is removed from the master using an acid to improve surface quality, then the surface smoothness is improved, but the adhesive strength between the electroforming material and the master is reduced
Solution Approach 1:
The patent changes the oxide film thickness parameter from a thick state (removed by acid) to a controlled thin state (18 Å or smaller). This parameter change allows the surface to be sufficiently smooth for electroforming while maintaining enough oxide film to preserve adhesive strength between the electroforming material and the master.
Solution Approach 2:
The patent replaces the chemical removal method (acid treatment) with a physical control method (controlling oxide film formation through exposure conditions). This substitution allows precise control of oxide film thickness without the harsh chemical action that completely removes the oxide film and compromises adhesion.
2Manufacturing precision
If a pattern formed by an insulating film is provided on the master to control the shape of electroforming material, then the shape control is improved, but the pattern may be removed when oxide film is removed by acid
Solution Approach 1:
The patent changes the oxide film thickness parameter to 18 Å or smaller, which is thin enough to allow shape control through the insulating film pattern while being thick enough to prevent acid from attacking and removing the pattern. This precise parameter control resolves the contradiction between shape control and pattern integrity.
3Strength
If the oxide film thickness is increased to improve adhesiveness, then the adhesive strength is improved, but the surface smoothness and electroforming quality are reduced
Solution Approach 1:
The patent identifies and applies an optimal parameter range for oxide film thickness (18 Å or smaller). This specific parameter value balances two competing requirements: it provides sufficient oxide film for adhesive strength while maintaining surface smoothness necessary for high-quality electroforming. The precise parameter specification resolves the contradiction between adhesion and surface quality.
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 approach results in excellent adhesiveness between the electroforming material and the master, reducing peeling and cohesion failures, while maintaining surface smoothness and preventing air bubble inclusion, thus enabling efficient and repeated production of electroforming materials.
Implementation Method 1
an oxide film is formed on the surface
Implementation Method 2
performing dry etching on a surface of a substrate
Implementation Method 3
nickel or the like is electroformed on the master to produce an electroforming material
Data Source
Figure 1
Figure 2(A)~2(E)
Figure 3
AI summary
An electroforming master including an n-type semiconductor, and a substrate provided with a pattern on a surface thereof, in which an oxide film is formed on the surface, and a thickness of the oxide film is 18 Å or smaller, a method for producing the above-described electroforming master, and a method for producing an electroforming material using the above-described electroforming master.