Optical Element Mold Release Region Design
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing methods for manufacturing optical elements with fine structures on their surfaces often result in damage to the fine structures during mold release due to high mold release resistance, especially when the fine structures are small or have a high aspect ratio.
Innovation Solution
A method involving the use of a mold with a fine structure forming surface that includes both a fine structure forming region and a mold release region, where the mold release region is located on the outer edge of the fine structure forming surface and has a lower surface roughness than the fine structure forming region, allowing for reduced mold release resistance and minimizing damage to the fine structures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a mold having a fine structure on the surface is used to form fine structures on the optical element during molding, then processing cost is reduced, but the fine structure is destroyed by mold release resistance force
Solution Approach 1:
The mold surface is segmented into two distinct regions: a fine structure forming region with high surface roughness for creating precise fine structures, and a mold release region with low surface roughness for facilitating easy release. This segmentation allows each region to perform its specific function optimally without interfering with the other.
Solution Approach 2:
Different surface qualities are applied to different locations on the mold surface. The fine structure forming region maintains high surface roughness to ensure precise fine structure formation, while the mold release region has low surface roughness to reduce adhesion and facilitate release. This local differentiation resolves the contradiction between fine structure integrity and ease of release.
2Manufacturing precision
If the fine structure is small or has a high aspect ratio, then optical performance is improved, but the fine structure is more susceptible to damage during mold release
Solution Approach 1:
The mold release region with low surface roughness is strategically positioned adjacent to the fine structure forming region, creating a localized area of reduced adhesion. This allows small or high aspect ratio fine structures to be formed with high precision while the adjacent smooth region provides a release pathway that minimizes damage during ejection.
Solution Approach 2:
The mold release region acts as an intermediary zone between the fine structure forming region and the external release mechanism. This intermediate smooth region mediates the release process by providing a low-adhesion pathway that reduces the force transmitted to the fragile fine structures, preventing their destruction.
Data Source
AI summary
The present disclosure provides a method for manufacturing an optical element having a fine structured surface on which a fine structure is formed, by use of a mold having a fine structure forming surface, includes: forming the optical element by filling the mold with a curable composition, and curing the curable composition; and releasing the optical element from the fine structure forming surface, wherein the fine structure forming surface includes a fine structure forming region and a mold release region; the mold release region is provided on at least a part of an outer edge of the fine structure forming surface; and a surface roughness of the mold release region is smaller than a surface roughness of the fine structure forming region.