Mold Manufacturing Method for Optical Elements
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional methods for manufacturing molds for optical elements, such as microlens arrays, face challenges in achieving efficient production time and shape accuracy, particularly for complex shapes with a large number of microlenses, due to time-consuming machining and difficulties in forming precise three-dimensional shapes and round edges.
Innovation Solution
A manufacturing method involving machining a metal base into a first shape, coating it with a resin layer, forming the resin layer into a second shape, and then using dry etching to create a third shape, allowing for a combination or overlap of the first and second shapes to achieve the desired mold form.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If machining is used to form a complex mold shape directly, then manufacturing precision can be maintained, but the production time becomes excessively long
Solution Approach 1:
The mold manufacturing process is segmented into multiple stages: initial machining to form a first shape, coating with resin layer, forming a second shape, and final dry etching to create the third shape. This segmentation allows each stage to focus on specific requirements - machining ensures precision while etching handles complexity, resolving the contradiction between precision and production time.
Solution Approach 2:
The base is pre-formed into a first shape by machining before the final etching process. This preliminary action establishes the fundamental structure with high precision through machining, while subsequent etching adds complex features without requiring the entire complex shape to be machined, thus reducing production time while maintaining precision.
2Manufacturing precision
If machining is used to manufacture a mold with a large number of microlenses, then shape accuracy can be achieved, but the manufacturing time becomes impractically long
Solution Approach 1:
The manufacturing process is divided into preliminary machining of the base into a first shape, followed by resin coating and etching to form the final microlens array. This segmentation allows the time-consuming task of creating thousands of microlenses to be performed primarily through etching rather than machining, dramatically reducing manufacturing time while maintaining precision through the controlled multi-stage process.
Solution Approach 2:
The patent replaces mechanical machining with chemical etching for the final shape formation. Etching can create complex microlens arrays with high precision without the time constraints of mechanical tool movement, effectively substituting a slower mechanical process with a faster chemical process for the critical final shaping stage.
3Productivity
If lithography technology is used to manufacture a mold, then production time can be reduced, but difficulty in forming three-dimensional shapes with high accuracy and generation of round edges occurs
Solution Approach 1:
The patent merges the advantages of both machining and lithography by using machining for the initial base preparation and lithography-based etching for the final complex shape formation. This combination allows the process to benefit from the precision of machining in the preliminary stage and the speed and three-dimensional capability of etching in the final stage, resolving the contradiction between speed and precision.
Solution Approach 2:
The base is pre-formed into a first shape by machining before the etching process. This preliminary action provides a stable foundation that facilitates subsequent etching, allowing the etching process to focus solely on creating the complex final shape without the complications of forming basic structures, thereby achieving both speed and precision.
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 method significantly reduces production time while ensuring high shape accuracy, enabling the efficient creation of complex mold shapes like microlens arrays with sufficient precision and speed.
Implementation Method 1
forming the base into a third shape by dry etching
Data Source
AI summary
Provided is a mold manufacturing method that is capable of manufacturing a mold of a complex shape particularly of an optical element with sufficient shape accuracy and within a relatively short time. This mold manufacturing method includes: a step for forming a base made of metal into a first shape through machining; a step for coating the base with a resin layer; a step for forming the resin layer into a second shape; and a step for forming the base into a third shape through dry-etching.