Laser Etching Optical Film Mold Stereostructures
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for manufacturing molds for optical films face challenges in reproducibility and controlling the formation of secondary structures, leading to issues like Moire, wet-out, and Newton ring phenomena, as well as adhesion between films, which affect the optical performance and reliability of the films.
Innovation Solution
A process involving laser beam etching is used to create stereostructures on the mold surfaces, allowing for precise control of protrusion height, diameter, and distance, and the formation of convex lens shapes to improve the optical performance and reduce defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If bead sanding process is used to relieve lens structure regularity, then Moire phenomenon is reduced, but manufacturing precision and reproducibility deteriorate due to uncontrollable bead injection positions
Solution Approach 1:
The patent replaces the mechanical bead sanding process with a laser-based processing system. The laser beam precisely irradiates the mold surface to form secondary structures at controlled positions on the lens structures, eliminating the uncontrollable random injection of beads while maintaining the ability to relieve Moire phenomenon through controlled irregularities in the lens structure patterns
Solution Approach 2:
The laser processing system uses the mold's own lens structure geometry to determine the positioning of secondary structures. By irradiating the mold surface with a laser beam that follows the lens structure contours, the system automatically forms secondary structures at appropriate positions without requiring external positioning mechanisms or bead injection control
2Object-affected harmful factors
If bead sanding process is used to form secondary structures, then lens structure regularity is relieved, but optical performance deteriorates due to random secondary structure formation and increased haze
Solution Approach 1:
The patent replaces the mechanical bead sanding process with a laser-based processing system that provides precise control over secondary structure formation. The laser beam selectively irradiates the mold surface to create controlled irregularities that relieve Moire phenomenon while maintaining optimal optical performance by preventing excessive or random secondary structure formation that would increase haze
Solution Approach 2:
The patent changes the processing parameters from random mechanical bead impact to controlled laser irradiation parameters including beam intensity, scanning speed, and irradiation pattern. This allows precise control over the depth, distribution, and morphology of secondary structures to achieve the optimal balance between Moire relief and optical performance
3Object-affected harmful factors
If bead sanding process is used to modify lens structures, then some optical defects are improved, but device complexity increases due to multiple uncontrollable sanding processes
Solution Approach 1:
The patent replaces the complex mechanical bead sanding system with a simpler laser processing system. The laser beam can be precisely directed and controlled through software to create the required secondary structures in a single controlled process, eliminating the need for multiple sanding operations and reducing overall process complexity
Solution Approach 2:
The laser processing system automatically adapts to the mold's lens structure geometry, using the lens patterns themselves as guides for secondary structure formation. This self-aligning capability eliminates the need for complex positioning and multiple processing steps required by bead sanding methods
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 enhances reproducibility and optical performance by forming consistent secondary structures that effectively suppress Moire, wet-out, and Newton ring phenomena while preventing blocking between films, maintaining brightness and reducing haze.
Implementation Method 1
etching a stereostructure in a surface of the mold using a laser beam
Data Source
AI summary
There is provided a process of making a mold for optical films. The process of making a mold for optical films comprises: etching a stereostructure in a surface of the mold having a flat surface or an engraved convex and concave surface, by using a laser beam. The process of making a mold for optical films may be useful to easily mark spots, to control the height of protrusions and the position where the protrusions are formed, and also to form the protrusions having constant depths even in a curved surface such as a convex and concave surface.