Surface Relief Microstructure Replication Without Masks
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for producing replicas of surface relief microstructures are complex and time-consuming, leading to decreased manufacturing yield and increased production time, particularly due to the need for multiple process steps and the use of masks.
Innovation Solution
A method that eliminates the need for mask manufacturing by using a master with a surface relief microstructure to replicate the patterned surface relief microstructure through dry or wet etching processes, where the replica has an inverse surface relief profile, allowing for the use of standard replication techniques like UV embossing and hot embossing to mass-produce optical elements with reduced process steps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional methods using masks are used to produce replicas of surface relief microstructures, then the replication process can be performed, but the number of process steps increases and production time increases
Solution Approach 1:
The patent removes the mask from the replication process entirely. Instead of using a mask to define the pattern, the method directly transfers the surface relief microstructure from the master to the replica material through contact replication, eliminating the mask manufacturing and alignment steps while maintaining replication accuracy
Solution Approach 2:
The master with the surface relief microstructure is prepared in advance, containing all the pattern information needed for replication. This preliminary preparation of the master allows subsequent replicas to be produced directly without requiring masks, as the master itself serves as the pattern definition source
2Manufacturing precision
If traditional methods using masks are used to produce replicas of surface relief microstructures, then the replication process can be performed, but production time increases
Solution Approach 1:
By removing the mask step from the process, the patent eliminates the time required for mask manufacturing, alignment, and removal. The direct contact replication method allows the pattern transfer to occur in a single step, significantly reducing production time while maintaining replication fidelity
Solution Approach 2:
The method creates direct physical copies of the surface relief microstructure from the master to the replica material through contact replication. This copying process eliminates intermediate steps involving masks, allowing rapid production of accurate replicas without the time penalty of mask-based methods
3Manufacturing precision
If traditional methods using masks are used to produce replicas of surface relief microstructures, then the replication process can be performed, but manufacturing yield decreases
Solution Approach 1:
By eliminating the mask step, the patent removes potential failure points associated with mask manufacturing defects, mask alignment errors, and mask damage during the process. This results in higher manufacturing yield as the direct contact replication method is more robust and less prone to errors
Solution Approach 2:
The direct copying method from master to replica material ensures high fidelity replication without the intermediate mask step that could introduce defects. This approach improves manufacturing yield by reducing the number of opportunities for errors to occur during the replication process
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 simplifies the replication process, increases manufacturing yield, and allows for cost-effective mass production of optical elements with enhanced optical properties, such as light modulation, diffraction, and scattering, while reducing the number of process steps and production time.
Implementation Method 1
The copied surface relief microstructure is etched into the second material layer
Implementation Method 2
the light is diffracted, refracted or scattered
Implementation Method 3
the light is diffracted, refracted or scattered
Implementation Method 4
The use of isotropic and even more anisotropic scattering effects in OVDs can enhance the optical attractiveness significantly
Data Source
Figure 1.1~1.2
Figure 2~4
Figure 5~5.6
AI summary
The present invention relates to a method for the replication of a patterned surface relief microstructure, comprising the steps of generation of a first layer with a patterned surface relief microstructure, generation of a master, by copying the microstructure of the first layer into a second layer, thereby involving at least one dry or wet etching step, characterized by an additional step, in which the microstructure of the master is brought into contact with a replica material, such that the microstructure of the master is reproduced in the replica. The invention further relates to the elements made as a replica according to the method. The surface relief microstructures are suitable to display images with a positive- negative and/or color image flip. The elements according to the invention are particularly useful for securing documents and articles against counterfeiting and falsification.