Multi-layer Diffractive Relief Structure Demetallization
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Solution Overview
Problem
Existing processes for producing multi-layer bodies with diffractive relief structures face challenges in achieving high accuracy and cost-effectiveness, particularly in demetallization steps where resolution is limited by adjustment tolerances and the process complexity increases with finer structures.
Innovation Solution
A process involving a replication layer with a diffractive relief structure, where a photosensitive layer or mask is exposed differently in regions with and without the relief structure, allowing for accurate removal of a first layer in register relationship, enhancing resolution and reducing costs by eliminating the need for additional adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If demetallization is performed in accurate register relationship using conventional adjustment procedures, then the security feature can be produced with proper alignment, but the process becomes costly and the degree of resolution is limited by adjustment tolerances
Solution Approach 1:
The first layer itself serves as the mask layer for demetallization. By applying the first layer with constant surface density over the entire replication layer and then selectively removing it based on the relief structure, the system eliminates the need for separate mask layers and complex alignment procedures. The first layer automatically provides the masking function where needed while being removable where not needed, based on the underlying relief structure.
Solution Approach 2:
The first layer performs multiple functions: it serves as both the functional layer (e.g., reflective layer) and as the mask layer for selective removal. This multi-functionality eliminates the need for separate mask layers and reduces process complexity while maintaining high registration accuracy, as the same layer that needs to be positioned is also the layer used for masking during demetallization.
2Manufacturing precision
If demetallization is performed in accurate register relationship using conventional adjustment procedures, then the security feature can be produced with proper alignment, but the production cost increases
Solution Approach 1:
The first layer itself serves as the mask layer for demetallization. By applying the first layer with constant surface density over the entire replication layer and then selectively removing it based on the relief structure, the system eliminates the need for separate mask layers and complex alignment procedures. The first layer automatically provides the masking function where needed while being removable where not needed, based on the underlying relief structure.
Solution Approach 2:
The invention extracts and eliminates the separate mask layer and complex adjustment procedures from the conventional demetallization process. By using the first layer itself as the mask and applying it with constant surface density over the entire replication layer, the process removes unnecessary steps and reduces production cost while maintaining high registration accuracy.
3Ease of manufacture
If conventional demetallization methods are used, then the process can be implemented with standard procedures, but the resolution is limited and cannot achieve finer structures
Solution Approach 1:
The invention replaces mechanical adjustment procedures with an optical exposure system. By using UV irradiation through the first layer and relief structure to selectively remove the first layer, the process achieves high resolution (line widths as low as 200 nm) without relying on mechanical alignment tolerances. The optical exposure system naturally provides the precision needed for fine structures.
Solution Approach 2:
The invention changes the parameter of surface density distribution by applying the first layer with constant surface density over the entire replication layer, rather than attempting to apply it with varying density to match the relief structure. This parameter change simplifies the application process while the subsequent selective removal based on UV exposure through the relief structure achieves the desired high resolution.
4Manufacturing precision
If the first layer is applied with varying surface density to match the relief structure, then the mask function can be achieved, but the application process becomes more complex
Solution Approach 1:
The first layer itself serves as the mask layer for demetallization. By applying the first layer with constant surface density over the entire replication layer and then selectively removing it based on the relief structure, the system eliminates the need for separate mask layers and complex alignment procedures. The first layer automatically provides the masking function where needed while being removable where not needed, based on the underlying relief structure.
Solution Approach 2:
The invention changes the parameter of surface density distribution by applying the first layer with constant surface density over the entire replication layer, rather than attempting to apply it with varying density to match the relief structure. This parameter change simplifies the application process while the subsequent selective removal based on UV exposure through the relief structure achieves the desired high resolution.
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 process achieves a resolution improvement by a factor of 100 compared to conventional demetallization methods, enabling the production of security features with finer details and improved resistance to copying, with line widths as low as 200 nm, and allows for the creation of complex, high-security multi-layer bodies suitable for optical components and telecommunications.
Implementation Method 1
the photosensitive layer or the washing mask is exposed through the first layer so that the photosensitive layer or washing mask is exposed differently due to the first relief structure in the first and in the second regions
Data Source
AI summary
There are described a process for the production of a multi-layer body (100) having a partially shaped first layer (3m) and a multi-layer body produced in that way. It is provided that a diffractive first relief structure (4) is shaped in a first region of a replication layer (3) of the multi-layer body, that the first layer (3m) is applied to the replication layer (3) in the first region and in a second region in which the relief structure is not shaped in the replication layer (3), that a photosensitive layer is applied to the first layer (3m) or a photosensitive washing mask is applied thereto as a replication layer, that the photosensitive layer or the washing mask is exposed through the first layer (3m) so that the photosensitive layer or washing mask is exposed differently due to the first relief structure in the first and in the second regions, and that the first layer (3m) is removed using the exposed photosensitive layer or washing mask as a mask layer in the first region but not in the second region or in the second region but not in the first region.