Multilayer Body Diffractive Relief Structure Masking
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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 resolution, particularly in demetallization steps, which are costly and limited by adjustment tolerances, and struggle with implementing continuous metallic regions and fine structures.
Innovation Solution
A process involving a replication layer with a diffractive relief structure of high depth-to-width ratio, where a first layer is applied and partially removed based on the structure, acting as a mask for precise registration without additional adjustments, enabling high-resolution production with improved accuracy and resolution, potentially up to 100 times better than conventional demetallization processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If demetallisation is performed in accurate register relationship with embossed diffractive relief structure, then manufacturing precision is improved, but device complexity and cost increase due to additional adjustment steps
Solution Approach 1:
The patent combines the mask layer application step with the embossing step. The mask layer is applied directly to the embossed relief structure in the same processing sequence, eliminating the need for separate adjustment steps. This merging of operations achieves accurate register relationship while reducing process complexity and cost.
Solution Approach 2:
The mask layer is applied preliminarily to the embossed relief structure before subsequent processing steps. This preliminary application ensures that the mask layer is already in the correct position and register relationship with the diffractive relief structure, eliminating the need for later adjustment operations.
2Manufacturing precision
If conventional demetallisation processes are used, then manufacturing precision is limited by adjustment tolerances, but resolution is insufficient for fine structures
Solution Approach 1:
By merging the mask layer application with the embossing process, the patent eliminates the adjustment step that limits resolution. The mask layer is applied directly to the embossed structure, achieving register accuracy limited only by the embossing precision rather than by subsequent adjustment tolerances, thereby enabling production of fine structures with resolution up to 100 times better than conventional processes.
3Manufacturing precision
If continuous metallic regions are implemented, then manufacturing precision is improved, but ease of manufacture decreases due to missing spacers for scraping
Solution Approach 1:
The patent merges the mask layer application with the embossing step, so that the mask layer is applied directly to the embossed relief structure. This eliminates the need for separate spacer elements and scraping operations, enabling continuous metallic regions to be manufactured with high precision while maintaining ease of manufacture through a streamlined 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
The process achieves highly accurate and cost-effective production of multi-layer bodies with fine features, such as lines and dots of less than 5 μm width, suitable for optical components and security elements, offering enhanced protection against copying and forgery.
Implementation Method 1
the first layer is partially removed in a manner determined by the first structure
Data Source
AI summary
There is described a process for the production of a multi-layer body (100) having a partially shaped first layer (3m), wherein it is provided that in the process a diffractive first relief structure (4) with a high depth-to-width ratio of the individual structure elements, in particular with a depth-to-width ratio of >0.3, is shaped in a first region (5) of a replication layer (3) of the multi-layer body (100) and the first layer (3m) is applied to the replication layer (3) in the first region (5) and in a second region (4, 6) in which the relief structure is not shaped in the replication layer (3), with a constant surface density, and the first layer (3m) is partially removed in a manner determined by the first relief structure so that the first layer (3m) is partially removed in the first region (5) or in the second region (4, 6) but not in the second region (4, 6) or in the first region (5) respectively.