Precise Substrate Decoration With Sacrificial-Layer Patterning
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Solution Overview
Problem
Existing methods for decorating substrates, such as watch dials, using laser metallization face challenges in precision and alteration of the substrate surface, leading to unsatisfactory results and material waste.
Innovation Solution
A method involving the deposition of a sacrificial material layer on the substrate, structuring it with cavities, and applying additional finishing layers to create a decorative pattern that contrasts visually with the substrate surface through light reflections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If laser beam metallization is used to decorate substrate areas, then visual appearance differentiation is achieved, but manufacturing precision deteriorates due to difficulty in precisely depositing metallization layers on small etched areas
Solution Approach 1:
The patent introduces a sacrificial layer as an intermediary between the substrate and the final decorative pattern. This sacrificial layer is deposited on the substrate, structured to define the pattern, and then removed. The intermediary sacrificial layer enables precise pattern transfer without directly modifying the substrate surface, thus achieving both visual differentiation and manufacturing precision.
Solution Approach 2:
The sacrificial layer is deposited and structured in advance before the final decorative metallization is applied. This preliminary structuring of the sacrificial layer allows precise definition of the pattern areas, which then guides the subsequent metallization process, ensuring accurate deposition only where needed.
2Shape
If laser beam etching is used to create decorative areas on substrate, then pattern formation is achieved, but the substrate surface is altered which leads to unsatisfactory results
Solution Approach 1:
The sacrificial layer serves as a mediator that absorbs the structural modification actions (etching, ablation, or deposition) instead of the substrate itself. The substrate surface remains untouched and unchanged, while the sacrificial layer is structured to create the desired pattern. After pattern transfer, the sacrificial layer is removed, leaving the substrate surface intact.
Solution Approach 2:
The sacrificial layer is a temporary, disposable element used during the manufacturing process. It is deposited, structured to define the pattern, and then completely removed after serving its purpose. This disposable layer enables pattern formation without permanently altering the valuable substrate surface.
3Shape
If metallization layers are deposited on laser etched areas, then decorative effect is achieved, but material waste increases due to discarding substrates with insufficient or excessive coverage
Solution Approach 1:
The sacrificial layer acts as a precise template that defines exactly where metallization should be deposited. This intermediary structure ensures that metallization layers are applied only to the intended areas with precise coverage, eliminating the problems of excessive or insufficient deposition that previously caused substrate rejection and waste.
Solution Approach 2:
The patent replaces the direct mechanical/thermal laser etching and metallization process on the substrate with a chemical or physical vapor deposition process on the sacrificial layer, followed by selective removal. This substitution enables more precise control over material deposition and reduces substrate waste.
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 method allows precise decoration without altering the substrate surface, enabling a matte or satin appearance that clearly distinguishes the pattern from the substrate, overcoming precision and alteration issues.
Implementation Method 1
the layer of sacrificial material is deposited on the surface of the substrate by physical vapor deposition
Implementation Method 2
the layer of sacrificial material is deposited on the surface of the substrate by chemical vapor deposition
Implementation Method 3
the layer of sacrificial material is deposited on the surface of the substrate by electrodeposition when the substrate is electrically conductive
Implementation Method 4
the cavities in the layer of sacrificial material are created by wet or dry chemical etching
Implementation Method 5
the cavities in the layer of sacrificial material are created by wet or dry chemical etching
Implementation Method 6
the cavities in the layer of sacrificial material are created by wet or dry chemical etching, by laser ablation or by photolithography
Data Source
Figure 1~4
Figure 5~8
Figure 9~12
AI summary
The invention relates to a method for decorating a substrate (1) which comprises the following succession of steps: - obtaining the substrate (1); - depositing on a surface of the substrate (1) a layer of sacrificial material (2); - structuring the layer of sacrificial material (2) so as to create in this layer of sacrificial material (2) a plurality of cavities (4) to form a decorative or technical pattern (12); - removing the layer of sacrificial material (2) except where the pattern (12) is intended.