Sacrificial-Layer Substrate Decoration for Precise Matt Patterns
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Solution Overview
Problem
Existing methods for decorating substrates, such as watch dials, using laser-induced metallization face challenges in accurately depositing metallization layers, often resulting in unsatisfactory appearances due to over- or under-deposition, and can alter the substrate surface.
Innovation Solution
A method involving the deposition of a sacrificial material layer on the substrate, structuring it to create cavities, and selectively removing it to form a decorative pattern, which enhances the surface with a matt or satin appearance through light reflections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If laser beam etching and metallisation is used to create decorative patterns on substrate, then visual differentiation is achieved, but manufacturing precision deteriorates due to inaccurate metallisation layer deposition
Solution Approach 1:
The patent applies preliminary action by first depositing a sacrificial material layer over the entire substrate surface before creating the decorative pattern. This preliminary layer serves as a template that guides subsequent selective removal processes, ensuring precise pattern definition without requiring accurate metallisation deposition on small etched areas. The sacrificial layer is structured to define the exact boundaries of the decorative pattern before any pattern-specific material is applied.
Solution Approach 2:
The sacrificial material layer acts as an intermediary between the substrate and the final decorative pattern. This intermediate layer allows for precise pattern transfer through selective removal, mediating the transformation from a uniform substrate to a decorated surface without requiring direct precision metallisation on the final pattern areas. The intermediary layer can be selectively removed to reveal the underlying substrate in precise pattern definitions.
2Shape
If laser beam etching is used to create decorative areas on substrate, then visual differentiation is achieved, but the substrate surface is altered
Solution Approach 1:
The patent applies the taking out principle by removing the harmful laser etching step entirely. Instead of etching the substrate surface to create decorative areas, the invention deposits a sacrificial material layer and selectively removes portions of this layer to define the pattern. This extracts the pattern creation process from the substrate itself, preventing substrate alteration while achieving the desired visual differentiation.
Solution Approach 2:
The sacrificial material layer serves as a disposable element that is deposited, structured, and then selectively removed to create the decorative pattern. This temporary layer enables precise pattern definition without permanently altering the substrate. The sacrificial material is consumed in the process, serving its purpose and then being eliminated, leaving no harmful alterations to the final substrate surface.
3Shape
If metallisation layers are deposited over small etched areas, then decorative pattern is formed, but device complexity increases due to difficulty in accurate deposition
Solution Approach 1:
The patent simplifies the process by performing preliminary deposition of a continuous sacrificial material layer over the entire substrate before pattern definition. This preliminary action creates a uniform base that is easier to deposit than precise metallisation on small areas. The subsequent selective removal of this layer defines the pattern without requiring complex precision deposition equipment or techniques.
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, achieving a visually distinct and aesthetically pleasing matt or satin effect by utilizing the sacrificial material layer's cavities to enhance the substrate's appearance.
Implementation Method 1
the sacrificial material layer is deposited at the surface of the substrate by physical vapour deposition
Implementation Method 2
the sacrificial material layer is deposited at the surface of the substrate by chemical vapour deposition
Implementation Method 3
the sacrificial material layer is deposited at the surface of the substrate by electroplating when the substrate is electrically-conductive
Implementation Method 4
the cavities in the sacrificial material layer are created by wet or dry chemical etching, by laser ablation or else by photolithography
Implementation Method 5
enhances the surface with a matt or satin appearance through light reflections
Data Source
AI summary
A method for decorating a substrate which includes the succession of the following steps: provide the substrate; deposit a layer of a sacrificial material over a surface of the substrate; structure the sacrificial material layer so as to create in this sacrificial material layer a plurality of cavities to form a decorative or technical pattern; eliminate the sacrificial material layer except at the location where the pattern is provided.