Silicon Watch Component Coating to Prevent Debris Scattering
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Silicon watch components are fragile and prone to breakage, leading to the scattering of debris within the watch movement, which compromises the functionality and cleanliness of the mechanism.
Innovation Solution
A multi-layer coating comprising elastic and more resistant materials is applied to the surface of the watch component, particularly in areas subjected to tensile stress, to prevent debris scattering and enhance structural integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a silicon watch component is manufactured using deep etching technique, then micrometric precision is achieved, but the component becomes fragile with wrinkled sides that weaken mechanical resistance
Solution Approach 1:
The patent applies a multi-layer coating system consisting of elastic material layers (polymer or metal) combined with resistant material layers (oxide or nitride). This composite structure combines the flexibility and stress-absorbing capability of the elastic layers with the hardness and wear resistance of the resistant layers, thereby maintaining manufacturing precision while significantly improving mechanical resistance and reducing fragility.
2Shape
If a silicon watch component is cut from a silicon substrate using deep etching, then the component shape is defined, but surface flatness defects in the form of ripples are generated that weaken mechanical resistance
Solution Approach 1:
The patent employs a multi-layer coating that includes elastic material layers acting as flexible shells surrounding the silicon component. These elastic layers can accommodate surface irregularities and ripple defects without transmitting stress concentrations to the base material, thereby maintaining the defined component shape while preventing the ripple-induced weakening of mechanical resistance.
3Reliability
If a silicon watch component breaks, then the watch movement stops functioning, but a significant amount of silicon debris is scattered within the watch movement
Solution Approach 1:
The multi-layer coating system acts as a containment structure that binds together fragments of the silicon component upon breakage. The elastic material layers provide flexibility to absorb impact energy, while the resistant material layers provide structural integrity to hold fragments together, thereby preventing debris scattering and maintaining watch movement functionality even when the component fails.
4Strength
If a multi-layer coating with elastic and resistant materials is applied to the watch component, then tensile strength is significantly increased, but the device complexity increases
Solution Approach 1:
The patent divides the protective coating into multiple distinct layers with specific functions: elastic material layers for stress absorption and resistant material layers for hardness and wear resistance. This segmentation allows each layer to be optimized independently for its specific function, achieving high tensile strength while keeping the overall structure manageable through functional division rather than a single complex layer.
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 coating significantly increases the tensile strength of the watch component, minimizing debris scattering and optimizing resistance, with an average resistance exceeding 6000 MPa, while maintaining micrometric precision and flexibility.
Implementation Method 1
a multi-layer coating comprising at least two layers of elastic material separated by a layer of material more resistant than the elastic material
Implementation Method 2
Such a coating forms a protective layer for the watch component to prevent the scattering of debris in the event of breakage of the component by holding the different pieces together
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
Watch component based on a brittle material characterized in that it comprises at least a surface part of brittle material covered by a coating (10) comprising at least two CE layers of elastic material (11) separated by a CR layer of material more resistant (12) than the elastic material (11).