Optical Component Coating Rounding Sharp Edges
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Solution Overview
Problem
Coating optical components with sharp-edged structures is challenging due to issues like coating material accumulation or thinning at sharp edges, leading to cracks, delamination, and inhomogeneous layer thickness, which affects durability and optical properties.
Innovation Solution
Rounding sharp-edged structures with a flowable film to create a meniscus that increases the radius of curvature, allowing for uniform coating application and reducing the risk of cracks and delamination, using lacquers with high solids content and flexibility for effective solidification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If coating is applied directly to sharp-edged structures, then complete component coating is achieved, but coating material accumulation or thinning occurs at edges leading to cracks and delamination
Solution Approach 1:
The sharp-edged structure is pre-rounded using a flowable film before the actual coating process. This preliminary action modifies the surface geometry to prevent coating defects, allowing uniform coating application without accumulation or thinning at edges, thereby ensuring both complete coverage and coating durability.
Solution Approach 2:
The invention applies curvature to sharp edges by forming a flowable film that rounds the edges. This curvature transformation eliminates the geometric discontinuities that cause coating material accumulation or thinning, enabling uniform coating thickness across the entire component including edge regions.
2Object-affected harmful factors
If sharp edges are maintained for functional reasons, then stray light prevention is achieved, but coating application becomes problematic due to surface tension effects
Solution Approach 1:
The flowable film is applied and rounded before the functional coating process. This preliminary rounding action preserves the sharp edge's functional ability to control stray light while eliminating the manufacturing difficulty of coating sharp edges directly, as the rounded surface allows uniform coating application.
Solution Approach 2:
The flowable film acts as an intermediary layer that modifies the sharp edge geometry. This intermediary structure maintains the edge's functional properties for stray light control while providing a rounded surface that is easy to coat uniformly, thus bridging the gap between functional requirements and manufacturing ease.
3Manufacturing precision
If coating thickness is increased at sharp edges to prevent thinning, then edge coverage is improved, but stress buildup causes coating peeling and delamination
Solution Approach 1:
By rounding sharp edges with a flowable film, the invention eliminates the geometric features that cause coating material to flow away or accumulate. This curvature ensures uniform coating thickness distribution, preventing both thinning and excessive buildup, thereby maintaining coating adhesion strength without peeling or delamination.
Solution Approach 2:
The invention changes the geometric parameter of the edge from sharp (zero or near-zero radius of curvature) to rounded (finite radius of curvature). This parameter change fundamentally alters how coating material distributes on the surface, ensuring uniform thickness that prevents stress buildup and maintains coating adhesion.
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
Ensures a uniform coating thickness and prevents issues like crack formation and delamination, enhancing the durability and optical properties of coated optical components.
Implementation Method 1
an accumulation of coating material may occur in the region of the edge or corner because of the surface tension
Implementation Method 2
The solidifying of the flowable film itself may be performed by drying the film, that is to say by evaporation of liquid film constituents
Implementation Method 3
by curing the film, that is to say by crosslinking of polymer constituents of the film
Data Source
AI summary
Methods for coating an optical component with a sharp-edged structure and an optical component are provided. In a variant of the method, the sharp-edged structure in the optical component is rounded in that a lacquer that forms a lacquer meniscus is applied to the sharp-edged structure and subsequently solidified, the lacquer meniscus forming the rounding after the lacquer has solidified. After the rounding, a coating is applied to the optical component, the coating being applied at least to the lacquer meniscus.