Eyeglass Lens Coating Geometry for Stray Light Suppression
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Solution Overview
Problem
The formation of a conventional coating film on an eyeglass lens with a minute convex portion can deteriorate the effectiveness of near-sightedness suppression.
Innovation Solution
The eyeglass lens is designed with a coating film that includes coating film convex portions originating from base material convex portions, ensuring a gradual change in shape to minimize stray light rays, with a ratio of stray light rays less than 30% of the total rays, and a specific relationship between the protruding lengths of the coating and base material convex portions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional coating film is formed on the object-side surface with minute convex portions, then the lens surface can be protected and have improved optical properties, but the near-sightedness suppression function deteriorates due to excessive stray light
Solution Approach 1:
The invention changes the shape parameters of the convex portions by defining specific relationships between the base material convex portions and coating film convex portions. By controlling the protruding lengths and base diameters according to specific formulas, the optical properties are optimized to reduce stray light while maintaining coating protection.
Solution Approach 2:
The invention applies different properties to different parts of the convex portions. The base material convex portions have spherical shapes with specific dimensions, while the coating film convex portions have controlled protruding lengths that create gradual shape changes. This local differentiation optimizes light focusing while reducing stray light generation.
2Object-generated harmful factors
If the shape of the coating film surface changes gradually to reduce stray light, then near-sightedness suppression is improved, but the coating film structure becomes more complex
Solution Approach 1:
The invention performs preliminary design of the convex portion shapes before coating formation. By pre-defining the base material convex portion dimensions and predicting the coating film convex portion characteristics, the optimal shape is established in advance, simplifying the actual manufacturing process while achieving the desired gradual shape change.
Solution Approach 2:
The invention uses specific parameter relationships (formulas relating protruding lengths and base diameters) to control the shape complexity. By mathematically defining the geometry parameters, the gradual shape change is achieved through controlled parameter variations rather than complex structural designs.
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 lens effectively suppresses near-sightedness by ensuring that a majority of rays converge at the intended position, reducing stray light rays to less than 30% and maintaining the near-sightedness suppression effect even after the coating film is applied.
Implementation Method 1
rays that are incident on the eyeglass lens are focused at a position B closer to the object than the predetermined position A
Implementation Method 2
Because the base material convex portion has a spherical shape, rays are focused at the position B that is closer to the object
Data Source
AI summary
Provided is an eyeglass lens configured to cause rays that have entered from an object-side surface to be emitted from an eyeball-side surface and cause the emitted rays to converge at a predetermined position A. The eyeglass lens includes a lens base material having a plurality of base material convex portions on at least one of the object-side surface and the eyeball-side surface, and the eyeglass lens has a configuration for suppressing stray light rays that do not pass through the vicinity of the predetermined position A or the vicinity of the position B that is closer to the object than the predetermined position A is.