Diffuse Reflective Glass Lens Coating for Matte Mirror Haze Control
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Solution Overview
Problem
Existing sunglasses with mirror finishes require complex manufacturing processes that can affect mechanical and cosmetic properties, and do not provide optimal matte reflection and haze values for wearer comfort.
Innovation Solution
A diffuse reflective optical article with a textured glass base element and a multilayer interferential coating, featuring specific roughness and refractive index layers, to achieve a matte mirror effect with controlled haze values and color parameters, manufactured through a process that includes roughing, lapping, and chemical hardening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a standard mirror glass lens manufacturing process is used, then a reflective coating is achieved, but the manufacturing process is complex and affects mechanical and cosmetic properties
Solution Approach 1:
The patent changes the surface topology parameter of the glass substrate by creating a micro-textured rough surface through controlled etching or sandblasting. This surface modification enables diffuse reflection without requiring complex multilayer interference coatings, thereby simplifying the manufacturing process while maintaining the reflective effect.
Solution Approach 2:
The patent replaces expensive, complex multilayer interference coatings with a simpler single-layer reflective coating applied on a micro-textured surface. This substitution reduces manufacturing complexity and cost while achieving the desired optical effect through the combination of surface texture and simple coating.
2Illumination intensity
If a textured surface is created on the glass base element, then a matte mirror effect is achieved, but the haze value increases which may affect wearer comfort
Solution Approach 1:
The patent optimizes the surface texture parameters by controlling the roughness amplitude and wavelength within specific ranges. This parameter optimization achieves the matte mirror effect while limiting haze values to below 2.0, balancing aesthetic appearance with wearer comfort and visual clarity.
Solution Approach 2:
The patent applies different surface treatments to different regions or aspects of the lens. The front surface receives micro-texturing for matte reflection, while the rear surface remains smooth for optimal optical transmission. This localized quality differentiation allows the lens to simultaneously achieve aesthetic matte effect and optical performance.
3Illumination intensity
If the rear surface of the front glass base element is used for the reflective coating, then the matte effect is achieved, but the coating process becomes more difficult
Solution Approach 1:
Instead of coating the front surface and then texturing, or texturing and then coating the difficult-to-reach rear surface, the patent inverts the sequence and logic: it textures the rear surface first to create the reflective pattern, then applies a simple protective or enhancing coating. This inversion makes the coating process easier while achieving the matte effect from the front.
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 solution provides a matte mirror effect with optimal haze values (1.1-1.9) and specific colors, ensuring comfort and aesthetic appeal while maintaining mechanical performance and industrial feasibility.
Implementation Method 1
the rear surface (11) of the front glass base element (1) is textured and rough, the reflective coating (30) takes the form of the textured and rough rear surface (11) and is configured for reflecting light in a diffuse manner
Implementation Method 2
a multilayered reflective coating (30) deposited on the rear surface (11) of the front glass base element (1)
Data Source
Figure 1
Figure 2
AI summary
The present invention relates to a diffuse reflective optical article, in particular to an diffuse reflecting glass lens. Furthermore, the present invention also relates to a method for manufacturing the aforementioned optical article.