Semitransparent Lens With Matte Finish And Anti-Interference Layer
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Solution Overview
Problem
Semitransparent lenses used in fashion glasses suffer from distortion and a hazy appearance due to internal light reflection, and interference fringes occur when light strikes the lens surface, compromising visual recognition and aesthetic appeal.
Innovation Solution
A semitransparent lens configuration featuring a polycarbonate polarizing sheet with an acrylic resin intermediate layer, a reflection layer with fine irregularities, and a hard-coat layer with a refractive index close to the intermediate layer, which minimizes light scattering and refractive index differences to prevent interference fringes and maintain a matte, ornamental appearance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a reflection layer is formed to cause scattering of light rays in the interior of the semitransparent lenses, then visual recognition is improved, but the exterior appearance becomes distorted and hazy
Solution Approach 1:
The patent applies local quality by creating fine irregularities only on the surface of the reflection layer, rather than throughout the entire layer. This localized surface treatment scatters light to improve visual recognition while maintaining the flatness and optical clarity of the reflection layer's interior, thus preventing distortion and haziness of the exterior appearance.
2Illumination intensity
If the reflection layer is made highly reflective, then ornamentation is improved, but interference fringes occur when light strikes the lens surface
Solution Approach 1:
The patent changes the surface parameter of the reflection layer by introducing fine irregularities with a specific surface roughness (Ra) value. This parameter change modifies how light interacts with the reflection layer surface, reducing specular reflection that causes interference fringes while maintaining sufficient reflectivity for ornamentation through the controlled scattering effect.
3Object-generated harmful factors
If the refractive index difference between layers is reduced, then interference fringes are prevented, but light scattering increases causing haze
Solution Approach 1:
The patent applies local quality by concentrating the light scattering function on the surface irregularities of the reflection layer rather than distributing it through refractive index differences between bulk layers. This localized surface scattering prevents interference fringes by matching refractive indices between layers, while the surface irregularities provide sufficient scattering to maintain clarity and reduce haze.
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 ensures a clear and unobstructed visual field while providing a natural, matte-colored appearance and preventing interference fringes, enhancing both functionality and aesthetics of the lenses.
Implementation Method 1
Semitransparent lenses that reflect part of incident visible light are used in the colored sunglasses
Implementation Method 2
a reflection layer is formed to cause scattering of light rays in the interior of the semitransparent lenses
Implementation Method 3
an incident light ray is refracted by the reflection layer so that the exterior appears distorted
Data Source
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AI summary
An objective of the present disclosure is to ensure a sufficient visual field of the exterior as viewed by a lens wearer, the lens having a highly ornamental matte-colored visual appearance. A semitransparent lens (11) has a lens substrate (12), a reflection layer (13), a hard-coat layer (15), and an intermediate layer (14). A surface of the lens substrate (12) has fine irregularities. The reflection layer (13) is disposed on the lens substrate (14). The hard-coat layer (15) is disposed on the reflection layer (13). The intermediate layer (14) is arranged between the lens substrate (12) and the reflection layer (13), and is formed from a material having a difference in refractive index less than or equal to 0.03 relative to the hard-coat layer (15). Haze value of the semitransparent lens (11) is in a range of 0.4 to 2.5 as measured in accordance with ISO 12312-1 according to the test method of ISO 12317.97.