Transparent Layered Element with Textured Interfaces
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Solution Overview
Problem
Transparent layered elements with diffuse reflection properties often result in a blurring or 'dirty glazing' effect when the luminous contrast between sides is weak, impairing vision through the element.
Innovation Solution
A transparent layered element with two smooth outer main surfaces made of dielectric materials of substantially the same refractive index, featuring a central layer with textured contact surfaces between metallic and dielectric materials or dielectric materials of different refractive indices, optimizing the reflection ratio between the two outer layers to achieve clear vision without blurring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If diffuse reflection properties are implemented in transparent layered elements, then glare is reduced and privacy is improved, but vision sharpness deteriorates due to blurring or dirty glazing effect
Solution Approach 1:
The patent applies different surface qualities to different regions of the layered element. The outer surfaces are kept smooth for specular transmission to maintain vision sharpness, while internal contact surfaces are textured to provide diffuse reflection for glare reduction and privacy. This local differentiation of surface quality resolves the contradiction between maintaining clear vision and reducing glare.
Solution Approach 2:
The patent creates an asymmetric optical structure where the distribution of textured surfaces is non-uniform throughout the layers. By strategically positioning textured contact surfaces between specific layers with different refractive indices, the element achieves direction-dependent optical properties that favor specular transmission while incorporating diffuse reflection, thus resolving the vision sharpness versus glare reduction contradiction.
2Illumination intensity
If diffuse reflection is enhanced for privacy glazing, then opacity on the brighter side is improved, but transmission clarity deteriorates when luminous contrast is weak
Solution Approach 1:
The patent implements localized texturing at internal contact surfaces between layers of different refractive indices, while maintaining smooth outer surfaces. This local quality differentiation enables the element to provide diffuse reflection for privacy when needed, while preserving specular transmission clarity through the smooth external interfaces, thus resolving the contradiction between opacity control and transmission clarity.
Solution Approach 2:
The patent utilizes changes in refractive index parameters between different layers to control optical behavior. By selecting materials with specific refractive index differences and positioning textured interfaces at these boundaries, the element achieves variable optical properties that maintain transmission clarity while providing privacy opacity control, resolving the contradiction between these two requirements.
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 clear vision through the layered element by adjusting reflection properties, reducing the blurring effect even when light contrast is weak, and maintaining sharpness of vision by favoring specular transmission over reflection on the less luminous side.
Implementation Method 1
all the contact surfaces between two adjacent layers of the layered element which are one of metallic material and the other of dielectric material, or which are two layers of dielectric materials of different refractive indices, are textured
Implementation Method 2
two outer layers, which each have a smooth outer main surface and which are made of dielectric materials having substantially the same refractive index, and a central layer interposed between the outer layers, this central layer being formed either by a single layer of material metal or dielectric material with a refractive index different from that of the outer layers
Implementation Method 3
a transparent layered element with diffuse reflection properties is an element which gives rise to specular transmission and diffuse reflection of radiation incident on the element
Data Source
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AI summary
This transparent element (10) comprises: two outer layers (2, 4), each of which has a smooth outer surface (2A, 4A) and which consist of dielectric materials having substantially the same refractive index (n2, n4), and a central layer (3) inserted between the outer layers, formed either from a single layer made from a metal material or from a dielectric material having a refractive index different to that of the outer layers, or from a stack of layers that comprises at least one layer made from a metal material or from a dielectric material having a refractive index different to that of the outer layers. All the contact surfaces (S0, S1) between two layers of different natures or having different refractive indices are textured and parallel to each other, the ratio of the total reflection (Rutile) of the element (10) on the side of a first outer layer (2) in a given wavelength region to the total reflection (Rparasite) of the element (10) on the side of the second outer layer (4) in said given wavelength region being greater than or equal to 1.5.