Far-Infrared Transmission Coating With MgO for Low-Reflection Films
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing far-infrared ray transmission members face challenges in effectively suppressing reflection and require thicker films for adequate antireflection performance, and materials like MgF2 exhibit poor adhesion and limited process flexibility.
Innovation Solution
A far-infrared ray transmission member comprising a base material with a functional film containing MgO as a principal component in a low refractive index layer, with a refractive index ≤1.5 and a content of 50-100% MgO, to suppress reflection and facilitate flexible film formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If fluoride such as MgF2 is used as a low refractive index layer, then the refractive index is reduced to improve antireflection performance, but adhesion to base material or inorganic film deteriorates
Solution Approach 1:
The patent changes the material parameter from fluoride (MgF2) to oxide (MgO), maintaining the low refractive index property while fundamentally improving adhesion characteristics. This material substitution resolves the contradiction by finding an alternative substance that satisfies both optical and adhesive requirements.
Solution Approach 2:
The patent employs composite material structures, specifically forming an antireflection film comprising multiple layers including the oxide-based low refractive index layer. This layered composite approach allows optimization of each layer's properties, achieving both low reflection and good adhesion through the synergistic combination of materials.
2Illumination intensity
If conventional layered films are used for antireflection, then some reflection suppression is achieved, but film thickness must be increased to obtain appropriate antireflection performance
Solution Approach 1:
The patent changes the refractive index parameter of the low refractive index layer to be equal to or smaller than 1.5, which is a more stringent requirement than conventional designs. This parameter optimization, combined with the oxide material selection, enables achieving superior antireflection performance with reduced film thickness compared to conventional layered film structures.
3Illumination intensity
If fluoride-based materials are used, then low refractive index is achieved, but the number of options of forming process on base material is limited
Solution Approach 1:
The patent changes the material class from fluoride to oxide, which fundamentally expands the available forming process options. Oxide materials like MgO can be deposited using various techniques including sputtering, chemical vapor deposition, and atomic layer deposition, providing greater process flexibility and adaptability to different base materials compared to fluoride-based approaches.
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 effectively reduces reflection and allows for the formation of an antireflection film with improved adhesion and process flexibility.
Implementation Method 1
a low refractive index layer containing oxide as a principal component and having a refractive index equal to or smaller than 1.5 with respect to light at a wavelength of 10 μm
Data Source
Figure 1~2
Figure 3
Figure 4
AI summary
To appropriately suppress reflection of far-infrared rays, and appropriately form an antireflection film. A far-infrared ray transmission member (20) includes a base material (30) that transmits far-infrared rays, and a functional film (32) that is formed on the base material (30) and includes a low refractive index layer (34) containing oxide as a principal component and having a refractive index equal to or smaller than 1.5 with respect to light at a wavelength of 10 um. The low refractive index layer (34) contains MgO as a principal component, and a content of MgO is equal to or larger than 50 mass% and equal to or smaller than 100 mass% with respect to the entire low refractive index layer (34).