Chemically Strengthened Optical Glass for AR/VR Impact Resistance
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Solution Overview
Problem
Conventional optical glasses lack the necessary impact resistance and hardness to withstand harsh environments while maintaining a high refractive index and Abbe number required for applications in AR/VR devices and vehicle-mounted cameras.
Innovation Solution
Chemically strengthened optical glass with a compressive stress layer, comprising 20.0 to 50.0% SiO2, 10.0 to 45.0% TiO2, and 0.1 to 20.0% Na2O, achieving a refractive index of 1.65 to 1.85 and impact resistance of 8 cm or more, as determined by a sandpaper falling ball test.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional optical glass composition is used, then refractive index and Abbe number can be maintained, but impact resistance and hardness are insufficient
Solution Approach 1:
The patent applies parameter changes by modifying the chemical composition parameters of the glass, specifically setting SiO2 content to 20-50 mass%, TiO2 content to 10-45 mass%, and Na2O content to 0.1-20 mass%. This compositional parameter optimization enables the glass to achieve both high refractive index (1.65-1.85) and improved impact resistance (8 cm or more in sandpaper falling ball test), resolving the contradiction between optical performance and mechanical strength
Solution Approach 2:
The patent creates a composite glass material by combining multiple oxide components in specific proportions. The synergistic combination of SiO2 (providing network structure), TiO2 (enhancing refractive index and hardness), and Na2O (improving chemical durability and enabling chemical strengthening) forms a composite material that simultaneously achieves high optical performance and enhanced mechanical properties including impact resistance and surface hardness
2Length of moving object
If glass thickness is decreased to reduce device size, then device dimensions are reduced, but impact resistance deteriorates
Solution Approach 1:
The patent changes the material parameters by optimizing the glass composition to include 20-50 mass% SiO2, 10-45 mass% TiO2, and 0.1-20 mass% Na2O, achieving a refractive index of 1.65-1.85 and impact resistance of 8 cm or more. This enables the use of thinner glass while maintaining sufficient impact resistance for wearable applications
Solution Approach 2:
The patent replaces the mechanical approach of increasing glass thickness to improve impact resistance with a chemical approach. By modifying the chemical composition (adding TiO2 for hardness and Na2O for chemical strengthening capability) and applying chemical strengthening treatment to create a compressive stress layer, the glass achieves high impact resistance even at reduced thickness, thus substituting mechanical thickening with chemical strengthening
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 chemically strengthened optical glass exhibits high hardness and improved impact resistance while maintaining a high refractive index and Abbe number, suitable for use in harsh environments such as AR/VR devices and vehicle-mounted cameras.
Implementation Method 1
chemically strengthened optical glass including a compressive stress layer on a surface
Implementation Method 2
the chemically strengthened optical glass has a refractive index (nd) of 1.65 to 1.85
Data Source
AI summary
Provided is a chemically strengthened optical glass having an improved impact resistance and a high hardness while maintaining the refractive index, the Abbe number and the transmittance required in the conventional optical glasses. The chemically strengthened optical glass has a compressive stress layer on the surface thereof, contains, in mass % in terms of oxide, 20.0-50.0% of an SiO2 component, 10.0-45.0% of a TiO2 component and 0.1-20.0% of an Na2O component, has a refractive index (nd) of 1.65-1.85, and is characterized by having an impact resistance of 8 cm or more in a sandpaper falling ball test in which a 16.0 g SUS ball is dropped thereon.