Optical Glass High Refractive Index Low Specific Gravity
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Solution Overview
Problem
There is a demand for optical glass with a high refractive index and low specific gravity suitable for use in augmented reality devices, as existing high-refractive-index optical glasses have specific gravities that are too high for such applications.
Innovation Solution
The development of optical glass with a refractive index of 1.900 or more, an Abbe number of 25.0 or less, containing specific amounts of P2O5, Bi2O3, TiO2, and other oxides, optimized in mass ratios to achieve a high refractive index while maintaining a relatively low specific gravity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If optical glass containing Ti and Nb is used to achieve high refractive index, then the refractive index increases, but the specific gravity becomes too large
Solution Approach 1:
The patent changes the chemical composition parameters of the optical glass by specifying precise ranges for P2O5 (4-15 mass%), Bi2O3 (10-20 mass%), TiO2 (5-15 mass%), and other oxides. This parameter optimization allows achieving high refractive index (1.85 or more) while controlling specific gravity to be 4.7 or less, resolving the contradiction between refractive index and specific gravity
Solution Approach 2:
The patent creates a composite glass material system combining multiple oxide components (P2O5, Bi2O3, TiO2, SiO2, B2O3, Al2O3, etc.) in specific proportions. This composite approach allows the material to achieve both high refractive index and low specific gravity by synergistic interaction of different oxide components, rather than relying on a single component
Data Source
AI summary
Provided is optical glass in which a refractive index nd is 1.900 or more, an Abbe number vd is 25.0 or less, an amount of P2O5 is 5.0 mass % or more, an amount of Bi2O3 is 20.0 mass % or less, an amount of TiO2 is 0.1 mass % or more, a mass ratio [TiO2/(Li2O+Na2O+K2O)] between the amount of TiO2, and a total amount of Li2O, Na2O, and K2O [Li2O+Na2O+K2O] is 2.5 to 10.0, a mass ratio [TiO2/(MgO+CaO+ZnO+SrO+BaO)] between the amount of TiO2 and a total amount of MgO, CaO, ZnO, SrO, and BaO [MgO+CaO+ZnO+SrO+BaO] is 1.25 to 10.0, and a mass ratio [(Li2O+Na2O+MgO+CaO+ZnO+SrO)/(K2O+BaO)] between a total amount of Li2O, Na2O, MgO, CaO, ZnO, and SrO [Li2O+Na2O+MgO+CaO+ZnO+SrO] and a total amount of K2O and BaO [K2O+BaO] is 0.8 or less.