Optical Glass Composition for High Refractive Index at Low Density
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Solution Overview
Problem
Existing optical glasses with high refractive index and high dispersion have high density, which hinders the development of lightweight optical instruments and increases battery power demand.
Innovation Solution
An optical glass composition comprising specific weight percentages of P2O5, Nb2O5, TiO2, Na2O, and other components, optimized to achieve a refractive index of 1.89-1.95 and Abbe number of 15-22, with a density of 3.80 g/cm3 or less, through controlled ratios of these components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If optical glass with high refractive index and high dispersion is used, then the imaging field of view is enlarged and optical performance is improved, but the density increases significantly
Solution Approach 1:
The patent changes the chemical composition parameters of the optical glass by specifying precise weight percentages for P2O5 (20-34%), Nb2O5 (38-53%), TiO2 (8-22%), and other components. This parameter optimization allows achieving the target refractive index of 1.89-1.95 and Abbe number of 15-22 while controlling density to 3.80 g/cm³ or less, resolving the contradiction between high optical performance and high density
Solution Approach 2:
The patent creates a composite optical glass material combining multiple oxide components (P2O5, Nb2O5, TiO2, Na2O, K2O, BaO, and optional additives) in specific proportions. This composite approach enables simultaneous achievement of high refractive index, high dispersion, and controlled density, overcoming the limitations of single-component or conventional multi-component glasses
2Illumination intensity
If optical glass with high density is used, then the refractive index can be increased, but the weight of optical instruments increases and battery power demand increases
Solution Approach 1:
The patent optimizes the density parameter to 3.80 g/cm³ or less while maintaining refractive index of 1.89-1.95, directly reducing the weight of optical components and consequently the battery power demand in AR glasses and other optical instruments
3Device complexity
If the number of optical elements is reduced, then the device complexity is decreased, but the imaging field of view may be compromised
Solution Approach 1:
The patent provides optical glass with optimized parameters (refractive index 1.89-1.95, Abbe number 15-22, density ≤3.80 g/cm³) that enable achieving larger imaging field of view with fewer optical elements, as the high refractive index allows for stronger light bending capability
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 optical glass achieves high refractive index and low density, facilitating lightweight optical instruments and reducing battery power requirements.
Implementation Method 1
a larger field of view requires a glass substrate with a higher refractive index. Therefore, the glass substrate with high refractive index is particularly critical
Implementation Method 2
total reflection is the key to ensure no loss or leakage of light during transmission; that is, the light reflects back and forth within the waveguide without transmitting outward
Data Source
AI summary
An optical glass, wherein components thereof are represented by weight percentage, including: 20-34% of P2O5; 38-53% of Nb2O5; 8-22% of TiO2; 1-12% of Na2O; 0-10% of K2O; 0-8% of BaO. Through rational component design, the optical glass of the present invention exhibits high refractive index while having low density, which is conducive to achieving the lightweight feature of optical instruments.