Optical Glass Refractive Index Stability
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Solution Overview
Problem
Existing optical glasses for wearable and mobile device applications often have high refractive indices, which require high proportions of components like TiO2 or Nb2O5, leading to unstable vitrification and increased risk of cracking or chipping during manufacturing.
Innovation Solution
An optical glass with a refractive index in the range of 1.45000 to 1.65000, a low ISO color contribution index, and a specific mechanical property S value of 0.70×10^6 to 1.03×10^6 Pa/°C, ensuring excellent formability, stability, and color correction abilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the refractive index is increased to meet wearable application requirements, then the optical performance is improved, but the vitrification stability deteriorates and the risk of cracking or chipping increases
Solution Approach 1:
The patent applies parameter changes by precisely controlling the refractive index within the range of 1.45000 to 1.65000 and the S value within 0.70×10^6 to 1.03×10^6 Pa/°C, transforming the approach from maximizing refractive index to optimizing it within a specific range to achieve both optical performance and manufacturing stability
Solution Approach 2:
The patent uses composite materials by combining multiple oxide components (SiO2, B2O3, Al2O3, TiO2, Nb2O5, La2O3, etc.) in specific proportions to create a glass composition that achieves the desired refractive index while maintaining vitrification stability and reducing cracking risk
2Manufacturing precision
If many manufacturing steps are involved to produce optical elements, then the optical properties can be adjusted, but the inherent properties of the optical glass change and the element becomes prone to cracking or chipping
Solution Approach 1:
The patent applies preliminary action by optimizing the glass composition and mechanical properties (S value) before the manufacturing process, so that the glass inherently possesses excellent formability and stability, reducing the need for extensive post-processing steps that could cause cracking or chipping
Data Source
AI summary
There is provided an optical glass, in which a refractive index (nd) at a wavelength of the d line of helium (587.6 nm) is in a range of 1.45000 to 1.65000; an ISO color contribution index ISO/CCI is 0.00 for blue (B), 0.80 or less for green (G), and 0.80 or less for red (R); and an S value is 0.70×106 or more and less than 1.03×106 (Pa/° C.), the S value being obtained by the equation: S=E·α/(1−ν), in which E is Young's modulus (unit: GPa); α is an average coefficient of linear expansion in a temperature range of 100° C. to 300° C. (unit: 10−7° C.−1); and ν is Poisson's ratio.