Optical Glass TiO2 Nb2O5 High Transmittance
Solution Overview
Problem
Existing optical glasses containing TiO2 or Nb2O5 for high refractive index suffer from decreased light transmittance, and prolonged annealing treatments to improve transmittance are costly and time-consuming.
Innovation Solution
An optical glass composition with TiO2 and/or Nb2O5 in specific amounts, stabilized in high valence states, achieves high light transmittance without prolonged annealing, using a glass composition with a basicity of 12 or more and specific mole percentages of components like B2O3, SiO2, and Ln2O3, allowing for reduced thermal treatment duration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If TiO2 or Nb2O5 is contained in the glass to increase refractive index, then the refractive index is improved, but the light transmittance decreases
Solution Approach 1:
The patent changes the chemical parameters of the glass composition by introducing specific components (B2O3 at 10-30%, Ln2O3 at 10-50%, and controlling TiO2 at 8-40% and Nb2O5 at 1-11%) to stabilize Ti and Nb ions in high valence states. This parameter change allows the glass to maintain both high refractive index (1.8-2.3) and high light transmittance (80% or more at 450 nm) without requiring prolonged annealing treatment
2Reliability
If prolonged annealing treatment is applied to increase light transmittance, then the light transmittance is improved, but the production time and cost increase
Solution Approach 1:
The patent performs preliminary action by incorporating specific glass components (B2O3, Ln2O3, TiO2, Nb2O5) during the glass melting and molding process. This preliminary compositional preparation stabilizes Ti and Nb ions in high valence states from the beginning, eliminating the need for subsequent prolonged annealing treatment and achieving high light transmittance directly after standard cooling procedures
Solution Approach 2:
The patent extracts and eliminates the prolonged annealing treatment step from the production process. By formulating the glass composition with specific components that inherently stabilize high valence states, the patent removes the need for the time-consuming annealing process while maintaining high light transmittance properties
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 light transmittance and mass productivity by stabilizing Ti and Nb ions in high valence states, reducing the need for prolonged annealing and maintaining internal transmittance with minimal change, even without extended thermal treatment.
Implementation Method 1
when an optical glass containing TiO2 and/or Nb2O5 as high-refractive index components in a specific amount or more is given a ligand field allowing Ti ions and/or Nb ions in the glass to be stably present in a high valence state, it can easily achieve high light transmittance properties
Data Source
AI summary
Provided is an optical glass that contains TiO2 and/or Nb2O5 as components of a glass composition, achieves a high light transmittance, and has excellent mass productivity. An optical glass contains TiO2 and Nb2O5 in a total amount of 20% by mole or more as components of a glass composition and has a basicity of 12 or more.