Optical Glass Composition for High Dispersion and Low Specific Gravity

Solution Overview

Problem

Existing optical glasses face challenges in achieving high dispersion while maintaining low specific gravity and refractive index, often leading to reduced transmittance and increased specific gravity when attempting to increase TiO2 and Nb2O5 content, and excessive SiO2 content degrades devitrification resistance.

Innovation Solution

An optical glass composition with specific ranges of SiO2 (0-5%), P2O5 (10-40%), B2O3 (4-30%), Na2O (0-11%), K2O (5-20%), TiO2 (0-20%), ZrO2 (0-2%), and Nb2O5 (20-70%) is developed, optimizing the ratios of these components to achieve high dispersion and low specific gravity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Illumination intensity

If TiO2 and Nb2O5 content is increased to achieve high dispersion, then refractive index is improved, but specific gravity increases and transmittance decreases

Engineering Contradiction:

Improverefractive indexVSAvoidspecific gravity

Core Design Contradiction:

Illumination intensityVSWeight of moving object

Solution Approach 1:

The patent optimizes the compositional parameters by precisely controlling the ratios of TiO2 (0-20%), Nb2O5 (20-70%), and P2O5 (10-40%) to achieve the desired refractive index while minimizing specific gravity. The specific ratios specified in the claims represent the optimized parameter ranges that resolve this contradiction.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite glass material combining multiple oxide components (P2O5, B2O3, TiO2, Nb2O5, SiO2, Al2O3) in specific proportions. This composite approach allows the material to achieve high refractive index through TiO2 and Nb2O5 while the P2O5 and B2O3 matrix maintains lower specific gravity and improves overall optical properties.

Inventive Principle:

Principle #40Composite materials

2Illumination intensity

If TiO2 and Nb2O5 content is increased to achieve high dispersion, then refractive index is improved, but transmittance decreases

Engineering Contradiction:

Improverefractive indexVSAvoidtransmittance

Core Design Contradiction:

Illumination intensityVSObject-affected harmful factors

Solution Approach 1:

The patent optimizes the compositional parameters by precisely controlling the ratios of TiO2 (0-20%), Nb2O5 (20-70%), and P2O5 (10-40%) to achieve the desired refractive index while minimizing specific gravity. The specific ratios specified in the claims represent the optimized parameter ranges that resolve this contradiction.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite glass material combining multiple oxide components (P2O5, B2O3, TiO2, Nb2O5, SiO2, Al2O3) in specific proportions. This composite approach allows the material to achieve high refractive index through TiO2 and Nb2O5 while the P2O5 and B2O3 matrix maintains lower specific gravity and improves overall optical properties.

Inventive Principle:

Principle #40Composite materials

3Stability of the object's composition

If SiO2 content is increased to improve glass stability, then devitrification resistance is improved, but dispersion performance deteriorates

Engineering Contradiction:

Improvedevitrification resistanceVSAvoiddispersion

Core Design Contradiction:

Stability of the object's compositionVSIllumination intensity

Solution Approach 1:

The patent optimizes the compositional parameters by precisely controlling the ratios of TiO2 (0-20%), Nb2O5 (20-70%), and P2O5 (10-40%) to achieve the desired refractive index while minimizing specific gravity. The specific ratios specified in the claims represent the optimized parameter ranges that resolve this contradiction.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite glass material combining multiple oxide components (P2O5, B2O3, TiO2, Nb2O5, SiO2, Al2O3) in specific proportions. This composite approach allows the material to achieve high refractive index through TiO2 and Nb2O5 while the P2O5 and B2O3 matrix maintains lower specific gravity and improves overall optical properties.

Inventive Principle:

Principle #40Composite materials

Data Source

PatentUS20200115271A1Optical glass, and optical element, optical system, cemented lens, interchangeable camera lens, and optical device using same

Publication Date: 2020.04.16 HIKARI GLASS

AI summary

Provide is an optical glass including: by mass %, 0% to 5% of a SiO2 component; 10% to 40% of a P2O5 component; 4% to 30% of a B2O3 component; 0% to 11% of a Na2O component; 5% to 20% of a K2O component; 0% to 20% of a TiO2 component; 0% to 2% of a ZrO2 component; and 20% to 70% of a Nb2O5 component, wherein P2O5 component+B2O3 component is more than 25% and 41% or less, B2O3 component/P2O5 component is 0.15 or more and less than 1.23, TiO2 component/P2O5 component is 0 or more and less than 1.3, and Nb2O5 component/P2O5 component is from 0.7 to 2.8.