Silicate Optical Glass Composition for High Refractive Index

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Solution Overview

Problem

The production of flint glass with a refractive index of 1.89-1.96 and Abbe number of 20-28 in the silicate (borate) glass system is challenging due to higher production costs, environmental impact, and platinum vessel corrosion issues compared to the phosphate system.

Innovation Solution

An optical glass composition comprising 12-30% SiO2, 6-20% Nb2O5, 15-35% TiO2, 15-35% BaO, 1-10% ZrO2, with optional additives like B2O3, WO3, ZnO, Li2O, Na2O, K2O, SrO, CaO, MgO, Ln2O3, and clarifying agents, optimized to achieve the desired refractive index and Abbe number while reducing production costs and environmental load.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If phosphate system glass is used to achieve refractive index of 1.89-1.96 and Abbe number of 20-28, then the optical performance is improved, but the production cost and raw material cost increase

Engineering Contradiction:

Improveoptical performanceVSAvoidproduction cost

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent changes the chemical composition parameters by using silicate (borate) glass system instead of phosphate system, with specific weight percentages of SiO2 (12-30%), Nb2O5 (6-20%), TiO2 (15-35%), BaO (15-35%), and ZrO2 (1-10%) to achieve the target refractive index (1.89-1.96) and Abbe number (20-28) while reducing production costs

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite glass system combining multiple oxide components (silica, niobium oxide, titanium oxide, barium oxide, zirconium oxide, and optional boron oxide) to achieve the desired optical properties without using expensive phosphate system materials

Inventive Principle:

Principle #40Composite materials

2Reliability

If phosphate system glass is used to achieve refractive index of 1.89-1.96 and Abbe number of 20-28, then the optical performance is improved, but the environmental load increases

Engineering Contradiction:

Improveoptical performanceVSAvoidenvironmental load

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent changes the base glass system from phosphate to silicate (borate), using environmentally friendlier materials with specific composition ranges that maintain optical performance while reducing environmental impact during production

Inventive Principle:

Principle #35Parameter changes

3Reliability

If phosphate system glass is used to achieve refractive index of 1.89-1.96 and Abbe number of 20-28, then the optical performance is improved, but the platinum vessel corrosion increases

Engineering Contradiction:

Improveoptical performanceVSAvoidplatinum vessel corrosion

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The patent changes the glass system from phosphate to silicate (borate), which has lower chemical reactivity with platinum vessels during melting and processing, thereby reducing corrosion and eliminating the need for special purification treatments of the vessels

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS20240343634A1Optical glass, glass preform, optical element and optical instrument

Publication Date: 2024.10.17 CDGM OPTICAL GLASS

AI summary

An optical glass, wherein components of the optical glass are represented by weight percentage, including: 12-30% of SiO2; 6-20% of Nb2O5; 15-35% of TiO2; 15-35% of BaO; 1-10% of ZrO2. Through rational component proportion, the optical glass obtains the optical glass with a refractive index of 1.89-1.96 and an Abbe number of 20-28 in silicate (borate) system; the cost for raw material and production of this optical glass is lower, and the environmental load is smaller.