High-Index Glass Composition With Lower Density and Crystallization Resistance

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Solution Overview

Problem

Existing glasses lack the combination of high refractive index (above 2.1) and low density (below 5.25 g/cm3) while also being resistant to crystallization, which is crucial for augmented reality applications requiring good optical representation, digital information superimposition, and wearing comfort.

Innovation Solution

A glass composition comprising specific constituent phases such as lanthanum titanate, lanthanum niobate, lanthanum molybdenum borate, lanthanum borate, yttrium borate, gadolinium borate, zirconium silicate, diboron trioxide, and silicon dioxide, calculated using formulas to achieve desired refractive index and density values.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Illumination intensity

If glasses with high refractive index (above 2.1) are used, then optical performance is improved, but density increases (above 5.25 g/cm3) and crystallization tendency increases

Engineering Contradiction:

Improverefractive indexVSAvoiddensity

Core Design Contradiction:

Illumination intensityVSWeight of moving object

Solution Approach 1:

The patent changes the chemical composition parameters by incorporating specific combinations of oxides (Bi2O3, TiO2, Nb2O5, MoO3, B2O3, SiO2, P2O5) in controlled proportions to achieve high refractive index while maintaining low density and preventing crystallization

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite glass system combining multiple oxide components that work synergistically: Bi2O3 and TiO2 provide high refractive index, while B2O3 and SiO2 maintain glass structure and prevent crystallization, achieving a balance between optical performance and physical properties

Inventive Principle:

Principle #40Composite materials

2Illumination intensity

If glasses with high refractive index (above 2.1) are used, then optical performance is improved, but tendency to crystallization increases

Engineering Contradiction:

Improverefractive indexVSAvoidcrystallization resistance

Core Design Contradiction:

Illumination intensityVSStability of the object's composition

Solution Approach 1:

The patent adjusts compositional parameters within specific ranges (Bi2O3: 20-60%, TiO2: 10-40%, Nb2O5: 5-30%, MoO3: 5-30%, B2O3: 10-40%, SiO2: 5-20%, P2O5: 1-10%) to optimize the balance between refractive index and crystallization resistance

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent uses B2O3 and SiO2 as intermediary components that stabilize the glass structure and prevent crystallization of the high-refractive-index Bi2O3-TiO2-Nb2O5-MoO3 system, acting as network formers that maintain amorphous structure

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS12570567B2Glasses with high refractive power and low density

Publication Date: 2026.03.10 SCHOTT AG

AI summary

A glass includes a composition characterized by the following constituent phases (in mol-%): 20-80 lanthanum titanate; 10-50 lanthanum niobate; 0-60 lanthanum molybdenum borate; 2-40 lanthanum borate; 2-40 yttrium borate; 0-40 gadolinium borate; 2-40 zirconium silicate; 2-40 diboron trioxide; and 0-20 silicon dioxide. A refractive index is at least 2.00.