Optical Glass with Controlled Heat Ray Absorption for Meltability
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Solution Overview
Problem
Optical glasses used in wearable equipment and imaging applications face challenges in achieving high refractive index and light transmittance while maintaining good meltability during continuous melting processes, often resulting in colored glass due to high heat ray absorption.
Innovation Solution
An optical glass with a refractive index of 1.64 or more, characterized by a P value between 7.0 and 10.0, calculated using specific absorbance and radiance values at 450, 550, 650, and 750 nm wavelengths, ensuring high internal transmittance and balanced heat ray absorption properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the heat ray absorption property is increased to enhance meltability in continuous melting, then the glass can be efficiently melted, but the glass becomes colored and light transmittance deteriorates
Solution Approach 1:
The patent applies parameter changes by precisely controlling the content of heat ray absorption components (Fe2O3: 5-50 ppm, Cr2O3: 1-20 ppm, NiO: 1-30 ppm, Pt: 1-50 ppm) to optimize the balance between meltability and coloration. By adjusting these compositional parameters within specific ranges, the glass achieves sufficient heat absorption for efficient melting while maintaining high light transmittance and minimal coloration.
2Illumination intensity
If the refractive index is increased to achieve wide-angle imaging and enhanced light guide properties, then the imaging performance is improved, but the light transmittance and color purity are reduced
Solution Approach 1:
The patent achieves high refractive index (nd: 1.60-1.85) while maintaining high light transmittance by precisely controlling multiple compositional parameters simultaneously. The specific ranges of Fe2O3 (5-50 ppm), Cr2O3 (1-20 ppm), NiO (1-30 ppm), and Pt (1-50 ppm) are optimized to balance refractive index enhancement with minimal coloration, allowing the glass to provide both wide-angle imaging capability and high light guide properties without significant coloration.
3Object-generated harmful factors
If the glass is designed with high light transmittance and low impurity content, then the optical quality is improved, but the heat ray absorption property is reduced leading to poor meltability
Solution Approach 1:
The patent resolves this contradiction by introducing specific heat ray absorption components (Fe2O3, Cr2O3, NiO, Pt) at precisely controlled low concentrations (5-50 ppm for Fe2O3, 1-20 ppm for Cr2O3, 1-30 ppm for NiO, 1-50 ppm for Pt). These controlled additions provide sufficient heat absorption for efficient continuous melting while maintaining high light transmittance and minimal impact on optical quality.
Solution Approach 2:
The patent creates a composite glass system that combines high-purity base glass with trace amounts of heat ray absorption components. This composite approach allows the glass to simultaneously exhibit high light transmittance characteristics of pure glass and improved meltability characteristics provided by the controlled addition of Fe2O3, Cr2O3, NiO, and Pt.
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 solution provides optical glasses with high refractive index and light transmittance, enhancing production efficiency and meltability, while minimizing coloration and weight, making them suitable for wearable equipment and imaging applications.
Implementation Method 1
glass is caused to absorb heat rays (infrared light, visible light) from a burner and thereby heated and melted
Implementation Method 2
all of internal transmittances in terms of a 10-mm thickness at wavelengths of 450 nm, 550 nm, 650 nm and 750 nm are 91% or more
Data Source
AI summary
An optical glass has a refractive index (nd) of 1.64 or more. A P value represented by the following formula (1) is in a range of 7.0<P value<10.0: P value=log(A450×P450+A550×P550+A650×P650+A750×P750) (1). A450, A550, A650 and A750 are absorbances of the optical glass with a plate thickness of 10 mm at a wavelength of 450 nm, 550 nm, 650 nm and 750 nm, respectively. P450, P550, P650 and P750 are radiances of light having a wavelength of 450 nm, 550 nm, 650 nm and 750 nm, respectively, at 1,300° C. according to Planck's radiation law. All of internal transmittances in terms of a 10-mm thickness at wavelengths of 450 nm, 550 nm, 650 nm and 750 nm are 91% or more.