Abstract: The present invention relates to an optical glass having refractive index of 1.55 or more and having chromaticity b* that satisfies b*?4.8 under A light source in a CIELab representation. The present invention also relates to an optical glass having refractive index of 1.55 or more, having a ratio (b*/|a*|) of chromaticity b* to an absolute value of chromaticity a* that satisfies b*|a*|?0.55 under A light source in a CIELab representation, and satisfying b*?0.1.

Abstract: The present invention relates to an optical glass having refractive index of 1.55 or more and having chromaticity b* that satisfies b*?4.8 under A light source in a CIELab representation. The present invention also relates to an optical glass having refractive index of 1.55 or more, having a ratio (b*/|a*|) of chromaticity b* to an absolute value of chromaticity a* that satisfies b*/|a*|?0.55 under A light source in a CIELab representation, and satisfying b*?0.1.

Abstract: Glass has a refractive index of 1.55 or more, and has, in an x-ray absorption fine structure (XAFS) analysis of platinum, a peak intensity ratio expressed by Amax/Aave of 1.13 or more, where Amax denotes a maximum value of a white line within an energy range of 13,270 eV to 13,290 eV, and Aave denotes an average absorption in an energy range of 13,290 eV to 13,390 eV.

Abstract: 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.

Abstract: 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.

Abstract: An optical glass has: a refractive index (nd) of 1.81 to 2.15; a density (d) of 6.0 g/cm3 or less; a temperature T1, at which a viscosity of the glass is 101 dPa·s, of 900° C. to 1,200° C.; a devitrification temperature of 1,300° C. or lower; and a content of SiO2 of 5% to 44% in mol % based on oxides.

Abstract: Provided is an optical glass having a high refractive index and high light transmittance. The optical glass contains, in terms of mol % based on oxides, SiO2: 9.0% to 11.0%, B2O3: 22.0% to 24.0%, La2O3: 18.0% to 20.0%, and TiO2: 30.0% to 31.0%.

Abstract: Provided is an optical glass having a high refractive index and high light transmittance. The optical glass contains, in terms of mol % based on oxides, SiO2: 9.0% to 11.0%, B2O3: 22.0% to 24.0%, La2O3: 18.0% to 20.0%, and TiO2: 30.0% to 31.0%.

Abstract: Provided is an optical glass having a high refractive index and high light transmittance. The optical glass contains, in terms of mol % based on oxides, SiO2: 9.0% to 11.0%, B2O3: 22.0% to 24.0%, La2O3: 18.0% to 20.0%, and TiO2: 30.0% to 31.0%.

Abstract: To provide optical glass having high refractive index and low density and having favorable production properties. An optical glass having refractive index (nd) of from 1.71 to 2.00, density of at most 5.0 g/cm3, a temperature at which the viscosity of the glass is log ?=2 of from 750 to 1,200° C. and devitrification temperature of at most 1,300° C., and containing from 0% to 21.5% of TiO2 as represented by mol % based on oxides. The optical glass has high refractive index and low density, has favorable production properties, and is suitable as an optical member for wearable devices, for vehicles, for robots, etc.

Abstract: The present invention relates to an optical glass having refractive index of 1.55 or more and having chromaticity b* that satisfies b*?4.8 under A light source in a CIELab representation. The present invention also relates to an optical glass having refractive index of 1.55 or more, having a ratio (b*/|a*|) of chromaticity b* to an absolute value of chromaticity a* that satisfies b*/|a*|?0.55 under A light source in a CIELab representation, and satisfying b*?0.1.

Abstract: An optical glass has a refractive index (nd) of 1.55 or more. A difference (Tf?Tg) between a fictive temperature (Tf) and a glass transition temperature (Tg) of the optical glass is 0° C. or more. The optical glass may have a crack initiation load L of 350 mN or more.

Abstract: 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.

Abstract: To provide tempered glass which is thin and can be produced by common air-quench tempering without requiring a special production facility, and untreated glass for such tempered glass. The tempered glass is obtainable via a heating step and a cooling step. The heating step is a step of applying heat treatment to glass to be treated, of which the glass transition point is from 500 to 600° C. and the maximum value of the thermal expansion coefficient (?max) between the glass transition point and the yield point is at least 430×10?7/° C. The cooling step is a step of applying air-quenching treatment to the glass to be treated.

Abstract: A glass substrate for a Cu—In—Ga—Se solar cell. The glass substrate includes the specific amounts of SiO2, Al2O3, B2O3, MgO, CaO, SrO, BaO, ZrO2, Na2O and K2O. In the glass substrate, MgO+CaO+SrO+BaO is from 10 to 30%, Na2O+K2O is from 8 to 20%, Na2O/K2O is from 0.7 to 2.0, and (2×Na2O-2×MgO—CaO)×(Na2O/K2O) is from 3 to 22. The glass substrate has a glass transition temperature of from 640 to 700° C., an average coefficient of thermal expansion of from 60×10?7 to 110×10?7/° C., and a density of from 2.45 to 2.9 g/cm3.

Abstract: To provide a glass plate to be tempered, which has a low thermal expansion coefficient at relatively low temperature, and which can have a sufficiently high surface compression stress by a conventional heat tempering process, even when it is thin. A glass plate to be tempered, which contains B2O3 in a range of from 12.5 to 35 mol % in its composition, the difference [X?Y] between the total content X of compounds selected from MgO, CaO, BaO, Na2O and K2O in the composition and the content Y of B2O3 in the composition being within a range of from ?5 to 10 mol %, and which is to be tempered by heating and quenching.