Agc Inc.

Shinichi Amma

Tatsuo Nagashima

Akira Shibata

An optical glass has a refractive index (n) 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.

Optical glass, optical member, and wearable device

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.

Optical glass, optical member, and optical device

An optical glass has a refractive index (n) of 1.64 or more. A P value represented by the following formula (1) is in a range of 7.0&#x3c;P value&#x3c;10.0: P value=log(A&#xd7;P+A&#xd7;P+A&#xd7;P+A&#xd7;P) (1). A, A, Aand Aare 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. P, P, Pand Pare radiances of light having a wavelength of 450 nm, 550 nm, 650 nm and 750 nm, respectively, at 1,300&#xb0; 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.

Optical glass and optical component

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, SiO: 9.0% to 11.0%, BO: 22.0% to 24.0%, LaO: 18.0% to 20.0%, and TiO: 30.0% to 31.0%.

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Tokyo, Japan

Shinichi Amma