Optical glass and optical component
AssigneeAGC Inc.
InventorsShinichi Amma, Tatsuo Nagashima
Life of this patent
Estimating the term…
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.
Claims19
An optical glass having a refractive index (nd) of 1.64 or more, wherein 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×P650A750×P750) (1),
- provided that A450 is an absorbance of the optical glass with a plate thickness of 10 mm at a wavelength of 450 nm, P450 is a radiance of light having a wavelength of 450 nm at 1,300° C. according to Planck's radiation law, A550 is an absorbance of the optical glass with a plate thickness of 10 mm at a wavelength of 550 nm, P550 is a radiance of light having a wavelength of 550 nm at 1,300° C. according to Planck's radiation law, A650 is an absorbance of the optical glass with a plate thickness of 10 mm at a wavelength of 650 nm, P650 is a radiance of light having a wavelength of 650 nm at 1,300° C. according to Planck's radiation law, A750 is an absorbance of the optical glass with a plate thickness of 10 mm at a wavelength of 750 nm, and P750 is a radiance of light at 1,300° C. at a wavelength of 750 nm according to Planck's radiation law,
- wherein 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,
- wherein the optical glass is a P2O5-based optical glass, and
- wherein the optical glass comprises Fe2O3 as the heat ray absorption component, wherein a content of Fe2O3 in the optical glass is from 2 to 40 ppm by mass.
An optical glass having a refractive index (nd) of 1.64 or more, wherein 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×P650A750×P750) (1),
- provided that A450 is an absorbance of the optical glass with a plate thickness of 10 mm at a wavelength of 450 nm, P450 is a radiance of light having a wavelength of 450 nm at 1,300° C. according to Planck's radiation law, A550 is an absorbance of the optical glass with a plate thickness of 10 mm at a wavelength of 550 nm, P550 is a radiance of light having a wavelength of 550 nm at 1,300° C. according to Planck's radiation law, A650 is an absorbance of the optical glass with a plate thickness of 10 mm at a wavelength of 650 nm, P650 is a radiance of light having a wavelength of 650 nm at 1,300° C. according to Planck's radiation law, A750 is an absorbance of the optical glass with a plate thickness of 10 mm at a wavelength of 750 nm, and P750 is a radiance of light at 1,300° C. at a wavelength of 750 nm according to Planck's radiation law,
- wherein 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, and
- wherein the optical glass comprises NiO as a heat ray absorption component, wherein a content of NiO in the optical glass is from 0.5 to 10 ppm by mass.
Dependencies are inferred from the claim text.