| 摘要 |
A glass composition that has improved infrared absorptivity while preventing the visible light transmittance from decreasing excessively. The glass composition includes: the following components, expressed in mass %: 65<SiO2<=75; 0<=B2O3<=5; 0<=Al2O3<=5; 0<=MgO<2; 10<CaO<=15; 0<=SrO<=10; 0<=BaO<=10; 0<=Li2O<=5; 10<=Na2O<=15; 0<=K2O<=5; and 0<=TiO2<=0.5, where 10<MgO+CaO+SrO+BaO<=20 and 10<=Na2O+K2O<=17.5; MnO 0 to 300 mass ppm; and the following components as colorants, expressed in mass %: 0.4<=T-Fe2O3<=1.0, where T-Fe2O3 is total iron oxide expressed as Fe2O3; and 0<=CeO2<=2.0. The mass ratio of FeO expressed as Fe2O3 to T-Fe2O3 is 20 to 44%. The wavelength at which a minimum transmittance is obtained in a range of 550 to 1700 nm is at least 1065 nm. The transmittance that is obtained at a wavelength of 1650 nm is not higher than the transmittance that is obtained at a wavelength of 730 nm.
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