Patent ID: 7820575

Claim:
A near-infrared absorbent green glass composition comprising, in mass %: 65 to 80% SiO 2 , 0 to 5% B 2 O 3 , 0 to 5% Al 2 O 3 , 0 to 10% MgO, 5 to 15% CaO, 10 to 18% Na 2 O, 0 to 5% K 2 O, 0 to 2% TiO 2 , 0.05 to 0.5% SO 3 , 0.98 to 1.3% T-Fe 2 O 3 which means a total iron oxide amount in terms of Fe 2 O 3 , 0.65 to 2.0% CeO 2 and, in mass ppm, 300 ppm or less MnO, wherein a total content of MgO and CaO is from 5 to 20 mass %, a total content of Na 2 O and K 2 O is from 10 to 20 mass %, a FeO ratio represented by a mass ratio of FeO converted into Fe 2 O 3 relative to said T-Fe 2 O 3 is from 0.275 to 0.35, and at least one of the following a) and b) is satisfied: a) when the near-infrared absorbent green glass composition is formed to have a thickness in the range of 1.3 to 2.4 mm, a visible light transmittance measured by using CIE illuminant A is at least 80%, a total solar energy transmittance is 62% or less, a dominant wavelength measured by using CIE illuminant C is from 500 to 540 nm, and an integrated value obtained by integrating transmittances of every 1 nm in the wavelength from 1100 to 2200 nm is 62000 or less; b) when the near-infrared absorbent green glass composition is formed to have a thickness in the range of 3 to 5 mm, a visible light transmittance measured by using CIE illuminant A is at least 70%, a total solar energy transmittance is 45% or less, a dominant wavelength measured by using CIE illuminant C is from 495 to 540 nm, and an integrated value obtained by integrating transmittances of every 1 nm in the wavelength from 1100 to 2200 nm is 62000 or less.