Claims
- 1. A method for shifting the absorption peak wavelength in the wavelength range 900-1600 nm of an infrared radiation absorbing glass from less than 1100 nm to 1100 nm or longer without substantially changing the tint of the glass, comprising the step of irradiating the glass which comprises, in % by weight:65 to 80% SiO2, 0 to 5% Al2O3, 0 to 10% MgO, 5 to 15% CaO, 10 to 18% Na2O, 0 to 5% K2O, 5 to 15% Mgo+CaO, 10 to 20% Na2O+K2O, and 0 to 5% B2O3; 0.02% or more total iron oxide (T-Fe2O3) in terms of Fe2O3, 0 to 2.0% CeO2, 0 to 1.0% TiO2, 0 to 0.005% CoO, and 0 to 0.005% Se, with ultraviolet light of 400 nm or shorter at an energy density of 1.0×106 J/m2/hr or more to increase the content of FeO in the irradiated glass by reducing Fe(III) to Fe(II), the ultraviolet light irradiated glass thereby comprising 0.02 wt. % or more FeO in terms of Fe2O3.
- 2. The method as claimed in claim 1, wherein the infrared radiation absorbing glass comprises, in % by weight:0.05% or more T-Fe2O3 in terms of Fe2O3.
- 3. The method as claimed in claim 1, wherein the infrared radiation absorbing glass comprises, in % by weight:0.05 to 1.0% T-Fe2O3 in terms of Fe2O3, and 0.02 to 0.5% FeO in terms of Fe2O3.
- 4. The method as claimed in claim 1, wherein the infrared radiation absorbing glass comprises, in % by weight:0.02 to 0.6% T-Fe2O3 in terms of Fe2O3; 0.02 to 0.3 FeO in terms of Fe2O3; 0.2 to 2.0% CeO2; and 0.0005 to 0.005% Se, wherein the relationship between the transmission at 1,050 nm (T1050) and the transmission at 1,200 nm (T1200) is T1050>T1200.
- 5. The method as claim in claim 1, wherein the content of CeO2 is more than 0.5 to 2.0% by weight.
- 6. The method as claimed in claim 1, wherein the ultraviolet irradiation is conducted with irradiation energy of 7.0×107 to 5.0×108 J/m2.
- 7. A method for shifting the absorption peak wavelength in the wavelength range 900-1600 nm of an infrared radiation absorbing glass from less than 1100 nm to 1100 nm or longer without substantially changing the tint of the glass, comprising the step of irradiating the glass which comprises, in % by weight:65 to 80% SiO2, 0 to 5% Al2O3, 0 to 10% MgO, 5 to 15% CaO, 10 to 18% Na2O, 0 to 5% K2O, 5 to 15% MgO+CaO, 10 to 20% Na2O+K2O, and 0 to 5% B2O3; 0.05% or more total iron oxide (T-Fe2O3) in terms of Fe2O3, 0.5 to 3% total of one or more components selected from CeO2, Sb2O3, As2O3, SnO and Cu2O, 0 to 1.0% TiO2, 0 to 0.005% CoO, and 0 to 0.005% Se, with ultraviolet light of 400 nm or shorter at an energy density of 1.0×106 J/m2/hr or more to increase the content of FeO in the irradiated glass by reducing Fe(III) to Fe(II), the ultraviolet light irradiated glass thereby comprising 0.02 wt. % or more FeO in terms of Fe2O3.
- 8. The method as claim in claim 7, wherein the content of CeO2 is more than 0.5 to 2.0% by weight.
- 9. The method as claimed in claim 7, wherein the ultraviolet irradiation is conducted with irradiation energy of 7.0×107 to 5.0×108 J/m2.
Priority Claims (1)
Number |
Date |
Country |
Kind |
8-145280 |
Jun 1996 |
JP |
|
CROSS-REFERENCE TO THE RELATED APPLICATION
This application is a continuation-in-part application of application Ser. No. 08/864,984, filed May 29, 1997, entitled: INFRARED RADIATION ABSORBING GLASS, abandoned.
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Continuation in Parts (1)
|
Number |
Date |
Country |
Parent |
08/864984 |
May 1997 |
US |
Child |
09/792585 |
|
US |