Ultraviolet transmitting glass
AssigneeAGC Inc.
InventorsTakahiro Sakagami, Makoto Shiratori
Life of this patent
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Abstract
An ultraviolet transmitting glass containing, in mole percentage based on oxides, 55 to 80% of SiO2, 12 to 27% of B2O3, 4 to 20% of R2O (where R represents an alkali metal selected from a group consisting of Li, Na, and K) in total, 0 to 3.5% of Al2O3, 0 to 5% of R′O (where R′ represents an alkaline earth metal selected from a group consisting of Mg, Ca, Sr, and Ba) in total, 0 to 5% of ZnO, and 0 to 10% of ZrO2, wherein transmittance at a wavelength of 254 nm in terms of spectral transmittance at a plate thickness of 0.5 mm is 70% or more. The glass with high ultraviolet light transmittance, in particular, high deep ultraviolet light transmittance is provided.
Claims18
An ultraviolet transmitting glass containing, in mole percentage based on oxides,
- 55 to 80% of SiO2,
- 12 to 27% of B2O3,
- 4 to 20% of R2O in total, where R represents at least one kind of an alkali metal selected from a group consisting of Li, Na, and K,
- 0.0001 to 0.0006% of TiO2,
- 0 to 3.5% of Al2O3,
- 0 to 5% of R′O in total, where R′ represents at least one kind of an alkaline earth metal selected from a group consisting of Mg, Ca, Sr, and Ba,
- 0 to 5% of ZnO, and
- 0 to 10% of ZrO2,
- wherein transmittance at a wavelength of 254 nm in terms of spectral transmittance at a plate thickness of 0.5 mm is 70% or more.
An ultraviolet transmitting glass contains, in mole percentage based on oxides,
- 55 to 80% of SiO2,
- 12 to 27% of B2O3,
- 4 to 20% of R2O in total, where R represents at least one kind of an alkali metal selected from a group consisting of Li, Na, and K,
- 0.0001 to 0.0006% of TiO2,
- 0 to 3.5% of Al2O3,
- 0 to 5% of R′O in total, where R′ represents at least one kind of an alkaline earth metal selected from a group consisting of Mg, Ca, Sr, and Ba,
- 0 to 5% of ZnO, and
- 0 to 5% of Ta2O5,
- wherein transmittance at a wavelength of 254 nm in terms of spectral transmittance at a plate thickness of 0.5 mm is 70% or more.
Dependencies are inferred from the claim text.