Uv-transmitting glass and molded products
AssigneeAGC Inc.
InventorsTakenori Someya, Naoki Kanno
Life of this patent
Estimating the term…
Abstract
A UV-transmitting glass formed of a multi-component oxide, and having at least one of characteristics of an internal transmittance τ350-400(%) with respect to light having a wavelength between 350 nm and 400 nm through a 10 mm-thick glass that satisfies τ350-400≥90 . . . (1); an internal transmittance τ300-350(%) with respect to light having a wavelength between 300 nm and 350 nm through a 10 mm-thick glass that satisfies τ300-350≥75 . . . (2); and an internal transmittance τ260-300(%) with respect to light having a wavelength between 260 nm and 300 nm through a 10 mm-thick glass that satisfies τ260-300≥45 . . . (3).
Claims9
A method of manufacturing a UV-transmitting glass, the method comprising:
- melting glass raw materials or glass cullets;
- and
- cooling a glass melt to be solidified,
- wherein during the melting, a melting atmosphere is a non-oxidizing atmosphere, and a reducing agent is contained in the glass raw materials or the glass cullets,
- wherein the reducing agent is a tin oxide containing at least one species selected from among SnO2 and SnO, and the reducing agent is contained in the UV-transmitting glass by an amount of greater than 0 mass % and less than or equal to 0.3 mass %,
- wherein the UV-transmitting glass has an internal transmittance τ300-350(%) with respect to light having a wavelength between 300 nm and 350 nm through a 10 mm-thick glass that satisfies formula (2):
- τ300-350≥86% (2)
- wherein the UV-transmitting glass comprises, in terms of mol % on an oxide basis:
- 10-80% of B2O3;
- 0-25% of SiO2;
- and
- 2-22% of La2O3;
- and
- 5-15% of Y2O3,
- and the UV-transmitting glass has an internal transmittance τ260-300(%) with respect to light having a wavelength between 260 nm and 300 nm through a 10 mm-thick glass that satisfies formula (3):
- τ260-300≥65% (3).
Dependencies are inferred from the claim text.