Uv-transmitting glass and molded products
A UV-transmitting glass formed of a multi-component oxide, and having at least one of characteristics of an internal transmittance τ 350-400 (%) with respect to light having a wavelength between 350 nm and 400 nm through a 10 mm-thick glass that satisfies τ 350-400 ≥90 . . . (1); an internal transmittance τ 300-350 (%) with respect to light having a wavelength between 300 nm and 350 nm through a 10 mm-thick glass that satisfies τ 300-350 ≥75 . . . (2); and an internal transmittance τ 260-300 (%) with respect to light having a wavelength between 260 nm and 300 nm through a 10 mm-thick glass that satisfies τ 260-300 ≥45 . . . (3).
1 . 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 SnO 2 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 τ 300-350 (%) with respect to light having a wavelength between 300 nm and 350 nm through a 10 mm-thick glass that satisfies formula (2):
τ 300-350 ≥86% (2)
wherein the UV-transmitting glass comprises, in terms of mol % on an oxide basis:
10-80% of B 2 O 3 ;
0-25% of SiO 2 ; and
2-22% of La 2 O 3 ; and
5-15% of Y 2 O 3 ,
and the UV-transmitting glass has an internal transmittance τ 260-300 (%) with respect to light having a wavelength between 260 nm and 300 nm through a 10 mm-thick glass that satisfies formula (3):
τ 260-300 ≥65% (3).
2 . The method of manufacturing the UV-transmitting glass as claimed in claim 1 , wherein the UV-transmitting glass has an Fe 3+ intensity of less than or equal to 0.0059 as measured by electron spin resonance (ESR).
3 . The method of manufacturing the UV-transmitting glass as claimed in claim 1 , wherein the UV-transmitting glass has an iron oxide content T-Fe 2 O 3 in the glass, as converted into Fe 2 O 3 , being less than or equal to 1.5 mass ppm.
4 . The method of manufacturing the UV-transmitting glass as claimed in claim 1 , wherein a refractive index of the UV-transmitting glass is greater than or equal to 1.7.
5 . The method of manufacturing the UV-transmitting glass as claimed in claim 1 , wherein the UV-transmitting glass has a content of Bi 2 O 3 , TiO 2 , WO 3 , and Gd 2 O 3 each being less than or equal to 3 mol %, in terms of mol % on an oxide basis.
6 . The method of manufacturing the UV-transmitting glass as claimed in claim 5 , wherein the UV-transmitting glass has a content of Nb 2 O 5 being less than or equal to 3 mol %, in terms of mol % on an oxide basis.
7 . The method of manufacturing the UV-transmitting glass as claimed in claim 5 , wherein the UV-transmitting glass has a content of Ta 2 O 5 being less than or equal to 3 mol %, in terms of mol % on an oxide basis.
8 . The method of manufacturing the UV-transmitting glass as claimed in claim 1 , wherein the reducing agent is a tin oxide containing at least one species selected from among SnO 2 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 0.2 mass %.
9 . The method of manufacturing the UV-transmitting glass according to claim 1 , wherein the UV-transmitting glass comprises, in terms of mol % on an oxide basis, 8-15% of Y 2 O 3 .