Patent ID: 9670089
Date: 2017-06-06
CPC Classifications: C03C,H01L,H05B,Y02E,Y10T

Claim:
1. A glass substrate, which has a thickness of 2 mm or less and has a refractive index nd of 1.55 or more, wherein the glass substrate comprises, in terms of mass %, 10 to 50% of SiO 2 , 15 to 40% of BaO, 0 to 3% of Ta 2 O 5 , 35% or less of Nb 2 O 5 , 5% or less of ZrO 2 , 0 to 8.5% of ZnO, less than 0.1% of Li 2 O+Na 2 O+K 2 O, 0 to 6% of B 2 O 3 , 3 to less than 10% of TiO 2 , and is free of PbO, and has a thermal expansion coefficient of 60×10 −7 /° C. to 120×10 −7 /° C. in a temperature range of 30 to 380° C.