Patent ID: 8273262

Claim:
A method for etching a glass substrate surface, comprising: etching a surface of a glass substrate in an etching amount of 1-690 μm, wherein the etching comprises applying an etchant having an HF concentration of 1-5 wt % and an HCl concentration of 1 wt % or higher, the glass substrate comprises 50 to 66% by mass of SiO 2 , 10.5 to 22% by mass of Al 2 O 3 , 5 to 12% by mass of B 2 O 3 , 0 to 8% by mass of MgO, 0 to 14.5% by mass of CaO, 0 to 24% by mass of SrO, and 0 to 13.5% by mass of BaO, and a sum of MgO, CaO, SrO and BaO in the glass substrate is 9 to 29.5% by mass.