| abstract |
A method for producing a glass substrate having a surface having concave and convex portions, which comprises providing a glass substrate comprising at least one oxide selected from SiO2, B2O3, P2O5, GeO2, As2O5, ZrO2, TiO2, SnO2, Al2O3, MgO and BeO, and has a composition in which the content of the at least one oxide is more than 90 mole %, applying a pressure to a prescribed region of the surface of the glass substrate and then etching a region including the prescribed region, to thereby form concave and convex portions on the above surface. Since the glass substrate having the above composition has a high ratio of a network forming oxide or an intermediate oxide, the glass is more susceptible to compression, which results in that efficient formation of projections is achieved without the utilization of the selective elution of the component being easy to elute into an etchant, which leads, in turn, to the easy achievement of the combination with good resistance to an acid. A glass substrate produced by the above method has a fine texture imparted on its surface with high efficiency of the formation of projections, and also is excellent in acid resistance. |