Patent ID: 8895461

Claim:
A method of manufacturing a glass substrate for a flat panel display, the method comprising: a melting step of melting, by employing at least direct electrical heating, glass raw materials blended so as to provide a glass comprising: 52-78 mass % of SiO 2 , 3-25 mass % of Al 2 O 3 , 3-15 mass % of B 2 O 3 , 3-25 mass % of RO, wherein RO is total amount of MgO, CaO, SrO, and BaO, 0.01-1 mass % of Fe 2 O 3 , and 0-0.3 mass % of Sb 2 O 3 , and substantially not comprising As 2 O 3 , the glass having a mass ratio (SiO 2 +Al 2 O 3 )/B 2 O 3 in a range of 7-30 and a mass ratio (SiO 2 +Al 2 O 3 )/RO equal to or greater than 6; a forming step of forming the molten glass into a flat-plate glass; and an annealing step of annealing the flat-plate glass, wherein a heat shrinkage reduction process is performed in the annealing step, the heat shrinkage reduction process being a process in which cooling rate in a central section of the flat-plate glass is set to 50-300° C./minute within a temperature range of from Tg to 100° C. below Tg.