| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a method for manufacturing a glass plate by which inward creasing and the generation of a nonuniform woody texture pattern are prevented without causing fusion of glass to a casting mold, so that a high-quality glass plate with a uniform thickness and small warpage is stably molded; and to provide methods for manufacturing a glass material for press molding, an optical element and a thin sheet glass using such a glass plate. <P>SOLUTION: The method for manufacturing a glass plate includes: continuously casting molten glass flowing out of an orifice into a casting mold having a pair of opposed side walls which define the width of a glass plate, and a bottom part having a surface (a top surface) which forms one of opposed two principal surfaces of a glass plate; and continuously molding a flat glass plate while moving the cast glass along both the side walls in one direction (a molding direction) from the upstream side to the downstream side. The casting of the molten glass and the molding to the flat plate shape are carried out while locally cooling, when the top surface is viewed from above, a position of the top surface directly below the orifice and a region which extends from the position directly below the orifice in the molding direction and the width of which increases discontinuously or continuously toward the downstream side. <P>COPYRIGHT: (C)2012,JPO&INPIT |
