Patent ID: 9650278
Date: 2017-05-16
CPC Classifications: C03B,Y02P

Claim:
1. A manufacturing method of a glass formed body, the method comprising: heating a plate-shaped glass material placed on a lower die of a forming die having a pair of an upper die and the lower die, wherein each of the upper die and lower die have a forming surface to form the glass formed body; pressing the heated plate-shaped glass material by the forming die to transfer shapes of forming surfaces of the forming die; and cooling and solidifying the glass material having the transferring shapes of the forming surfaces, after the pressing, wherein each of the forming surfaces of the upper die and the lower die has a planar-view counter shape respectively, and each of the planar-view contour shapes is non-circular, a gap between the upper die and the lower die formed by the forming surfaces is formed so as to become wider from an inner side toward an outer side within the smaller planar-view contour shape of the forming surfaces out of those of the upper die and the lower die, and a pressure distribution occurring in the plate-shaped glass material in the pressing thereof is uniform in a contour region of each of the forming surfaces.