3D cover glass, mold for molding same, and method for manufacturing 3D cover glass

A molding die for 3D cover glass comprising:

• a flat central part;
• a peripheral part;
• and a curved part located at least in a portion of the peripheral part and defining a 3-dimensional curved surface having a curvature radius of 100 mm or less,
• wherein the molding die comprises a pair of a convex mold and a concave mold each having a flat press surface A corresponding to the central part and a press surface B corresponding to the curved part,
• wherein the closest distance D [mm] between the press surfaces A of the convex mold and the concave mold during press-molding is t mm or larger and (t+0.02) mm or smaller wherein t [mm] represents a plate thickness of a 3D cover glass as a final product;
• and
• wherein in the convex mold, when a boundary line between the press surface A and the press surface B is defined as a first position where the curvature radius becomes 100 mm or less in a direction from the center of the press surface A toward a periphery;
• an original point is defined as an arbitrary point on the boundary line;
• an X axis is defined as a line extending from the original point in parallel to the press surface A and orthogonally to the boundary line;
• in the X axis, a direction toward the press surface A from the original point is defined as a minus direction and the opposite direction thereof is defined as a plus direction;
• a Z axis is defined as the normal line direction at the center of the press surface A;
• and in a cross-sectional view in the XZ plane, the closest distance between the press surfaces B of the convex mold and the concave mold during press-molding at individual locations of the press surface B is represented by D1 [mm], the maximum value of the change amount ΔD1/ΔX of D1 in the plus direction of the X axis with the convex mold as a reference is 0.01 or more and the maximum value of D1 is (t+0.10) mm or larger and (t+0.50) mm or smaller.