Patent ID: 9242889
Filing Date: 2016-01-26
CPC Classification: C03B,Y02P

Claim Text:
1. A method of manufacturing a casting mold or a portion of a casting mold, wherein the casting mold or the portion of a casting mold is used in the manufacture of an eyeglass lens, and wherein the method comprises: providing a glass material of essentially equal thickness in a normal direction and having upper and lower surfaces that are spherical in shape, wherein the upper spherical surface has a smaller radius of curvature than the lower spherical surface, and the radii of curvature of the upper and lower spherical surfaces are constant over the entirety of the surfaces, providing a mold comprising a forming surface having a free-form shape other than spherical, positioning the glass material on the forming surface, and heating the glass material to a temperature permitting deformation to bring the lower surface of the glass material into tight contact with the forming surface, whereby the glass material is formed into the casting mold or the portion of a casting mold, which is used in the manufacture of an eyeglass lens, whereby the upper surface of the glass material is formed so that spacing between the upper surface of the glass material and the forming surface of the mold in the normal direction is approximately equal at all positions, and wherein the glass material has a thickness ranging from 2 to 10 mm in a normal direction.