Patent ID: 7251538

Claim:
A method for designing a mold, comprising: preparing a mold of which molding surface is formed to be a design curved surface in a spherical shape of a molded product; measuring a curved surface shape of a molded product which is molded from the mold; comparing a measured curved surface of the above-described molded product and the above-described design curved surface of the above-described molded product and obtaining an error of both the curved surfaces; specifying information corresponding to the error as correction information for molding a molded product of which curved surface is in a spherical shape; and correcting a design value of the molding surface of a mold with which a finished molded product with a curved surface in an aspherical shape is molded by using the above-described correction information suited to the molded product having the curved surface in the aspherical surface shape to design the mold.