Patent ID: 7850880

Claim:
A method for forming a negative mold for an aspherical optical element, the method comprising the steps of: preparing a master mold and a first substrate; adding resin to form a single first resin layer between the first substrate and the master mold; curing the first resin layer so that the first resin layer and the first substrate are bonded to each other to form the negative mold; and separating the negative mold from the master mold, wherein the first resin layer is a single layer; and wherein a shape of the first substrate is represented by the equation: F N =−(2 ×F M −F R −s×F M )/(1 −s ), F N representing a shape of the first substrate; F M representing a shape of the master mold; F R representing a shape of a second substrate having a flat or spherical surface for forming the aspherical optical element with the negative mold; and s representing a cure shrinkage ratio of the resin.