Patent ID: 6654107
Filing Date: 2003-11-25
Classification: G01M,G03F

Abstract:
A pattern to be utilized for stepper lens aberration characteristics evaluation, comprising a plurality of joint pattern sets respectively rotated by an equal angle one to the next, each joint pattern set including one or more joint pattern pairs, each joint pattern pair including a pair of joint patterns positioned a distance from each other, each joint pattern constituted of a line-and-space type first pattern and a roughly rectangular second pattern, joined in a rough comb shape, the first pattern the first pattern constituted of a plurality of line patterns each having a width along the direction of the shorter side thereof set at a dimension that does not allow separation/resolution on a field of view of an optical length measuring machine, the second pattern having external dimensions that allow separation/resolution in the field of view of said optical length measuring machine, the distance from each other of the joint patterns of each joint pattern pair being set so as to allow separation/resolution in the field of view of the optical length measuring machine with line portions of said first patterns extending outward and achieving a symmetrical positional relationship with each other.