Patent ID: 7399558

Claim:
A mask manufacturing method suitable for an exposure method wherein a mask on which a contact hole pattern and a supplementary hole pattern with formations smaller than those of the contact hole pattern are arrayed is illuminated, and the light which passed through the mask onto a member to be exposed is projected via a projection optical system, said method comprising: a selecting step for selecting one of a normal array and an offset array as an array of the supplementary hole pattern based on a pitch of the contact hole pattern, a wavelength of the light, and a numerical aperture of the projection optical system; and a forming step for forming the contact hole pattern and the supplementary hole pattern on the mask so as to form the supplementary hole pattern selected in the selecting step, wherein the normal array is an array where a line extending in the vertical direction as to the pitch direction from a predetermined contact hole of said contact hole pattern, and a line connecting a predetermined supplementary hole closest to said predetermined contact hole of the supplementary hole pattern and the predetermined contact hole intersect at an angle of 0°, and wherein the offset array is an array where said angle is 0° or more but less than 45°.