Patent ID: 8308961

Claim:
A method of producing a mold having recesses for imprint lithography, by etching with two masks, with the mold being used in imprint lithography, comprising: etching with a first mask having openings, to form a desired pattern of the recesses to be formed on the surface of the mold, and with a second mask to partially cover the openings of the first mask, in which the openings of the first mask each have an opening ratio different from each other, wherein, the following three conditions are met: (1) in a portion in which the opening ratio of the openings of the first mask is minimum, the second mask is not placed on the first mask so as not to cover the openings of the first mask at all: (2) in a portion in which the opening ratio of the openings of the first mask is maximum, the second mask is placed on the first mask so as to cover the entire openings of the first mask: and (3) in other portions in which the opening ratios of the openings of the first mask are more than the minimum but not more than the maximum, the second mask is placed on the first mask so as to partially cover the openings of the first mask, depending on the opening ratio of the first mask such that the second mask covers a wider area of the openings of the first mask as an opening ratio of the desired pattern to be formed on the surface of the mold by the first mask is higher, thereby to make a volume of the respective recess to be formed on the mold in a given area uniform and to make a residual film distribution uniform regardless of the opening ratio of the desired pattern.