Patent ID: 7220975

Claim:
A method of producing a mask-making member, said member has a plurality of pattern formation regions in which mask circuit patterns are to be formed, and a supporting region in which any mask circuit pattern is not to be formed, said supporting region being provided for holding said plurality of pattern formation regions while separating said plurality of pattern formation regions from each other, said supporting region having first alignment marks used at the time of alignment with a mask made from said mask-making member for forming said mask circuit patterns thereon, second alignment marks being used at a time of alignment with a substrate to be exposed for forming circuit patterns thereon, said method comprising the step of: forming all of said first alignment marks and said second alignment marks on said mask-making member at one time, said first alignment marks being formed in such a manner that one or more of said first alignment marks are located in a portion of said supporting region around each of said plurality of pattern formation regions and said second alignment marks being formed in such a manner as to be all located in a portion of said supporting region outside an area formed by said plurality of said pattern formation regions, and the alignment with said mask-making member for forming said first alignment marks and said second alignment marks thereon at one time is performed by using a stepper type exposure system with a projected magnification of a 1:1 ratio or a low reduction ratio.