Patent ID: 7060996

Claim:
A mask including at least three masks, each said mask comprising: a support frame; a thin film formed thinner than said support frame and surrounded by said support frame, said thin film having the same shape and size among all of the masks; a first section comprised of one of four sections consisting of regions obtained by dividing said thin film into four by a first straight line passing through a first point consisting of one point on said thin film and extending in a first direction and a second straight line orthogonal to said first straight line at said first point and extending in a second direction; a second section adjacent to said first section in the first direction; a third section adjacent to said second section in the second direction; a fourth section adjacent to said third section in the first direction and adjacent to said first section in the second direction; a plurality of blocks obtained by dividing said thin film, including said first to fourth sections, into regions; a group of selected blocks composed of selected blocks selected from said plurality of blocks, said selected blocks being connected to at least two other selected blocks or connected to at least one other selected block and said support frame; holes formed in said thin film of non-selected blocks and passed through by a charged particle beam, in each mask, said holes formed in complementary divided patterns forming different parts of the same pattern; struts formed on said thin film of said group of selected blocks, said struts connected to the support frame; skirts provided in parallel to said struts at said thin film at the two side parts of said struts; strut zones comprised of said struts and said skirts at the two sides of said struts; and pattern regions formed in the intervals between said strut zones; all of said plurality of blocks becoming non-selected blocks in at least two of said masks; wherein the length of one side of said pattern region is made a whole multiple when the width of said strut zone is set as 1.