Patent ID: 7183128
Filing Date: 2007-02-27
Classification: G03F

Abstract:
1. A photo mask which is used for exposure of an isolated pattern and a dense pattern for a semiconductor substrate, in which said dense pattern has a plurality of linear patterns, comprising: a transparent substrate; an isolated linear pattern defining the isolated pattern; a pair of first openings separated from each other by a first distance, wherein one of said pair of first openings is arranged at one side of said isolated linear pattern, and another of said pair of first openings is arranged at another side of said isolated linear pattern; a first assistant pattern provided apart from said isolated linear pattern by said one of said pair of first openings; a first assistant pattern opening arranged at one side of said first assistant pattern so that said first assistant pattern is disposed between said first assistant pattern opening and said one of said pair of first openings; and a plurality of second openings, wherein each of said plurality of linear patterns is sandwiched between two of said plurality of second openings that are adjacent to each other, wherein each of said plurality of linear patterns is separated from an adjacent linear pattern of said plurality of linear patterns by a predetermined distance, wherein a phase of light transmitted through said one first opening and a phase of light transmitted through said first assistant pattern opening are opposite to each other, and wherein a phase of light transmitted through one of said plurality of second openings and a phase of light transmitted through another of said plurality of second openings adjacent to said one of said second openings are opposite to each other.