Patent ID: 7838176
Filing Date: 2010-11-23
Classification: G03F

Abstract:
1. A photo mask comprising: a mask substrate; a first main pattern to be transcribed to a wafer formed on the mask substrate; and a second main pattern to be transcribed to the wafer formed on the mask substrate wherein the second main pattern is adjacent to the first main pattern and opposite sides between the first main pattern and the second main pattern respectively have the same transmittance; wherein the first main pattern comprises a first frame pattern having a shape of a contour of the first main pattern and a third pattern filling an inner region of the first frame pattern, which first frame pattern includes a first pattern arranged in an aperture direction of an illuminating system and a second pattern arranged perpendicularly to the aperture direction of the illuminating system, wherein a transmittance of the first pattern is lower than a transmittance of the second pattern; wherein the second main pattern comprises a second frame pattern having a shape of a contour of the second main pattern and a third pattern filling an inner region of the second frame pattern, which second frame pattern includes a first pattern disposed in the same direction as the first pattern of the first main pattern and a second pattern disposed in the same direction as the second pattern of the first main pattern.