Patent ID: 7892708
Filing Date: 2011-02-22
Classification: G03F,Y10T

Abstract:
1. An exposure mask for a mask stage of an exposure system, comprising: a substrate; and a thin film formed on the substrate, the thin film having a mask pattern; wherein: a flatness of a rectangular flatness measurement area, excluding an area of 2 mm inward from an outer peripheral end surface on a main surface of the substrate on a side to be set on the mask stage, is 0.6 μm or less, at least three of four corner portions of the flatness measurement area each have a rising shape that rises toward an outer peripheral side, the flatness measurement area is an area including a pattern area serving as a rectangular area for formation of the mask pattern, and the rising shape at the corner portion of the flatness measurement area is a shape having a maximum height of 0.25 μm or less, but greater than 0, using, as a reference point, a corner among corners of the pattern area that is closest to the corner portion of the rising shape, wherein: the thin film comprises at least one of a light shielding film for shielding exposure light used upon transfer to a transfer target, a phase shift film for changing a phase difference of the exposure light, a reflecting film for reflecting the exposure light, or a light absorber film for absorbing the exposure light.