Patent ID: 7998641

Claim:
A photomask comprising: a transparent substrate having a transparent property against exposing light; a semi-light-shielding portion formed on the transparent substrate; a first opening formed in the semi-light-shielding portion and having a first dimension; a second opening formed in the semi-light-shielding portion and having a second dimension larger than the first dimension; a phase-shifting portion formed on the transparent substrate around the first opening and transmitting the exposing light in an opposite phase with respect to the first opening; and a light-shielding portion formed on the transparent substrate around the second opening, wherein: the phase-shifting portion is formed around the first opening with part of the semi-light-shielding portion interposed between the phase-shifting portion and the first opening, the semi-light-shielding portion transmits the exposing light in an identical phase with respect to the first opening and the second opening, and the light-shielding portion has a width set to be not more than a maximum width with which an unexposed region is not formed by the exposing light having passed through the second opening and diffracting at an edge of the second opening toward a back of the light-shielding portion.