Patent ID: 7364822

Claim:
A photomask comprising a mask pattern having light-shielding properties with respect to exposure light provided on a transparent substrate having light-transmitting properties with respect to the exposure light, wherein the mask pattern includes a semi-light-shielding portion having a specific transmittance with respect to the exposure light and a phase shifter disposed in an opening provided in the semi-light-shielding portion; the semi-light-shielding film has a same outer shape as that of the mask pattern; the phase shifter generates an opposite phase with respect to the exposure light between the phase shifter and a light-transmitting portion in which the mask pattern is not formed on the transparent substrate; and the semi-light-shielding portion generates a phase difference of(−30+360×n) degrees or more and (30+360×n) degrees or less, where n=an integer, with respect to the exposure light between the semi-light-shielding portion and the light-transmitting portion.