Patent ID: 7205077

Claim:
A method for producing a photomask including an isolated light-shielding pattern formed on a transparent substrate that is transparent to exposure light, the isolated light-shielding pattern being formed from a light-shielding film region and a phase shift region, characterized in that it comprises the steps of: (a) forming a light-shielding film on the transparent substrate; (b) patterning the light-shielding film so as to form a light-shielding film pattern in the light-shielding pattern formation region on the transparent substrate; and (c) after the step (b), removing a portion of the inside of the light-shielding film pattern located in the phase shift region so as to form an opening, the phase shift region has phase inversion with respect to a light-transmitting region of the transparent substrate having no light-shielding pattern, the light-shielding pattern has at least a first light-shielding pattern region having a first line width and a second light-shielding pattern region having a second line width which is larger than the first line width, the first light-shielding pattern region is provided with a first phase shift region serving as the phase shift region so as to be surrounded by the light-shielding film region, and the second light-shielding pattern region has no phase shift region.