Patent ID: 9632407
Date: 2017-04-25
CPC Classifications: G03F

Claim:
1. A mask processing apparatus comprising: a stage configured to hold a mask formed with a pattern to be transferred to a transfer target substrate; a laser light source configured to output laser light that is radiated into the mask and thereby alters the mask; a rotary mechanism configured to rotate the stage in an in-plane direction of a pattern formation surface of the mask; and a deformation parameter calculating device configured to calculate a second deformation parameter representing an irradiation shape of the laser light for when the mask is rotated to a second rotation angle, based on a first deformation parameter representing an irradiation shape of the laser light for when the mask is rotated to a first rotation angle, the deformation parameter calculating device being configured to calculate the second deformation parameter by rotating the first deformation parameter by an amount corresponding to a difference between the first rotation angle and the second rotation angle.