Mask holding method, mask and mask chuck, exposure apparatus using the mask and the mask chuck, and device production method using the exposure apparatus

摘要

V-shaped linear groove portions are formed at regular intervals and at three positions (with 120 DEG pitches) on a periphery, concentric with a ring-shaped support frame, of an X-ray mask to extend in the radial direction. On the other hand, corresponding mounts, as projecting portions, each having a spherical leading end are disposed at three positions on a mask chuck. The mask is held on the mask chuck at the three positions by engaging the corresponding V-shaped linear groove portions and the projecting portions.