Patent ID: 7225048
Filing Date: 2007-05-29
Classification: B82Y,G03F,H01J,H01L

Abstract:
1. A gap adjustment apparatus comprising: a mask chuck holding a mask having a mask pattern formed thereon; a first leveling mechanism holding the mask chuck and capable of moving the mask chuck in a first direction perpendicular to a surface on which the mask pattern of the mask fixed on the mask chuck has been formed; a mask stage that supports the first leveling mechanism; a wafer chuck holding a wafers, wherein an exposure surface of the wafer faces towards the mask; a second leveling mechanism capable of moving the wafer chuck in the first direction; a wafer stage holding the second leveling mechanism; a first distance sensor attached on the mask stage and capable of measuring a distance in the first direction, the distance extending to the exposure surface of the wafer held on the wafer chuck; and a second distance sensor attached on the wafer stage and capable of measuring a distance in the first direction, the distance extending to the surface of the mask fixed on the mask chuck, and also capable of measuring another distance in the first direction, the other distance extending to the first distance sensor.