Patent ID: 7643130

Claim:
A position measuring apparatus comprising: a holder having storage spaces in which both a first set composed of a three-point support member for supporting a backside of a first substrate being itself a mask for lithography at three points and the first substrate supported on the three-point support member, and a second set composed of a vacuum chuck member for holding a backside of a second substrate being itself a mask for lithography and the second substrate held by the vacuum chuck member are prepared; a stage on which one of the first set and the second set selectively loaded from the storage spaces of the holder is mounted; a vacuum pump to hold and chuck the second substrate through the vacuum chuck member in a state of being mounted on the stage; and a recognition unit to recognize a position of a pattern written on the first substrate supported by the three-point support member mounted on the stage and a position of a pattern written on the second substrate held by the vacuum chuck member on the stage.