Patent ID: 7316072

Claim:
An XY stage module comprising: a base; an XY stage horizontally moving above the base in a first direction and a second direction wherein the second direction is orthogonal to the first direction; a supporting unit disposed on the base which elastically supports the XY stage; a stiffener which prevents the XY stage from rotating; and a position sensor comprising: a movable comb-shaped structure disposed at one side of the stiffener comprising at least one movable comb; and a fixed comb-shaped structure fixed on the base comprising at least one fixed comb, wherein the at least one fixed comb is meshed with the at least one movable comb separated by a predetermined gap for measuring a movement of the XY stage in the first direction and the second direction according to a meshing degree of the at least one movable comb and the at least one fixed comb.