Patent ID: 6911747

Claim:
An X-Y stage system comprising a bed, an X-stage movable relatively to the bed through a first linear motion guide unit in an X-direction, and a Y-stage movable relatively to the X-stage through a second linear motion guide unit in a Y-direction; wherein a first linear motor to force the X-stage relatively to the bed in the X-direction is comprised of a pair of first field magnets of secondary side held on an upper surface of the bed, and a first armature winding of primary side suspended from a lower surface of the X-stage in a way lying in a clearance between the first field magnets; wherein the X-stage is allowed to move relatively to the bed when an electric current existing in the first armature winding interacts electromagnetically with a magnetic flux created by the first field magnets; wherein a second linear motor to force the Y-stage relatively to the X-stage in the Y-direction is comprised of a pair of second field magnets of secondary side held on a lower surface of the Y-stage, and a second armature winding of primary side supported on an upper surface of the X-stage in a way lying in a clearance between the second field magnets; and wherein the Y-stage is allowed to move relatively to the X-stage when an electric current existing in the second armature winding interacts electromagnetically with a magnetic flux created by the second field magnets.