Patent ID: 8619234

Claim:
A lithography apparatus comprising: a lens assembly that projects and/or focuses the light or beam from an illumination system; a transformer that comprises: a U-shaped inductive core, the U-shaped core comprising a primary leg disposed along a substantially linear primary axis and a secondary leg disposed along a substantially linear secondary axis, an inductive primary coil, and an inductive secondary coil; and a stage device that supports the secondary coil, the stage device configured to move relative to the primary coil and parallel to the substantially linear secondary axis, wherein the secondary coil surrounds a portion of the outer surface of the secondary leg of the U-shaped inductive core inside a portion of the stage device; the primary coil surrounding a portion of the outer surface of the primary leg of the inductive core outside of the stage device, wherein the inductive core and the secondary coil are configured to substantially maintain a separation distance from each other during relative movement between the stage and the inductive core; wherein an electrical current of the primary coil outside of the stage device creates an electromagnetic field that causes an electrical current, via the inductive core, to flow within the secondary coil inside a portion of the stage device.