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US 7,321,419 B2Granted
Exposure apparatus, and device manufacturing method
AssigneeNikon Corporation
InventorAkimitsu Ebihara
Life of this patent
Estimating the term…
Abstract
A hydrostatic bearing is provided opposite to a wafer on a table. The hydrostatic bearing maintains the distance between the bearing surface and the wafer in the direction of the optical axis of a projection optical system at a predetermined value.
Claims7
An exposure apparatus that supplies liquid in a space between a projection optical system and a substrate, illuminates a pattern with an energy beam, and projects an image of the pattern onto the substrate via the projection optical system and the liquid, the exposure apparatus comprising:
- a first table where a mount area is formed and the surface of an area around the mount area is set substantially flush to the surface of a substrate mounted on the mount area, the first table being movable within an area that includes a first area containing a position below the projection optical system;
- a second table where a mount area is formed and the surface of an area around the mount area is set substantially flush to the surface of a substrate mounted on the mount area, the second table being movable independently from the first table within an area including the first area;
- and
- a stage drive system by which the first table and the second table are moved simultaneously from a first state in which one of the tables is positioned at the first area to a second state in which the other table is positioned at the first area while maintaining a state in which both tables are in contact with each other or close together to prevent liquid from flowing between the tables.
1 more element
Dependencies are inferred from the claim text.