Lithographic apparatus and device manufacturing method
First Claim
Patent Images
1. An apparatus, comprising:
- a substrate table arranged to hold a substrate during exposure in an immersion lithographic apparatus;
a cover plate, physically separate from the substrate table, positioned outward of the substrate during exposure, the cover plate configured to provide a surface, facing a projection system of the immersion lithographic apparatus, that is substantially adjacent to the substrate; and
a plurality of burls arranged between the substrate table and the cover plate.
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Abstract
A lithographic apparatus with a cover plate formed separately from a substrate table and means for stabilizing a temperature of the substrate table by controlling the temperature of the cover plate is disclosed. A lithographic apparatus with thermal insulation provided between a cover plate and a substrate table so that the cover plate acts as a thermal shield for the substrate table is disclosed. A lithographic apparatus comprising means to determine a substrate table distortion and improve position control of a substrate by reference to the substrate table distortion is disclosed.
234 Citations
26 Claims
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1. An apparatus, comprising:
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a substrate table arranged to hold a substrate during exposure in an immersion lithographic apparatus; a cover plate, physically separate from the substrate table, positioned outward of the substrate during exposure, the cover plate configured to provide a surface, facing a projection system of the immersion lithographic apparatus, that is substantially adjacent to the substrate; and a plurality of burls arranged between the substrate table and the cover plate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 23, 24)
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9. A device manufacturing method, comprising:
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projecting a modulated radiation beam, through a liquid, onto a substrate held on a substrate table; and supporting a cover plate, physically separate from the substrate table, on the substrate table at a position outward of the substrate during exposure using a plurality of protrusions arranged between the substrate table and the cover plate, the cover plate providing a surface that is substantially adjacent to a surface of the substrate onto which the modulated radiation beam is incident. - View Dependent Claims (10, 11, 12, 13, 14, 25, 26)
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15. An apparatus, comprising:
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a substrate table to hold a substrate; a projection system to project a modulated radiation beam onto the substrate; a liquid supply system to provide a liquid in a region between the projection system and the substrate table during exposure; and a cover plate physically separate and removable from the substrate table, the cover plate positioned outward of the substrate during exposure and providing a surface facing the projection system that is adjacent to the substrate when supported by the substrate table, and the cover plate, the substrate table, or both, has a structure creating a void between the cover plate and the substrate table, the structure comprising a plurality of protrusions arranged between the substrate table and the cover plate. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22)
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Specification