Lithographic apparatus and device manufacturing method
First Claim
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1. An apparatus, comprising:
- a substrate table arranged to hold a substrate during exposure in an immersion lithographic apparatus; and
a cover plate physically separate from the substrate table, the cover plate positioned on top of a surface of the substrate table during exposure, the cover plate configured to provide a surface, facing a projection system of the immersion lithographic apparatus, that is adjacent to and substantially level with the substrate, wherein the cover plate, a surface of the substrate table under the cover plate, or both, has a reflective surface.
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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.
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Citations
25 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; and a cover plate physically separate from the substrate table, the cover plate positioned on top of a surface of the substrate table during exposure, the cover plate configured to provide a surface, facing a projection system of the immersion lithographic apparatus, that is adjacent to and substantially level with the substrate, wherein the cover plate, a surface of the substrate table under the cover plate, or both, has a reflective surface. - View Dependent Claims (2, 3, 4, 5, 6, 7, 21)
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8. 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, the substrate table having a cover plate physically separate from the substrate table, the cover plate positioned on top of a surface of the substrate table during exposure, and the cover plate providing a surface that is adjacent to and substantially level with a surface of the substrate onto which the modulated radiation beam is incident; and reducing a heat transfer to or from the cover plate using a reflective surface of the cover plate, of a surface of the substrate table under the cover plate, or both. - View Dependent Claims (9, 10, 11, 12, 13)
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14. 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 on top of a surface of the substrate table during exposure and providing a surface facing the projection system that is substantially level with and adjacent to the substrate when supported by the substrate table; a thermal insulator to reduce heat transfer to or from the cover plate, wherein the cover plate, a surface of the substrate table under the cover plate, or both, has a reflective surface. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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22. An apparatus, comprising:
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a substrate table arranged 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; a cover plate physically separate and removable from the substrate table, the cover plate positioned outward of the substrate during exposure and the cover plate configured to provide a substantially horizontal surface adjacent to the substrate, wherein the cover plate, a surface of the substrate table under the cover plate, or both, has a reflective surface; and a plurality of protrusions of the substrate table to support the cover plate. - View Dependent Claims (23)
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24. An apparatus, comprising:
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a movable table supporting an object; a projection system to project a modulated radiation beam onto a substrate; a liquid supply system to provide a liquid in a region between the projection system and the table; a cover plate physically separate from the substrate table, the cover plate positioned on top of a surface of the table and outward of the object during exposure, the cover plate configured to provide a substantially horizontal surface at least partly surrounding the object and having a reflective surface; and a plurality of protrusions of the table to support the cover plate thereon. - View Dependent Claims (25)
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Specification