Lithographic apparatus and device manufacturing method
First Claim
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1. A lithographic apparatus, comprising:
- a substrate table configured to hold a substrate;
a projection system configured to project a patterned beam of radiation onto a target portion of the substrate;
a first liquid supply system configured to at least partially fill a space between a final element of the projection system and the substrate table, with a first liquid; and
a measurement system configured to measure a location of each of a plurality of points on the substrate, the measurement system being arranged such that measurements take place through a second liquid, the second liquid not being supplied by the first liquid supply system.
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Abstract
An immersion lithography apparatus is disclosed having a liquid supply system configured to at least partially fill a space between a final element of a projection system and a substrate table, with a first liquid, and a measurement system configured to measure a location of each of a plurality of points on the substrate, the measurement system being arranged such that measurements take place through a second liquid, the second liquid not being supplied by the liquid supply system.
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Citations
31 Claims
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1. A lithographic apparatus, comprising:
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a substrate table configured to hold a substrate; a projection system configured to project a patterned beam of radiation onto a target portion of the substrate; a first liquid supply system configured to at least partially fill a space between a final element of the projection system and the substrate table, with a first liquid; and a measurement system configured to measure a location of each of a plurality of points on the substrate, the measurement system being arranged such that measurements take place through a second liquid, the second liquid not being supplied by the first liquid supply system. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A device manufacturing method, comprising:
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measuring, through a first liquid, a location of each of a plurality of points on a substrate, the first liquid not being supplied by a liquid supply system configured to at least partially fill a space between the substrate and a final element of the projection system with a second liquid; and projecting a patterned beam of radiation, through second liquid supplied between the substrate and the projection system, onto a target portion of the substrate.
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23. A lithographic apparatus, comprising:
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a substrate table configured to hold a substrate; a projection system configured to project a patterned beam of radiation onto a target portion of the substrate, the projection system configured to project the patterned beam at an exposure station; a measurement system configured to measure a location of each of a plurality of points on the substrate using a measurement beam, the measurement system configured to measure the location of each of the plurality of points at a measurement station displaced from the exposure station, the substrate table being movable between the exposure and measurement stations and arranged not to be simultaneously in the path of the projection beam and the measurement beam; and a liquid supply system configured to at least partially fill a space between a final element of the projection system and the substrate table and a space between a final element of the measurement system and the substrate table with a liquid. - View Dependent Claims (24, 25, 26, 27, 28, 29, 30, 31)
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Specification