Lithographic apparatus and device manufacturing method
First Claim
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1. A lithographic projection apparatus comprising:
- a support structure configured to hold a patterning device, the patterning device configured to pattern a beam of radiation according to a desired pattern;
a substrate table configured to hold a substrate;
a projection system configured to project the patterned beam onto a target portion of the substrate;
a liquid supply system configured provide a liquid in a space between the final element of said projection system and said substrate; and
a measurement system configured to measure, not through said liquid, the location of a each of a plurality of points on said substrate.
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Abstract
A map of the surface of a substrate is generated at a measurement station. The substrate is then moved to where a space between a projection lens and the substrate is filled with a liquid. The substrate is then aligned using, for example, a transmission image sensor and, using the previous mapping, the substrate can be accurately exposed. Thus the mapping does not take place in a liquid environment.
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Citations
33 Claims
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1. A lithographic projection apparatus comprising:
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a support structure configured to hold a patterning device, the patterning device configured to pattern a beam of radiation according to a desired pattern;
a substrate table configured to hold a substrate;
a projection system configured to project the patterned beam onto a target portion of the substrate;
a liquid supply system configured provide a liquid in a space between the final element of said projection system and said substrate; and
a measurement system configured to measure, not through said liquid, the location of a each of a plurality of points on said substrate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A device manufacturing method comprising:
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providing a liquid in a space between a final element of a projection system and a substrate;
measuring the location of each of a plurality of points on a substrate using a measurement beam projected from a measurement system but not projected through said liquid; and
projecting a patterned beam of radiation onto a target portion of the substrate using the projection system. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33)
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Specification