Lithographic apparatus and device manufacturing method
First Claim
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1. A lithographic projection apparatus comprising:
- a projection system arranged to project a beam of radiation onto a substrate;
a liquid supply system configured to supply liquid to a space between the projection system and a movable table; and
a same detector configured to detect at least part of the liquid remaining on an object to produce a first output representing a first parameter about the liquid and configured to make a measurement to produce a second output separate from the first output, the second output representing a second parameter separate from the first parameter about the liquid.
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Abstract
In immersion lithography after exposure of a substrate is complete, a detector is used to detect any residual liquid remaining on the substrate and/or substrate table.
155 Citations
21 Claims
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1. A lithographic projection apparatus comprising:
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a projection system arranged to project a beam of radiation onto a substrate; a liquid supply system configured to supply liquid to a space between the projection system and a movable table; and a same detector configured to detect at least part of the liquid remaining on an object to produce a first output representing a first parameter about the liquid and configured to make a measurement to produce a second output separate from the first output, the second output representing a second parameter separate from the first parameter about the liquid. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A device manufacturing method comprising:
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projecting, using a projection system of a lithographic apparatus, a beam of radiation through a liquid onto a substrate; detecting, using a detector, residual liquid on an object of the lithographic apparatus, the detecting producing a first output representing a first parameter about the liquid; and using the same detector to make a measurement to produce a second output separate from the first output, the second output representing a second parameter separate from the first parameter about the liquid. - View Dependent Claims (11, 12, 13, 14)
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15. A lithographic projection apparatus comprising:
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a projection system arranged to project a beam of radiation onto a substrate; a liquid supply system configured to supply liquid to a space between the projection system and a movable table; and a sensor system configured to determine a position and/or orientation of the substrate, the sensor system further configured to detect at least part of the liquid on an object, wherein the sensor system uses a same detector to make a measurement to produce a first output to yield a first parameter representing the position and/or orientation of the substrate and make a measurement to produce a second output separate from the first output, the second output arranged to yield a second parameter, separate from the first parameter, representing detection of the at least part of the liquid on the object. - View Dependent Claims (16, 17, 18, 19, 20, 21)
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Specification