Lithographic apparatus and device manufacturing method
First Claim
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1. A lithographic projection apparatus comprising:
- a substrate table configured to hold a radiation-sensitive substrate;
a projection system configured to project an exposure beam onto a target portion of the substrate;
a liquid supply system configured to at least partly fill a space between the projection system and the substrate table, with a liquid;
a part of a sensor system, the sensor system part capable of being positioned to be illuminated by radiation;
an edge member structure configured to at least partly extend along an edge of the sensor system part and along an edge of the substrate when supported on the substrate table, the edge member structure configured to define a first gap, between the edge member structure and the sensor system part, to receive at least part of the liquid and define a second gap, between the edge member and the substrate when supported on the substrate table, to receive at least part of the liquid; and
an upwardly-facing orifice, located below the first gap, configured to drain liquid entering the first gap.
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Abstract
A lithographic projection apparatus is disclosed in which a space between the projection system and a sensor is filled with a liquid.
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Citations
20 Claims
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1. A lithographic projection apparatus comprising:
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a substrate table configured to hold a radiation-sensitive substrate; a projection system configured to project an exposure beam onto a target portion of the substrate; a liquid supply system configured to at least partly fill a space between the projection system and the substrate table, with a liquid; a part of a sensor system, the sensor system part capable of being positioned to be illuminated by radiation; an edge member structure configured to at least partly extend along an edge of the sensor system part and along an edge of the substrate when supported on the substrate table, the edge member structure configured to define a first gap, between the edge member structure and the sensor system part, to receive at least part of the liquid and define a second gap, between the edge member and the substrate when supported on the substrate table, to receive at least part of the liquid; and an upwardly-facing orifice, located below the first gap, configured to drain liquid entering the first gap. - View Dependent Claims (2, 3, 4, 14, 15, 16, 17, 18, 19, 20)
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5. A device manufacturing method comprising:
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at least partly filling a space between a projection system of a lithographic apparatus and an object on a substrate table, with a liquid; projecting radiation onto a part of a sensor system, wherein an edge member structure at least partly extends along an edge of the sensor system part and along an edge of a radiation-sensitive substrate, the edge member structure configured to define a first gap, between the edge member structure and the sensor system part, to receive at least part of the liquid and define a second gap, between the edge member and the substrate, to receive at least part of the liquid; draining liquid entering the first gap using an orifice located below the first gap; and projecting an exposure beam of radiation using the projection system through the liquid onto a target portion of the substrate.
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6. A lithographic projection apparatus comprising:
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a movable table; a projection system configured to project an exposure beam onto a target portion of a radiation-sensitive substrate; a liquid supply system configured to at least partly fill a space between the projection system and the table, with a liquid; a sensor system part of the table, the sensor system part capable of being positioned to be illuminated by radiation from a part of a measurement system located above the table; an edge member structure on the table, the edge member structure configured to at least partly extend along an edge of the sensor system part and to define a gap, between the edge member structure and the sensor system part, to receive at least part of the liquid, wherein the edge member structure is movable relative to the movable table; and an upwardly-facing orifice, located below the gap, configured to drain liquid entering the gap. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13)
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Specification