Lithographic apparatus and device manufacturing method
First Claim
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1. A lithographic projection apparatus comprising:
- a support 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 to at least partly fill a space between said projection system and said substrate, with a liquid through which said beam is to be projected; and
an isolator, having at least a portion to allow passage of said beam therethrough, provided between said projection system and said substrate table and mechanically isolated from said projection system.
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Abstract
In an immersion lithography apparatus, an isolator is provided between the substrate table and the projection system to, for example, prevent currents in the liquid exerting forces on the projection system that might tend to distort the reference frame to which said projection system is connected. The isolator may be maintained still relative to the reference frame by an actuator system responsive to a position sensor mounted on the reference frame. At least a portion of the isolator may have the same refractive index as the liquid.
1011 Citations
41 Claims
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1. A lithographic projection apparatus comprising:
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a support 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 to at least partly fill a space between said projection system and said substrate, with a liquid through which said beam is to be projected; and
an isolator, having at least a portion to allow passage of said beam therethrough, provided between said projection system and said substrate table and mechanically isolated from said projection system. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A device manufacturing method comprising:
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providing a liquid to at least partly fill a space between a substrate and a projection system; and
projecting a patterned beam of radiation, through an isolator mechanically isolated from said projection system between said substrate and said projection system and through said liquid, onto a target portion of the substrate. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
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31. A lithographic projection apparatus comprising:
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a support configured to hold a patterning device, the patterning device configured to pattern a beam of radiation according to a desired pattern;
a movable 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 to provide a first liquid portion through which the patterned beam can be projected, said substrate table capable of imparting a vibration in said first liquid portion and to provide a second liquid portion through which the patterned beam can be projected, said second liquid portion being in contact with said projection system; and
a vibration isolator disposed between said first and second liquid portions to inhibit a vibration in said first liquid portion from being transmitted to said second liquid portion. - View Dependent Claims (32, 33, 34, 35, 36, 37, 38, 39, 40, 41)
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Specification