Lithographic apparatus and device manufacturing method
First Claim
1. A lithographic apparatus having at least one optical column, the optical column comprising:
- a programmable patterning device configured to provide a plurality of radiation beams;
a projection system configured to project the plurality of beams onto a substrate, the projection system comprising a plurality of lenses;
a first actuator system, configured to move at least one of the lenses in a direction perpendicular to the optical axis of the projection system to scan the plurality of beams over a target portion of the substrate;
a radiation beam expander, configured to project an image of the programmable patterning device onto the at least one lens;
a second actuator system, configured to move the radiation beam expander in a direction parallel to the optical axis of the projection system; and
a control system configured to control the second actuator system in order to control a focus between the substrate and the at least one lens to a certain position.
1 Assignment
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Accused Products
Abstract
A system to control the focus of a mask-less lithographic apparatus, the apparatus including a projection system to project an image of a programmable patterning device onto a substrate. A first actuator system is configured to move at least one of the lenses of the projection system in a direction perpendicular to the optical axis of the projection system. A radiation beam expander is configured to project an image of the programmable patterning device onto the at least one lens. A second actuator system is configured to move the radiation beam expander in a direction parallel to the optical axis of the projection system in order to control the focus of the image projected onto the substrate.
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Citations
18 Claims
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1. A lithographic apparatus having at least one optical column, the optical column comprising:
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a programmable patterning device configured to provide a plurality of radiation beams; a projection system configured to project the plurality of beams onto a substrate, the projection system comprising a plurality of lenses; a first actuator system, configured to move at least one of the lenses in a direction perpendicular to the optical axis of the projection system to scan the plurality of beams over a target portion of the substrate; a radiation beam expander, configured to project an image of the programmable patterning device onto the at least one lens; a second actuator system, configured to move the radiation beam expander in a direction parallel to the optical axis of the projection system; and a control system configured to control the second actuator system in order to control a focus between the substrate and the at least one lens to a certain position. - 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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creating a pattern on a target portion of a substrate using at least one optical column having a programmable patterning device configured to provide a plurality of radiation beams and a projection system configured to project the plurality of beams onto the target portion, the projection system comprising a plurality of lenses; moving at least one of the lenses in a direction perpendicular to the optical axis of the projection system to scan the plurality of beams over the target portion; using a radiation beam expander to project an image of the programmable patterning device onto the at least one lens; and controlling the position of the radiation beam expander in a direction parallel to the optical axis of the projection system in order to control focus of the image formed on the substrate to a certain position. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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Specification