Lithographic apparatus and device manufacturing method
First Claim
Patent Images
1. A lithographic apparatus comprising:
- an optical column capable of projecting a beam on a target portion of a substrate, the optical column having;
a self emissive contrast device configured to emit the beam, anda projection system configured to project the beam onto the target portion,the projection system comprising an optical element;
an actuator to move at least part of the optical column including the optical element with respect to the substrate;
a surface facing a radiation receiving or transmitting surface of the optical element and with respect to which the radiation receiving or transmitting surface of the optical element is movable, the surface being within about 2 cm from the radiation receiving or transmitting surface of the optical element; and
a control system configured to cause the self emissive contrast device to modulate emission of the beam during projection and to cause the actuator to move the optical element during projection with respect to the surface.
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Abstract
A lithographic apparatus having an optical column capable of creating a pattern on a target portion of a substrate is disclosed. The optical column may have a self-emissive contrast device configured to emit a beam, and a projection system configured to project the beam onto the target portion. The apparatus may also have an actuator to move the optical column or a part thereof with respect to the substrate. The apparatus may be constructed to reduce the optical effect of density variation in a medium around the moving part of the optical column on the beam.
84 Citations
20 Claims
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1. A lithographic apparatus comprising:
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an optical column capable of projecting a beam on a target portion of a substrate, the optical column having; a self emissive contrast device configured to emit the beam, and a projection system configured to project the beam onto the target portion, the projection system comprising an optical element; an actuator to move at least part of the optical column including the optical element with respect to the substrate; a surface facing a radiation receiving or transmitting surface of the optical element and with respect to which the radiation receiving or transmitting surface of the optical element is movable, the surface being within about 2 cm from the radiation receiving or transmitting surface of the optical element; and a control system configured to cause the self emissive contrast device to modulate emission of the beam during projection and to cause the actuator to move the optical element during projection with respect to the surface. - 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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emitting a beam with a self emissive contrast device; projecting the beam onto a target portion of a substrate using a projection system, the projection system comprising an optical element; causing the self emissive contrast device to modulate emission of the beam during projection; and during projection, moving the optical element with respect to the substrate and with respect to a surface facing a radiation receiving or transmitting surface of the optical element, the surface being within about 2 cm from the radiation receiving or transmitting surface of the optical element. - View Dependent Claims (11, 12, 13, 14)
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15. A lithographic apparatus comprising:
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a self emissive contrast device configured to emit a beam; a projection system configured to project the beam onto a target surface of a substrate, the projection system comprising an optical element; a substantially gas-tight compartment enclosing at least the optical element, wherein the self emissive contrast device and the substrate are outside the compartment; an actuator to move the optical element with respect to the substrate; and a control system configured to cause the self emissive contrast device to modulate emission of the beam during projection and to cause the actuator to move the optical element during projection with respect to the compartment. - View Dependent Claims (16, 17, 18, 19)
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20. A lithographic apparatus comprising:
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a table to support a substrate; a self emissive contrast device configured to emit a beam; a projection system configured to project the beam onto a target portion of the substrate, the projection system comprising an optical element mounted on a movable frame; an actuator to move the optical element with respect to the substrate; a control system configured to cause the self emissive contrast device to modulate emission of the beam during projection and to cause the actuator to move the optical element during projection; and a covering displaced from the table, the covering having a generally U shape into which at least the optical element extends, at least part of the frame being outside of the U shape of the covering and arranged to cause the optical element to laterally move within or through the U shape.
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Specification