Lithographic apparatus and device manufacturing method
First Claim
Patent Images
1. A lithographic apparatus comprising:
- a self-emissive contrast device configured to emit a beam;
a projection system configured to project the beam along an optical path onto a target portion of a substrate, the projection system comprising an optical element;
an actuator to move at least the optical element with respect to the substrate;
a first surface facing and immediately adjacent a radiation receiving surface of the optical element and with respect to which the radiation receiving surface of the optical element is movable, the first surface not having optical power and at least partly overlying the radiation receiving surface;
a second surface facing and immediately adjacent a radiation emitting surface of the optical element and with respect to which the radiation emitting surface of the optical element is movable; 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 in a direction transverse to the optical path of the beam with respect to the first and second surfaces.
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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.
83 Citations
20 Claims
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1. 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 along an optical path onto a target portion of a substrate, the projection system comprising an optical element; an actuator to move at least the optical element with respect to the substrate; a first surface facing and immediately adjacent a radiation receiving surface of the optical element and with respect to which the radiation receiving surface of the optical element is movable, the first surface not having optical power and at least partly overlying the radiation receiving surface; a second surface facing and immediately adjacent a radiation emitting surface of the optical element and with respect to which the radiation emitting surface of the optical element is movable; 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 in a direction transverse to the optical path of the beam with respect to the first and second surfaces. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A device manufacturing method comprising:
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emitting a beam with a self-emissive contrast device; projecting the beam along an optical path 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 (i) with respect to the substrate in a direction transverse to the optical path, (ii) with respect to a first surface facing and immediately adjacent a radiation receiving surface of the optical element, the first surface not having optical power and at least partly overlying the radiation receiving surface, and (iii) with respect to a second surface facing and immediately adjacent a radiation emitting surface of the optical element. - View Dependent Claims (12, 13, 14, 15, 16)
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17. 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 along an optical path onto a target surface of a substrate, the projection system comprising an optical element; an actuator to move at least the optical element with respect to the substrate; a surface facing and immediately adjacent a radiation receiving or emitting surface of the optical element and with respect to which the radiation receiving or emitting surface of the optical element is movable, the surface having an open aperture immediately adjacent the optical element, the aperture having a cross-sectional width smaller than a cross-sectional width 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 (18, 19, 20)
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Specification