Lithographic apparatus and device manufacturing method
First Claim
1. A lithographic apparatus, comprising:
- an illumination system that supplies beams of radiation;
patterning systems that pattern the beams, each patterning system comprising an array of individually controllable elements;
projection systems that project the patterned beams onto target portions of a substrate, the patterning systems comprising an array of lenses, such that each lens in the array directs a respective part of a respective one of the patterned beams towards the substrate; and
a displacement system that causes relative displacement between the substrate and the projection systems, such that the beams are scanned across the substrate in a predetermined scanning direction, wherein the projection systems are positioned to allow each beam to be scanned along a respective one of a series of overlapping tracks on the substrate, such that each track comprises, a first portion that is scanned by only one of the patterned beams, and at least one second portion that overlaps an adjacent track to the track and is scanned by two of the patterned beams.
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Accused Products
Abstract
A lithographic apparatus and method for exposing a substrate. An illumination system supplies a series of beams of radiation that are patterned by an array of individually controllable elements. The patterned beams are projected through arrays of lenses onto target portions of a substrate. Each lens in the arrays directs a respective part of the patterned beam towards the substrate. A displacement system causes relative displacement between the substrate and the beam, such that the beams are scanned across the substrate in a predetermined scanning direction. The projection systems are positioned so that each beam is scanned along a respective one of a series of tracks on the substrate. The tracks overlap so that each track comprises a first portion that is scanned by one beam and at least one second portion that overlaps an adjacent track, and is scanned by two beams. A maximum intensity of a first part of each beam directed towards a first portion of the track can be greater than a maximum intensity of a second part of that beam directed towards a second portion of the track, such that the first and second portions of the track are exposed to radiation of substantially the same maximum intensity. Such overlapping of adjacent beams and modulation of the intensity of the beams can allow the optical footprints of different optical columns to be seamed together to enable exposure of large area substrates in a single scan.
29 Citations
21 Claims
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1. A lithographic apparatus, comprising:
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an illumination system that supplies beams of radiation;
patterning systems that pattern the beams, each patterning system comprising an array of individually controllable elements;
projection systems that project the patterned beams onto target portions of a substrate, the patterning systems comprising an array of lenses, such that each lens in the array directs a respective part of a respective one of the patterned beams towards the substrate; and
a displacement system that causes relative displacement between the substrate and the projection systems, such that the beams are scanned across the substrate in a predetermined scanning direction, wherein the projection systems are positioned to allow each beam to be scanned along a respective one of a series of overlapping tracks on the substrate, such that each track comprises, a first portion that is scanned by only one of the patterned beams, and at least one second portion that overlaps an adjacent track to the track and is scanned by two of the patterned beams. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A device manufacturing method, comprising:
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patterning beams of radiation with respective arrays of individually controllable elements;
projecting the patterned beams onto target portions of a substrate;
causing relative displacement between the substrate and the patterned beams, such that the patterned beams are scanned across the substrate in a predetermined scanning direction;
directing each respective one of the patterned beams towards the substrate through an array of lenses, each lens in the array directing a respective part of the patterned beams;
scanning each respective patterned beam a respective one of a series of tracks on the substrate; and
overlapping the tracks, such that each of the tracks comprises a first portion that is scanned by only one of the patterned beams and at least one second portion that overlaps an adjacent one of the tracks and is scanned by two of the patterned beams. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21)
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Specification