Lithographic apparatus, device manufacturing method, device manufactured thereby, control system, computer program, and computer program product
First Claim
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1. A lithographic projection apparatus, comprising:
- a radiation system constructed and arranged to provide a projection beam of radiation;
a support structure constructed and arranged to support a patterning device, the patterning device constructed and arranged to pattern the projection beam according to a desired pattern;
a substrate table to hold a substrate;
a projection system constructed and arranged to project the patterned beam onto a target portion of the substrate;
wherein the radiation system comprises an illumination system configured to define the intensity distribution of the projection beam, the illumination system comprises a steering device constructed and arranged to individually steer different parts of an incoming radiation beam into different directions to provide a desired angular intensity distribution of the projection beam at the patterning device, said steering device comprising a plurality of discrete reflectors, each for steering a part of the incoming beam, and whose orientation can be controlled individually to direct the corresponding part of the incoming beam into a desired direction.
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Abstract
A lithographic projection system has an illumination system. A plurality of directing elements reflect different sub-beams of an incident projection beam into adjustable, individually controllable directions. By using of re-directing optics any desired spatial intensity distribution of the projection beam can be produced in its cross-sectional plane.
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Citations
23 Claims
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1. A lithographic projection apparatus, comprising:
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a radiation system constructed and arranged to provide a projection beam of radiation;
a support structure constructed and arranged to support a patterning device, the patterning device constructed and arranged to pattern the projection beam according to a desired pattern;
a substrate table to hold a substrate;
a projection system constructed and arranged to project the patterned beam onto a target portion of the substrate;
wherein the radiation system comprises an illumination system configured to define the intensity distribution of the projection beam, the illumination system comprises a steering device constructed and arranged to individually steer different parts of an incoming radiation beam into different directions to provide a desired angular intensity distribution of the projection beam at the patterning device, said steering device comprising a plurality of discrete reflectors, each for steering a part of the incoming beam, and whose orientation can be controlled individually to direct the corresponding part of the incoming beam into a desired direction.- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A device manufacturing method, comprising:
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providing a substrate at least partially with a layer of radiation-sensitive material;
providing at least one projection beam of radiation;
modifying the intensity distribution of the projection beam;
using a patterning device to endow the modified projection beam with a pattern in its cross-section;
projecting the patterned beam of radiation onto a target which comprises at least a part of the radiation-sensitive material, wherein the modification of the intensity distribution of the projection beam includes controlling the direction into which the radiation propagates, wherein the projection beam comprises a plurality of sub-beams, wherein at least some of the sub-beams are steered into different directions using a plurality of discrete reflectors, and wherein the discrete reflectors are individually controlled to direct the corresponding sub-beam into a desired direction. - View Dependent Claims (18, 19, 20, 21, 22, 23)
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Specification