Lithographic apparatus and device manufacturing method
First Claim
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1. A lithographic apparatus, comprising:
- an illumination system that supplies a projection beam of radiation;
an array of individually controllable elements that pattern the projection beam;
a projection system that projects the patterned beam onto a target proportion of a substrate; and
a controller that limits a proportion of the array of individually controllable elements that is used to generate the patterned beam for at least one of a plurality of sub-exposures that are used to expose a repeating pattern on the substrate, such that a sum of sizes of said sub-exposures, in a given direction, equals a size of the repeating pattern exposed on the substrate, in said direction.
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Abstract
A system and method are used to limit a proportion of a programmable patterning means used to pattern a substrate. This is done such that a size of a repeated pattern to be exposed on the substrate is an integer multiple of a size of a pattern exposed on the substrate by the patterned beam.
26 Citations
20 Claims
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1. A lithographic apparatus, comprising:
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an illumination system that supplies a projection beam of radiation;
an array of individually controllable elements that pattern the projection beam;
a projection system that projects the patterned beam onto a target proportion of a substrate; and
a controller that limits a proportion of the array of individually controllable elements that is used to generate the patterned beam for at least one of a plurality of sub-exposures that are used to expose a repeating pattern on the substrate, such that a sum of sizes of said sub-exposures, in a given direction, equals a size of the repeating pattern exposed on the substrate, in said direction. - View Dependent Claims (2, 3, 4, 5, 6, 8, 9, 10, 11, 12, 13)
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7. The lithographic projection apparatus of 1, wherein the controller limits the proportion of the array of individually controllable elements used by setting a pattern on a proportion of the array of individually controllable elements, such that there is substantially no radiation in the corresponding proportion of the patterned beam.
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14. The lithographic projection apparatus of 1, wherein said controller comprises:
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a device that identifies regions of the array of individually controllable elements having faults, wherein when the controller is limiting the proportion of the array of individually controllable elements used, the controller minimizes the number of faults in the proportion of the array of individually controllable elements that is used.
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15. A device manufacturing method, comprising:
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patterning a projection beam using an array of individually controllable elements;
projecting the patterned projection beam at a target proportion of a substrate; and
limiting a proportion of the array of individually controllable elements that is used to generate the patterned projection beam for at least one of a plurality of sub-exposures that are used to expose a repeating pattern on the substrate. - View Dependent Claims (16, 17)
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18. A computer program product for controlling a lithographic apparatus comprising a computer useable medium having a computer program logic recorded thereon for controlling at least one processor, the computer program logic comprising:
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computer program code means for patterning a projection beam using an array of individually controllable elements;
computer program code means for projecting the patterned projection beam at a target proportion of a substrate; and
computer program code means for causing the lithographic apparatus to limit a proportion of the array of individually controllable elements that is used to generate a patterned beam of radiation for at least one of a plurality of sub-exposures that are used to expose a repeating pattern on a substrate. - View Dependent Claims (19, 20)
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Specification