Lithographic apparatus and device manufacturing method
First Claim
1. An apparatus, comprising:
- a pattern generator configured to emit a patterned beam; and
a projection system configured to project the patterned beam onto a target portion of a substrate and comprising a micro lens array configured to produce image spots on the target portion of the substrate,wherein the pattern generator is driven by a drive signal based on error correction values to vary an intensity of respective ones of the image spots adjacent to respective ones of the image spots manifesting errors caused by the projection system, thereby compensating for the errors in the projection system.
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Accused Products
Abstract
A lithographic apparatus comprises an illumination system for supplying a beam of radiation, a patterning arrangement incorporating an array of individually controllable elements for imparting a pattern to the beam cross-section, a substrate table for supporting a substrate, and a projection system incorporating a microlens array for projecting the beam onto a target portion of the substrate. An error compensator is provided for supplying error correction values for compensating for the effect of positional errors in the microlens array, and a grey scale modulator is provided for supplying drive signals to controllable elements of the patterning arrangement in dependence on the error correction values in order to compensate for the effect of positional errors in the microlens array by varying the intensity of some parts of the pattern relative to other parts of the pattern.
27 Citations
22 Claims
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1. An apparatus, comprising:
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a pattern generator configured to emit a patterned beam; and a projection system configured to project the patterned beam onto a target portion of a substrate and comprising a micro lens array configured to produce image spots on the target portion of the substrate, wherein the pattern generator is driven by a drive signal based on error correction values to vary an intensity of respective ones of the image spots adjacent to respective ones of the image spots manifesting errors caused by the projection system, thereby compensating for the errors in the projection system. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method, comprising:
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producing a patterned beam of radiation using a pattern generator; using a micro lens array to project image spots of the patterned beam of radiation onto a target portion of a substrate; detecting errors in a projection system; and supplying drive signals to the pattern generator based on the detected errors to vary an intensity of respective ones of the image spots adjacent to respective ones of the image spots manifesting errors caused by the projection system, thereby compensating for the effect of the errors in the projection system. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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21. An apparatus, comprising:
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a programmable mirror array configured to emit a patterned beam; and a projection system configured to project image spots of the patterned beam onto a target portion of a substrate, each image spot being based on two or more mirrors from the programmable mirror array, and wherein the programmable mirror array is driven by a drive signal based on error correction values to vary an intensity of the image spots adjacent to the image spots manifesting errors caused by the projection system, thereby compensating for the errors in the projection system.
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22. A method, comprising:
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producing a patterned beam of radiation using a programmable mirror array; projecting image spots of the patterned beam of radiation onto a target portion of a substrate, each image spot being based on two or more mirrors from the programmable mirror array; detecting errors in a projection system; and supplying drive signals to the programmable mirror array based on the detected errors to vary an intensity of the image spots adjacent to the image spots manifesting errors caused by the projection system, thereby compensating for the effect of the errors in the projection system.
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Specification