Lithographic projection apparatus and a device manufacturing method using such lithographic projection apparatus
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Abstract
A lithographic projection apparatus is disclosed that includes a predictive system configured to predict changes in projection system aberrations with time with respect to measured aberration values, a modelling system configured to determine an application-specific effect of said predicted projection system aberration changes on at least one parameter of an image for a selected pattern, a control system configured to generate a control signal specific to the selected pattern according to said predicted projection system aberration changes and their application-specific effect on the at least one parameter of the image, and an image adjusting system, responsive to the control signal, to compensate for the application-specific effect of said predicted projection system aberration changes on the image.
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Citations
35 Claims
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1-12. -12. (canceled)
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13. A device manufacturing method using a lithographic projection apparatus, the method comprising:
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illuminating a patterning device for a desired patterning application, with a beam of radiation to produce a patterned beam; projecting the patterned beam onto a target portion to form an image thereon; predicting changes in projection aberrations with time with respect to measured aberration values; determining an application-specific effect of said predicted projection aberration changes on at least one parameter of the image; generating a control signal specific to the desired patterning application according to said predicted projection system aberration changes and their application-specific effect; and adjusting the imaging based on the control signal. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 34, 35)
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23. A machine readable medium encoded with machine executable instructions for performing a method, the method comprising:
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predicting changes in projection aberrations with time with respect to measured aberration values for a desired patterning application on a lithographic projection apparatus; determining an application-specific effect of said predicted projection aberration changes on at least one parameter of an image; generating a control signal specific to the desired patterning application according to said predicted projection system aberration changes and their application-specific effect; and adjusting the imaging based on the control signal. - View Dependent Claims (24, 25, 26, 27, 28, 29, 30, 31, 32)
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33. A method, comprising:
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predicting changes in projection system aberrations with time with respect to measured aberration values; determining an application-specific effect of the predicted projection system aberration changes on a parameter of an image of a pattern; generating a control signal specific to the pattern according to the predicted projection system aberration changes and their application-specific effect on the parameter of the image; and based on the control signal, compensating for the application-specific effect of the predicted projection system aberration changes on the image.
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Specification