Lithographic projection apparatus and a device manufacturing method using such lithographic projection apparatus
DCFirst Claim
1. Lithographic projection apparatus comprising:
- a support structure configured to hold a patterning device to impart a selected pattern to a beam of radiation;
a substrate table configured to hold a substrate;
a projection system configured to project the patterned beam onto a target portion of the substrate to form an image;
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 the image for the 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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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. Adjustments may therefore be determined optimally for a given application.
33 Citations
12 Claims
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1. Lithographic projection apparatus comprising:
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a support structure configured to hold a patterning device to impart a selected pattern to a beam of radiation; a substrate table configured to hold a substrate; a projection system configured to project the patterned beam onto a target portion of the substrate to form an image; 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 the image for the 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification