Position resolution of an interferometrially controlled moving stage by regression analysis
First Claim
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1. A method of achieving high position resolution in a precision motion system having at least one moving stage, comprising the steps of:
- measuring a series of positions of said at least one moving stage; and
estimating a present position of said at least one moving stage using a selected number of the series of measured positions of said at least one moving stage.
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Abstract
A method and apparatus for achieving high position resolution of a moving stage in a lithographic system utilized for the manufacture of semiconductor integrated circuits. A series of values of the stage position are measured using an interferometric system, and a present position of the stage is estimated using regression analysis applied to a selected number of the series of measured values. The resulting predicted position is of higher resolution than a single stage position measurement of the interferometric system.
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Citations
63 Claims
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1. A method of achieving high position resolution in a precision motion system having at least one moving stage, comprising the steps of:
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measuring a series of positions of said at least one moving stage; and estimating a present position of said at least one moving stage using a selected number of the series of measured positions of said at least one moving stage. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 61)
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19. An apparatus for achieving high position resolution, comprising:
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at least one moving stage; a first measurement system located to measure a series of positions of said at least one moving stage; and an estimation system connected to said first measurement system to estimate a present position of said at least one moving stage using a selected number of the series of measured positions of said at least one moving stage. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 62)
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40. An apparatus for achieving high position resolution, comprising:
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at least one moving stage; means for measuring a series of positions of said at least one moving stage; and means for estimating a present position of said at least one moving stage using a selected number of the series of measured positions of said at least one moving stage. - View Dependent Claims (41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 63)
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Specification