Lithographic apparatus and device manufacturing method
First Claim
1. A lithographic apparatus comprising:
- a substrate table configured to hold a substrate;
a projection system configured to project a patterned beam onto a target portion of the substrate; and
a displacement measuring system configured to measure a position of said substrate table, wherein said displacement measuring system comprises at least one encoder type x-sensor mounted on said substrate table and configured to measure the position of the substrate table in a first direction with respect to two or more substantially stationary adjacent grid plates, said displacement measuring system being configured to continuously measure the position of said substrate table when crossing a crossing line between said two or more adjacent grid plates.
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Accused Products
Abstract
A lithographic apparatus includes a displacement measuring system configured to measure the position of a substrate table in at least three degrees of freedom. The displacement measuring system includes a first x-sensor configured to measure the position of the substrate table in a first direction and a first and a second y-sensor configured to measure the position of the substrate table in a second direction. Said displacement measuring system further comprises a second x-sensor. The first and second x-sensor and first and second y-sensors are encoder type sensors configured to measure the position of each of the sensors with respect to at least one grid plate. The displacement measuring system is configured to selectively use, depending on the position of the substrate table, three of the first and second x-sensors and the first and second y-sensors to determine the position of the substrate table in three degrees of freedom.
53 Citations
23 Claims
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1. A lithographic apparatus comprising:
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a substrate table configured to hold a substrate; a projection system configured to project a patterned beam onto a target portion of the substrate; and a displacement measuring system configured to measure a position of said substrate table, wherein said displacement measuring system comprises at least one encoder type x-sensor mounted on said substrate table and configured to measure the position of the substrate table in a first direction with respect to two or more substantially stationary adjacent grid plates, said displacement measuring system being configured to continuously measure the position of said substrate table when crossing a crossing line between said two or more adjacent grid plates. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A lithographic apparatus comprising:
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a substrate table configured to hold a substrate; a projection system configured to project a patterned beam onto a target portion of the substrate; and a displacement measuring system configured to measure the position of said substrate table in six degrees of freedom (x, y, z, Rx, Ry, Rz), wherein said displacement measuring system comprises; one x-sensor configured to measure the position of the substrate table in a first direction, two y-sensors configured to measure the position of the substrate table in a second direction, and three z-sensors configured to measure the position of the substrate table in a third direction, wherein said displacement measuring system further comprises a second x-sensor and a fourth z-sensor, wherein said first and said second x-sensor and said first and second y-sensors are encoder type sensors configured to cooperate with respect to two or more separate grid plates, said displacement measuring system being configured to selectively use, depending on the position of said substrate table with respect to the two or more separate grid plates, three of said first and second x-sensors and said first and second y-sensors and three of said z-sensors to continuously determine the position of said substrate table in six degrees of freedom when the substrate table crosses a space between the two or more separate grid plates.
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18. A device manufacturing method comprising:
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projecting a patterned beam of radiation onto a substrate, wherein said substrate is supported on a substrate table at least during projecting a patterned beam onto a target portion of the substrate; and measuring a position of said substrate table, the measuring including measuring the position of said substrate table in a first direction with respect to two or more substantially stationary adjacent grid plates using at least one encoder-type sensor mounted on said substrate table, the measuring further including continuously measuring the position of said substrate table when crossing a crossing line between said two or more adjacent grid plates. - View Dependent Claims (19, 20, 21, 22, 23)
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Specification