Lithographic apparatus, device manufacturing method and displacement measurement system
First Claim
1. A lithographic apparatus comprising:
- a support structure constructed to support a patterning device, the patterning device being capable of imparting a radiation beam with a pattern to form a patterned radiation beam;
a substrate table constructed to hold a substrate;
a projection system configured to project the patterned radiation beam onto a target portion of the substrate; and
a displacement measuring system arranged to determine a position quantity of a moveable object,wherein the moveable object comprises one of the support structure and the substrate table,wherein the displacement measuring system comprises an encoder and a grid structure,wherein one of the encoder and the grid structure is connected to the moveable object,wherein the grid structure comprises a high precision grid portion and a low precision grid portion,wherein the encoder is arranged to cooperate with the high precision grid portion to determine the position quantity relative to the grid structure with a high precision,wherein the encoder is arranged to cooperate with the low precision grid portion to determine the position quantity relative to the grid structure with a low precision, andwherein the high precision grid portion is provided closer to the projection system than the low precision grid portion.
1 Assignment
0 Petitions
Accused Products
Abstract
A lithographic apparatus including a moveable object (WT) and a displacement measuring system arranged to determine a position quantity of the moveable object. The displacement measuring system includes an encoder (BC) and a grid structure. One of the encoder and the grid structure is connected to the moveable object. The grid structure includes a high precision grid portion (HG) and a low precision grid portion (LG). The encoder is arranged to cooperate with the high precision grid portion to determine the position quantity relative to the grid structure with a high precision. The encoder is arranged to cooperate with the low precision grid portion to determine the position quantity relative to the grid structure with a low precision.
-
Citations
11 Claims
-
1. A lithographic apparatus comprising:
-
a support structure constructed to support a patterning device, the patterning device being capable of imparting a radiation beam with a pattern to form a patterned radiation beam; a substrate table constructed to hold a substrate; a projection system configured to project the patterned radiation beam onto a target portion of the substrate; and a displacement measuring system arranged to determine a position quantity of a moveable object, wherein the moveable object comprises one of the support structure and the substrate table, wherein the displacement measuring system comprises an encoder and a grid structure, wherein one of the encoder and the grid structure is connected to the moveable object, wherein the grid structure comprises a high precision grid portion and a low precision grid portion, wherein the encoder is arranged to cooperate with the high precision grid portion to determine the position quantity relative to the grid structure with a high precision, wherein the encoder is arranged to cooperate with the low precision grid portion to determine the position quantity relative to the grid structure with a low precision, and wherein the high precision grid portion is provided closer to the projection system than the low precision grid portion. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
-
-
9. A lithographic apparatus comprising:
-
a moveable object; and a displacement measuring system arranged to determine a position quantity of the moveable object, wherein the displacement measuring system comprises an encoder and a grid structure, wherein one of the encoder and the grid structure is connected to the moveable object, wherein the grid structure comprises a high precision grid portion and a low precision grid portion, wherein the encoder is arranged to cooperate with the high precision grid portion to determine the position quantity relative to the grid structure with a high precision, wherein the encoder is arranged to cooperate with the low precision grid portion to determine the position quantity relative to the grid structure with a low precision, and wherein the displacement measuring system comprises a further encoder, wherein the grid structure has a border between the high precision grid portion and the low precision grid portion, wherein the encoder and the further encoder are arranged at an offset relative to each other in a direction such that when one of the encoder and the further encoder faces the border, the other of the encoder and the further encoder cooperates with one of the high precision grid portion and the low precision grid portion. - View Dependent Claims (10)
-
-
11. A device manufacturing method for transferring a pattern from a patterning device onto a substrate using a lithographic apparatus, wherein the lithographic apparatus comprises a moveable object and a projection system configured to project a patterned radiation beam onto a target portion of a substrate, the method comprising:
-
moving the moveable object, providing a grid structure comprising a high precision grid portion and a low precision grid portion, providing the high precision rid portion closer to the projection system than the low precision grid portion, measuring with an encoder a position quantity of the moveable object with a high precision relative to the high precision grid portion, and measuring with the encoder the position quantity of the moveable object with a low precision relative to the low precision grid portion.
-
Specification