Exposure method, exposure apparatus, and device manufacturing method
First Claim
1. An exposure apparatus which exposes an object, the apparatus comprising:
- a movable body which holds an object and moves along a predetermined plane;
a position measurement system which obtains positional information of the movable body based on an output of a head which irradiates a measurement beam on a measurement plane placed roughly parallel to the predetermined plane external to the movable body in the vicinity of an exposure position to the object, and receives a return beam from the measurement plane, a plurality of heads being provided on the movable body and the head being one of the plurality of heads; and
a control system which drives the movable body based on the positional information obtained by the position measurement system, and switches a head which the position measurement system uses to obtain the positional information out of the plurality of heads according to the position of the movable body, whereinthe control system corrects a reciprocal displacement between a plurality of reference coordinate systems corresponding to the plurality of heads, within a first movement area of the movable body where the plurality of heads face the measurement plane.
1 Assignment
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Accused Products
Abstract
Within area where of four heads installed on a wafer stage, heads included in the first head group and the second head group to which three heads each belong that include one head different from each other face the corresponding areas on a scale plate, the wafer stage is driven based on positional information which is obtained using the first head group, as well as obtain the displacement (displacement of position, rotation, and scaling) between the first and second reference coordinate systems corresponding to the first and second head groups using the positional information obtained using the first and second head groups. By using the results and correcting measurement results obtained using the second head group, the displacement between the first and second reference coordinate systems is calibrated, which allows the measurement errors that come with the displacement between areas on scale plates where each of the four heads face.
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Citations
31 Claims
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1. An exposure apparatus which exposes an object, the apparatus comprising:
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a movable body which holds an object and moves along a predetermined plane; a position measurement system which obtains positional information of the movable body based on an output of a head which irradiates a measurement beam on a measurement plane placed roughly parallel to the predetermined plane external to the movable body in the vicinity of an exposure position to the object, and receives a return beam from the measurement plane, a plurality of heads being provided on the movable body and the head being one of the plurality of heads; and a control system which drives the movable body based on the positional information obtained by the position measurement system, and switches a head which the position measurement system uses to obtain the positional information out of the plurality of heads according to the position of the movable body, wherein the control system corrects a reciprocal displacement between a plurality of reference coordinate systems corresponding to the plurality of heads, within a first movement area of the movable body where the plurality of heads face the measurement plane. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An exposure apparatus which exposes an object, the apparatus comprising:
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a movable body which holds the object and moves along a predetermined plane; a position measurement system which obtains positional information of the movable body based on an output of a head which irradiates a measurement beam on a measurement plane made up of a plurality of scale plates that is placed roughly parallel to the predetermined plane external to the movable body in the vicinity of an exposure position to the object, and receives a return beam from the measurement plane, a plurality of heads being provided on the movable body and the head being one of the plurality of heads; and a control system which drives the movable body based on the positional information obtained by the position measurement system, and switches a head which the position measurement system uses to obtain the positional information out of the plurality of heads according to the position of the movable body, wherein the control system obtains a reciprocal positional relation between the plurality of scale plates corresponding to the plurality of heads, within a first movement area of the movable body where the plurality of heads face the measurement plane. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. An exposure method in which an object is exposed, the method comprising:
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obtaining a positional relation in a first movement area of a movable body which moves along a predetermined plane, a plurality of heads being provided on the movable body, the plurality of heads comprising a plurality of head groups, each of the plurality of head groups comprising a plurality of heads including at least one head different from each other, the plurality of head groups facing a measurement plane made up of a plurality of scale plates placed roughly in parallel with the predetermined plane outside of the movable body, the positional relation being a reciprocal positional relation between the plurality of scale plates respectively corresponding to the plurality of head groups; and exposing an object held by the movable body by obtaining positional information of the movable body using a plurality of heads belonging to each of the plurality of head groups, and driving the movable body using the positional information and the reciprocal positional relation between the plurality of scale plates respectively corresponding to the plurality of head groups within the first movement area. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29)
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30. A making method of an exposure apparatus which exposes an object, the method comprising:
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providing a movable body which holds the object and moves along a predetermined plane; providing a position measurement system which obtains positional information of the movable body based on an output of a head which irradiates a measurement beam on a measurement plane placed roughly parallel to the predetermined plane external to the movable body in the vicinity of an exposure position to the object, and receives a return beam from the measurement plane, of a plurality of heads provided on the movable body; and providing a control system which drives the movable body based on the positional information obtained by the position measurement system, as well as switches a head used by the position measurement system to obtain the positional information from the plurality of heads according to the position of the movable body, and corrects a reciprocal displacement between a plurality of reference coordinate systems corresponding to the plurality of heads, within a first movement area of the movable body where the plurality of heads face the measurement plane.
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31. A making method of an exposure apparatus which exposes an object, the method comprising:
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providing a movable body which holds the object and moves along a predetermined plane; providing a position measurement system which obtains positional information of the movable body based on an output of a head which irradiates a measurement beam on a measurement plane made up of a plurality of scale plates that is placed roughly parallel to the predetermined plane external to the movable body in the vicinity of an exposure position to the object, and receives a return beam from the measurement plane, of a plurality of heads provided on the movable body; and providing a control system which drives the movable body based on the positional information obtained by the position measurement system, as well as switches a head used by the position measurement system to obtain the positional information from the plurality of heads according to the position of the movable body, and obtains a reciprocal positional relation between a plurality of scale plates corresponding to the plurality of heads, within a first movement area of the movable body where the plurality of heads face the measurement plane.
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Specification