MOVABLE BODY SYSTEM, MOVABLE BODY DRIVE METHOD, PATTERN FORMATION APPARATUS, PATTERN FORMATION METHOD, EXPOSURE APPARATUS, EXPOSURE METHOD, AND DEVICE MANUFACTURING METHOD
First Claim
1. A movable body system, the system comprising:
- a movable body which substantially moves along a predetermined plane;
a measurement device having a plurality of encoder heads provided on a surface of the movable body, and measures positional information of the movable body, based on an output of at least one encoder head which faces a grating section placed parallel with the predetermined plane outside the movable body; and
a drive device which drives the movable body based on the positional information measured by the measurement device, and information on a relative position between an encoder head used in the measurement of the positional information and the movable body.
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Accused Products
Abstract
A plurality of heads configuring an encoder system is arranged on a wafer table, and positional information of a wafer table in the XY plane is measured, based on an output of a head opposed to a scale plate (diffraction grating). And, a relative position (including relative attitude and rotation) of each head with the wafer table is measured herein by a measurement system arranged inside the head. Accordingly, by correcting the positional information based on the information of the relative position which has been measured, a highly precise measurement of the positional information of the wafer table becomes possible even in the case when the position (attitude, rotation) of the head changes with the movement of the wafer table.
98 Citations
21 Claims
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1. A movable body system, the system comprising:
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a movable body which substantially moves along a predetermined plane; a measurement device having a plurality of encoder heads provided on a surface of the movable body, and measures positional information of the movable body, based on an output of at least one encoder head which faces a grating section placed parallel with the predetermined plane outside the movable body; and a drive device which drives the movable body based on the positional information measured by the measurement device, and information on a relative position between an encoder head used in the measurement of the positional information and the movable body. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A movable body drive method, the method comprising:
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a measurement process in which of a plurality of encoder heads provided on a surface of a movable body that substantially moves along a predetermined plane, positional information of the movable body is measured, based on an output of at least one encoder head which faces a grating section placed parallel with the predetermined plane outside the movable body; and a drive process in which the movable body is driven, based on the positional information that has been measured, and information on a relative position between an encoder head used in the measurement of the positional information and the movable body. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21)
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Specification