Positioning system, a lithographic apparatus and a method for positional control
AssigneeASML Netherlands B.V.
InventorsHans Butler, Henrikus Herman Marie Cox
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Abstract
A positioning system for controlling a relative position between a first component and a second component of a lithographic apparatus, wherein a position of each component is defined by a set of orthogonal coordinates, the positioning system including: a measuring device configured to determine an error in the momentary position of one of the components with respect to a setpoint position in a measurement coordinate; and a controller configured to control movement of the other component in a control coordinate based on the determined error; wherein the measurement coordinate is different from the control coordinate.
Claims8
A positioning system for controlling a relative position between a first component and a second component of a lithographic apparatus, the positioning system comprising:
- a compensatory measuring device configured to determine a compensated error in the momentary position of one of the components with respect to a setpoint position, wherein the compensated error excludes from the actual error an error component due to at least one frequency component of movement of said one of the second component and first component;
- and
- an uncompensatory measuring device configured to determine an uncompensated error in the momentary position of said one of the components with respect to said setpoint position, wherein the uncompensated error includes said error component due to said at least one frequency component of movement of said one of the second component and first component.
A method for controlling a relative position between a first component and a second component of a lithographic apparatus, the method comprising:
- determining a compensated error in the momentary position of one of the components with respect to a setpoint position, wherein the compensated error excludes from the actual error an error component due to at least one frequency component of movement of said one of the second component and first component;
- and
- determining an uncompensated error in the momentary position of said one of the components with respect to said setpoint position, wherein the uncompensated error includes said error component due to said at least one frequency component of movement of said one of the second component and first component.
Dependencies are inferred from the claim text.