Lithographic apparatus and device manufacturing method
First Claim
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1. A lithographic apparatus comprising:
- a projection system configured to project a patterned beam onto a target portion of a substrate;
a frame configured to hold said projection system;
a mount configured to support said projection system on said frame, said mount comprising a piezo-electric actuator configured to apply a force to move said projection system; and
a sensor configured to measure a position or a time derivative of the position of said frame,wherein said piezo-electric actuator is controlled based on the measured position or the time derivative of said position of said frame.
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Abstract
Data from the piezo-electric sensors in the mounts for the projection system can be used in the control loops for other parts of the lithographic apparatus, for example the mask table, the substrate table or the air mounts for the frame bearing the projection system. Information from, for example, a geophone, which is used to measure the absolute velocity of the frame bearing the projection system, can be used in the control loop for the piezo-electric actuator in the mount for the projection system.
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Citations
9 Claims
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1. A lithographic apparatus comprising:
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a projection system configured to project a patterned beam onto a target portion of a substrate; a frame configured to hold said projection system; a mount configured to support said projection system on said frame, said mount comprising a piezo-electric actuator configured to apply a force to move said projection system; and a sensor configured to measure a position or a time derivative of the position of said frame, wherein said piezo-electric actuator is controlled based on the measured position or the time derivative of said position of said frame. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A device manufacturing method comprising:
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projecting a patterned beam of radiation onto a target portion of a substrate using a projection system; holding said projection system using a frame; supporting said projection system on said frame using a mount, said mount comprising a piezo-electric actuator constructed to apply a force to move said projection system; measuring a position or a time derivative of the position of said frame; and controlling said piezo-electric actuator based on the measured position or the measured time derivative of the position of said frame.
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Specification