Lithographic apparatus and device manufacturing method
First Claim
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1. A lithographic apparatus, comprising:
- a substrate holder configured to hold a substrate;
a radiation system configured to condition a beam of radiation;
a support structure configured to support a patterning device that imparts a desired pattern onto the beam of radiation;
a projection system that projects the patterned beam onto a target portion of the substrate;
a base frame;
at least one actuator that moves the substrate holder relative to the base frame; and
a balance mass arranged such that the substrate holder exerts a reaction force on the balance mass, wherein the balance mass is resiliently connected to the base frame with a suspension frequency that is different than resonant frequency of the base frame.
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Abstract
A lithographic apparatus is presented in which vibrations induced by reaction forces exerted on a base frame BF by accelerations within the apparatus are eliminated without the need for complex positioning systems and several balance masses. This is achieved by using feed-forward control to apply a compensating force using actuators to the base frame, based on knowledge of the movements and accelerations of the substrate table and other parts within the apparatus.
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Citations
11 Claims
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1. A lithographic apparatus, comprising:
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a substrate holder configured to hold a substrate;
a radiation system configured to condition a beam of radiation;
a support structure configured to support a patterning device that imparts a desired pattern onto the beam of radiation;
a projection system that projects the patterned beam onto a target portion of the substrate;
a base frame;
at least one actuator that moves the substrate holder relative to the base frame; and
a balance mass arranged such that the substrate holder exerts a reaction force on the balance mass, wherein the balance mass is resiliently connected to the base frame with a suspension frequency that is different than resonant frequency of the base frame. - View Dependent Claims (2, 3)
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4. A lithographic apparatus, comprising:
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a substrate holder configured to hold a substrate;
a radiation system configured to condition a beam of radiation;
a support structure configured to support a patterning device that imparts a desired pattern onto the beam of radiation;
a projection system that projects the patterned beam onto a target portion of the substrate;
a base frame;
at least one actuator configured to apply a force to the base frame; and
a controller configured to control the at least one actuator, wherein when one or more moving components within the apparatus applies a reaction force to the base frame, the controller controls the actuator to apply a force, which is opposite in magnitude and direction to the reaction force, to the base frame. - View Dependent Claims (5, 6, 7, 8, 9, 10)
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11. A device manufacturing method, comprising:
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providing a substrate that is at least partially covered by a layer of radiation-sensitive material, the substrate being carried by a substrate holder that is movable relative to a base frame;
projecting a patterned beam of radiation onto a target portion of the substrate applying a reaction force to the base frame to generate movement of the substrate holder; and
applying a force to the base frame that is opposite in direction and magnitude to the reaction force.
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Specification