Lithographic apparatus and device manufacturing method
First Claim
1. A lithographic apparatus comprising:
- a projection system configured to project a patterned radiation beam onto a target portion of a substrate, said projection system including a movable optical element configured to change, by a displacement thereof, a position of the projected patterned radiation beam;
an optical element actuator configured to move the optical element; and
a projection system controller, operationally connected to the optical element actuator and configured to drive the optical element actuator so as to control the position of the projected radiation beam.
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Accused Products
Abstract
A lithographic apparatus includes a projection system including a movable optical element. The movable optical element is capable, by a displacement thereof to influence a position quantity of a radiation beam projected by the projection system. A control device is provided to drive the optical element actuator to influence a position quantity of the movable optical element, thereby influencing a position quantity of the radiation beam as projected by the projection system. The control device is adapted to move the movable optical element to position the radiation beam as projected by the projection system with respect to the substrate, or to correct a position quantity of the radiation beam as projected by the projection system caused by any type of disturbance on the projection system.
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Citations
27 Claims
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1. A lithographic apparatus comprising:
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a projection system configured to project a patterned radiation beam onto a target portion of a substrate, said projection system including a movable optical element configured to change, by a displacement thereof, a position of the projected patterned radiation beam;
an optical element actuator configured to move the optical element; and
a projection system controller, operationally connected to the optical element actuator and configured to drive the optical element actuator so as to control the position of the projected radiation beam. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A lithographic apparatus comprising:
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a projection system configured to project a patterned radiation beam onto a target portion of a substrate, the projection system comprising two optical elements at least partly determining an optical path of the projection system, a position of a first of the optical elements being controllable by a control loop, and a feed forward controller having a feed forward control input operationally coupled to a signal in the control loop of the first of the two optical elements, and a feed forward control output operationally connected to an actuator to affect a position of the second of the optical elements based on the signal of the control loop of the first of the optical elements. - View Dependent Claims (20, 21, 22, 23)
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24. A device manufacturing method comprising:
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projecting a patterned beam of radiation onto a target portion of a substrate via a projection system, and controlling a position of a movable optical element of the projection system so as to control a position of the projected patterned beam of radiation. - View Dependent Claims (25, 26)
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27. A device manufacturing method comprising:
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projecting a beam of radiation onto a target portion of a substrate via a projection system, the projection system comprising two optical elements at least partly determining an optical path of the projection system, controlling a position of a first of the optical elements with a control loop, and affecting a position of the second of the optical elements based on the signal of the control loop.
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Specification