摘要:
A method of actuating a movable object in a first degree of freedom includes a) providing a first motor assembly including one or more motors of a first type and a second motor assembly including one or more motors of a second type, each of the first and second motor assembles being configured to move the movable object in the first degree of freedom, b) feeding the first motor assembly with a feed-forward signal of a feed-forward unit on the basis of a feed-forward reference signal, and c) feeding the second motor assembly with a control signal of a position control unit on the basis of a position control reference signal.
摘要:
A lithographic apparatus includes an illumination system that conditions a radiation beam, a patterning support holding a patterning device that patterns the radiation beam, a substrate support to hold a substrate, a projection system to project the patterned radiation beam onto the substrate, an additional support, and a flexible line assembly to transfer at least one of a current, a signal or a fluid. A first part of the line assembly extends between a base and the additional support, and a second part extends between the additional support and the patterning support or the substrate support. A first motor assembly generates a force in at least one direction, and is coupled to the one of either the patterning support or the substrate support. A second motor assembly generates a force in the at least one direction, and is coupled to the additional support. The first motor assembly includes a planar motor.
摘要:
A control system for controlling a position of a mass, such as, for example, a substrate holder in a lithographic apparatus, is presented herein. The control system comprises a first input to receive a desired position of the mass, a second input signal to receive a feedback signal indicative of the actual position of the mass, a control unit that produces a signal indicative of the required control force based on the difference between the desired mass position and the actual mass position, and an estimator unit that calculates an estimated relation between the control force and mass status information indicative of at least one of a position of said mass, a velocity of said mass, and an acceleration of said mass, and a third input to receive a feed-forward signal indicative of the desired mass acceleration. The control system then determines the control force needed to accelerate the mass and move it to a desired position based on the estimated relation and the desired mass acceleration.
摘要:
A lithographic projection apparatus is presented, which includes a housing, which comprises therein a first exposure system that has at least one movable part (e.g. a movable first substrate holder or a movable second substrate holder in a twin stage apparatus). The apparatus also includes a position disturbance correction system for correcting a position of the first substrate holder with respect to the patterned projection beam due to the influence of gas pressure differences or gas movements, caused by movements of the movable part. A related device manufacturing method is also presented in which, during the exposure of a first substrate, the position thereof is corrected by means of position disturbance correction system.
摘要:
A positioning device for positioning an object that includes a first actuator and a connector arranged between the first actuator and the object. The connector includes a resilient member and a second actuator connected in series with the resilient member. The first actuator being constructed and arranged to exert a force in a first direction on the connector and the second actuator is controlled to maintain a distance between the first actuator and the object in the first direction substantially constant.
摘要:
The present invention relates to a lithographic projection apparatus comprising a housing, which comprises therein a first exposure system that has at least one movable part, e.g. a movable first substrate holder, or a movable second substrate holder in a twin stage apparatus. The system is further provided with position disturbance correction system for correcting a position of the first substrate holder with respect to the patterned projection beam due to the influence of gas pressure differences or gas movements, caused by movements of the movable part. The invention also generally relates to a device manufacturing method comprising providing a lithographic projection apparatus according to the invention with a first substrate, and exposing said first substrate, wherein during said exposing of the first substrate a position thereof is corrected by means of position disturbance correction system.
摘要:
In a lithographic apparatus the shape of the focal plane is adjusted using available manipulators in the projection lens system so that it is in closer conformity to the shape of the wafer surface in the exposure area. The control of the focal plane shape can be integrated with the leveling control which determines the height and tilt of the wafer surface.
摘要:
In a lithographic apparatus, a scanning mechanism is coarse compared with precise patterns to be exposed onto a substrate. In order to ensure that the image and the substrate are aligned at some point in time, an oscillation is imparted to either the substrate table, or to a device that aligns the image, such as a mask table. The oscillation frequency is chosen to compliment a maximum alignment error. The frequency of a radiation pulse is arranged to coincide with the image and the substrate being most accurately aligned. The radiation pulse of the image may be timed to coincide with the alignment without the use of the imparted oscillation.
摘要:
A method for damping an object in two or more degrees of freedom, including measuring a position quantity at each of the two or more measurement locations; extracting from the measured position quantities a measurement signal for each dynamic mode; feeding the measurement signal of a dynamic mode to a controller unit associated with the respective dynamic mode, the controller unit providing for each dynamic mode an output signal on the basis of the respective measurement signal; and providing a control signal to each of the two or more actuators, the control signal for each actuator being based on output signals of one or more controller units.