摘要:
A lithographic apparatus comprises a substrate table to hold a substrate and a projection system to project a patterned radiation beam onto a target portion of the substrate. The lithographic apparatus further comprises a fluid supply system to supply a fluid between the substrate and a final lens element of the projection system as well as a position controller to control a position of the fluid supply system. The position controller is configured to, being provided with a position quantity of the substrate, determine a desired position of the liquid supply system by adding a position offset to the position quantity of the substrate, and position the liquid supply system according to the desired position. The position quantity may comprise a position and/or rotational position of the substrate table and/or a height function of a substrate height.
摘要:
A lithographic apparatus for immersion lithography is described in which a compensation controller controls actuators to apply forces to the substrate equal in magnitude and opposite in direction to forces which are applied to the substrate by a liquid supply system which supplies liquid between the projection system and the substrate.
摘要:
A lithographic apparatus includes a first movable element (such as an immersion liquid supply system), which is in operation in contact with a surface of a second movable element (such as a substrate table). Further, the lithographic apparatus includes a second element controller (such as a substrate table controller) to control a position quantity of the second movable element. Disturbance forces caused by, e.g., movements of the first and second movable elements with respect to each other, due to capillary forces disturb a position of the first and second movable elements. To at least partly correct a position of the second movable element due to such disturbance forces, the lithographic apparatus includes a feedforward control path to provide a disturbance force feedforward signal to the second element controller, the feedforward control path including a disturbance force estimator to estimate a disturbance force from a position quantity of the first movable element.
摘要:
A lithographic projection apparatus in which a balance mass is supported by a base frame using at least one supporting member which is coupled to both the base frame and balance mass. Free horizontal movement is provided by providing the supporting member with at least two pivot points.
摘要:
A projection system includes at least one projection device configured to receive a beam of radiation coming from a first object and project the beam to a second object. The projection system further includes a sensor configured to measure a spatial orientation of the at least one projection device and a processing unit configured to communicate with the at least one sensor. The processing unit is configured to communicate with a positioning device configured to adjust the position of at least one of the first object and the second object based on the measured spatial orientation of the at least one projection device.
摘要:
A lithographic apparatus capable of reducing sensitivity to fluctuating scanning speed and improve lithographic scanning processing time, is presented herein. In one embodiment, the apparatus comprises a modulator that modulates a patterned lithographic beam based on the scanning speed as the beam and substrate move relative to each other. The modulator is configured to modulate an attribute of a patterned lithographic beam, such as, the intensity or size of the beam.
摘要:
In a lithographic apparatus, a localized area of the substrate surface under a projection system is immersed in liquid. The height of a liquid supply system above the surface of the substrate can be varied using actuators. A control system uses feedforward or feedback control with input of the surface height of the substrate to maintain the liquid supply system at a predetermined height above the surface of the substrate.
摘要:
A measurement system is configured to derive a position quantity of an object, the measurement system includes at least one position quantity sensor configured to provide respective position quantity measurement signals; a position quantity calculator configured to determine a position quantity of the object from the position quantity measurement signal, wherein the position quantity calculator includes a torsion estimator configured to estimate a torsion of the object, the position quantity calculator being configured to correct the determined position quantity of the object for the estimated torsion.
摘要:
A method for positioning an object by an electromagnetic motor which, in use, produces a plurality of primary forces and a pitch torque associated with the primary forces. The method includes a cycle which includes: determining the desired forces and torques for positioning the object, determining the primary forces to be generated by the motor, determine the pitch torque from either the primary forces or from the desired forces and torques, determine the desired signals for the motor to generate the primary forces. In a next cycle, prior to the determination of the primary forces, the desired forces and torques for positioning the object are modified using the pitch torque determined in the previous cycle of steps.
摘要:
In a lithographic apparatus, a localized area of the substrate surface under a projection system is immersed in liquid. The height of a liquid supply system above the surface of the substrate can be varied using actuators. A control system uses feedforward or feedback control with input of the surface height of the substrate to maintain the liquid supply system at a predetermined height above the surface of the substrate.