Abstract:
The present disclosure relates to a metrology apparatus for measuring a parameter of interest of a targets on a substrate comprising: m x n detectors, wherein m≥1 and n≥1; a first frame; and (n-1) second frames; and (m-1) x n intermediate frames, wherein: each detector is connected to one of the intermediate or first or second frames via a primary positioning assembly; and each intermediate frame is connected to one of the first or second frames via a secondary positioning assembly.
Abstract:
The invention relates to an actuator assembly comprising a first piezo actuator and a second piezo actuator. According to a first aspect the piezo actuator comprises a correction unit, configured to determine an output voltage difference representing a difference between a voltage at the output terminal of the first piezo actuator and a voltage at the output terminal of the second piezo actuator, and a first power correction for correcting the first power signal and/or a second power correction for correcting the second power signal, based on the output voltage difference. According to a second aspect a power unit, said power unit configured to generate a power signal for the first and second piezo actuator based on the set point, and to provide the power signal to the first terminal of the first piezo actuator and to the second terminal of the second piezo actuator.
Abstract:
The invention provides a lithographic apparatus or frame assembly, comprising: - a first and a second pneumatic support, being arranged to control a position of a frame, each of said pneumatic supports accommodating a pressure chamber, - a frame position control system, comprising: - a first position sensor device, configured to generate measurement data relating to the position of the frame, - a first pressure controller, configured to control the pressure in the pressure chamber of the first pneumatic support on the basis of the measurement data generated by the first position sensor device, - a pressure differential sensor device, configured to generate data relating to the difference between the pressure in the pressure chambers of the first pneumatic support and the second pneumatic support, - a second pressure controller, configured to control the pressure in the pressure chamber of the second pneumatic support on the basis of the measurement data from the pressure differential sensor device.
Abstract:
The invention provides a pneumatic support device for a lithographic apparatus and a lithographic apparatus with such support device. The support device comprises a gas spring. The gas spring comprises a suspending part, a suspended part, and a pressure chamber configured for supporting the suspended part relative to the suspending part. The support device further comprises an actuator configured for positioning the suspended part relative to the suspending part, an acceleration sensor configured for generating a first sensor signal representative for the acceleration of the suspending part, a pressure sensor configured for generating a second sensor signal representative for the pressure in the pressure chamber, and a control unit. The control unit is configured to: receive the first sensor signal, receive the second sensor signal, filter the first sensor signal in a low-pass filter, filter the second sensor signal in a high-pass filter, determine, based on the filtered first sensor signal and filtered second sensor signal, a force exerted by the suspending part on the suspended part, and generate, based on said force, a control signal for the actuator.
Abstract:
The present invention relates to a positioning system, comprising: a first actuator to exert an actuation force on a moveable body, the first actuator being coupled to a balance mass configured to absorb a reaction force resulting from the actuation force, the actuation force providing an acceleration of the moveable body and the reaction force providing an acceleration of the balance mass, wherein a force resulting from the acceleration of the moveable body together with a force resulting from the acceleration of the balance mass result in a balance mass torque; a balance mass support to support the balance mass onto a frame, which balance mass support engages the frame at a support position; and a torque compensator; wherein the torque compensator exerts a compensation force to compensate the balance mass torque, and wherein the torque compensator exerts the compensation force on the frame at the support position.
Abstract:
A lithographic apparatus comprising an illumination system for providing a beam of radiation, a support structure for supporting a patterning device, the patterning device serving to impart the radiation beam with a pattern in its cross-section, a substrate table for holding a substrate, a projection system for projecting the patterned radiation beam onto a target portion of the substrate, and a wavelength modulator configured to vary a wavelength of the radiation beam across the cross-section of the radiation beam.
Abstract:
An actuator system (AS) is configured to position an object (OJ), the actuator system comprises a piezo actuator (PA) comprising an actuator contact surface (ACS). The piezo actuator is configured to exert a force (F) via the actuator contact surface onto the object. The actuator system further comprises an optical position sensor (OPS) configured to measure a position of the actuator contact surface. The piezo actuator comprises a transparent piezo material. The optical position sensor is configured to transmit an optical beam (OB) through the transparent piezo material to the actuator contact surface. The transparent piezo material may be LJNB03. The optical position sensor may form an interferometer.
Abstract:
A lithographic apparatus (300) includes: a base frame (50); an illumination system (310) configured to condition a radiation beam and supported by the base frame; a support (320) constructed to support a patterning device (350), the patterning device being capable of imparting the radiation beam with a pattern in its cross- section to form a patterned radiation beam; a substrate table (100.2, 100.3) constructed to hold a substrate (110); a projection system (340) configured to project the patterned radiation beam onto a target portion of the substrate; a positioning device (100) configured to position the substrate table, the positioning device being supported by the base frame; a sensor (395) configured to sense a vibration caused by a torque exerted on the base frame and, an actuator configured to exert a force on the illumination system or the base frame, in response to the sensed vibration, in order to at least partly dampen the vibration.
Abstract:
The invention provides a method of determining a motor-dependent commutation model for an electromagnetic motor, whereby the electromagnetic motor comprises a first member comprising a coil array comprising at least M coils, and a second member comprising a magnet array configured to generate a spatially alternating magnetic field, whereby the first member and the second member are configured to displace relative to each other in N degrees of freedom, N
Abstract:
Described herein is a metrology tool. The metrology tool includes a substrate table (ST) to hold a substrate (S); a projection system (PS) configured to project a beam on a target portion (TP) of the substrate; an actuator (PEA) configured to adjust a position of the projection system relative to the substrate on the substrate table; a sensor configured to determine a position of the substrate table; and a one or more processors configured to: determine, based on the position of the substrate table, a position error of the substrate table with respect to a reference; and control, via the actuator, a position of the projection system to compensate for the position error of the substrate table so that the beam projects on the target portion of the substrate.