摘要:
Embodiments of the present invention are directed to an apparatus and a method for through lens measurement for a projection system. In one embodiment, an apparatus for through lens image measurement comprises a projection lens housing containing lens elements therein, and a reflective member having a center of curvature on a first plane. The reflective member is attached to the lens housing. An optical system includes a light source, a position detector, and one or more optical elements. The optical system is attached to the lens housing and configured to direct a light from the light source through the lens elements to the reflective member which reflects the light back through the lens elements and toward the position detector. The position detector is configured to detect any image shift at the first plane due to misalignment of the lens elements with respect to the lens housing.
摘要:
Embodiments of the present invention are directed to an apparatus for providing a low spring constant, pneumatic suspension using vacuum for the lens in a projection system. In one embodiment, a pneumatic suspension system for a load comprises a frame; and a body movably disposed in the frame and spaced from a side wall of the frame by a gap to define a chamber in the frame above the body, the body being configured to be connected to the load. The frame includes an outlet to draw a gas from the chamber to lower the pressure in the chamber with respect to an ambient pressure outside the frame. An air bearing is formed in the gap between the body and the side wall of the frame to provide non-contact between the body and the frame. The pressure in the chamber is sufficiently lower than the ambient pressure to produce a lift force to lift the body and the load connected thereto with respect to the frame.
摘要:
Methods and apparatus for providing a stage with a relatively high positioning bandwidth and low transmissibility are disclosed. According to one aspect of the present invention, a method for positioning a stage including providing a first force of a first magnitude to the stage using a primary actuator and providing a second force of a second magnitude to the stage using a secondary actuator. The first force is arranged to cause the stage to translate along a first axis. The secondary actuator is also arranged to cause the stage to translate along the first axis, and has a relatively high positioning bandwidth. The first force is arranged to enable the stage to be relatively coarsely positioned and the second force is arranged to enable the stage to be relatively finely positioned. In one embodiment, the secondary actuator is one of a voice coil motor and a piezoelectric motor.
摘要:
A projection optical device includes a projection optical system which projects an image of a pattern, a support device having a flexible structure to support the projection optical system, and a positioning device having an actuator to position the projection optical system. The projection optical device can include a frame to which one end of the flexible structure is attached. The projection optical system may hang from the frame via the support device, or it may be supported from below by the support device. A projection optical device also can include a liquid supply which supplies a temperature-controlled liquid to a side surface of a projection optical system utilizing gravity to cause the temperature-controlled liquid to flow along the side surface of the projection optical system.
摘要:
Methods and apparatus for supporting the weight of a first stage of a stage apparatus using magnets are disclosed. According to one aspect of the present invention, and apparatus includes a first structure, a second structure, and an anti-gravity device. The anti-gravity device has a first magnet and a piston arrangement that includes a second magnet. The first magnet is coupled to the first structure, and the piston arrangement is movably interfaced with the second structure through an air bearing. The first magnet and the piston arrangement cooperate to support the first structure over the second structure relative to a vertical axis.
摘要:
An adjuster assembly (12) that adjusts the location where an image (18) from an object (20) is transferred onto a device (16) includes an adjuster (54) and a stage mover assembly (244). The stage mover assembly (244) adjusts the position of the adjuster (54). This moves the position where the image (18) is transferred onto the device (16). The adjuster assembly (12) can include a damper assembly (250) that is coupled to the stage mover assembly (244) and reduces the effect of vibration from the stage mover assembly (244) causing vibration on the rest of the apparatus.
摘要:
An active vibration isolation system includes a pneumatic control system and an electronic control system. The pneumatic control system supports a mass sensitive to vibration and isolates the mass from high frequency external disturbances. The electronic control system isolates the mass from low frequency external disturbances. The pneumatic control system includes a compliance chamber filled with a fluid to pneumatically support the mass, apparatus for directly measuring a pressure level in the compliance chamber, and apparatus for controlling the pressure level to minimize the effects of pressure variation in the compliance chamber. The measuring apparatus includes an instrument to measure an absolute pressure level of the compliance chamber or an instrument to measure a differential pressure level between the compliance chamber and a reference chamber having a predetermined pressure level.
摘要:
Methods, apparatus, and systems are disclosed for identifying force-ripple and/or side-forces in actuators used for moving a multiple-axis stage. The identified force-ripple and/or side-forces can be mapped, and maps of corresponding position-dependent compensation ratios useful for correcting same are obtained. The methods are especially useful for stages providing motion in at least one degree of freedom using multiple (redundant) actuators. In an exemplary method a stage member is displaced, using at least one selected actuator, multiple times over a set distance in the range of motion of the subject actuator(s). Each displacement has a predetermined trajectory and respective starting point in the range. For each displacement, respective section force-command(s) are extracted and normalized to a reference section force-command to define a section compensation-ratio. Multiple section compensation-ratios are assembled, as functions of displacement in the range, to provide a map of compensation ratios for the actuator(s) throughout the range.
摘要:
A stage assembly (220) includes a stage base (202) having a guide surface (203), a first stage (206), a second stage (208), and a first mover subassembly (216) including a first mover (231) and a second mover (232) that are arranged in series. The stage base (202) supports the first stage (206), which moves relative to the stage base (202). The movers (231, 232) cooperate to move the second stage (208) relative to the first stage (206). The movers (231, 232) can include one or more attraction-only type actuators. The movers (231, 232) cooperate to move the second stage (208) along an axis that is substantially perpendicular to the guide surface (203). The stage assembly (220) can also include a second mover subassembly (216) that cooperates with the first mover subassembly (216) to move the second stage (208) with two or more degrees of freedom relative to the first stage (206). Further, the first mover (231) can directly move a portion of the second mover (232).
摘要:
A stage assembly and support system are provided to stabilize a stage base, such as a wafer stage base or a reticle stage base, minimizing forces transmitted from the stage assembly to a stationary surface, such as the ground, and thereby preventing vibration of other parts or systems in a wafer manufacturing process. Depending of the applicable photolithography system, a reticle stage and/or a wafer stage are accelerated in response to a wafer manufacturing control system to position the semiconductor substrates. The jerking motions of the reticle stage and/or wafer stage cause reaction forces acting on the reticle stage base and/or wafer stage base. The reaction forces induce vibration to the stationary surface and surrounding parts of the photolithography system. The wafer stage assembly and support system according to this invention allow the reticle stage base and/or wafer stage base to move relative the stationary surface. The base, acting as a massive reaction mass, stores a kinetic energy from the reaction force and gradually dissipates such energy by applying small forces to the reaction mass. The stage assembly and support system according to this invention are also capable of canceling any disturbance forces acting on the base.