Patent ID: 9261799
Filing Date: 2016-02-16
CPC Classification: G03F

Claim Text:
1. A movable support configured to hold an exchangeable object, the support comprising: a movable structure movably arranged with respect to a reference object; an object holder arranged over, and movable with respect to, the movable structure, the object holder including an upper surface to receive a lower surface of the exchangeable object and configured to hold and bear a weight of the exchangeable object from the lower surface of the exchangeable object, the object holder being supported by the movable structure; an actuator configured to move the movable structure with respect to the reference object; and an ultra short stroke actuator configured to move the object holder with respect to the movable structure, wherein a stiffness of the ultra short stroke actuator is substantially larger than a stiffness of the actuator, and wherein the ultra short stroke actuator is configured to move the object holder with respect to the movable structure to compensate for an error between a measured position of the movable structure and a desired position of the movable structure.