Patent ID: 8988752
Filing Date: 2015-03-24
Classification: G02B,G03F

Abstract:
1. A beam control apparatus for an illumination beam comprising at least one control component which influences a beam path of the illumination beam in the illumination beam path upstream of an aerial image of an object illuminated by the illumination beam, said component being displaceable in a controlled manner in at least one degree of freedom by at least one displacement actuator, the at least one control component being located in the illumination beam path upstream of the object, a position sensor device for detecting a position of the aerial image of the object, and a control device that is signal-connected to the position sensor device and the displacement actuator and calculates control signals for the displacement actuator from an aerial image position signal received from the position sensor device and forwards said control signals to the displacement actuator for controlling the position of the aerial image of the object, wherein the beam path of the illumination beam is directly influenced by the control component, wherein the control component is at least one of a component which is mechanically directly connected to a beam section or a component which is mechanically directly connected to at least one surface that guides the illumination beam path.