Fish & Richardson P.C.
Imaging system for a microlithographical projection light system
Imaging system of a microlithographic projection exposure apparatus, with a projection objective (200, 300, 500, 600) that serves to project an image of a mask which can be set into position in an object plane onto a light-sensitive coating layer which can be set into position in an image plane, and with a liquid-delivery device (205) serving to fill immersion liquid (202, 310, 507) into an interstitial space between the image plane and a last optical element (201, 309, 506) on the image-plane side of the projection objective; wherein the last optical element on the image-plane side of the projection objective is arranged so that, seen in the direction of gravity, it follows the image plane; and wherein the projection objective is configured in such a way that when the system is operating with immersion, the immersion liquid has at least in some areas a convex-curved surface facing in the direction away from the image plane. It is also proposed for the last optical element (201, 309, 506) on the image-plane side of the projection objective to be arranged below the image plane in such a way that the immersion liquid (202, 310, 507, 601) is held at least in part in a substantially tub-shaped area on the last optical element on the image-plane side. Also, a rotator can be provided which serves to rotate a substrate carrying the light-sensitive coating (401) between a transport orientation in which the light-sensitive coating lies on a substrate surface that faces against the direction of gravity and an exposure orientation in which the light-sensitive coating (401) lies on a substrate surface that faces in the direction of gravity.
Carl Zeiss SMT AG
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Alexander Andreas Norbert Susanne Toralf Bernhard
Epple Dorsel Wabra Beder Gruner Kneer