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USRE42118E1 Projection system for EUV lithography 有权
EUV光刻投影系统

Projection system for EUV lithography
摘要：
An EUV optical projection system includes at least six reflecting surfaces for imaging an object (OB) on an image (IM). The system is preferably configured to form an intermediate image (IMI) along an optical path from the object (OB) to the image (IM) between a secondary mirror (M2) and a tertiary mirror (M3), such that a primary mirror (M1) and the secondary mirror (M2) form a first optical group (G1) and the tertiary mirror (M3), a fourth mirror (M4), a fifth mirror (M5) and a sixth mirror (M6) form a second optical group (G2). The system also preferably includes an aperture stop (APE) located along the optical path from the object (OB) to the image (IM) between the primary mirror (M1) and the secondary mirror (M2). The secondary mirror (M2) is preferably concave, and the tertiary mirror (M3) is preferably convex. Each of the six reflecting surfaces preferably receives a chief ray (CR) from a central field point at an incidence angle of less than substantially 15°. The system preferably has a numerical aperture greater than 0.18 at the image (IM). The system is preferably configured such that a chief ray (CR) converges toward the optical axis (OA) while propagating between the secondary mirror (M2) and the tertiary mirror (M3).
摘要（中）：

EUV光学投影系统包括用于对图像（IM）上的物体（OB）进行成像的至少六个反射表面。 该系统优选地被配置成沿着从物体（OB）到次级反射镜（M2）和第三反射镜（M3）之间的图像（IM）的光路形成中间图像（IMI），使得主反射镜 M1）和副镜（M2）形成第一光学组（G1），第三反射镜（M3），第四反射镜（M4），第五反射镜（M5）和第六反射镜（M6）形成第二光学组 （G2）。 该系统还优选地包括沿着从物体（OB）到主镜（M1）和副镜（M2）之间的图像（IM）的光路定位的孔径光阑（APE）。 副镜（M2）优选为凹面，第三反射镜（M3）优选为凸面。 六个反射表面中的每一个优选地以小于大约15°的入射角从中心场点接收主光线（CR）。 该系统优选地在图像（IM）处具有大于0.18的数值孔径。 优选地，该系统被配置为使得主光线（CR）在副反射镜（M2）和第三反射镜（M3）之间传播的同时朝向光轴（OA）会聚。

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