| 摘要 |
<p>Microlithographic reduction projection catadioptric objective, which is devoid of planar folding mirrors and which comprises an aperture plane (stop) on the image side of the most imageward curved mirror (M34). After the most imageward curved mirror (M34) the beam is diverging. The most imageward curved mirror (M34) is convex. The objective consists in sequence from the object side (Ob) to the image side (Im) of a catadioptric group (L31-L35, M31, M32) giving a real intermediate image (Imi), a catoptric or catadioptric group (M33, M34) giving a virtual image, and a dioptric group (FLG') giving a real image.</p> |
