Abstract aFb==73aLw
Refractive projection objective with a numerical aperture greater than 0.7, consisting of a first convexity, a second convexity, and a waist arranged between the two convexities. The first convexity has a maximum diameter denoted by D1, and the second convexity has a maximum diameter denoted by D2, and 0.8<D.sub.1/D.sub.2<1.1. vkx7paY_
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Inventors: Rostalski, Hans-Juergen; (Berlin, DE) ; Schuster, Karl-Heinz; (Koenigsbronn, DE) ; Hudyma, Russell; (San Ramon, CA) ; Ulrich, Wilhelm; (Aalen, DE) ; Freimann, Rolf; (Aalen, DE) Vl /+;6_
Correspondence Name and Address: SUGHRUE MION, PLLC p; 59?
2100 PENNSYLVANIA AVENUE, N.W. oim9< _
SUITE 800 +\c5] `
WASHINGTON mAj?>;R2$2
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Assignee Name and Adress: CARL ZEISS SMT AG o WrKM
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Serial No.: 931051 h-#6av :
Series Code: 10 t7dt*D_YqK
Filed: September 1, 2004 Ustv{:7v
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U.S. Current Class: 359/649 iwZPpl ";
U.S. Class at Publication: 359/649 <EB+1GFuI
Intern'l Class: G02B 003/00; G02B 009/00 85 |OGtt
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Foreign Application Data MSQEO4ge
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Date Code Application Number @; zl
Sep 12, 2003 WO 03/075049 A2 /yDz/>ID\
Feb 6, 2003 WO PCT/EP03/01147 !N\ @'F!
Sep 12, 2003 WO 03/075096 A2 7 S#J>*
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Claims
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1. A refractive projection objective for microlithography with a numerical aperture NA greater than 0.7, consisting of: a first lens group immediately following an object plane of the projection objective and having negative refractive power; a second lens group immediately following the first lens group and having positive refractive power; a third lens group immediately following the second lens group and having negative refractive power for generating a constriction of a light beam passing through the projection objective; a fourth lens group immediately following the third lens group and having positive refractive power; and a fifth lens group immediately following the fourth lens group and having positive refractive power; the projection objective thereby consisting of a first convexity, a second convexity, and a waist arranged between the first and second convexity, wherein the first convexity has a maximum diameter denoted by D1, and the second convexity has a maximum diameter denoted by D2, and 0.8<D.sub.1/D.sub.2<1.1. c@!_ /0
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2. A refractive projection objective according to claim 1, wherein the following relationship of the maximum diameters holds: 0.9<D.sub.1/D.sub.2<1.0. {3>$[bT
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3. A refractive projection objective which, in the direction of propagation of the light, consists of a first lens group with negative refractive power, of a second lens group with positive refractive power, and of a third lens group with negative refractive power, for the provision of a constriction of the light beam, and of a following fourth lens group with positive refractive power, and of a system diaphragm with a following fifth lens group, which has positive refractive power, wherein before the diaphragm and after the diaphragm a respective meniscus lens curved toward the object is arranged. 。。。。。。
