Projection optical system and exposure apparatus having the projection optical system
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United States of America Patent
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Oct 14, 2003
Grant Date -
Feb 13, 2003
app pub date -
Dec 10, 2001
filing date -
Dec 11, 2000
priority date (Note) -
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status (Latency Note)
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Abstract
A projection optical system according to the present invention whose image side numerical aperture is greater than or equal to 0.75, and which forms an image of a first object upon a second object using light of a predetermined wavelength less than or equal to 300 nm, comprises: a first lens group G1 of positive refractive power; a second lens group G2 of negative refractive power; a third lens group G3 of positive refractive power; and a fourth lens group G4 of positive refractive power, and: the first lens group G1, the second lens group G2, the third lens group G3 and the fourth lens group G4 are arranged in order from a side of the first object; and a distance D in mm along an optical axis between an optical surface of the fourth lens group G4 closest to the second object, and the second object, satisfies a condition of 0.1
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