Patent ID: 7535013

Claim:
Extreme UV radiation exposure tool which comprises: an extreme UV radiation source device having: means for producing a plasma, which surrounds a high density and high temperature region essentially in a middle area thereof which emits extreme UV radiation, by heating and excitation of a supplied raw material; an optical focusing means for focusing radiation with a spatial distribution of wavelength which has been emitted from the said plasma, said radiation being formed of extreme UV radiation emitted from the high density and high temperature region of the plasma and of radiation emitted from an area outside the high density and high temperature region of said plasma; and a radiation exit part for extracting the focused radiation, and a mask in which a pattern is formed; an illumination optical system which comprises at least one optical element and which projects radiation which contains the radiation extracted from the radiation exit part of the above described extreme UV radiation source device onto the mask; a projection optical system which projects the radiation from the mask onto a workpiece, and a radiation shielding means provided with an opening for transmitting only a portion of the radiation extracted by the radiation exit part, the radiation shielding means being positioned so that the opening is able to effectively eliminate radiation outside of a band which has adverse effects on exposure without reducing the intensity of extreme UV radiation with a wavelength of 13.5 nm with the middle of the opening being located on the optical axis of the optical focusing means in an area of an optical path between the optical focusing means of the above-described extreme UV radiation source device and an optical element of the illumination optical system in which the radiation from the radiation exit part of the extreme UV radiation source device is first incident.