Patent Number: 051270293
Section: abstract

An X-ray exposure apparatus includes an X-ray source; and a directing optical system for directing an X-ray beam from the X-ray source to a surface to be exposed, the directing optical system incuding a mirror having a reflection surface of a curvature radius R with respect to a predetermined sectional plane, for reflecting the X-ray beam and for expanding the diameter thereof with respect to the sectional plane; wherein the mirror satisfies the following conditions: EQU R=(2d.sub.1 d.sub.2 .sigma.')/{[.DELTA.-(d.sub.1 +d.sub.2).sigma.'].multidot..alpha.}. where. d.sub.1 : the distance from the emission point of the X-ray source to the center of effective X-ray beam diameter on the reflection surface; PA0 d.sub.2 : the distance from the center of effective X-ray beam diameter on the reflection surface to the center of effective X-ray beam diameter on the surface to be exposed; PA0 .alpha.: the angle defined at the center of effective X-ray beam diameter on the reflection surface, between the X-ray beam and the reflection surface; PA0 .sigma.': a standard deviation of a distribution of intensities of the rays having different emission angles at the sectional plane, at the gravity center wavelength of the X-ray beam from the X-ray source; PA0 .DELTA.: 0.43a.ltoreq..DELTA..ltoreq.4.0a; and PA0 a: the length of the surface to be exposed, with respect to the sectional plane.