Patent Number: 
Section: claims

1. An X-ray convergence element, in which X-rays entering from an entrance-side opening end of a tubular body are reflected on an inner surface of the tubular body, and the reflected X-rays exit from an exit-side opening end of the tubular body while being converged, the X-ray convergence element, comprising:an X-ray blocking member positioned adjacent the entrance-side opening end, having a diameter smaller than a diameter of the entrance-side opening end, a thickness of the X-ray blocking member, along a central axis of the tubular body, being different in a radial direction, and the center of the X-ray blocking member being arranged on the center axis of the tubular body,wherein a configuration of the varying side radial surface of the X-ray blocking member reflects incident X-rays to be equal to or greater than a total reflected optimal angle of the inner surface of the tubular body to enable reflected X-rays to pass through the tubular body. 2. The X-ray convergence element according to claim 1, further comprising:an annular member fixed in proximity to the entrance-side opening end; anda plurality of supporting members extending from the annular member toward the center of the X-ray blocking member to support the X-ray blocking member. 3. The X-ray convergence element according to claim 2, wherein the X-ray blocking member is an elongated plate-like body, a diameter of which being narrowed toward the X-ray entering side along the center axis. 4. The X-ray convergence element according to claim 2, wherein the X-ray blocking member has an X-ray incident surface that is a part of a spherical surface. 5. The X-ray convergence element according to claim 1, wherein the X-ray blocking member forms a spherical body;further comprising a plurality of fixing members for fixing the X-ray blocking member to the tubular body between the inner surface of the tubular body and a surface of the X-ray blocking member. 6. The X-ray convergence element according to claim 5, wherein the fixing members are spaced from each other with a predetermined distance in the circumferential direction of the tubular body, and are stick-like bodies arranged approximately parallel to each other in the axial direction of the tubular body. 7. The X-ray convergence element according to claim 1, further comprising an X-ray transmitting sheet for fixing the X-ray blocking member at the entrance-side opening end. 8. An X-ray irradiation device, comprising:the X-ray convergence element according to claim 1 for converging X-rays irradiated from an X-ray source; andan irradiating unit for irradiating the X-rays converged by the X-ray convergence element. 9. An X-ray convergence element in which X-rays entering from an entrance-side opening end of a tubular body are reflected on an inner surface of the tubular body, and the reflected X-rays exit from an exit-side opening end of the tubular body while being converged, the X-ray convergence element comprising:an X-ray blocking member having a diameter smaller than a diameter of the entrance-side opening end, a thickness of the X-ray blocking member, along a central axis of the tubular body, being different in a radial direction, and wherein the X-ray blocking member forms a spherical body further comprising a plurality of fixing members for fixing the X-ray blocking member to the tubular body between the inner surface of the tubular body and a surface of the X-ray blocking member, wherein the fixing members are spherical bodies arranged so as to be spaced from each other in the circumferential direction of the tubular body. 10. An X-ray convergence element, in which X-rays entering from an entrance-side opening end of an elongated glass tubular body are reflected on an inner surface of the elongated glass tubular body, and the reflected X-rays exit from an exit-side opening end of the elongated glass tubular body while being converted, the X-ray convergence element comprising:an X-ray blocking member, positioned adjacent the entrance-side opening end, having a diameter smaller than a diameter of the opening end, a thickness of the X-ray blocking member, along a central elongated glass axis of the tubular body, being different in a radial direction, and the center of the X-ray blocking member being arranged on the center axis of the elongated glass tubular body wherein a configuration of the varying side radial surface of the X-ray blocking member reflects incident X-rays to be equal to or greater than a total reflected optimal angle of the inner surface of the elongated glass tubular body to enable reflected X-rays to pass through the elongated glass tubular body. 11. An X-ray convergence element, in which X-rays entering from an entrance-side opening end of an elongated glass tubular body are reflected on an inner surface of the elongated glass tubular body, and the reflected X-rays exit from an exit-side opening end of the elongated glass tubular body while being converted, the X-ray convergence element comprising:an X-ray blocking member, positioned adjacent the entrance-side opening end, having a diameter smaller than a diameter of the opening end, a thickness of the X-ray blocking member, along a central axis of the elongated glass tubular body, being different in a radial direction, and the center of the X-ray blocking member being arranged on the center axis of the elongated glass tubular body wherein a configuration of the varying side radial surface of the X-ray blocking member reflects incident X-rays to be equal to or greater than a total reflected optimal angle of the inner surface of the elongated glass tubular body to enable reflected X-rays to pass through the elongated glass tubular body; andmeans for positioning the X-ray blocking member at the entrance-side opening of the elongated glass tubular body including an annular metal flange mounted on the entrance-side opening end to suspend the X-ray blocking member across the entrance-side opening end.