Patent Number: 
Section: claims

1. An X-ray diffractometer for obtaining X-ray diffraction angles of diffracted X-rays, comprising:an x-ray source configured to emit x-rays at a sample;an X-ray detector configured to detect diffracted X-rays diffracted at the sample angles about a center point of goniometer circles when x-rays are emitted at the sample; andan X-ray shield member provided with an X-ray passage port that is maintained on a center point of said goniometer circles,whereinthe X-rays diffracted at the sample so as to pass through the center point of the goniometer circles pass through the X-ray passage port, andthe X-rays diffracted at the sample so as to pass through areas other than the center point of the goniometer circles are shielded by the X-ray shield member. 2. The X-ray diffractometer according to claim 1, wherein the X-ray shield member is disposed in contact with the surface of the sample or near the surface of the sample. 3. The X-ray diffractometer according to claim 1, wherein the X-ray shield member is disposed in contact with the end face of the sample on the X-ray detector side, or near the end face of the sample on the X-ray detector side. 4. The X-ray diffractometer according to claim 1, wherein the X-ray passage port is a pinhole extending in the direction intersecting the sample, or a slit extending in the direction intersecting the sample. 5. The X-ray diffractometer according to claim 1, wherein the X-rays incident on the sample are line-focus X-rays, and the lengthwise direction of the line focus is the direction parallel to the surface of the sample. 6. The X-ray diffractometer according to claim 1, wherein X-rays are caused to be incident at a low angle with respect to the sample so that diffraction occurs on a lattice plane perpendicular to the surface of the sample. 7. The X-ray diffractometer according to claim 6, further comprising:an ω-rotation system for adjusting the incidence angle of X-rays on the sample;a φ-rotation system for rotating the sample in-plane;a 2θ-rotation system for moving the X-ray detector in the out-of-plane direction; anda 2θχ-rotation system for moving the X-ray detector in the in-plane direction;wherein the ω-rotation system, the φ-rotation system, the 2θ-rotation system, and the 2θχ-rotation system operate about the center point, as an origin, of the goniometer circles, which is a shared center point.