| 摘要 |
PURPOSE:To eliminate a partial shadow or the distortion of an image by converting an X-ray beam into a parallel beam wherein a crystal fixed by the wave length of X- rays and grid composition is arranged in an X-ray beam applied from a target. CONSTITUTION:A crystal 9 fixed by the wave length of a used X-ray and grid composition is arranged in the X-ray beam applied from a target 2. The X-ray beam is converted into a parallel beam by a specific diffraction surface 10 in the crystal. The X-ray beam converted into the parallel beam passes through a slit 12 and reaches a photosensitive plastic film 4 on a substrate 3 through a mask 5. In this case, the X-ray beam passed the crystal 9 has an oval section and almost becomes a rectangular section after passing the slit 12. In this way, a partial shadow and the distortion of an image will be eliminated and it is also absolutely unnecessary any electronic lens system required for narrowly diaphragming an electronic beam. |
