| 摘要 |
<p>PROBLEM TO BE SOLVED: To enhance goniometric accuracy as a standard by smoothly rotating tube bulb arms and counter arms by axially fitting shaft rings revolving centering around a fixed shaft to the outer peripheral surface of the fixed shaft in a superposed state and providing tube bulb arms and counter arms so as to extend them outwardly form the shaft rings to rotate the shaft rings and eliminating the mutual interference of the shaft rings at a time of rotation. SOLUTION: A tube bulb rotating means is equipped with tube bulb driving shaft rings fitted to the outer periphery of the upper part of a fixed shaft 31 and rotationally driven by worm gears 37 and the tube bulb arms 36 directly joined to the shaft rings and having X-ray tubes fitted thereto. A detector rotating means is equipped with the detector driving shaft rings 39 fitted to the outer periphery of the lower part of the fixed shaft 31 in a superposed state in the vicinity of the under surfaces of the tube bulb driving shaft rings and rotationally driven by the worm gears 37 and the counter arms 40 directly joined to the shaft rings 39 and having detectors fitted thereto.</p> |
