| 摘要 |
PURPOSE:To operate stably a high speed stereo X-ray photographing apparatus with a high speed by closing a high voltage switch mechanism for a shorter period than the time when each cathode is kept to electric potential where each cathode can emit electron currents. CONSTITUTION:When a pulse shaped control signal is applied from a controller 42, to a control grid of an electronic tube 41 in a bias switching switch mechanism 15 in the left side, electron currents are ready to be emitted from a cathode 23 in the left side, and high voltage switches 19, 20 are set, delayed by a prescribed period of time, simultaneously to ON state by means of a signal from its controller 21. Next, a voltage is applied to an X-ray tube 11, and electron currents are emitted only from the cathode 23 along with the emission of X-rays from a left side focal point. And, after said ON state of the high voltage switches 19, 20 is retained only during a prescribed period of time it returns to an OFF state with the completion of an X-ray radiation. And in the same way, a switch mechanism 16 in the right side is actuated, allowing the bias potential to be connected only during a prescribed period of time and to be returned again to the cut-off potential. |
