| 摘要 |
PROBLEM TO BE SOLVED: To provide an X-ray generator that can produce X rays over a longer time and with stability, by operating an X-ray tube efficiently irrespective of the usage conditions. SOLUTION: The X-ray generator 1 comprises the X-ray tube 11, having a cathode part 16, a grid electrode 15 and a target 22, a voltage controller 27 and 32 for controlling the voltages applied to the cathode part 16 and the grid electrode 15, and switches 33 and 34 for switching on and off the X-ray generator 1 and X-ray emission. The voltage controller 27 and 32 applies a positive standby voltage Vf1 to the cathode part 16 and applies a negative cutoff voltage Vc1 to the gird electrode 15, according to an on signal to the X-ray generator 1 and an off signal to X-ray emission. According to the on- signal to the X-ray generator 1 and the on-signal to X-ray emission, a cathode- operating voltage Vf2 higher than the standby voltage Vf1 is applied to the cathode part 16, and a grid-operating voltage Vc2 higher than the cutoff voltage Vc1 is applied to the grid electrode 15.
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