| 摘要 |
An X-ray generator comprises a cathode electrode ( 15 ), a grid electrode ( 17 ) for controlling an electron beam (e) generated by the cathode electrode ( 15 ), a focus electrode ( 18 ) for focusing the electron beam (e), and an anode target ( 14 ) for emitting X rays by the collision of the electron beam (e). A bias voltage (Vb) is impressed between the cathode electrode ( 15 ) and the grid electrode ( 17 ) from a bias voltage generating section ( 20 ). A tube voltage (Vt) is impressed on the anode target ( 13 ) from a tube voltage generating section ( 19 ). A voltage dividing section ( 31 ) divides the tube voltage (Vt) to generate a focus voltage (Vf). The effect of a variation in voltage on the formation of a focal point of the electron beam is suppressed by impressing such a focus voltage (Vf) on the focus electrode ( 18 ).
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