| 摘要 |
PURPOSE:To realize a magnetic levitating action with a high accuracy, by furnishing an intermittent contact device to contact softly and intermittently to a portion of the peripheral metallic tube body of a rotor, at a portion of a vacuum container around the rotor, which supports a rotary anode target. CONSTITUTION:At a portion of a smaller diameter container 13 of a vacuum container 11 around a rotor 15, an intermittent contact device 41 is installed airtight in a vacuum. While the rotor 15 is rotating, a current flows in the electromagnetic coil, a movable rod is pulled to a core against the elasticity of a spring, the current to the coil is cut off in a very short time with a long interval, and a contactor 48 contacts softly and intermittently to a metal ring 26a of the rotor 15. To an anode target 16, a high potential is kept to apply constantly, and the off and on control of the electron beams is performed by a control grid of a cathode fitting 17. Therefore, the rotor can be kept in a magnetic levitation almost perfectly and rotated at a high speed.
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