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    • 10. 发明公开
    • X-RAY TUBE
    • RÖNTGENRÖHRE
    • EP2838106A1
    • 2015-02-18
    • EP13776367.8
    • 2013-04-08
    • Kabushiki Kaisha ToshibaToshiba Electron Tubes & Devices Co., Ltd.
    • KANASAKI, HiroshiTAKAHASHI, HideyukiMIMORI, KeiichiUEKI, Masataka
    • H01J35/06H01J35/14
    • H01J35/06H01J35/14H01J2235/1046H01J2235/1086
    • An X-ray tube is provided with an anode target, a cathode comprising an electron emission source and a convergence electrode, and a vacuum envelope. The convergence electrode includes a groove portion (16) in which the electron emission source is housed, and converges an electron beam. The groove portion (16) has a nearest inner peripheral wall (53), an upper inner peripheral wall (51) and a lower inner peripheral wall (52). The nearest inner peripheral wall (53) is shorter than the dimension of the electron emission source in the depth direction of the groove portion and faces the electron emission source over the entire periphery with a narrowest clearance therebetween in the width direction of the groove portion. The upper inner peripheral wall (51) is located on the open side of the groove portion from the nearest inner peripheral wall (53) and has a shape wider than the nearest inner peripheral wall (53) in the width direction. The lower inner peripheral wall (52) is located on the side opposite to the upper inner peripheral wall (51) with respect to the nearest inner peripheral wall (53), and has a shape wider than the nearest inner peripheral wall (53) in the width direction.
    • X射线管设置有阳极靶,包括电子发射源和会聚电极的阴极和真空外壳。 会聚电极包括容纳电子发射源的凹槽部分(16),并且会聚电子束。 槽部(16)具有最近的内周壁(53),上内周壁(51)和下内周壁(52)。 最近的内周壁(53)比凹槽部分的深度方向上的电子发射源的尺寸短,并且在凹槽部分的宽度方向上在整个周边面对电子发射源,其间具有最小的间隙。 上部内周壁(51)从最近的内周壁(53)位于槽部的开口侧,并且在宽度方向上具有比最近的内周壁(53)宽的形状。 下内周壁(52)相对于最近的内周壁(53)位于与上内周壁(51)相反的一侧,并且具有比最近的内周壁(53)更宽的形状 宽度方向。