ELECTRONIC APPARATUS
    1.
    发明公开
    ELECTRONIC APPARATUS 审中-公开
    电子设备

    公开(公告)号:EP1820257A2

    公开(公告)日:2007-08-22

    申请号:EP05762156.7

    申请日:2005-07-22

    发明人: MILLER, Rodney

    IPC分类号: H02N11/00

    CPC分类号: H01J3/20 G21K1/08 H01J3/24

    摘要: The invention provides a device for producing and focussing an electron beam; the device comprising an evacuated chamber (4), a source of electrons (2), a target (6), means for creating an electric field to accelerate a stream of the electrons constituting the electron beam through the chamber towards the target, and means (12) for providing a magnetic field crossing the electron beam; characterised in that the magnetic flux of the magnetic field progressively reduces in the direction of the target.