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    ELECTRON EMITTER SOURCE
    3.
    发明申请
    ELECTRON EMITTER SOURCE 审中-公开

    公开(公告)号：US20170148605A1

    公开(公告)日：2017-05-25

    申请号：US15356564

    申请日：2016-11-19

    Applicant: Oregon Physics, LLC

    Inventor： Paul P. Tesch ,  Gerald G. Magera

    IPC: H01J19/10 ,  H01J21/06 ,  H01J19/068 ,  H01J19/38 ,  H01J19/32

    CPC classification number: H01J19/10 ,  H01J19/068 ,  H01J19/32 ,  H01J19/38 ,  H01J19/82 ,  H01J21/06

    Abstract: An electron emitter that consists of: a low work function material including Lanthanum hexaboride or Iridium Cerium that acts as an emitter, a cylinder base made of high work function material that has a cone shape where the low work function material is embedded in the high work function material but is exposed at end of the cone and the combined structure is heated and biased to a negative voltage relative to an anode, an anode electrode that has positive bias relative to the emitter, and a wehnelt electrode with an aperture where the cylindrical base protrudes through the wehnelt aperture so the end of the cone containing the emissive area is placed between the wehnelt and the anode.

    Thermal-field type electron source composed of transition metal carbide material with artificial facet
    4.
    发明授权
    Thermal-field type electron source composed of transition metal carbide material with artificial facet 有权
    由过渡金属碳化物材料与人造面组成的热场型电子源

    公开(公告)号：US09240301B1

    公开(公告)日：2016-01-19

    申请号：US13851732

    申请日：2013-03-27

    Applicant: Applied Physics Technologies, Inc.

    Inventor： William A. Mackie ,  Gerald G. Magera

    IPC: H01J1/14 ,  H01J1/146 ,  H01J19/10 ,  H01J1/148

    CPC classification number: H01J1/148 ,  H01J1/14 ,  H01J1/146 ,  H01J19/10 ,  H01J37/06 ,  H01J2201/196 ,  H01J2201/2889 ,  H01J2201/30484 ,  H01J2201/317 ,  H01J2237/06316

    Abstract: An electron source is made from mixed-metal carbide materials of high refractory nature. Producing field-enhanced thermionic emission, i.e., thermal-field or extended Schottky emission, from these materials entails the use of a certain low work function crystallographic direction, such as, for example, (100), (210), and (310). These materials do not naturally facet because of their refractory nature. The disclosed electron source made from transition metal carbide material is especially useful when installed in a scanning electron microscope (SEM) performing advanced imaging applications that require a high brightness, high beam current source.

    Abstract translation: 电子源由具有高耐火性质的混合金属碳化物材料制成。 从这些材料产生场强增强的热离子发射，即热场或延伸的肖特基发射需要使用某种低功函数的晶体学方向，例如（100），（210）和（310） 。 这些材料由于其耐火性质而不自然而然。 所披露的由过渡金属碳化物材料制成的电子源在安装在需要高亮度，远光束电流源的先进成像应用的扫描电子显微镜（SEM）中是特别有用的。

    LOW ABERRATION, HIGH INTENSITY ELECTRON BEAM FOR X-RAY TUBES
    7.
    发明公开
    LOW ABERRATION, HIGH INTENSITY ELECTRON BEAM FOR X-RAY TUBES 审中-公开
    用于X射线管的低强度，高强度电子束

    公开(公告)号：EP3241228A1

    公开(公告)日：2017-11-08

    申请号：EP15802325.9

    申请日：2015-11-19

    Applicant: General Electric Company

    Inventor： LEMAITRE, Sergio

    IPC: H01J35/06

    CPC classification number: H01J35/06 ,  H01J3/38 ,  H01J19/10 ,  H01J19/48 ,  H01J37/063 ,  H01J2229/4844 ,  H01J2229/4896 ,  H01J2235/06

    Abstract: In the present invention, a cathode for an x-ray tube is formed with a large area flat emitter. To reduce aberrations to a minimum the emission area in the flat emitter has a non-rectangular shape and focusing pads arranged around the emitter. In an exemplary embodiment, the flat emitter has a non-rectangular polygonal shape for an emission area on the emitter in order to increase the emission current from the emitter at standard voltage levels without the need to run the emitters at a higher temperature, add additional emitters to the cathode and/or to coat the emitters with a low work function material.

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