公开(公告)号：US2117636A

公开(公告)日：1938-05-17

申请号：US71715234

申请日：1934-03-24

Applicant: TJOFLAT GERALD B

Inventor： TJOFLAT GERALD B

IPC: H01J1/28

CPC classification number: H01J1/28 ,  Y10T428/12139

公开(公告)号：US2107945A

公开(公告)日：1938-02-08

申请号：US75387534

申请日：1934-11-20

Applicant: GEN ELECTRIC

Inventor： HULL ALBERT W ,  RUGGLES WILLIAM A

IPC: H01J1/28 ,  H01J17/06

CPC classification number: H01J1/28 ,  H01J17/06

公开(公告)号：US10796876B2

公开(公告)日：2020-10-06

申请号：US15983967

申请日：2018-05-18

Applicant: Colorado State University Research Foundation

Inventor： Bao Gia Nguyen ,  John D. Williams ,  Desiree D. Williams ,  Casey C. Farnell ,  Ryan Kenneth Ham ,  Kathryn Elizabeth Greiner

IPC: H01J29/48 ,  H01J9/04 ,  H01J37/02 ,  B33Y40/00 ,  H05H1/48 ,  H01J1/28 ,  H01J37/065 ,  B33Y30/00 ,  H01J29/04 ,  H01J3/02 ,  B22F3/105 ,  H01J27/20

Abstract: A filament assembly can include: a button having a planar emitter region with one or more apertures extending from an emission surface of the planar emitter region to an internal surface opposite of the emission surface; an inlet electrical lead coupled to the button at a first side; an outlet electrical lead coupled to the button at a second side opposite of the first side; and a low work function object positioned adjacent to the internal surface of the planar emitter region and retained to the button. The planar emitter region can include a plurality of apertures. The low work function object can include a porous ceramic material having the barium, and may have a polished external surface. An electron gun can include the filament assembly. An additive manufacturing system can include the electron gun having the filament assembly.

公开(公告)号：US20180158639A1

公开(公告)日：2018-06-07

申请号：US15869352

申请日：2018-01-12

Applicant: KONINKLIJKE PHILIPS N.V.

Inventor： GEORG FRIEDRICH GAERTNER ,  WILHELMUS CORNELIS KEUR

IPC: H01J1/142 ,  C23C14/08 ,  H01J23/04 ,  C23C14/34 ,  H01J1/28

CPC classification number: H01J1/142 ,  C23C14/082 ,  C23C14/3414 ,  H01J1/28 ,  H01J23/04

Abstract: The invention relates to the field of production of barium-scandate dispenser cathodes or other barium-scandate materials. A target (66) containing a mixture of BaO, CaO, Al2O3 and Sc2O3 tends to be more stable, the higher the scandia (scandium oxide) content is. However, an increased scandia content results in a reduced emission capability. A destabilizing effect of BaO and CaO reactions is counteracted by the more inert Sc2O3 and also Al2O3 components, as not only an increased scandia content stabilizes the material but also an increased alumina (aluminum oxide) content improves the stability.

公开(公告)号：US08766522B1

公开(公告)日：2014-07-01

申请号：US13105249

申请日：2011-05-11

Applicant: Steven B Fairchild ,  Benji Maruyama

Inventor： Steven B Fairchild ,  Benji Maruyama

IPC: H01J1/14 ,  H01J1/304 ,  H01J29/46 ,  H01J1/28

CPC classification number: H01J1/28 ,  H01J1/304 ,  H01J1/3042 ,  H01J9/025 ,  H01J11/40 ,  H01J25/34 ,  H01J29/467 ,  H01J2201/304 ,  H01J2201/3043 ,  H01J2201/30469 ,  H01J2329/0431 ,  H01J2329/0455

Abstract: Improved field emission cathodes comprise a fiber of highly aligned and densely packed single-wall carbon nanotubes, double-wall carbon nanotubes, multi-wall carbon nanotubes, grapheme nanoribbons, carbon nanofibers, and/or carbon planar nanostructures. The fiber cathodes provide superior current carrying capacity without degradation or adverse effects under high field strength testing. The fibers also can be configured as multi-fiber field emission cathodes, and the use of low work function coatings and different tip configurations further improves their performance.

Abstract translation: 改进的场发射阴极包括高度排列和密集堆叠的单壁碳纳米管，双壁碳纳米管，多壁碳纳米管，图形纳米带，碳纳米纤维和/或碳平面纳米结构的纤维。 纤维阴极在高场强测试下提供卓越的载流能力而不降解或不利影响。 纤维也可以配置为多纤维场发射阴极，并且使用低功函数涂层和不同尖端配置进一步提高其性能。

公开(公告)号：US07710009B2

公开(公告)日：2010-05-04

申请号：US11650310

申请日：2007-01-05

Applicant: Stijn Willem Herman Karel Steenbrink ,  Pieter Kruit

Inventor： Stijn Willem Herman Karel Steenbrink ,  Pieter Kruit

IPC: H01J19/14 ,  H01J1/20 ,  H01J1/14 ,  H01J1/28

CPC classification number: H01J37/065 ,  B82Y10/00 ,  B82Y40/00 ,  H01J1/28 ,  H01J37/3177 ,  H01J2237/3175 ,  H01J2237/31754 ,  H01J2237/31774

Abstract: A dispenser cathode which comprises an emission surface, a reservoir for material releasing, when heated, work-function-lowering particles, and at least one passage for allowing diffusion of work-function-lowering particles from said reservoir to said emission surface, said emission surface comprising at least one emission area and at least one non-emission area covered with emission-suppressing material and surrounding each emission area, said non-emission area comprising at least one passage connecting said reservoir with said non-emission area and debouching within a diffusion length distance from an emission area for allowing diffusion of work-function-lowering particles from said reservoir to said emission area.

Abstract translation: 分配器阴极，其包括排放表面，用于材料释放的储存器，当被加热时，功能降低颗粒和至少一个通道，用于允许功能降低颗粒从所述储存器扩散到所述发射表面，所述发射 表面包括至少一个发射区域和至少一个覆盖有发射抑制材料并且围绕每个发射区域的非发射区域，所述非发射区域包括将所述储层与所述非发射区域连接的至少一个通道，并在 从放射区域的扩散长度距离，用于允许功能降低颗粒从所述储存器扩散到所述发射区域。

公开(公告)号：US07215070B2

公开(公告)日：2007-05-08

申请号：US10778787

申请日：2004-02-13

Applicant: Stijn Willem Herman Karel Steenbrink ,  Pieter Kruit

Inventor： Stijn Willem Herman Karel Steenbrink ,  Pieter Kruit

IPC: H01J19/14 ,  H01J1/20 ,  H01J1/14 ,  H01J1/28

CPC classification number: H01J37/065 ,  B82Y10/00 ,  B82Y40/00 ,  H01J1/28 ,  H01J37/3177 ,  H01J2237/3175 ,  H01J2237/31754 ,  H01J2237/31774

Abstract: A dispenser cathode which comprises an emission surface, a reservoir for material releasing, when heated, work-function-lowering particles, and at least one passage for allowing diffusion of work-function-lowering particles from said reservoir to said emission surface, said emission surface comprising at least one emission area and at least one non-emission area covered with emission-suppressing material and surrounding each emission area, said non-emission area comprising at least one passage connecting said reservoir with said non-emission area and debouching within a diffusion length distance from an emission area for allowing diffusion of work-function-lowering particles from said reservoir to said emission area.

Abstract translation: 分配器阴极，其包括排放表面，用于材料释放的储存器，当被加热时，功能降低颗粒和至少一个通道，用于允许功能降低颗粒从所述储存器扩散到所述发射表面，所述发射 表面包括至少一个发射区域和至少一个覆盖有发射抑制材料并且围绕每个发射区域的非发射区域，所述非发射区域包括将所述储层与所述非发射区域连接的至少一个通道，并在 从放射区域的扩散长度距离，用于允许功能降低颗粒从所述储存器扩散到所述发射区域。

公开(公告)号：US20060028114A1

公开(公告)日：2006-02-09

申请号：US10778787

申请日：2004-02-13

Applicant: Stijn Willem Herman Steenbrink ,  Pieter Kruit

Inventor： Stijn Willem Herman Steenbrink ,  Pieter Kruit

IPC: H01J1/28

CPC classification number: H01J37/065 ,  B82Y10/00 ,  B82Y40/00 ,  H01J1/28 ,  H01J37/3177 ,  H01J2237/3175 ,  H01J2237/31754 ,  H01J2237/31774

Abstract: A dispenser cathode which comprises an emission surface, a reservoir for material releasing, when heated, work-function-lowering particles, and at least one passage for allowing diffusion of work-function-lowering particles from said reservoir to said emission surface, said emission surface comprising at least one emission area and at least one non-emission area covered with emission-suppressing material and surrounding each emission area, said non-emission area comprising at least one passage connecting said reservoir with said non-emission area and debouching within a diffusion length distance from an emission area for allowing diffusion of work-function-lowering particles from said reservoir to said emission area.

Abstract translation: 分配器阴极，其包括排放表面，用于材料释放的储存器，当被加热时，功能降低颗粒和至少一个通道，用于允许功能降低颗粒从所述储存器扩散到所述发射表面，所述发射 表面包括至少一个发射区域和至少一个覆盖有发射抑制材料并且围绕每个发射区域的非发射区域，所述非发射区域包括将所述储层与所述非发射区域连接的至少一个通道，并在 从放射区域的扩散长度距离，用于允许功能降低颗粒从所述储存器扩散到所述发射区域。

公开(公告)号：US5990608A

公开(公告)日：1999-11-23

申请号：US975248

申请日：1997-11-21

Applicant: Tetsuya Shiroishi

Inventor： Tetsuya Shiroishi

IPC: H01J1/20 ,  H01J3/02 ,  H01J29/04 ,  H01J37/065 ,  H01J1/28 ,  H01J29/48

CPC classification number: H01J3/029 ,  H01J1/20 ,  H01J29/04

Abstract: An electron gun provides an improved focusing characteristic of electron beams surely and effectively, and permits position alignment to be relatively easy in assembling thereof. In an electron gun which includes a cathode for discharging electrons and a plurality of grids each having electron passing-through holes for guiding the electrons discharged from the cathode unidirectionally, an electron dischargeable region is formed in an electron discharging plane of the cathode, which is band-shaped. In addition, the length of the band-shaped area constituting the electron dischargeable region on its shorter side is less than 80% of the diameter of the area from where electrons are discharged when a practical maximum current is taken out without limiting the electron dischargeable region.

Abstract translation: 电子枪确保和有效地提供电子束的改进的聚焦特性，并且允许位置对准在组装时相对容易。 在包括用于放电电子的阴极的电子枪和多个具有用于引导从阴极单向排出的电子的电子通过孔的栅格中，在阴极的电子放电平面中形成电子放电区域，这是 带状。 此外，构成电子可放电区域的短边的带状区域的长度小于当取出实际最大电流时电子排出的区域的直径的80％，而不限制电子可放电区域 。

公开(公告)号：US5881355A

公开(公告)日：1999-03-09

申请号：US120373

申请日：1998-07-22

Applicant: Toshikazu Sugimura ,  Maki Narita ,  Taro Hirai ,  Shoichi Hata

Inventor： Toshikazu Sugimura ,  Maki Narita ,  Taro Hirai ,  Shoichi Hata

IPC: H01J9/04 ,  C22C1/05 ,  C22C32/00 ,  H01J1/28 ,  B22F1/00

CPC classification number: C22C1/05 ,  C22C32/0026 ,  H01J1/28 ,  B22F2998/10 ,  B22F2999/00

Abstract: A method of fabricating a cathode member or pellet is provided, which realizes the sufficiently large increase of the electron emission capability by the current activation process and that prevents the maximum cathode current from being lowered as long as an electron emissive agent exists in the cathode member. First, (a) a nickel powder and a rare-earth-metal oxide powder are provided. (b) The nickel powder and the rare-earth-metal oxide powder are uniformly mixed together, thereby producing a first powder mixture. (c) The first powder mixture is heated in a hydrogen atmosphere, an inert atmosphere, or a vacuum atmosphere, thereby producing an intermetallic compound of nickel and the rare-earth metal in the first powder mixture. (d) The first powder mixture containing the intermetallic compound is uniformly mixed with an electron-emissive agent powder, thereby producing a second powder mixture. (e) The second powder mixture is sintered by a HIP process, thereby forming a cathode member. The intermetallic compound produced in the first powder mixture has a function to chemically decompose the electron emissive agent to thereby increase the electron emission performance of the electron emissive agent.

Abstract translation: 提供一种制造阴极部件或丸粒的方法，其通过电流活化过程实现了电子发射能力的足够大的增加，并且只要阴极部件中存在电子发射剂，就可以防止最大的阴极电流降低 。 首先，提供（a）镍粉和稀土金属氧化物粉末。 （b）将镍粉末和稀土金属氧化物粉末均匀混合，制成第一粉末混合物。 （c）将第一粉末混合物在氢气氛，惰性气氛或真空气氛中加热，由此在第一粉末混合物中产生镍和稀土金属的金属间化合物。 （d）将含有金属间化合物的第一粉末混合物与电子发射剂粉末均匀混合，从而产生第二粉末混合物。 （e）通过HIP工艺烧结第二粉末混合物，从而形成阴极部件。 在第一粉末混合物中产生的金属间化合物具有化学分解电子发射剂的功能，从而增加电子发射剂的电子发射性能。