公开(公告)号：US06495949B1

公开(公告)日：2002-12-17

申请号：US09704938

申请日：2000-11-02

申请人： Jae Dong Park ,  Hen Seg O

发明人： Jae Dong Park ,  Hen Seg O

IPC分类号： H01J120

CPC分类号： H01J1/20 ,  H01J1/142

摘要： An electron tube cathode is disclosed, comprising a base, electron emissive material layers formed on the base and containing alkaline earth metal oxides including barium, and reducing metal layers interposed between the emissive material layers. The metal layers comprise at least one metal selected from W, Mo, Ta and Ti. The metal layers further comprise any one of rhenium, yttrium or a mixture thereof in the amount of 3 to 5 wt % thereof. The amount of the entire metal layer is 8 to 15 wt % of the entire emissive layer comprising the emissive material layers and the metal layers. The entire metal layer has a thickness of 3 to 5 &mgr;m. Each of the metal layers comprise at least one or more layers formed by means of a spraying method. The present invention provides advantages of enhancing emission characteristics and life characteristics of the cathode by increasing the amount of free Ba. The present invention further provides advantages of enabling an operation of the cathode at a lower temperature due to an increase of the radiant heat of the metal layer and the temperature of the cathode. The present invention also serves to enhance life characteristics of the cathode at a high current density of 3A/cm2 as well as thermal characteristics of the cathode and reduce electric power consumption.

摘要翻译： 公开了一种电子管阴极，其包括在基底上形成的碱性电子发射材料层，并且含有包含钡的碱土金属氧化物和介于发射材料层之间的还原金属层。 金属层包含选自W，Mo，Ta和Ti中的至少一种金属。 金属层还含有3〜5重量％的铼，钇或其混合物中的任一种。 整个金属层的量为包含发射材料层和金属层的整个发光层的8至15重量％。 整个金属层的厚度为3〜5μm。 每个金属层包括通过喷涂方法形成的至少一个或多个层。本发明通过增加游离Ba的量来提供增强阴极的发射特性和寿命特性的优点。 本发明还提供了由于金属层的辐射热和阴极的温度升高而能够在较低温度下操作阴极的优点。 本发明还用于在3A / cm2的高电流密度以及阴极的热特性下改善阴极的寿命特性并降低电力消耗。