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{| class="https://image.baidu.com/search/detail?ct=503316480&z=0&ipn=d&word=%E7%9C%9F%E7%A9%BA%E7%94%B5%E5%AD%90%E5%99%A8%E4%BB%B6%E9%98%B4%E6%9E%81&step_word=&hs=0&pn=26&spn=0&di=7060663421280190465&pi=0&rn=1&tn=baiduimagedetail&is=0%2C0&istype=0&ie=utf-8&oe=utf-8&in=&cl=2&lm=-1&st=undefined&cs=2944738767%2C2135223248&os=1702516956%2C174283779&simid=3377295908%2C191669329&adpicid=0&lpn=0&ln=586&fr=&fmq=1649345354800_R&fm=&ic=undefined&s=undefined&hd=undefined&latest=undefined©right=undefined&se=&sme=&tab=0&width=undefined&height=undefined&face=undefined&ist=&jit=&cg=&bdtype=0&oriquery=&objurl=https%3A%2F%2Fgimg2.baidu.com%2Fimage_search%2Fsrc%3Dhttp%3A%2F%2Felecfans.com%2FUploadPic%2F2009-10%2F2009101315105127649.gif%26refer%3Dhttp%3A%2F%2Felecfans.com%26app%3D2002%26size%3Df9999%2C10000%26q%3Da80%26n%3D0%26g%3D0n%26fmt%3Dauto%3Fsec%3D1651937385%26t%3D03d91f0e75eb0de292684758cf264bf5&fromurl=ippr_z2C%24qAzdH3FAzdH3Fjsjvuwgf_z%26e3Bv54AzdH3Fpw2fAzdH3F%25El%25lb%25B9%25Em%25lE%25b8AzdH3F&gsm=1b&rpstart=0&rpnum=0&islist=&querylist=&nojc=undefined" style="float:right; margin: -10px 0px 10px 20px; text-align:left"|<center>'''2真空电子器件阴极'''<br><imgsrc="3 https://gimg2.baidu.com/image_search/src=http%3A%2F%2Felecfans.com%2FUploadPic%2F2009-10%2F2009101315105127649.gif&refer=http%3A%2F%2Felecfans.com&app=2002&size=f9999,10000&q=a80&n=0&g=0n&fmt=auto?sec=1651937385&t=03d91f0e75eb0de292684758cf264bf5" width="280"></center><small> 圖片來 自4自百度</small>
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'''真空电子器件阴极'''是在真空电子器件中用于产生电子发射的电极。按供给能量的方式划分，阴极一般可分为热阴极、次极发射阴极、[[光电阴极]]等。用强电场可使阴极表面势垒降低、变窄，从而使电子逸出，这样的发射体称为场致发射阴极。[[真空电子器件]]要求阴极具有发射电流密度大、稳定、寿命长等性能。