Compound cathode having nano-carbon tube as field emission body with electronic multiplier grid-control function

The invention relates to an important improvement to electron beam transmitting negative electrode in the current vacuum apparatus, it applies to substitute the traditional thermal electron transmitting negative electrode. A nanometer carbon film is arranged in the compound negative electrode shell to be used as field emission incipient body and the micro connection channel board with electron multiplexing function substituting the gate electrode, the compound negative shell out of the micro channel is formed into a one stage focusing stage and two stage focusing stages, it leads out electric vacuum apparatus to out of the shell through leading out pins, the pins are insulated. 本发明涉及对现有电真空器件中电子束发射阴极的重大改进，适用于在各种X线管或其它相关电真空产品中代替传统热电子发射(直热式、间热式)阴极。其特征在于：在复合阴极外壳内设有纳米碳管膜片作为场致发射原初发射体和替代栅极的具有电子倍增功能的微通道板，在微通道板外侧的复合阴极外壳成型为一级聚焦台阶和二级聚焦台阶，通过发射极、栅极、阴极外壳引出管脚引出电真空器件外壳外，管脚间相互绝缘。本发明目的在于不仅要解决热电子发射阴极功耗大，工作寿命有限、体积大，制造成本高和热惯性大，不利于快速开断等缺点，同时还要解决新型纳米碳管栅控损失总发射电流较小从而限制了其应用范围等方面存在的问题。