公开(公告)号：US3835327A

公开(公告)日：1974-09-10

申请号：US42024073

申请日：1973-11-29

Applicant: UNITED AIRCRAFT CORP

Inventor： LAWRENCE G

IPC: B23K15/00 ,  H01J37/063 ,  H01J37/065 ,  H01J37/30 ,  H01J37/00 ,  G01N23/00

CPC classification number: H01J37/3005 ,  B23K15/0013 ,  H01J37/063 ,  H01J37/065

Abstract: A high power electron beam machine for operating on a workpiece is disclosed in which the beam focus is automatically maintained constant without the necessity of lens current variation regardless of changes in beam current. The electron gun assembly for the machine consists of a Rogowski gun having a square ribbon filament recessed from an enlarged filament aperture, and a pin type anode with a reduced height and an increased gap from the bias electrode. The electron gun produces a stationary image or apparent source of electrons even though the beam current or the high voltage operating level of the electron gun is varied. Increased life of the ribbon filament is obtained by using a ribbon filament consistng of tungsten with 3 percent rhenium added thereto.

Abstract translation: 公开了一种用于在工件上操作的高功率电子束机器，其中束束聚焦自动保持恒定，而不需要透镜电流变化，而不管射束电流的变化如何。 用于机器的电子枪组件由具有从放大的灯丝孔凹入的方形丝带灯丝的罗戈夫斯基枪和具有降低的高度的引脚型阳极和与偏置电极的间隙增加。 即使电子束的射束电流或高电压工作电平发生变化，电子枪也会产生静止的图像或电子源。 通过使用由添加了3％铼的钨组成的丝带来获得带状丝的寿命。