| 摘要 |
PURPOSE:To obtain a dispenser electrode having characteristics such as long life, high current density, and high speed, by welding a cathode cylinder, metal disc and heater cylinder simultaneously, and thus by achieving airtight enclosure of Bariumscandite agent. CONSTITUTION:A circular porous electrode base plate 21 formed into a curved surface is brazed to a cathode cylinder 221 via a filter metal 27 applied on the periphery of the base plate 21. Bariumscandite agent 26 is enclosed in a space 22a formed between the porous base plate 21 and the cathode cylinder 221. A metal disc 23 is fitted to the flange part of the cathode cylinder 221 for airtight sealing of the space 22a. A heater cylinder 222 which has a flange part and which houses a heater 25 is fixed to the other side of the metal disc and a heater 25 padded with a space filler is placed in the heater cylinder 222. The cathode cylinder 221, metal disc 23 and heater cylinder are welded together through a welding part 29. |
