HOT CATHODE GRID CONTROL DISCHARGE TUBE

摘要

PROBLEM TO BE SOLVED: To provide a hot cathode grid control discharge tube capable of stabilizing the operation by enhancing the effect to prevent an oxide which is evaporated from hot cathode from adhering onto grid electrode.SOLUTION: The hot cathode grid control discharge tube 10 includes: a hot cathode 11; a shield electrode 12; an anode 14; a grid electrode 15; and a baffle 13. The shield electrode 12 has a cylindrical shape enclosing the hot cathode 11 and has an opening 22. The anode 14 opposes the opening 22 of the shield electrode 12. The grid electrode 15 is disposed being interposed between the opening 22 of the shield electrode 12 and the anode 14. The baffle 13 is formed to have a larger diameter than that of the opening 22 of the shield electrode 12, and is disposed in an area where the hot cathode 11 and the grid electrode 15 are faced to each other via the opening 22.SELECTED DRAWING: Figure 1