| 摘要 |
PURPOSE:To prevent droppage of light emission efficiency and accumulated ionization by integrating the cathode, the anode and the grid thereby facilitating to maintain constant the interval. CONSTITUTION:A doughnut type first insulator 10a is fixed to the opposite ends of a thermionic emission cathode rod 2 then a tubular meshed anode 3 for passing electrons is secured to the outercircumference. While a doughnut type insulator 10b is fixed to the opposite ends of anode and a tubular meshed grid 7 is secured to the outercircumference. The distance betweean the cathode 2 and anode 3 is formed shorter than the average free stroke of electron. With such arrangement, the interval between cathode/anode or anode/grid can be maintained constant easily resulting in a light emission electron tube where droppage of light emission efficiency or accumulated ionization can be prevented. |
