| 摘要 |
PURPOSE:To obtain an accurate spacing between a filament and an anode, and further increase the tension applied to the filament, by providing a filament vertically movable filament support and a screen which pushes down the filament. CONSTITUTION:A filament 2 is extended on an anode 4 with a space determined by the height of the lower end of screen 3 and welded on a filament support body 1. The support body 1 is thereby deformed from U-shape to horseshoe- shape after mounting a screen 3, and by the reaction of that, sufficient tension is applied to the filament 2. Besides, the space between the filament 2 and the anode 4 is determined by the screen 3.
|
