| 摘要 |
<p>A direct heating cathode unit (100) including a metal alloy emitter (110) having at least two parallel lateral surfaces (113, 115) extending crosswise with respect to a longitudinal geometrical axis penetrating a base, two heater wires (120, 150) having central parts (121, 131) welded on both lateral surfaces (113, 115) of the emitter (110), the lateral surfaces (113, 115) being parallel to and facing each other, a cathode holder (150) having current supply holder pins (143, 144), and heater supports (141, 142) to which both ends of the heater wires (120, 130) in a pair are connected to the current supply holder pins (143, 144), and connected to the current supply holder pins (143, 144) such that the vertical axis of the cathode holder (150) coincides with the vertical axis of the emitter (110). An electron gun using the direct heating cathode unit (100) includes a control unit, a screen electrode and a plurality of focusing electrodes, sequentially disposed from the cathode unit (100).</p> |
