| 摘要 |
PURPOSE:To make it possible to produce an electron gun electrode structure stable and with high accuracy by holding the base of the first cylindrical electrode and the base of the second cylindrical electrode respectively with a magnet while radiating laser light on the overlapped part for its junction. CONSTITUTION:The first and second cylindrical electrodes 10 and 11 by turns inserted into a core metal 17. Thereby, the first cylindrical electrode 10 is sucked by a magnet while the base 10a adheres closely to the magnet 14. Next, the second substrate 15 is made to adhere to a spacer 19 for being pressed. Thereby, a magnetic block 18 is sucked by a magnet 16 while the base 11a of the second cylindrical electrode 11 is pressed by the magnetic block 18 for adhering to the magnet 16. Laser light 20 is radiated from the side for plural- welding the overlapped part of the cylindrical electrodes 10 and 11 from the side for being jointed. Thereby, since the welding by laser light 20 requires no mechanical stress, the highly accurate electrode assembly becomes possible, whereby holding the parallel degree at the time of setting-up and the coaxial degree of holes. |
