| 摘要 |
PURPOSE:To prevent the thermal breakage of the resistance by using plural number of a support for supporting each electrode of an electron gun at least one support of which has a step in the longitudinal section so as to form a thin section and a thick section and by inserting the resistance into said thin section. CONSTITUTION:The electron gun comprises an electron-beam-producing part 5, a main lens part for focusing a beam which consists of electrodes 11-15, electrode supports 2a and 2b for the electrodes 11-15 and a thin-plate-like resistance 3. The longitudinal section of the electrode support 2b extending along the axis of the beam has a step 60 which divides the support 3b into a thin section and a thick section. The resistance 3 is attached to the thin section to apply necessary voltage to each electrode. Because of the above structure, it is possible to secure a sufficient space for the resistance 3 and therefore the resistance 3 can be large enough. Consequently, it is possible to effectually prevent the thermal breakage of the electron gun.
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