| 摘要 |
PURPOSE: An electrode assembly and a dynamic focus electron gun using the same are provided to improve distortion of an electron beam and focus characteristic and improve reliability of a breakdown voltage. CONSTITUTION: An electrode gun having two quadruple lens comprises triple cathodes(41), a control electrode, a screen electrode(43), a first to a fifth focus electrodes(44-48), and a final acceleration electrode(49). A static voltage is applied to the screen electrode(43) and the second focus electrode(45). A first dynamic focus voltage of parabolic waveform is applied to the fourth focus electrode(47). The first dynamic focus voltage decreases from a center of the screen to the boundary of the screen. A second dynamic focus voltage parabolic waveform is applied to the first, the third and the fifth electrodes(44,46,48). The second dynamic focus voltage increases from the center of the screen to the boundary of the screen.
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