| 摘要 |
PURPOSE:To enable the influence of an induced current to be avoided by adjusting the effective length of the final electrode of an electron-optical system constituting the main lens to be smaller than the effective caliber of the final electrode. CONSTITUTION:The flange 8b of an end hat 8 is attached to an electrode G5. The diameter (la) of the cylindrical section 8a of the end hat 8 is adjusted so that an electron beam can pass through the section 8a. The effective length (DGS) of the electrode (G5) is adjusted to be smaller than its effective caliber (Ca). Even when the electron gun is brought close to the fluorescent screen, the overlap between the final electrode and the deflecting coil is smaller than the conventional one since the effective length of the deflecting coil is smaller than its effective caliber. Accordingly the influence of an induced current can be sufficiently avoided. |
