| 摘要 |
An electron gun includes an electron beam generating portion for generating electron beams (cathodes K, a G1 electrode and a G2 electrode) and an electron beam focusing portion (a G3 electrode, a G4 electrode, a G5A electrode, a G5B electrode, a G5C electrode and a G6 electrode). The electron beam focusing portion includes a first focus adjusting lens portion for varying a diverging angle of the electron beams likewise in both of a horizontal direction and a vertical direction and a second focus adjusting lens portion capable of making a focus adjustment of the electron beams independently of the first focus adjusting lens portion. Accordingly, it is possible to adjust various kinds of focus states with a single kind of structure of the electron gun.
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