| 摘要 |
PURPOSE:To facilitate the correction of the electron beam locus, by providing a pair of projected bead glass chips for holding the mutual interval of each electrode to surround the electron beam locus while magnetizing by the projected chip. CONSTITUTION:The electron gun 3 is comprised of a cathode 10, G1 electrode 11, G2 electrode 12, G3 electrode 13, G4 electrode 14 and a pair of bead glasses 15, 15 facing each other, where the cathode 10 and the electrodes 11-14 are planted in the glasses 15, 15 to hold the mutual interval. The glass 15 has the magnetizable performance while provided with a plurality of integrally projected chips 15a which are provided between the electrodes 13, 14 to surround the locus of the electron beams 4B, 4G, 4R. The glasses 15, 15 are magnetized by an external magnetizer to provide the field necessary for the correction of the shift of the beams 4B-4R into the locus. With such arrangement fine corrected field distribution can be obtained easily while the shift due to the vibration of the electron beam locus after correction can be prevented. |
