| 摘要 |
The CRT for getting an uniform convergence of the electron beams generated from three electron guns includes combined convergence electrodes (33) comprising of a first and second grid electrodes (35,36). The one electrode is applied by constant voltage but another one is applied by dynamic voltage which is varied according to the variation of the beam deflection. The vertical lengths of the electron beam holes (40",41") in the first central and second grids are longer than the outer ones (40', 40"', 41', 41"') so that the central and outer electric fields are uniform to deflect the electron beam on the certain spot of the screen.
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