| 摘要 |
An electron gun having an improved circuitry for driving the electron gun, which includes a cathode ray tube accommodating at least a cathode, a control electrode, a first acceleration electrode, a convergence electrode comprising first and second grids sandwiching at least a quadrupole lens and a second acceleration electrode. The circuitry is provided with a voltage divider having first and second ends which are electrically connected between the control electrode and the first grid respectively. The voltage divider being electrically connected to at least a dc power supply to apply a bias between the first and second ends of the voltage divider so that the first and second ends of the voltage divider have first and second voltage levels which are different by the bias from each other. The voltage divider has a voltage dividing point between the first and second ends. The voltage dividing point further has a third voltage level which is leveled between the first and second voltage levels which are applied to the control electrode and the first grid respectively. The voltage dividing point is electrically connected to the first the acceleration electrode so that the first acceleration electrode has the third voltage level.
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