| 摘要 |
<p>A color cathode ray tube has an electron gun including at least a cathode (K1,K2,K3), a control electrode (10), an accelerating electrode (20), a focus electrode (30-50) and an anode (60) spaced axially in the order named. The focus electrode includes a first focus electrode (30), a second focus electrode (40) and a third focus electrode (50), the first focus electrode (30) facing the accelerating electrode (20). A first quadrupole lens structure is formed on the first and the second focus electrode, and a second quadrupole lens structure is formed on the second focus electrode and the third focus electrode. A dynamic focus voltage is applied to the first and third focus electrodes so that the first quadrupole lens structure produces horizontally diverging and vertically focusing actions on the electron beam and the second quadrupole lens structure produces horizontally focusing and vertically diverging actions on the electron beam. <IMAGE></p> |
