| 摘要 |
<p>A cathode-ray tube capable of performing dynamic convergence correction without distorting a spot or deteriorating focus. The cathode-ray tube deflects two electron beams (E1, E2) which have passed through a main focus lens. A convergence electrode (10) has an inner electrode plate (11) to which a first voltage is applied and an outer electrode plate (12) which opposes to the inner electrode plate and to which a second voltage lower than the first voltage is applied. The cathode-ray tube includes an electron gun (7) having the convergence electrode (10) and a focus electrode (G4) to which parabolic dynamic focus voltage which has been synchronized with the horizontal deflection cycle and amplitude-modulated by the vertical deflection cycle is applied. The focus electrode (G4) and the outer electrode plate (12) of the convergence electrode (10) are coupled by an electrostatic capacity (C), so as to dynamically change the second voltage applied to the outer electrode plate, thereby performing dynamic convergence correction.</p> |
