| 摘要 |
<p>A color cathode ray tube apparatus having an electron gun wherein an intermediate electrode (GM2) is disposed at a mechanical center between a focus electrode (G3) and an anode electrode (G4) that form a rotationally symmetric bipotential lens, and wherein a disc-like intermediate electrode (GM1) is disposed at a mechanical center between the focus electrode (G3) and the intermediate electrode (GM2). The disc-like intermediate electrode (GM1) has an electron-beam-passing aperture formed therein which is larger in the vertical direction than in the horizontal direction, while the intermediate electrode (GM2) has a circular electron-beam-passing aperture formed therein. To the two intermediate electrodes (GM1,GM2), such voltages that an electron lens is formed which is similar to the one of when there exists no disc-like intermediate electrode (GM1) are applied. As a result, the electron beam can be focused most suitably over the phosphor screen, and elliptical distortion can be reduced, so that a satisfactory image display can be achieved over the phosphor screen.</p> |
