| 摘要 |
In a focusing electrode system in an electron gun for a color cathode ray tube, distortion of an electron beam, that takes place when horizontal and vertical diameters of a main focusing lens are different is corrected by adjusting power of a dynamic four polar lens. The system includes a first focusing electrode adapted to have applied a static voltage, and a second focusing electrode adapted to have applied a dynamic voltage synchronous to a deflection of electron beams. The second focusing electrode includes, one end having a burring part on a circumference of each of three electron beam pass-through holes at upper and lower portions thereof. A size of the burring part of the electron beam pass-through hole at a center thereof is different from a size of the burring part on each of the electron beam pass-through holes at outer portions thereof. The other end has a single electron beam pass-through hole that is identical to a single electron beam pass-through hole in one end of an anode electrode and an electrostatic field control electrode provided inside that is identical to an electrostatic field control electrode provided inside of the anode electrode. The resulting system adjusts diameters of the main focusing lenses to be formed between the second focusing electrode and the anode electrode.
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