| 摘要 |
PROBLEM TO BE SOLVED: To solve the problem where a quadrupole lens for reducing astigmatism due to deflecting magnetic field for self-convergence produces hale to lower resolution with respect to R and B beam spots at both ends of three electron beams in the electron beam correcting method and manufacture of electron gun structure of an inline-type picture tube. SOLUTION: A quadrupole lens has at least the first focusing electrode, to which first focusing voltage Ec3s with a fixed value and the second focusing electrode, to which second focusing voltage Ec3d that varies synchronously with deflecting the electron beam, and produces a force, between the first and second focusing electrodes, to focus the electron beam in either horizontal or vertical direction depending on which voltage is higher, the first focusing voltage Ec3s or the second focusing voltage Ec3d. This invention is featured with an electron beam correction method of the quadrupole lens in the horizontal and vertical directions equal in intensity for the central beam and side beams in the horizontal lens, while making different in the vertical lens, and an electron gun that is obtained by this method.
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