| 摘要 |
PROBLEM TO BE SOLVED: To provide a color cathode-ray tube in which the area adjustment of a screen prepared in a shield cup, in order to improve mis-convergence is made easy, and moreover, precise adjustment is enabled. SOLUTION: To the screens 21 to 24, which are installed using a electricity conductor material of non-magnetism, so that they stand straight from a bottom board 11b to the upper and lower sides of through-holes 31 and 33 on the bottom board 11b, so that the convergence of an electron beam G, located at the center of an in-line and the convergence of the electron beams B and R located at the both ends of the in-line coincide with each other, a spacer 40 is inserted between the screens 21 to 24 on the bottom board 11b using the spacer 40 of the electricity conductor material board of non-magnetism, which has been made into the size, which can be inserted between the screens 21 to 24, and has been opened with the through-holes 51 to 53 for every electron beams individually. By inserting this, the area, which is orthogonal to the magnetic flux of the screens 21 to 24, is made variable.
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