Cathode-ray tube having improved yoke mounting part

Abstract

The disclosed cathode-ray tube has a pyramidal yoke mounting part defined to extend from a joint with the neck to at least the end of a deflection yoke on the side of the screen, the yoke mounting part including: an inside profile having a form protruding towards a tubular axis in the direction of major and minor axes based on a diagonal axis so as to have a functional relation with a deflection angle; and an outside profile having a rectangular form with respect to the major and minor axes, the outside profile having a ratio of a maximum thickness to a minimum thickness on the same axis being either of the minor or major axis in the range from 1.0 to 1.5. It satisfies a relation 0.7<Rov/Roh&lE;1.0, wherein Roh is a radius of outer curvature in the direction of the major axis and Rov is a radius of outer curvature in the direction of the minor axis. Also, when a tubular axis ranging from the joint with the neck to the end of the deflection yoke is divided into equal &ldquo;n&rdquo; parts, a value of Td/Tv or Td/Th is in the range from 0.5 to 0.85, wherein Tv, Th and Td are thicknesses in the directions of minor, major and the diagonal axes, respectively, perpendicular to the tubular axis at each length-based position, thereby optimizing the thickness ratio and radii of curvature in the directions of the major and minor axes perpendicular to the tubular axis of the funnel or on the same axis and securing sufficient atmospheric pressure resistance without causing BSN according to wide-angle deflection.