Cathode ray tube apparatus

A cathode ray tube apparatus comprising:

• a vacuum enclosure defining a tube axis Z and including,
• a panel having a rectangle-shaped phosphor screen and an outer surface which crosses the tube axis at substantially a right angle,
• a neck provided with an electron gun disposed opposite to said phosphor screen, and
• a yoke portion connected to said neck;
• a funnel portion provided between said yoke portion and said panel and connecting said yoke portion to said panel;
• and
• a deflection yoke fixed on an outer surface region from said yoke portion to said neck of said vacuum enclosure,
• said deflection yoke configured to deflect an electron beam emanated from said electron gun to scan said screen with an aspect ratio of M:N,
• said panel having an outer curvature radius equal to or greater than twice an effective diagonal length of said screen where a circular approximation is assumed for the outer configuration of said panel and the outer curvature radius is defined based on a difference in a tube axis direction between the center of the screen and diagonal edges of said screen,
• wherein cross-sections of the yoke portion perpendicular to the tube axis have outer radii between the outer surface of the yoke portion and the tube axis, and at least one of the outer cross-sections of said yoke portion is non-circular and includes a maximum outer radius between vertical and horizontal directions of said screen,
• wherein a reference deflection position is located at a rated deflection angle defined between two lines extending from the tube axis to the diagonal edges, and
• wherein axial lengths LA, SA, and DA are defined between the tube axis Z and intersection points of the horizontal, vertical and diagonal axes H, V and D and the outer periphery of the yoke portion in a plane perpendicular to the tube axis at the reference deflection point, respectively, and
• wherein the following equation is established:
• (M+N)/2(M.sup.2 +N.sup.2).sup.1/2 <(SA+LA)/(2DA).ltoreq.0.86
• whereby sufficient anti-implosion strength is achieved with reduced deflection power consumption.