| 摘要 |
<p>A cathode ray tube includes a vacuum envelope (23) having a substantially rectangular panel (20), a funnel (21) formed contiguous to the panel, and a cylindrical neck (22) formed contiguous to a small-diameter end portion of the funnel, an electron gun assembly (47) disposed in the neck to generate electron beams, a substantially rectangular phosphor screen (44) arranged on an inner surface of the panel on a funnel side to generate luminescence upon impingement of the electron beams, and a deflection yoke (48) mounted on an outer side of the funnel near a neck side over a predetermined range (24) along a first axis parallel to a normal to the phosphor screen, to generate a magnetic field in the funnel, deflect the electron beams along second and third axes perpendicularly intersecting the first axis and perpendicularly intersecting each other, and scan the phosphor screen. Within the predetermined range of the funnel, of inner and outer shapes of the funnel, at least the inner shape from the neck side toward the panel side is formed to have a section which is gradually deformed from a circular shape to a non-circular shape having a maximum diameter along a direction other than the second and third axes. The predetermined range of the funnel includes a region where, on an orthogonal coordinate system having the first axis as the origin and the second and third axes as coordinate axes, an angle between the second axis and a straight line connecting the origin and a position where the diameter becomes the maximum is different from an angle between a diagonal axis of the panel and the second axis depending on a position within the predetermined range along the first axis. <IMAGE></p> |
