Cathode ray tube

Abstract

This cathode ray tube includes a vacuum envelope having a substantially rectangular panel, a funnel formed contiguous to the panel, and a cylindrical neck formed contiguous to the small-diameter end portion of the funnel, an electron gun assembly disposed in the neck to generate electron beams, and a deflection yoke mounted on the outer side of the funnel near the neck side over a predetermined range to form a magnetic field in the funnel, thereby deflecting the electron beams along the major and minor axes of the panel. Of the predetermined range of the funnel, at the neck side, the funnel is formed to have an outer shape with a section which is gradually deformed, from the neck side to the panel side, from a circular shape to a non-circular shape having a maximum diameter along a direction other than the major and minor axes. The funnel of the predetermined range is formed to have an outer shape with a section that satisfies a relation: 0.3.ltoreq..DELTA.HV/L.ltoreq.0.6 where L is the radius of the maximum diameter, .DELTA.H is the difference between the radius L and a radius H along the major axis, .DELTA.V is the difference between the radius L and a radius V along the minor axis, and .DELTA.HV is the sum of .DELTA.H and .DELTA.V.

Dependencies are inferred from the claim text.