Patent ID: 6812631
Filing Date: 2004-11-02
Classification: H01J

Abstract:
A glass bulb for a cathode ray tube, comprising a panel and a funnel sealed to each other at the respective seal edge portions to form a sealing portion; whereinsaid panel comprises a face portion having a substantially rectangular screen, and a skirt portion constituting a sidewall of the face portion and having a seal edge portion at its end; said funnel has a seal edge portion having a shape substantially congruent with the seal edge portion of said panel, as an opening portion of its body portion, and the other opening portion is connected to a cylindrical neck portion for housing an electron gun, and a yoke portion is integrally connected between said body and neck portions to form a substantially funnel shape; when a straight line in parallel to the central axis of said neck portion, passing through the center of the inner surface of said face portion, is designated as the bulb's central axis, then the distance H from the center of the inner surface of said face portion to a point where the reference line of the funnel crosses the bulb's central axis, and the diagonal length D of said screen, satisfy D/H&gE;3.3; and in said sealing portion having a substantially rectangular cross sectional shape in the direction perpendicular to the bulb's central axis, a bent portion bending towards the bulb's central axis, is provided at least on a long side of the sealing portion.