Patent ID: 7019451
Filing Date: 2006-03-28
Classification: H01J

Abstract:
1. A color cathode-ray tube including a panel having a fluorescent screen formed on the inner surface thereof, a funnel coupled to the panel, an electron gun mounted into a neck portion of the funnel for emitting electron beams toward the fluorescent screen, and a shadow mask mounted on the fluorescent screen formed on the inner surface of the panel and having a predetermined distance from the fluorescent screen for carrying out the color selection, wherein the shadow mask has a substantially rectangular shape containing a longer axis and a shorter axis and including a plurality of beam-through apertures and a vertical pitch of the beam-through apertures is between 0.15 mm and 0.35 mm; the vertical pitch of the beam-through apertures increases as it goes from a central portion to an end portion of the shorter axis of the shadow mask; the vertical pitch of the beam-through apertures formed at the central portion of the shadow mask is called PVo, and satisfies the following expression: the vertical pitch of the beam-through apertures formed at the end portion of the shorter axis of the shadow mask is called PVt and the following expression is satisfied: