Patent ID: 6407489
Filing Date: 2002-06-18
Classification: H01J

Abstract:
A shadow mask for a cathode ray tube comprising:a beam-guide member having a substantially rectangular shape with short opposite sides in a vertical axis direction and long opposite sides in a horizontal axis direction, the beam-guide member comprising a plurality of apertures and tie bars interconnecting neighboring apertures in the vertical and horizontal axis directions, each aperture having an opening portion and a tapering portion surrounding the opening portion; and a skirt extended from the beam-guide member with a bent end portion; wherein the beam-guide member is structured such that the relation of a length A of a tie bar in the vertical axis direction to a pitch Pv between the neighboring apertures in the vertical axis direction satisfies the following condition: 0.05&lE;A/Pv&lE;0.15, and wherein the vertical pitch Pv is established to be in the range of 0.6 mm to about 1.0 mm.