Shadow mask for cathode ray tube

摘要

A shadow mask for a cathode ray tube includes 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 is provided with a plurality of apertures and tie bars interconnecting the neighboring apertures in the vertical and horizontal axis directions. Each aperture has an opening portion and a tapering portion surrounding the opening portion. A skirt with a bent end portion is extended from the beam-guide member. The beam-guide member is structured such that the relationship of a length A of the 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<=APv<=0.15.