Patent ID: 6906454

Claim:
A shadow mask for a cathode ray tube, comprising: an aperture area including a plurality of apertures through which electron beams pass, the aperture area having a front surface, a center, and a circumference; a non-aperture area extending a predetermined distance from the circumference of the aperture area; and a skirt formed extending a predetermined distance from an outer circumference of the non-aperture area at a predetermined angle to the aperture area and the non-aperture area, wherein the front surface of the aperture area satisfies the following conditions, 100%< RMV′/RMV <110% 120%< RMS/RMV ′<150% where RMV is a vertical radius of curvature of the front surface of the aperture area with respect to a vertical direction passing through a center of the aperture area, RMS is a vertical radius of curvature of the front surface of the aperture area with respect to a short side of the aperture area, and RMV′ is a vertical radius of curvature of the front surface of the aperture area with respect to the vertical direction at a location on a horizontal axis passing through the center of the aperture area.