| 摘要 |
PROBLEM TO BE SOLVED: To provide a color picture tube in which the deterioration of color purity caused by doming hardly occurs, while having a shadow mask with good visibility and superior in molding performance and strength. SOLUTION: The curvature radius of the outer surface of a panel effective part is 10,000 mm or more. When the length in the X axis (major axis) direction of an aperture of the shadow mask is made 2L, s is made a variable to satisfy 0<s<1, and each falling amount difference of the aperture from X=0 to X=sL, and from X=sL to X=L on the X axis is madeΔZ<SB>01</SB>(s),ΔZ<SB>02</SB>(s), and each falling amount difference of the aperture part from X=0 to X=sL and from X=sL to X=L on the long side of the aperture is madeΔZ<SB>11</SB>(s),ΔZ<SB>12</SB>(s), andα(s) is defined byα(s)=(ΔZ<SB>01</SB>(s)/ΔZ<SB>11</SB>(s))/(ΔZ<SB>02</SB>(s)/ΔZ<SB>12</SB>(s)), then, dα(s)/ds≥0.4 is satisfied in at least at a part in a range of 0.2≤s≤0.8. COPYRIGHT: (C)2006,JPO&NCIPI
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