| 摘要 |
A color cathode ray tube is provided with a shadow mask including a substantially rectangular mask body having a large number of electron beam passage apertures, and a substantially rectangular mask frame provided at a peripheral portion of the mask body. The mask frame has a pair of long side walls extending in parallel to the major axis of the mask body and a pair of short side walls extending in parallel to the minor axis of the mask body. Mask holders are respectively provided on the outer surfaces of the long and short side walls, and are engaged with supporting pint provided on a skirt portion of the panel, thereby supporting the shadow mask. The mask frame is formed to satisfy the following relationship:where S1 is the area of the outer surface of the long side wall of the mask frame, t1 is the thickness of the long side wall, S2 is the area of the outer surface of the short side wall, t2 is the thickness of the short side wall, F1 is the pushing pressure acting from the mask holder onto the long side wall when the mask holder is engaged with the supporting pin to support the shadow mask, and F2 is the pushing pressure acting from the mask holder onto the short side wall when the mask holder is engaged with the supporting pin to support the shadow mask.
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