| 摘要 |
PROBLEM TO BE SOLVED: To suppress deterioration of visibility for flatness of a panel glass, by securing strength of a vacuum enclosure by forming the inner surface of a panel comprising a flat outer surface and an inner surface having a center part protruded toward the outer surface into a curved surface satisfying a relation with the shape of a phosphor screen. SOLUTION: In this cathode ray tube, an almost rectangular phosphor screen 14 having a horizontal direction M, a vertical direction N and an aspect ratio of M:N is formed on the inner surface of a panel 12, and when amounts of drop from the center of the inner surface at those locations separated by a distance (r) from the center of the inner surface of the panel 12 on the horizontal axis, the vertical axis and the diagonal axis of the phosphor screen 14 are set forΔH(r),ΔV(r),ΔD(r) respectively, the inner surface of the panel 12 is formed into a curved surface satisfying the formula I and the formula II. When the amount of sinking on the diagonal axis of the phosphor screen 14 of the panel 12 is the maximum amount of sinkingΔD(rMax), it is preferably within a range of 5-20 mm. Thereby, reduction of strength can be avoided by enhancing workability of a shadow mask.
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