| 摘要 |
PROBLEM TO BE SOLVED: To provide a cathode-ray tube which has a transmittance ratio of a peripheral part to a central part of 0.4-0.6 so as to permit improving contrast, and a panel whose radius of curvature of the inner surface is changed to 1.29 R-4.35 R while using a mask formed of an AK material. SOLUTION: The cathode-ray tube comprises a panel that is a front glass, a funnel that is a rear glass coupled to the panel, a fluorescent surface formed on an inner surface of the panel, a shadow mask provided at a prescribed interval with the fluorescent surface, and an electron gun provided at a neck part of the funnel opposite to the fluorescent surface. The panel is provided in such a manner that the outer surface is made substantially flat, and the inner surface has a prescribed curvature, the transmittance ratio of an end of the effective surface to the central part is controlled to 0.4-0.6, the radius of diagonal curvature of the inner surface of the panel is controlled to 1.29 R-4.35 R (1 R = 1.767 x diagonal length of the effective surface), and the shadow mask is formed with an aluminum killed material (AK material). COPYRIGHT: (C)2004,JPO
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