| 摘要 |
A shadow mask for a cathode-ray tube is provided to improve shock resistance and howling characteristics. A color cathode-ray tube including a panel whose outer surface is near flat and whose inner surface has a specific curvature, a funnel set in the rear of the panel, an electron gun set at a neck placed in the rear of the funnel, and a rectangular shadow mask placed at the inner side of the panel, having a predetermined distance from the inner surface of the panel, to select colors of electron beams emitted from the electron gun. When the radius of curvature of the longer axis of the shadow mask is Rx, the radius of curvature of its shorter axis is Ry, and the radius of curvature of its diagonal axis is Rd, these radiuses of curvature are appropriately designed to increase strength of the shadow mask.
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