| 摘要 |
PURPOSE:To obtain the member of a shadow mask and such that can achieve a fine color picture tube easy to observe with exceedingly small color shift by creating a substrate whose primary components are Fe and Ni and applying heat treatment in oxidizing gas. CONSTITUTION:When at least either one of a shadow mask 6, a frame 7, and an inner shield 8 is manufactured, a substrate whose primary components are Fe and Ni is created and then a black coat is formed on the surface of the substrate by heat-treating the substrate in oxidizing gas. As a result, the member for a color picture tube that is provided with the property of small coefficient of thermal expansion owing to the substrate whose primary components are Fe and Ni and the excellent heat dissipation owing to the black coat formed on the surface of the substrate, for example, the shadow mask can be manufactured and doming by the temperature rise in operation can be improved sharply. |
