| 摘要 |
PURPOSE:To prevent the generation of color shift by holding a skirt section formed integratedly at the periphery section of a rectangular shadow mask at the eight fixed points on horizontal, vertical, and diagonal axes, in a rectangular mask frame with higher coefficient of thermal expansion than that of the mask. CONSTITUTION:Rectangular electron beam permeation holes 21a with their major sides in the direction of vertical axis Y are perforated regularly in a rectangular shadow mask made of low thermal expansion material such as amber material and a skirt section 22 is formed integratedly in the periphery section of the mask 21. The skirt section 22 is held in a rectangular mask frame 23 made of high thermal expansion material such as pure iron on each of the vertical axis Y, horizontal axis X, and diagonal axis P and Q through fixed points 24. In addition, a shadow mask support body is secured to the side of the frame 23 and a shadow mask frame body is mounted on a panel pin through this support body. As a result, the shadow mask without color shift, screen vibration owing to voices, and the electron beam travel owing to a fall can be obtained. |
