| 摘要 |
<p>A shadow mask is arranged to face an inner surface of a substantially rectangular face panel. The shadow mask has a substantially rectangular mask body which has a number of apertures for passing an electron beam, and a rectangular mask frame which supports a peripheral edge portion of the mask body. The mask body is curved in a short axis direction, and is fixed to the mask frame in a state that an internal stress of a direction making small a radius of curvature of the short axis direction is applied. The shadow mask is manufactured in a manner that a rectangular flat mask is plastically deformed so as to prepare the mask body having a curved surface such that a relation between a radius of curvature Rc of the short axis direction in the vicinity of the long axis and a radius of curvature Ra of the short axis direction in the vicinity of a long side becomes Rc < Ra, and thereafter, the mask body is fixed to the mask frame in a state of being elastically deformed in a direction in which a radius of curvature of the short axis direction becomes large.</p> |
