| 摘要 |
PURPOSE:To obtain a cathode-ray excellent in mechanical strength by providing the specific relations respectively in height of the skirt part of the end part forming substantially a rectangular frame of the glass panel face part and in thickness among the vertical axis direction, horizontal axis direction and diagonal axis direction near the rectangular frame. CONSTITUTION:The height of the skirt parts in the respective axial directions of the face part, CHV, CHH and CHD as well as the thickness tv, tH and tD near the rectangular frames in the respective axial directions of the face part are so constituted as to have the relations CHV<=CHH<=CHD, further tv>=tH>= tD. In order to constitute the height of the skirt parts in the respective directions of the glass panel and the thickness near the rectangular frames in the respective directions of the face part in this way, it is effective to make the outer surface radiuses of curvature Rv, RH and RD as well as the inner surface radiuses of curvature R'v, R'H and R'D in the respective directions of the face plate to be Rv<RH<RD and R'v<R'H <R'D. Thereby, since the thickness of the upper end in the screen vertical axis direction, in which the mechanical expansion stress due to atmospheric pressure becomes maximum, is formed sufficiently large sharply improve mechanical strength can be obtained. |
