| 摘要 |
PURPOSE:To provide an integral implosion-protected cathode ray tube excellent in the implosion-protected effect and suited for mass production, by using thinner auxiliary plate than the reinforced portion of the metal band and thereby providing 3-ply structure all over the joint portion. CONSTITUTION:The stress per unit area of the metal band made of mild steel is approximately 27kg/mm.<2> at the elongation of 0.4%, and therefore approximately 1,015kg of fastening load is provided multiplied by its sectional area, 37.6mm.<2>. Since the stress per unit area of the auxiliary plate 4 made of stainless steel is approximately 31kg/mm.<2> at the elongation of 0.4%, approximately 1,085kg of fastening load is provided multiplied by its sectional area, 35mm.<2>, and thus the load exerting thereon is substantially equal to that exerting on the metal band 1. The metal band 1 is reinforced by the folded portion 3, and at the reinforced portion, the thickness including the folded portion 3 is approximately 1.6mm., against which the auxiliary plate 4 is approximately 1mm. thick. Therefore, at the joint portion between the metal band 1 and the auxiliary plate 4, the auxiliary plate 4 is much thinner than the reinforced portion of the metal band 1, and 3-ply structure is provided all over the joint portion, so that sufficient joint strength is ensured by resistance welding. |
