UN TUBO DE IMAGEN EN COLOR, PERFECCIONADO

摘要

A shadow mask (20) for a color display tube is formed from one piece. Each side of the shadow mask (20) comprises a bulged portion (23) with a collar (24). Having a center of mass which when viewed in a cross-section perpendicular to the side, is situated substantially in the plane of the shadow mask sheet (21). As a result of this no moments are exerted on the shadow mask (20) when vibrations and shocks occur, so that the mask is not deformed. The angle which the collars (24) make with the longitudinal axis of the display tube is such that electrons reflected at a collar (24) do not land within the pattern of apertures (22) on the shadow mask (20). A magnetic screening cap adapted to the shadow mask construction is also constructed so that electrons reflected at the cap do not land within the pattern of apertures (22) of the shadow mask (20).