Picture display device.

摘要

Picture display device comprising a display tube with an electron gun having a tubular structure with an outer surface and an inner surface on which a helical resistance structure is provided in a layer of a material having a high electrical resistance for constituting a focusing lens. In the layer is also formed a coaxial correction element for generating an electric multi-pole field. The outer surface is provided with electrodes of readily electrically conducting material arranged opposite the correction element for capacitively coupling a dynamic correction signal into the correction element.