Colour display tube having an internal magnetic shield.

摘要

Colour display tube of the 3-in-line type having a display screen with a stripe-shaped phosphor pattern. The display tube has an internal shield with a scanning aperture at its gun-sided end for electron beams produced by the gun and scanning the display screen. This scanning aperture extends into the short side walls of the shield while forming an oversized scanning aperture with two pairs of diametrical extreme angular points and a ratio from 1.5 to 1.75 standardized in accordance with the aspect ratio between the long central axis and the short central axis. <IMAGE>