INNER MAGNETIC SHIELD AND CATHODE-RAY TUBE

摘要

An inner magnetic shield includes a pair of opposing long side walls (1), a pair of opposing short side walls (2), and, in the center, an opening (3) surrounded by the two pairs. The short side walls (2) have a generally home-plate shaped cut (4) which reduces electron beam mislandings all over the screen. At the same time mislandings caused by the geomagnetism along the tube axis and those caused by that in the horizontal direction perpendicular to the tube axis can be balanced easily. As a result, the cathode-ray tube can display video free of color misregistration and uneven color.