Cathode-ray tube

本发明提供防止局部隆起现象和初期隆起现象造成的色电子束的误着屏、防止色偏差、色不匀及亮度下降的阴极射线管。配有在平板上排列开孔(2)的多个列的荫罩，在相邻的开孔(2)的列之间，在开孔(2)的列方向上形成缝隙(5、6)，该缝隙(5、6)具有通过间隙(10、13)对置的倾斜面(8、9、11、12)。由此，可以抑制荫罩热膨胀情况下的局部隆起现象或初期隆起现象造成的开孔的位移，可以防止电子束的误着屏引起的色偏差、色不匀以及亮度下降。 A cathode ray tube capable of preventing incorrect hitting of color electron beams caused by the local doming phenomenon and the initial doming phenomenon from occurring and thus preventing displacement of colors, unevenness in colors, and deterioration of luminance from occurring is provided. The cathode ray tube includes a shadow mask made of a flat plate in which a number of apertures 2 are arranged in lines, and slits 5, 6 are formed in the line direction of the apertures 2. These slits 5, 6 have inclined faces 8, 9, 11 and 12 opposed via openings 10, 13. Due to this configuration, the displacement of apertures due to the local doming phenomenon or the initial doming phenomenon caused by the thermal expansion of the shadow mask can be suppressed. Thus, displacement of colors, unevenness in colors, and deterioration of luminance caused by incorrect hitting of electron beams can be prevented from occurring.