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地磁和外界各种杂散磁场对彩色电视机显象管内荫罩、栅网、防爆环、外屏蔽罩和其它金属材料的固定件极容易引起磁化作用.设想彩色电视机在水平方向作东南西北运动,由阴极发射的电子束受到均匀地磁的作用,使其到达屏幕的途径变成弯弯曲曲,这种现象在显象管屏幕表面任何位置上都是不相同的.图1所示为地磁对显象管屏幕上有关各点的影响情况,此时电子束的轨迹呈椭圆形,而且各棱角处电子束的偏差还要更大一些.
Geomagnetic and various external stray magnetic field on the color TV picture tube shadow mask, grid, explosion-proof ring, the outer shield and other metal materials fixed very easy to cause magnetization.Isvision color TV in the horizontal direction for southeast northwest Movement, the electron beam emitted by the cathode by the uniform magnetic effect, so that the way to reach the screen into a winding, this phenomenon in the tube screen surface at any location are different. On the CRT screen on the impact of the various points, the trajectory of the electron beam was oval, and the angular deviation of the electron beam even greater.