荫罩管最明显的缺点是约有5/6的电子束能量被罩板吸收,甚至阴模荫罩管,不能激发萤光粉的束电子部分也是这个数量级,因为增加的罩板传输仅使束电子撞击在屏的黑色部分。在理论上讲,补救荫罩管这种缺点的最简单办法,是采用增加罩板孔的尺寸,使每一小孔处形成一电子透镜,把偏转平面的电 The most obvious drawback of the shadow mask tube is that about 5/6 of the electron beam energy is absorbed by the mask plate and even the shadow mask tube can not excite the beam electron portion of the phosphor powder is of this order of magnitude as the increased mask transfer only causes the beam The electrons hit the black part of the screen. In theory, the easiest way to remedy this shortcoming of shadow mask tubes is to increase the size of the mask holes so that an electron lens is formed in each of the holes,