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荫罩式彩色显像管工作时,荫罩球面隆起会引起彩色失真,这是因为用来制作荫罩的传统材料的主要成分是热膨胀系数较高的纯铁.东芝公司已经研制出15英寸、21英寸和28英寸全方屏彩色显像管.这些管子使用膨胀系数低的铁镍合金(称为殷钢合金)制作的荫罩.殷钢荫罩彩色显像管具有极好的抗彩色失真性能(由球面隆起所引起),适于作中等容量的显示器件,如数字电视及双重用途的电视.
Shadow mask spherical bulges cause color distortion when working in shadow mask color screens because the main component of conventional materials used to make shadow masks is pure iron with a higher coefficient of thermal expansion. Toshiba has developed a 15-inch, 21-inch And 28-inch full-screen color picture tubes with shadow masks made of low-expansion iron-nickel alloy called Invar alloy.The Yin Gang shadow mask color picture tube has excellent anti-color distortion performance (caused by spherical bulge) , Suitable for medium-capacity display devices, such as digital television and dual-use television.