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日本东芝公司研制成一种用殷钢(Invarnickel steel)制造的彩色显象管荫罩,其热膨胀系数只是钢的10%。众所周知,荫罩是一块多孔片,它是安装在荧光屏的后面的,用以确保从三色电子枪发射出来的电子只能击中其对应的荧光物质上。因为荫罩
Toshiba Japan has developed a color cathode ray tube made of Invarickel steel with a coefficient of thermal expansion of only 10% of the steel. It is well-known that a shadow mask is a perforated sheet that is mounted behind the screen to ensure that the electrons emitted from the three-color electron gun strike only their corresponding fluorescent substance. Because of the shadow mask