CRT管聚焦性能
CRT投影机把输入的源信号分解到R（红）、G（绿）、B（蓝）三个CRT管的荧光屏上，在高压作用下发光，经过信号放大和会聚，在大屏幕上显示出彩色图像。CRT管的聚焦分为静电聚焦、磁聚焦和电磁复合聚焦三种，电磁复合聚焦应用较为普遍，它的优点是聚焦性能好、聚焦精度高，可以进行分区聚焦和边角聚焦，让投影画面清晰。
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