电视摄像机电视发射装置的一部分，其在光敏阴极管上接受原始图象，并将之转化为。
The part of a television transmitting apparatus that receives the primary image on a light-sensitive cathode tube and transforms it into electrical impulses.
光电倍增管有一个对光敏感的阴极，它发射的电子数目与撞击到其上面的光子数量成正比。
The tube consists of a light-sensitive cathode that emits electrons in proportion to the photons striking it.
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