鼠标按其工作原理的不同分为机械鼠标和光电鼠标，机械鼠标主要由滚球、辊柱和光栅信号传感器组成。当你拖动鼠标时，带动滚球转动，滚球又带动辊柱转动，装在辊柱端部的光栅信号传感器采集光栅信号。传感器产生的光电脉冲信号反映出鼠标器在垂直和水平方向的位移变化，再通过电脑程序的处理和转换来控制屏幕上光标箭头的移动。
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