有谁知道那种没有光电板的光电鼠标的原理

不久前听说有一种不要光电板的光电鼠标，本人孤陋寡闻，现在才看到它。一个透明的发红光的鼠标。因为是公家的东西，我不能拆开看，也不知道它的原理，望知道的高手赐教！

以前的“光电鼠标”依赖于光电板，主要是利用光电板上的横竖交错的网格来完成鼠标移动的；楼上所说的新型的“光电鼠标”主要是靠光的漫反射完成移动的，只要是凹凸不平的表面，包括衣服、桌面、纸张等等，都可以正常移动，但是如果你把鼠标放在玻璃、镜子之类的平面物品上，再看看效果，你就会明白其中的奥妙了。
    如果说对了，请给分，谢谢！

It appears that the venerable wheeled mouse is in danger of extinction. The now-preferred device for pointing and clicking is the optical mouse.

Developed by Agilent Technologies and introduced to the world in late 1999, the optical mouse actually uses a tiny camera to take 1,500 pictures every second. Able to work on almost any surface, the mouse has a small, red light-emitting diode (LED) that bounces light off that surface onto a complimentary metal-oxide semiconductor (CMOS) sensor. The CMOS sensor sends each image to a digital signal processor (DSP) for analysis. The DSP, operating at 18 MIPS (million instructions per second), is able to detect patterns in the images and see how those patterns have moved since the previous image. Based on the change in patterns over a sequence of images, the DSP determines how far the mouse has moved and sends the corresponding coordinates to the computer. The computer moves the cursor on the screen based on the coordinates received from the mouse. This happens hundreds of times each second, making the cursor appear to move very smoothly.

“用一个激光发射器，发出光信号，对鼠标的接触表面做出扫描，进行对比，这样就可以判断出鼠标的运动轨迹，再把信号传送给计算机。”――摘自工作新感受----罗技极光银雕使用手记（橄榄树硬件评测室：Charles ）

jiyingjie你答错了，不过没关系。我一开始也有你这个想法。只是我觉得像桌面这样的介质，它反射的明暗条纹绝对不可能是均匀的，然而鼠标移动起来非常成比例，这就使我很怀疑了，并且它只有一个LED，而普通光电鼠标却是两个LED。我也想过是CCD器件，加单片机，不过我满脑子只想是8051，速度是达不到的。而且成本太高，也被我否决了。
看来技术的发展真是太快了，别人发明的东西，我们还搞不懂原理。
哎！
谢谢Tornado和shyeagle！