首先，学习显微镜如何调焦。

First, learn how to focus the microscope.

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介绍了一个基于图像处理的自动调焦系统，该系统由光学显微镜、CCD、力矩电机和齿轮传动机构等组成。

Based on the image processing technology, an auto-focusing system consisted of optical microscope, CCD, moment motor and drive gear etc, was presented.

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文中介绍了自动调焦装置的工作原理，并给出了技术指标，这种装置能解决中倍数生物显微镜的自动调焦问题。

The working principle is explained and technical performances are also given. This device is especially useful for microscopes with midmagnifying power.

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