The focus servo system of the OM is analyzed and the mathematical model of the voice-coil motor is presented.

介绍了光电测微系统的基本原理及其构成，分析了该系统的关键环节即聚焦伺服系统，建立了音圈电机的数学模型。

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In DVD focus servo system, the skew of the disc induces periodic disturbance whose frequency is the same with the rotation frequency of the disc.

在DVD聚焦伺服系统中，光盘翘曲会导致产生与光盘转动频率相同的周期性扰动。

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We need to add the controller in order to enhance the control precision and response speed of DVD focus servo system, and then a new emendation arithmetic was put forward.

为了提高DVD聚焦伺服系统的控制精度和响应速度需要加入控制器，提出了一种新的校正算法。

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With Canon's Hybrid CMOS AF System and Movie Servo AF, the camera provides continuous AF for focus tracking of moving subjects by helping to reduce the camera's need to "hunt", resulting in a quick and smooth continuous AF.

ENGADGET: Canon unveils EOS T5i and Rebel SL1, the world's smallest DSLR (hands-on)