The scanning mechanical device, including a bracket and the rotation axis, driven by a stepper motor.
扫描机械装置包括支架和旋转轴，由一个步进电机驱动。
Paul Nipkow obtains a patent in Germany for TV, using a selenium cell and a mechanical scanning disk.
保罗·尼普可夫获得德国电视发明专利。他在电视技术中采用硒光电管和机械扫描盘。
The conventional mechanical scanning radar is gradually replaced by powerful electric scanning phased array radar in the application as an airborne radar due to its limited scanning speed.
传统的机械扫描雷达由于受其扫描速度的限制，在机载雷达的应用中已逐步被功能强大的电扫描相控阵雷达所取代。
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