由于光的衍射作用，使通过聚焦系统的激光束入射到特定靶面成一光斑（主光斑） ，而在主光斑以外还有次级光斑圈（旁瓣）。
The laser beam passing through the focusing systems gets an facula, which consists of main spot and sidelobe on the focus plane.
弥散圈的大小(直径)简单地决定于胶卷和该部分物体聚焦的地方有多远。
The size (diameter) of the circle of confusion depends simply upon how far the film is from where that particular detail of the image is focused.
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。
The focus servo system of the OM is analyzed and the mathematical model of the voice-coil motor is presented.
分析了DVD聚焦伺服系统中音圈电机和光头拾取器的数学模型，通过实验测定其模型参数，完成了DVD聚焦伺服系统的建模，并进行了仿真。
The model of voice coil motor and optical pickup unit are analyzed, the model parameters are tested, the model of DVD focus servo system is built and the simulation is carried out.
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。
This paper deals with the open system of numerical control based on Windows98, mainly discussing the interface module , the manage module and the servo module.
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。
This paper deals with the open system of numerical control based on Windows98, mainly discussing the interface module , the manage module and the servo module.
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