The invention provides a method with a concave lens focus as a welding heat source and a welding device thereof.

本发明提供一种以凸透镜焦点为焊接热源的方法及其焊接装置。

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A new method of measuring the lens focus is presented, which is based onthe principle of transformation of the Gauss laser beam.

根据透镜对高斯激光束束宽的变换原理，提出了一种由变换前后发散角的变化确定透镜焦距的新方法。

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The method to measure the lens focus with laser speckle is described. The principle of this method is analysed and verified by experiment.

本文描述了利用激光散斑测量透镜焦距的方法，并对该方法进行了原理分析和实验验证。

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Most imaging systems, such as those found in digital cameras, use a lens to focus a scene on a sensor studded with millions of tiny sensors.

BBC: Lens-less camera emerges from metamaterials work

Because many Blu-ray movies come in a 2.35:1 aspect ratio, which is wider than the projector's 16:9 aspect ratio, Panasonic's Intelligent Lens Memory automatically detects and switches the lens and focus position.

ENGADGET: Panasonic PT-AE8000U projector touts brighter, smoother 3D for king-of-the-hill home theaters

The BCL-15 f8.0 Body Cap Lens serves as a body cap when carrying the camera around without its interchangeable lens, and transforms to become a pan-focus snapshot lens to capture images.

ENGADGET: Olympus E-PL5 and E-PM2: Micro Four Thirds cameras with OM-D-like focusing, performance boosts (hands-on)