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Just as a double convex lens enlarges so a double concave lens reduces. 正象双凸透镜可以放大那样，双凹透镜也可以缩小。
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。 ip.com
Among the reshaping systems converting a Gaussian beam to a flattop beam, the system composed of a plane-concave and a plane-convex lens, is a relatively simple structure. 在将高斯光束整形为平顶光束的整形系统中，由两个非球面镜组成的系统是比较简单的结构形式，该系统由平凹镜和平凸镜组成。