Wide-aperture optical lens for laser

Abstract

The invention relates to a wide-aperture optical lens for laser, comprising a lens group and a diaphragm positioned in front of the lens group, wherein the lens group includes three lenses which are a first lens, a second lens and a third lens and are sequentially distributed into a negative-positive-positive separation focal power system, wherein the first lens is a negative lens in a curved moon shape, and the curved surface of the first lens is curved towards the direction of the diaphragm; the second lens and the third lens are both positive lenses in the curved moon shape, and the curvedsurfaces of the second lens and the third lens are also curved towards the direction of the diaphragm; and the ratio of the focal power of the lenses to the focal power of the focal power system accords with the following requirements: -0.5<f1 / fw<-0.4, 0.55<f2 / fw<0.65 and 0.8<f3 / fw<1. Compared with a common f(theta) lens for the laser with same focal length, the relative aperture and the light pass diameter of the wide-aperture optical lens are 2-3 times longer than those of the common f(theta) lens for the laser, and the longest light pass diameter of the wide-aperture optical lens can reach30 mm; and in addition, the wide-aperture optical lens has large required view field and long focal length.

Description

【Technical field】 [0001] The invention relates to an F-theta optical lens with a large aperture for laser application. 【Background technique】 [0002] At present, the application of laser welding has penetrated into every aspect of our modern life. Such as electronic components, hardware products, precision machinery, auto parts, craft gifts and other industries. In the laser welding machine equipped with a vibrating mirror table, various application optical systems to meet various process requirements are inseparable. This type of laser welding has the advantages of fast welding speed, small solder joints, small deformation, smooth and beautiful weld seams, and can realize welding between certain dissimilar materials. [0003] The fθ (F-theta) lens is a photographic objective lens with a large field of view, medium and small apertures, and a medium-long focal length. In terms of the parameters it has to bear, it should be more appropriate to choose a "three-element" phot...

AI Technical Summary

Problems solved by technology

At present, this kind of large-aperture optical lens developed by us is still the original creation in China. Although there are such lenses abroad, they are only individual lenses and not a series; and they are large in size and expensive.

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