Free-form curved lens being capable of acquiring adjustable double focuses

Abstract

The invention discloses a free-form curved lens being capable of acquiring adjustable double focuses. The curved lens is a cylindrical lens and has a structure designed creatively. On the basis of characteristics of an infinite focal length optical lens and the light split characteristics under r different parameter segmentation of a single mirror, the free-form curved lens rotates in a segmentation line direction and moves in a directionperpendicular to the beam transmission axis and the segmentation line and high adjustability of the single focus and double focuses, the double focus distance, and the double focus energy ratio of the focused light spots is realized by cooperating with the focusing lens. The free-form curved lens is especially suitable for the laser welding application; the overlap width and clamping requirements of plates are reduced; and various defects in welding of high-reflection materials are overcome. The free-form curved lens is suitable for welding of different materials and unequal-thickness materials; and the the quality of weld formation is improved.

Description

technical field [0001] The invention relates to the technical field of laser welding, in particular to a free-form surface lens for obtaining adjustable bifocals. Background technique [0002] Laser processing technology covers various laser processing technologies such as laser cutting, welding, quenching, drilling, micromachining, etc., and utilizes the basic characteristics of the interaction between laser and matter. Because the laser beam has the advantages of non-contact with the processing material, fast processing speed and excellent quality, it has established that the laser processing technology is an irreplaceable high-tech. [0003] Laser welding has the advantages of high energy density, fast speed, small welding deformation, narrow melting width and heat-affected zone. However, for laser welding of high-reflection materials, ordinary welding methods are not enough to meet the welding requirements, such as laser welding of aluminum alloys, which are prone to la...

AI Technical Summary

Problems solved by technology

The beam-splitting prism is used to split the light, and the focal distance of the single lens cannot be adjusted. When the double lens achieves single focus, the out-of-focus beam segments do not overlap, resulting in a larger divergence angle. When achieving double focus, the shape of the out-of-focus spot is asymmetrically distributed. Bifocal adjustment cannot be achieved; free-form surface lens group to achieve bifocal, requires the combination of two lenses and coordinated movement to achieve bifocal and energy ratio adjustment, and will affect the focus spot size to a certain extent; half spherical lens cannot withstand high power applications, and Similar to the double-piece beam splitter, the shape of the out-of-focus spot under the double focus is asymmetrically distributed, which is not conducive to laser welding

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