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Wide-aperture optical lens for laser

An optical lens, large aperture technology, applied in optics, optical components, instruments, etc., can solve problems such as difficulty in correcting asymmetric beams, and achieve uniform imaging.

Active Publication Date: 2010-02-03
HANS LASER TECH IND GRP CO LTD
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Problems solved by technology

From the analysis of aberration theory, the advantage of the "three elements" type is that it is easy to correct the aberration of the symmetrical structure of the diaphragm in the lens, but now the entrance pupil is outside the lens and is quite far away from the lens. It is difficult to correct the aberration of the asymmetric beam with the structure

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  • Wide-aperture optical lens for laser
  • Wide-aperture optical lens for laser
  • Wide-aperture optical lens for laser

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Embodiment Construction

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0024] The present invention applies a large-aperture fθ optical lens for laser application. The main advantage of the lens is that: compared with the general laser application fθ lens of the same focal length, the relative aperture and light diameter of the lens are higher than that of the common laser application fθ lens. 2-3 times larger, the diameter of the light can reach up to 30mm, which can ensure that the astigmatism and field curvature of the system are well corrected, and the imaging is uniform in the whole field of view. The laser with no vignetting should use large aperture fθ optics lens, which adds a lot of difficulty to the design. The present invention is exactly to solve this difficult problem.

[0025] In order to solve the above problems, we thought of adopting the "negative-positive-positive" focal power distribution pattern, but bec...

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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 four lenses which are afirst lens, a second lens, a third lens and a fourth lens and are sequentially distributed into a negative-positive-positive-positive separation focal power system, and the ratio of the focal power ofthe lenses to the focal power of the focal power system accords with the following requirements: -0.8<f1 / fw<-0.6, 4.0<f2 / fw<4.6, 0.8<f3 / fw<1.1 and 1.5<f4 / fw<1.8. Compared with a common f(theta) lensfor 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, andthe longest light pass diameter of the wide-aperture optical lens can reach 30 mm; and in addition, the wide-aperture optical lens can ensure that the astigmatism and the field curvature of the focalpower system are well rectified and achieve uniform imaging on a full view field without vignetting.

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" photo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B13/00
Inventor 高云峰周朝明李家英李红梅孙博张维臣
Owner HANS LASER TECH IND GRP CO LTD
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