High-magnification wide-working-distance line scanning lens

Abstract

The invention belongs to the technical field of lenses. The invention particularly relates to a high-magnification wide-working-distance linear scanning lens. The lens comprises a mechanical system and an optical system installed in the mechanical system, the optical system is sequentially provided with a first lens group S1, a diaphragm (1) and a second lens group S2 from an object side to an image side, and when the working distance is changed, the first lens group S1, the diaphragm (1) and the second lens group S2 are focused in a front-back moving mode. According to the invention, the linescanning industrial lens with high magnification and wide working distance is realized; the focal length is 116 mm, the magnification is 0.425 X to 0.575 X, the applicable working distance is 286 mm-357 mm, the image space F number is 4.8, the maximum imaging surface is phi 82 mm, the resolution can reach 100 lp / mm, and the maximum optical distortion of the full field of view is lower than 0.035%.

Description

technical field [0001] The invention belongs to the technical field of industrial lenses, in particular to a line-scanning lens with high magnification and wide working distance. Background technique [0002] Driven by Industry 4.0, "automation" and "intelligence" have become the trend of modern industrial production. As an important part of "automation" and "intelligence", visual inspection system has been widely used in various industries. Therefore, the demand for industrial lens applications, which is the core of visual inspection system, is also increasing. In electronics manufacturing, liquid crystal screen defect detection, printing detection, non-woven fabric detection, mobile phone touch screen smooth surface scratches, crack detection and other applications, the detection accuracy requirements are getting higher and higher, and it is necessary to rely on line scanning industrial lens imaging, especially in some For online real-time detection items, the performance...

AI Technical Summary

Problems solved by technology

[0003] However, the optical performance of the existing domestic line-scan industrial lenses always has shortcomings: large optical distortion, narrow working distance range, etc., so the research and development of line-scan industrial lenses with higher optical performance is more urgent

[0004] At present, the machine vision lenses on the market, such as the patent No. "201710525728.X", the working distance of this lens supports 0.2m to infinity, but it cannot meet the demand for a closer working distance; another example is the patent No. "201621096764.6 "Patent, the working distance of the lens is 100mm-600mm, but the working distance range is too narrow; another example is the patent number "201721433005.9", the working distance of the lens is 50mm-160mm, but its optical distortion is 0.05 %, higher degree of distortion

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