A large aperture and low distortion fixed focus line scan machine vision lens

Abstract

The invention relates to the technical field of visual lenses, in particular to a large-aperture low-distortion fixed-focus line-scanning machine vision lens, which includes eight lenses, and the eight lenses sequentially include: positive refractive power, meniscus A first lens with a structure; a second lens with a positive refractive power and a meniscus structure; and a diaphragm located between the fourth lens and the fifth lens, forming an optical system of a large aperture and low distortion fixed-focus line-scanning machine vision lens; The focal length f of the first cemented lens group U1 , the image square F number is 2.6, and the maximum imaging surface has a resolution of 100lp / mm, that is, when the corresponding maximum imaging chip, its pixels can reach 12K pixels, and the maximum optical distortion of the whole field of view is lower than 0.008%; The focusing method realizes clear focusing with a working distance of 150mm~180mm, which can meet the application requirements of large aperture, low distortion and short working distance, and its clear aperture can also be adjusted flexibly.

Description

technical field [0001] The invention relates to the technical field of visual lenses, in particular to a large-aperture low-distortion fixed-focus line-scanning machine vision lens. Background technique [0002] The function of the machine vision system is to use the machine to measure, judge and detect defects on the target parts, so as to reduce or eliminate the misjudgment during human operation, and improve the measurement accuracy and stability. In the wave of industrial automation, the demand for machine vision is increasing day by day, especially in many industries such as electronics manufacturing, liquid crystal screen defect detection, mobile phone touch screen line, size measurement, and food packaging. The requirements for optical distortion of the lens are getting higher and higher. In order to miniaturize the detection equipment, the working distance of the line scan machine vision lens is required to be short. In order to further improve the accuracy of the im...

AI Technical Summary

Problems solved by technology

[0003] However, the existing domestic line scan machine vision lenses generally have large optical distortion, large working distance, and small light transmission. Therefore, the research and development of large aperture and low distortion fixed focus line scan machine vision lenses is more urgent.

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