Large-aperture low-distortion fixed-focal-line scanning machine vision lens

Abstract

The invention relates to the technical field of visual lenses, in particular to a large-aperture low-distortion fixed-focal-line scanning machine vision lens. The large-aperture low-distortion fixed-focal-line scanning machine vision lens sequentially comprises a first lens having the positive focal power and a meniscus structure, a second lens having the positive focal power and a meniscus structure, a third lens having the positive focal power and a meniscus structure, a fourth lens having a negative focal power and a meniscus structure, a fifth lens having a negative focal power and a meniscus structure, a sixth lens having the positive focal power and a meniscus structure, a seventh lens having the positive focal power and a meniscus structure, an eighth lens having the positive focalpower and a meniscus structure and a diaphragm located between the fourth lens and the fifth lens from the object surface side to the image surface side; the third lens and the fourth lens are glued to form a first lens group having the negative focal power, and the focal length is fU1; the fifth lens and the sixth lens are glued to form a second gluing lens group having the negative focal power,the focal length is fU2, and the following relationships that 0.35<|fU1 / f|<0.7, and 0.35<|fU2 / f|<0.7 are achieved. The large-aperture low-distortion fixed-focal-line scanning machine vision lens can meet the application requirements of large aperture, low distortion and the short working distance, and the clear aperture of the large-aperture low-distortion fixed-focal-line scanning machine visionlens can be flexibly adjusted.

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. In many industries such as electronics manufacturing, liquid crystal screen defect detection, touch screen size measurement, and food packaging, the requirements for optical distortion of the core component line scan machine vision lens in the inspection equipment are getting higher and higher. Higher: In order to miniaturize the inspection equipment, the working distance of the line scan machine vision lens is required to be short; and...

AI Technical Summary

Problems solved by technology

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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