Machine vision linear-array lens with large target surface and fixed focus

Abstract

The invention discloses a machine vision linear-array lens with large target surface and fixed focus. An optical system of the lens comprises a first lens having positive focal power and meniscus structure, a second lens having positive focal power and meniscus structure, a third lens having negative focal power and meniscus structure, a fourth lens having positive focal power and biconvex structure, a fifth lens having negative focal power biconcave structure, a sixth lens having negative focal power and biconcave structure and a seventh lens having positive focal power and biconvex structurefrom the object space to the image space in sequence. The focal length of the optical system is f', the semi-image height of the target surface of the optical system is y', and f' and y' meet the relation Iy' / f'l> / =0.45. By application of the lens, the main amplification factor is 0.10X and the available amplification factor ranges 0.04X-0.33X when the focal length is 29mm and the size of the corresponding chip is 30mm. Within the range of the available amplification factor, clear imaging can be achieved by changing the object distance of the lens and regulating the back intercept.

Description

technical field [0001] The invention relates to the technical field of machine vision lenses, in particular to a fixed-focus machine vision linear array lens with a large target surface. Background technique [0002] Machine vision is the use of machines instead of human eyes for measurement and judgment. The machine vision system refers to converting the captured target into an image signal through an image capture device (CMOS and CCD), and transmitting it to a dedicated image processing system, and converting it into a digital signal according to pixel distribution, brightness, color and other information; The system performs various calculations on these signals to extract the characteristics of the target, and then controls the on-site equipment actions according to the results of the discrimination. [0003] Image capture devices are divided into line array type and area array type according to chip type. In the field of high-precision measurement, line array cameras...

AI Technical Summary

Problems solved by technology

[0004] It is difficult for traditional fixed-focus machine vision line scan lenses to have good resolution and low distortion; at the same time, the large field of view design cannot effectively reduce the space required for installation, and the resolution of traditional lenses will change with the change of magnification. There is a big change, is there a relatively stable imaging performance within the available magnification?

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