Optical system provided with machine-vision camera lenses with large target areas

Abstract

The invention discloses an optical system provided with machine-vision camera lenses with large target areas. The optical system comprises a first lens G1 with positive focal power and a crescent structure, a second lens G2 with positive focal power and a crescent structure, a third lens G3 with negative focal power and a crescent structure, a fourth lens G4 with positive focal power and a double-convex structure, a fifth lens G5 with negative focal power and a crescent structure, a sixth lens G6 with negative focal power and a double-concave structure and a seventh lens G7 with positive focalpower and a double-convex structure from object spaces to image spaces. A relational expression of 0.8 |f1/f| 1.2 is met by the focal distance f of the optical system and the focal distance f1 of thefirst lens G1, and a relational expression of 2y/f 0.85 is met by a target area 2y of the optical system and the focal distance f. The optical system has the advantages that the optical system can bematched with linear-array cameras with the resolution higher than 8 k and the pixel sizes of 7 micrometers, and accordingly high-quality imaging with the wide working distances of 0.04X-0.33X can beimplemented.

Description

technical field [0001] The invention relates to the technical field of lenses, in particular to an optical system of a machine vision 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 ingested target into an image signal through an image sensing 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; image The system performs various calculations on these signals to extract the characteristics of the target, and then controls the on-site equipment according to the results of the discrimination. [0003] In the context of industrial automation, the demand for machine vision is increasing day by day. In the field of high-precision measurement, line array cameras are usually used, such...

AI Technical Summary

Problems solved by technology

Correspondingly, the array camera needs to be equipped with a line-scan fixed-focus machine vision lens. However, the existing domestic line-scan lenses generally have defects such as a small range of applicable working distance, and changes in the working distance will reduce the image quality. Dedicated, with the lens as the center to choose to match the applicable working conditions, which greatly limits the application occasions

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