Small depth of field telecentric optical lens with variable working distance

Abstract

The invention belongs to the technical field of optical lenses, in particular to a small depth-of-field telecentric optical lens with variable working distance. The small depth-of-field telecentric optical lens with variable working distance provided by the present invention sequentially includes an object-side fixed lens group, an object-side moving lens group, an aperture stop, and an image-side fixed lens group along the optical axis from the object side to the image side. When the working distance changes, it is only necessary to adjust the moving lens group on the object side for image plane compensation and aberration balance. The operation is simple, the detection efficiency is high, and it has a very small depth of field, which can ensure that the machine vision measurement system can obtain the connector Pin stably and efficiently. Needle position accuracy; good imaging performance, can support 5 million pixel level 1in high-resolution industrial camera; its telecentricity is small, distortion is less than or equal to 0.5%, image distortion is greatly reduced, and detection accuracy is further improved, which can be fully applied to future in the field of machine vision.

Description

technical field [0001] The invention belongs to the technical field of optical lenses, in particular to a small depth-of-field telecentric optical lens with variable working distance. Background technique [0002] Machine vision is the use of machines instead of human eyes for measurement and judgment. Compared with the human eye, machine vision has stronger adaptability and higher stability, and can well make up for the shortcomings of the human eye in terms of resolution, light sensitivity range, and response speed. The key technologies of machine vision mainly involve light source lighting, optical lenses, image signal processing and actuators, etc. Among them, optical lenses, as the core components of machine vision systems, play the role of eyes, and their imaging quality is very important. [0003] With the wide application of machine vision systems in the field of precision inspection, it is difficult for ordinary optical lenses to meet the inspection requirements. ...

AI Technical Summary

Problems solved by technology

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the defect that the existing telecentric lens is difficult to obtain the position of the Pin needle stably and efficiently due to the incompatibility of the depth of field, thereby proposing a variable working lens with high measurement accuracy and good imaging quality. Telecentric lens with small depth of field

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