Small depth of field high resolution bi-telecentric optical lens

Abstract

The invention belongs to the technical field of optical lenses, in particular to a double telecentric optical lens with small depth of field and high resolution. The small depth-of-field and high-resolution bi-telecentric optical lens provided by the present invention is a biconvex positive lens L in sequence from the object side to the image side along the optical axis direction 1 , Meniscus positive lens L 2 , Meniscus positive lens L 3 , meniscus negative lens L 4 , aperture stop, meniscus negative lens L 5 , biconvex positive lens L 6 , biconvex positive lens L 7 and meniscus negative lens L 8 , which has a simple structure, low cost, and good processing performance; it has a very small depth of field, which can ensure that the machine vision measurement system can obtain the position of the connector Pin stably and efficiently; the imaging performance is good, and it can support 20 million pixel level 1in High-resolution industrial camera; its telecentricity is small, the maximum distortion is less than 0.1%, the image distortion is greatly reduced, and the detection accuracy is further improved, which can be applied in the field of machine vision in the future.

Description

technical field [0001] The invention belongs to the technical field of optical lenses, in particular to a double telecentric optical lens with small depth of field and high resolution. 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 of the existing bi-telecentric lens that it is difficult to obtain the position of the Pin needle stably and efficiently due to the large depth of field, thereby proposing a small depth of field with good measurement accuracy and image quality Resolution Bi-Telecentric Lenses

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