Small-depth-of-field high-resolution double-telecentric optical lens

Abstract

The invention belongs to the technical field of optical lenses, and particularly relates to a small-depth-of-field high-resolution double-telecentric optical lens. The small-depth-of-field high-resolution double-telecentric optical lens provided by the invention sequentially comprises a biconvex positive lens L1, a meniscus positive lens L2, a meniscus positive lens L3, a meniscus negative lens L4, an aperture diaphragm, a meniscus negative lens L5, a biconvex positive lens L6, a biconvex positive lens L7 and a meniscus negative lens L8 in the optical axis direction from the object side to theimage side. The optical lens is simple in structure, low in cost and good in machining performance; the depth of field is extremely small, and it can be guaranteed that a machine vision measurement system can stably and efficiently obtain the position degree of a connector Pin; the imaging performance is good, and a 20 million-pixel-level 1in high-resolution industrial camera can be supported; and the telecentric degree is small, the maximum distortion is smaller than 0.1%, the image distortion degree is greatly reduced, the detection precision is further improved, and the optical lens can beapplied to the field of future machine vision.

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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