High-image-quality and low-distortion machine vision ultraviolet lens

Abstract

The invention relates to a high-image-quality and low-distortion machine vision ultraviolet lens. The high-image-quality and low-distortion machine vision ultraviolet lens mainly comprises a front lens group, a rear lens group and a diaphragm, wherein each of the front lens group and the rear lens group has positive focal power; the diaphragm is positioned between the front lens group and the rear lens group; the front lens group is sequentially provided with a first lens, a second lens, a third lens and a fourth lens from an object space to an image space; the first lens, the second lens, the third lens and the fourth lens form a bonding lens; each of the first lens, the second lens and the third lens has negative focal power, and the four lens has the positive focal power; the rear lens group is sequentially provided with a fifth lens, a sixth lens, a seventh lens and an eighth lens from the object space to the image space; each of the fifth lens and the sixth lens has the positive focal power, and each of the seventh lens and the eighth lens has the negative focal power. With the eight spherical lenses, the high-image-quality and low-distortion machine vision ultraviolet lens has the characteristics of small F number, compact structure, low distortion, high resolution and the like, and is quite suitable for being integrated to a machine vision system.

Description

technical field [0001] The invention relates to the technical field of ultraviolet optical imaging, in particular to a high-quality, low-distortion machine vision ultraviolet lens. Background technique [0002] In recent years, with the development of machine vision technology, there are more and more occasions to use it, and the requirements for machine vision systems are also getting higher and higher. As an important part of the machine vision system, the optical lens directly affects the detection and judgment results of the system. It can be seen that the optical lens plays a decisive role in the entire machine vision system. [0003] However, the existing machine vision lenses are mainly concentrated in the visible light and infrared bands, and there are fewer products in the ultraviolet band. Compared with visible light and infrared bands, ultraviolet bands have shorter wavelengths and are more likely to hit atoms and molecules. Therefore, compared with ordinary lens...

AI Technical Summary

Problems solved by technology

However, due to the lack of optional materials in the ultraviolet band, it is difficult to correct the chromatic aberration of the ultraviolet lens, and the imaging quality is not easy to improve. Therefore, many ultraviolet lenses achieve high spatial resolution by increasing the system F number, but increasing the system F number at the same time It will also reduce the amount of light entering the system and affect the illumination of the image plane. Therefore, how to achieve high imaging quality at the same time with a small F number is a difficult problem that the current UV lens needs to continue to break through.

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