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Optical lenses should be very familiar to those in the machine vision industry, as lenses are an essential part of machine vision inspection systems. For the principle of the lens, we should also have some understanding, in some of our lens may also exist some observed image deformity problem. Let's get to know about it.

In the machine vision system, the optical lens is equivalent to the human eye, and its main function is to focus the optical image of the target on the photosensitive area array of the image sensor (camera). All image information processed by the vision system is obtained through the lens, and the quality of the lens directly affects the overall performance of the vision system. Once there is a serious loss of information in the imaging system, it is very difficult to try to recover it later. Selecting industrial lens and designing imaging optical path is one of the key technologies of vision system.

There are many kinds of optical lenses. From the focal length, they can be divided into short focal length, medium focal length, long focal length and zoom lens. From the size of field of view, they can be divided into wide-angle, standard and telephoto lenses. From the structural classification, they can also be divided into fixed aperture fixed focus lens, manual aperture fixed focus lens and automatic aperture fixed focus lens, manual zoom lens, automatic aperture electric zoom lens, electric three variable lens (aperture, focal length, focus of the three can be) and other types.

Optical lens imaging more or less there will be distortion. Large distortion will bring great trouble to the vision system, which should be considered in detail in the imaging design, including the selection of small distortion lens, effective field of view only take the center field of view with small distortion, etc. Another characteristic of the lens is its spectral characteristics, which are mainly affected by the interference characteristics of the lens coating and the absorption characteristics of the material. It is required that the light with the highest resolution of the lens should match the wavelength of the lens and the wavelength of the CCD device, and the light transmittance of the optical lens to this wavelength should be improved as much as possible. Some special effects can be achieved by selecting appropriate filters in the imaging system. In addition, the design of the imaging optical path also needs to pay attention to the influence of various stray light.

The lens is also an essential part of TV monitoring. With the cooperation of the lens and the CCD industrial camera, the remote target can be imaged on the CCD target surface of the industrial camera, and then the optical image formed by the optical imaging system can be converted into video/digital signal.

The high-end quality machine vision lens of Dongzheng Optics adopts ultra-low distortion design, low distortion rate, and various optical correction methods to minimize the occurrence of aberrations, so that it can maintain a high MTF value at the frequency band with high spatial frequency, high contrast definition, solid mechanical design of the lens, and the locking device after adjustment, it is very suitable for factory automation, machine vision, intelligent detection, image processing and other occasions with very high image quality requirements. It can be used with various industrial cameras. It is widely used in medical industry, printing detection, LCD screen detection, glass detection, solar energy detection, lithium battery detection, circuit board detection and many other fields, high-precision measurement, detection, identification and other industrial machine vision and image processing systems.