Optical lenses should be very familiar to people in the machine vision industry, because the lens is an indispensable part of the machine vision inspection system. For the principle of the lens, we should also have some understanding. In some of our lenses, there may also be some problems with the observed image distortion. Let's take a look together.
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 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 the information is severely lost in the imaging system, it is very difficult to try to recover it in the following links. Choosing an industrial lens and designing an imaging optical path are one of the key technologies of the vision system.
There are many types of optical lenses. From the focal length, they can be divided into short focal length, medium focal length, long focal length and zoom lens; according to the size of the field of view, they can be divided into wide-angle, standard, and telephoto lenses; from the structural classification, It can also be divided into fixed aperture fixed focus lens, manual aperture fixed focus lens, automatic aperture fixed focus lens, manual zoom lens, automatic aperture electric zoom lens, electric three-variable lens (aperture, focal length, focus are all three), etc. Types of.
Optical lens imaging will be more or less distorted. Larger distortion will cause great trouble to the vision system. Detailed consideration should be given to this during imaging design, including the selection of a lens with a small distortion, and the effective field of view is only the central field of view with a small distortion. Another characteristic of the lens is its spectral characteristic, which is mainly affected by the interference characteristic of the lens coating and the absorption characteristic of the material. It is required that the highest resolution light of the lens should match the wavelength of the CCD device and the wavelength of the CCD device, and the light transmittance of the optical lens of this wavelength should be increased 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 lights.
The lens is also an indispensable component in TV monitoring. The lens cooperates with the CCD industrial camera to image a long-distance target on the CCD target surface of the industrial camera, and then converts the optical image formed by the optical imaging system into video/digital Signal.
The high-end quality machine vision lens of Dongzheng Optics adopts ultra-low distortion design, low distortion rate, and a variety of optical correction methods to minimize the occurrence of aberrations, so that it can maintain a relatively high frequency in the frequency band with high spatial frequency. High MTF value, high contrast clarity, sturdy mechanical design of the lens, adjusted locking device, very suitable for factory automation, machine vision, intelligent detection, image processing and other occasions with very high image quality requirements, and can be matched with various industries Cameras are widely used in the medical industry, printing inspection, LCD screen inspection, glass inspection, solar energy inspection, lithium battery inspection, circuit board inspection and many other fields, high-precision measurement, inspection, identification and other industrial machine vision and image processing systems .
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