What are the differences between machine vision positioning inspection industrial lens and civilian lens

The lens is an important component in the machine vision system and has a key role in imaging quality. It has an impact on several of the most important indicators of imaging quality, including: resolution, contrast, depth of field and various aberrations. Compared with ordinary lenses, there are more types of industrial lenses and a wider range of applications. Let's understand the difference between industrial lenses and ordinary civilian lenses. 1. Different clarity The resolution of the industrial lens is the highest in the center of the imaging surface, and the difference in the edge. Ordinary lenses can basically meet the sharpness of the center resolution, while the sharpness of the edges is reduced a lot. For example, the edge resolution of the SLR is relatively low. There are three key factors that determine the sharpness of the lens: 1. Lens material and purity. The less impurities in the lens, the less interference light it produces, and the clearer the picture 2. The grinding precision of the lens. The grinding accuracy of the lens is determined by the grinding equipment. At present, the difference between domestic lenses and foreign lenses is concentrated on this point. 3. The coating precision of the lens. The precise control of the coating process is also one of the determinants of lens clarity. In addition, the megapixel lens used in industrial production adopts aspherical lenses, which can reduce aberrations. Compared with ordinary lenses, it improves the definition while achieving a miniaturized design. Through special optical design technology, the center of the image to the peripheral part of the The image quality achieves a high-resolution, high-contrast picture, which is about 2.5 times higher than that of a traditional lens. Even when the image is cut or zoomed in, the high image quality can still be guaranteed. Second, the spectral transmission ability is different The spectral transmittance of the lens also contributes to the improvement of picture clarity. The transmission of wide-frequency light will greatly increase the amount of light received by the camera's target surface. It can enhance the contrast and brightness of the picture, and the details of the picture are more abundant. The edge brightness of the ordinary lens is low. Three. The distortion rate is different The distortion that the human eye can distinguish is greater than 3%, so the distortion of an ordinary lens is generally designed to be between 2% and 3%. But it is often not enough for industrial lenses. Long-travel lenses for industrial production can achieve ultra-low distortion and set zero distortion, which is very important for some inspections that require high-precision operations. Industrial lenses can better meet the requirements of industrial production environments.