Common parameter sharing of machine industrial lens

In the current hot machine vision inspection system, industrial lens is an indispensable and important component and plays an important role. So do you know the common parameters of industrial lenses? Today, Yamako will share the common parameters of industrial lenses with you in popular science. The common parameters of industrial lenses are as follows: 1. Field of view: or the angle of view, the range that the image acquisition device can cover, that is, the size of the object plane corresponding to the image on the target surface. 2. Working distance: generally refers to the distance from the front end of the lens to the object to be measured. The system generally cannot image clearly if it is less than the minimum working distance. 3. Aperture: Expressed by F, measured by the ratio of the focal length of the lens f to the clear aperture D. Each lens is marked with the maximum F value, for example, 8mm /F1.4 means that the maximum aperture is 5.7 mm. The smaller the F value, the larger the aperture, and the larger the F value, the smaller the aperture. 4. Relative aperture: refers to the ratio of the incident light aperture diameter (indicated by D) to the focal length (indicated by f) of the lens, namely D/f. 5. Maximum relative aperture: Generally marked on the lens, such as 1:1.2 or f/1.2. 6. Resolution: Resolution is an important parameter to evaluate the quality of the lens. It refers to the logarithm of black and white stripes that the lens can distinguish within a unit millimeter at the image plane. 7. Focal length: Focal length is also one of the important parameters of the lens. It refers to the distance from the principal point to the focal point, called the focal length of the optical system, which determines the ratio between the image and the actual object. In the case of a certain object distance, to obtain a large-scale image, a long focal length lens is required. 8. Depth of field: refers to the range where the image is still clear within a certain distance before and after the subject after the subject is clearly focused. The depth of field varies with the lens's aperture value, focal length, and shooting distance. The larger the aperture, the smaller the depth of field; the smaller the aperture, the greater the depth of field. The longer the focal length, the smaller the depth of field; the shorter the focal length, the greater the depth of field. The closer you are to the subject, the smaller the depth of field; the farther you are from the subject, the greater the depth of field. 9. Numerical aperture: The numerical aperture is equal to the product of the sine value of the refractive index n of the medium between the object and the objective lens and the half of the objective lens aperture angle (a2). The calculation formula is N.A=n*sin a/2. Numerical aperture has a close relationship with other optical parameters. It is proportional to resolution and proportional to magnification. That is to say, the numerical aperture directly determines the resolution of the lens. The larger the numerical aperture, the higher the resolution, otherwise the opposite is true. 10. Physical interface: The physical interface of the lens refers to the physical interface method of the connection between the lens and the camera. Commonly used interface forms of industrial lenses are: C-mount, CS-port, F-port, etc., among which C/CS is an international standard interface specially used in the industrial field. The choice of lens interface depends on the physical interface of the camera.