11 industrial camera lens parameters

The vision of industrial cameras adds a new dimension to industrial control systems that can provide the size, position, and orientation of parts on an assembly line. Therefore, the camera lens is very important, then we should know these parameters, the following is based on my experience summary:

1. Focal Length Focal length is the distance from the center of the lens to the clear image formed on the glue plane. The size of the focal length determines the size of the viewing angle, the focal length is small, the viewing angle is large, and the observed range is also large; the focal length has a large value, the viewing angle is small, and the observation range is small. According to the focus can be adjusted, can be divided into fixed focus lens and zoom lens two categories.

2. The iris (Iris) is represented by F and is measured by the ratio of the lens focal length f and the clear aperture D. Each lens is marked with a maximum F value, for example, 8mm/F1.4 represents a maximum aperture of 5.7mm. The smaller the F value, the larger the aperture, the larger the F value, and the smaller the aperture.
3. For the maximum CCD size (Sensor Size) The maximum CCD chip size that can be covered by the lens imaging diameter. There are mainly 1/2", 2/3", 1" and 1" or more.
4. Mount Lens and camera connection. Commonly used include C, CS, F, V, T2, Leica, M42x1, M75x0.75 and so on.
5. Depth of Field (DOF) Depth of field refers to the extent to which the image is still clear within a certain distance before and after the object after the subject is focused. The depth of field changes with the lens' 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 the distance to the subject, the smaller the depth of field; the further away from the subject, the greater the depth of field.
6. Resolution The resolution represents the ability of the camera to record the details of the object. The unit of measurement is the number of black and white lines per millimeter that can be distinguished: "line pair/mm" (lp/mm). The higher the resolution, the sharper the lens is.
7. Working distance (WD) The distance from the first working surface of the lens to the measured object.
8. Field of View (FOV) The size of the area the camera actually captured.
9, optical magnification (Magnification, ß) CCD / FOV, the chip size divided by the field of view.
10. Numerical aperture (NA) The numerical aperture is equal to the product of the refractive index of the medium between the object and the objective lens, n, and the sine of the objective lens's aperture angle (a\2). The formula is NA=n*sin a/. 2. The numerical aperture is closely related to other optical parameters. It is proportional to the resolution and proportional to the magnification. In other words, the numerical aperture directly determines the resolution of the lens. The larger the numerical aperture, the higher the resolution. Otherwise, the opposite is true.
11, Flange distance (Flange distance) Accurately speaking, after the multiple focus is a camera parameter, refers to the camera interface plane to the chip distance. However, when the lens selection of an online scanning lens or a large area camera, the rear focus is a

Very important parameter because it directly affects the configuration of the lens. Cameras from different manufacturers, even if the interface is the same, may have different post-focus.

Seen above, the parameters of the industrial camera lens should be better understood, so how to choose a good camera for everyone to choose an industrial camera.