The optical lens of medical field mirror is generally called camera or photographic lens, and its function is optical imaging. Lens is an important component of machine vision system and plays a key role in imaging quality. It has an impact on several main indicators of imaging quality, including resolution, contrast, depth of field and various aberrations. There are not only many kinds of lenses, but also great differences in quality. There are two kinds of endoscope lenses, CMOS and CCD. The difference lies in:
1. The sensitivity of CMOS is much lower than that of CCD, so the imaging ability will be very different.
2. Size CMOS can expand the size, and its sensor can be very large, which is also the reason for low sensitivity.
3. Speed CMOS sensors are very fast, do not need complex processing, and images can be directly presented on the display.
When designing the system, some users often do not pay attention to the selection of lens, which leads to the failure of obtaining ideal images and even the failure of system development. Therefore, when choosing an endoscope, they must first know how to select the quality of camera lens, and first know how to select the quality of camera head. The lens of endoscope is equivalent to a substitute for human eyes, Where the human eye cannot observe, if there is no lens, the detected things are a mess and have no definition. Just like our domestic cameras and cameras, when the human eye cannot stretch and adjust normally to the appropriate position to see things, it is myopia or hyperopia. Everything in front is unclear, There is a similar phenomenon in the cooperation between the camera and the lens. When the image becomes unclear, you can adjust the rear focus of the camera, change the distance between the CCD chip and the lens reference plane (equivalent to adjusting the position of the human eye lens), and make the blurred image clear. A good camera will bring a lot of convenience to your work and provide more guaranteed data for the detection data.