How much do you know about infrared IR lenses?

For megapixel high-definition surveillance cameras, you will choose high-definition lenses, so do you know that among many high-definition lenses, they can also be divided into ordinary lenses and IR lenses according to their functions? If you do not pay attention to the effect of night vision surveillance, then the IR lens is very important to you. It is an ordinary lens. If you have additional needs for night vision, then you must not miss the IR lens.  Why are IR lenses present? What are the defects of ordinary surveillance cameras? What is the purpose of IR cameras to compensate? What are the effects of surveillance cameras on image quality? A series of questions are waiting for us to find answers. Ordinary monitoring lenses use infrared light at night, the focus position will change, and the image will become blurred, while the focus of infrared light and visible light of IR lens will remain different, so the image will be clearer. Since the light in the daytime and the light at night have different light wave lengths, the refraction will also form a deflection after passing through the lens, and this deflection is chromatic aberration, which is also an important reason for the decrease in the clarity of the lens and the unrealistic focus. When the functions of surveillance cameras are subdivided, infrared cameras and low-light cameras appear one after another, which also makes people pay more and more attention to night vision surveillance. IR is the abbreviation of infrared, so the IR lens is also a "artifact" specially created for night vision monitoring. Perhaps the cost of a surveillance lens is not high, but the IR lens can bring less investment to the user. The method of correcting the night vision image is not only one kind of IR lens, ordinary lens + IR-CUT is also a kind of processing plan, but the more parts it brings, the more difficult it will be for post-maintenance. I am looking for trouble. Perhaps the IR infrared lens has also encountered the difficulty of developing IP surveillance cameras. From the perspective of a single cost investment, the price of an infrared corresponding lens is 2/3 higher than the price of an ordinary lens, so that users and engineering companies have certain scruples when purchasing. . But from a long-term perspective, this one-shot configuration can indeed bring greater benefits than money. Multifaceted IR Lenses The IR lens solves the problem of focal plane shift, and which technology does it integrate? For example, the latest optical design and special optical glass materials (LD optical glass) can be used to eliminate the focal plane of visible light and near-infrared light. offset; or use a special ED lens to deal with the "running focus" problem of ordinary motorized zoom lenses under infrared light conditions. These lenses can only be affirmed after they are implemented and applied. So what principle is the manufacturer based on? This may require data to clarify the problem. Ordinary CCTV lenses only perform chromatic aberration correction for light in the 350-700nm band during optical design, and infrared light higher than 700nm is not considered, which forms the focusing surface of visible light and near-infrared light (700nm-950nm). leave. If it is used with an ordinary lens, the image will be blurred in the infrared region at night (700nm-950nm), and it needs to be re-focused. According to this problem, through the special coating design and the use of special optical materials, the light in the 350-950nm band can be well corrected for chromatic aberration, and the IR infrared corresponding technology is also produced accordingly. coke. Therefore, the monitoring system can obtain a clear image with the aid of the infrared light source. IR infrared lens technology is not a problem, but the price may affect its development. What is certain is that the infrared corresponding lens will still be a product with a large demand in the next few years. Once the output increases, the tightening of its cost will naturally affect the price reduction. IR lens will be the mainstream in the future. 2014 will be a year of comprehensive upgrade of security monitoring. By then, infrared night vision monitoring will no longer be a burden.