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What kind of optical lens is good Apr 11, 2018

optical lens?

Coated lens?

HD lens?

Perhaps some of my colleagues’ friends have been working in the lighting industry for many years. It is still not clear how this optical lens is going, how it works, and why.

In fact, as long as you are a junior high school student, you can easily understand the principle of this lens.

First, optical lenses fall into two main categories: convex lenses and concave lenses. The role of the convex lens is to converge the balanced light into a point, which in turn can be emitted from the point light source.


The light is converted into balanced light by refraction; the concave lens has a divergent effect on the light, and it can disperse the balance light through the refraction to fan out the light. Beam light is through


Combinations of concave and convex lenses, changes in the distance between the object distance and the image distance to achieve zoom and focus functions.

What about coating lenses? The knowledge involved here is more profound. First of all, we have to figure out what kind of film is plated? What is the use?


This is the key. First, light is a signal fluctuation. The light that we usually talk about is just the light we see. In the narrow sense, it is rainbow, red, yellow, green, blue, and purple.


The seven colors are mixed at the same time, and what we see is white light. The light we can't see with the naked eye is infrared light and ultraviolet light, which is what we commonly call infrared and ultraviolet light. From


Essentially, optics, from red to purple, are light waves of wavelengths that our naked eye can discern, from red to violet wavelengths from 750 nm to 380 nm, and wavelengths greater than 750 nm red.


Both are called infrared light, and our collective name is ultraviolet light with a wavelength less than 380nm. Now back to the coating problem, the film, we also called the antireflection film, when the thickness of the antireflection film = wavelength / 4


Can increase the transmittance of incident light at this wavelength, while increasing the reflectivity of light at other wavelengths. For our lighting industry, what we need is to turn brightly colored light.


The wave increases the transmission rate. As a result, the reflectivity of part of the light wave will increase, and the light wave with increased reflectivity will be the color of the lens we see with the naked eye. So when we look


When the lens is red, it means that the antireflection film on the lens reflects the red light and increases the transmittance from yellow light to purple light. Do the lighting of this industry


Friends will know that the red light has always been weak, especially the LED. If the lens still reflects the red light, can that red light be seen? So this anti-reflection film is not good


On the contrary, when the color of the lens we see is purple, the transmittance of the three primary colors of red, green and blue will increase. At this time, the antireflection film is the best. Then let's look at it again


The wavelength of red light is 750-620nm, and the wavelength of violet light is 380-450nm. We take the middle value and the red light is 680 violet 420nm. When the lens is anti-red, the thickness of the antireflection film is purple.


Optical wavelength / 4 = 105nm or so, when the anti-violet lens, the thickness of the antireflection film = red wavelength / 4 = 170nm or so, that is, when the thickness of the anti-reflection film reaches 170nm


The best results, the worst at 105, the thickness of the coating is different, the process is certainly not the same, the price will be different.

So, as soon as we look at the color of the lens, we can know whether the lens is good or bad. Of course, the light wave does not mean a period of time. It is continuous and gradual, so the lens is not


There will be only a single purple or its red, the purple will certainly have a blue, the red will definitely have a yellow, the yellow, green and blue in the middle will also be the same reason, this with the characteristics of light waves


turn off. I believe everyone will not be embarrassed after reading this article.