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How much do you know about light guides?

               
Date:2022-07-27 14:22:09 Wednesday
Summary:The so-called light guide is a structural member that guides the light emitted by the LED from the PCB to the front panel or the sending position. This structural member is generally made of PC material or PMMA material, which has good light guiding ......
The so-called light guide is a structural member that guides the light emitted by the LED from the PCB to the front panel or the sending position. This structural member is generally made of PC material or PMMA material, which has good light guiding performance. Light guides are also called light guide tubes or light guide columns in the mouths of some domestic engineers. Some small manufacturers also use ordinary plastics to make light guides for the needs of low-end customers.

Light guides are called light guide tubes or light guide columns in the mouths of some domestic engineers. There are several important parameters to measure their quality:

1. Light guide, that is, light guide rate, the best light guide manufacturers in the world can achieve 92%
2. Heat resistance, that is, high temperature resistance, the best light guide manufacturers use special PC and PMMA materials, which can make the light guide last for 40 seconds in a 260-degree environment
3. Environmental standards must pass Rohs.

The transmission of light in an optical fiber is the same as that of water in a rubber tube. A beam of light is injected from one end of the optical fiber, and even if the optical fiber is bent, the light will follow the pipe and exit from the other end.
It is generally believed that light seems to travel in a straight line, how can it bend flexibly here? Reflection and refraction of light need to be discussed here. When light travels in a medium, it travels in a straight line; but at the interface of two mediums, such as when light travels from water to water, it reflects and refracts light.

As a result of reflection, the light changes direction and continues to travel in the water, and as a result of refraction, the light is deflected by a certain angle and enters the air. The distribution of light is related to the angle between the light and the water surface. The smaller the angle, the greater the proportion of reflected light. When the angle is less than a certain value, all the light will be left in the water and cannot enter the air. At this time, total reflection occurs. The phenomenon of total reflection only occurs when light passes from a material with a large refractive index to a material with a small refractive index.

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