At present, the total reflection cup LED lens is a common lens in the application of LED lenses. There are many people who are still unfamiliar with its working principle. The following is a brief description of its working principle of light path.
Total reflection cup internal structure of the LED lens is actually done by two parts: LED front light is light to penetrate through the LED lens inside small diameter curved surface pieces; the side light is to collect light through the lens reflector to reflect the way beyond the spotlight. It is the focus of the design that how to make the two parts of the lens projected out of the light spot should overlap as much as a spot.
After the light penetrating surface moves outside, this part of the light condensing angle becomes smaller, then the LED in front of a part of light will go beyond the surface and surface to penetrate and then the diameter of reflection, if the reflector unchanged, there is a part of the light from beyond the reflecting surface is projected to run outside, this part of the popular light called miscellaneous or light. Through the surface coefficient, the distance between a and LED will be concentrating angle on the front of LED change; surface reflection coefficient and the diameter size (area) is focusing angle on the LED side of light and light utilization effect; therefore through focusing and reflection focusing is needed by the computer simulation design to complete.
When the diameter of the reflector to expand, equivalent to the reflecting surface area increases, although can improve the reflection efficiency of lens, but the LED lens volume increases, impact caused by large volume of materials, injection time, shrinkage rate increases, rising costs, center thickness increased, optical loss increase etc.. The total reflection mirror cup LED lens is more suitable for use in condenser design below 45 degrees, of course, can also change the lens based on surface such as cup lens: concave, matte surface, matrix surface and horizontal surface and so on, can be different according to the different effect of the lens surface spot such as diffuse spot, rectangular beam oval spot etc..

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