Lens design of LED crystal lamp

Review: at present, the crystal light source to incandescent or halogen bulbs, which has the advantages of large luminous angle, but the crystal lamp usually requires 10-20 light source, or even more, large power consumption.

Crystal light source only to achieve a larger angle of light, in order to play around the crystal bright, showing a clear crystal optical effect, to achieve decorative effect. In practical use, the light emitting angle of 250 degrees or so can basically meet the requirements. Because LED has the advantages of high light efficiency, low loss, the manufacturers have launched LED light crystal light, but the light intensity is LED Lambert distribution, light angle of 110 DEG -130 DEG, to achieve more than 250 DEG angle of light, we must carry out two optical design.

At present, the vast majority of LED crystal lamp light-emitting angle is only 60 degrees -160 degrees. By using the two optical lens, with common LED, can achieve a 250 DEG angle of light, the design principle is as follows: the top of the lens for the design of a concave free-form surface reflector, the side of the outer contour is an arc of the exit surface, the incident surface of the bottom cone frustum cavity. Light from the LED light source, from the bottom of the lens cone frustum cavity incident, concave free surface part of the light incident on the top of the lens, the small light directly reflects the shot, most of the light is reflected to the outer contour of the side reflects the shot, the other part of the light directly by the side of the outer contour reflects the shot.

Lens design of LED crystal lamp

Cone frustum cavity top incident surface is a convex arc, the divergence from the incident surface; the side wall of the incident is from the bottom shrinkage rotation surface having a slope gradually, the divergence from the incident surface. Top free curved lens concave reflector, projections formed using Snell's law, from the bottom of the lens incident light total reflection occurs at the free surface, the small angle light reflected to the exit side of the lens, the lens increases the angle of light, can effectively avoid the mirror reflection loss compared with specular reflection. The outer side of the outer profile gradually shrinks inward from the bottom to the top, which can increase the exit angle of the side emitting light. The bottom of the lens is designed with spiral teeth, which can be connected with the radiating body closely.

At the same time, the lens and the body is screwed down, the plane can suppress the PCB plate end lens thread of the PCB plate and reduce the gap between the radiator and the thermal conductivity of silicone, eliminating the problem fixed PCB plate and the radiating body, at the same time reach optical requirements, reasonable design of connectivity and heat lamps. Using the principle of free surface design of a crystal light source lens, can make LED instead of incandescent lamps, halogen lamps and other traditional light source applied to crystal lamp, LED single lamp performance is stable, the system life and reliability is higher.