Wide angle based indoor lighting lamp

Abstract

The present disclosure provides one embodiment of an illumination structure. The illumination structure includes a substrate. A light-emitting diode (LED) is disposed over the substrate. A first lens is disposed over the LED. A second lens is disposed over the first lens. The first lens and the second lens are configured to refract light that is emitted by the LED backward.

What is claimed is: 
     
         1 . An illumination structure, comprising:
 a substrate;   a light-emitting diode (LED) disposed over the substrate;   a first lens disposed over the LED; and   a second lens disposed over the first lens;   wherein the first lens and the second lens are configured to refract light that is emitted by the LED backward.   
     
     
         2 . The illumination structure of  claim 1 , wherein the first lens and the second lens are collectively configured to redistribute the light emitted by the LED to a wide solid angle. 
     
     
         3 . The illumination structure of  claim 2 , wherein the wide solid angle is 2π*[1−cos(100π/180)]. 
     
     
         4 . The illumination structure of  claim 1 , wherein the first lens and the second lens each have a respective inner surface and a respective outer surface, and wherein the inner and outer surfaces of the first and second lenses are each configured as one of: a hemisphere, a semiellipse, or a top portion having a concave recess and a side portion. 
     
     
         5 . The illumination structure of  claim 4 , wherein at least one of the inner and outer surfaces of the first and second lenses is shaped with the top portion having the concave recess and the side portion. 
     
     
         6 . The illumination structure of  claim 4 , wherein the LED is free of being in direct contact with the inner surface of the first lens. 
     
     
         7 . The illumination structure of  claim 6 , wherein the outer surface of the first lens is free of being in direct contact with the inner surface of the second lens. 
     
     
         8 . The illumination structure of  claim 1 , wherein the first lens and the second lens each contain a transparent material having a transmittance greater than about 90%. 
     
     
         9 . The illumination structure of  claim 8 , wherein the second lens further contains diffuser particles. 
     
     
         10 . The illumination structure of  claim 1 , further comprising a diffuser cap disposed over the second lens. 
     
     
         11 . An illumination structure comprising:
 a light-emitting diode (LED) device configured on a substrate;   a first lens secured on the substrate and covering the LED device; and   a second lens secured on the substrate and covering the first lens, wherein the first lens and the second lens are shaped and configured to redistribute light emitted from the LED device for wide angle illumination.   
     
     
         12 . The illumination structure of  claim 11 , wherein
 the first lens includes a first inner surface facing toward the LED device and a first outer surface facing away from the LED device;   the second lens includes a second inner surface facing toward the LED device and a second outer surface facing away from the LED device; and   each of the first inner surface, the first outer surface, the second inner surface, and the second outer surface is designed to have a shape selected from the group consisting of
 a portion of a hemisphere, 
 a portion of a semiellipse, and 
 a surface having a top portion with concave recess and a side portion. 
   
     
     
         13 . The illumination structure of  claim 11 , wherein each of the first lens and the second lens includes a transparent material selected from the group consisting of polycarbonate (PC) and poly(methyl methacrylate) (PMMA). 
     
     
         14 . The illumination structure of  claim 11 , wherein the second lens further includes diffusion particles dispersed in a transparent material for light diffusing effect. 
     
     
         15 . The illumination structure of  claim 11 , wherein the LED device includes a plurality of LED chips configured on the substrate. 
     
     
         16 . The illumination structure of  claim 11 , wherein the first lens is shaped with a batwing structure. 
     
     
         17 . The illumination structure of  claim 11 , further comprising a third lens cascaded with the first lens and the second lens to further redistribute the light emitted from the LED device. 
     
     
         18 . A method of masking an illumination structure, comprising:
 attaching a light-emitting diode (LED) device to a substrate;   attaching a first lens to the substrate, the first lens covering the LED device; and   attaching a second lens to the substrate, the second lens covering the first lens.   
     
     
         19 . The method of  claim 18 , further comprising forming the first lens shaped to redistribute emitting light from the LED device for wide angle illumination, before the attaching the first lens to the substrate. 
     
     
         20 . The method of  claim 19 , wherein the forming the first lens includes utilizing a technique selected from the group consisting of injection molding and extrusion molding.