Lens for wide diffusion light

Abstract

Disclosed herein is a light diffusion lens. The light diffusion lens according to one embodiment of the present disclosure includes a bottom surface, an incidence surface concavely formed inward the bottom surface from one area (an incidence hole) thereof, and an exit surface from which light incident through the incidence surface is emitted, wherein at least two protrusions are formed on the incidence surface symmetrically in relation to an optical axis or at least two second dimples are formed on the exit surface symmetrically in relation to the optical axis.

What is claimed is: 
     
         1 . A light diffusion lens comprising:
 a bottom surface;   an incidence surface concavely formed inward the bottom surface from one area (an incidence hole) thereof; and   an exit surface from which light incident through the incidence surface is emitted,   wherein at least two protrusions are formed on the incidence surface symmetrically in relation to an optical axis.   
     
     
         2 . The light diffusion lens of  claim 1 , wherein each of the at least two protrusions is disposed within a predetermined divergence angle based on the optical axis, and the divergence angle is less than or equal to 50 degrees. 
     
     
         3 . The light diffusion lens of  claim 1 , wherein each of the at least two protrusions is convexly formed from the incidence surface toward the optical axis. 
     
     
         4 . The light diffusion lens of  claim 3 , wherein an edge at which the at least two protrusions and the incidence surface meet has a circular shape. 
     
     
         5 . The light diffusion lens of  claim 1 , wherein the sum of areas of the at least two protrusions is less than or equal to 30% of an entire area of the incidence surface. 
     
     
         6 . The light diffusion lens of  claim 1 , wherein any point on each of the at least two protrusions corresponds to the center of the height of the incidence surface. 
     
     
         7 . The light diffusion lens of  claim 1 , wherein at least two dimples are formed on the exit surface symmetrically in relation to the optical axis. 
     
     
         8 . The light diffusion lens of  claim 7 , wherein each of the at least two dimples is disposed within a predetermined divergence angle based on the optical axis, and an angle between the optical axis and a center of each of the at least two dimples ranges from about 36 degrees to about 40 degrees. 
     
     
         9 . The light diffusion lens of  claim 7 , wherein each of the at least two dimples has an elliptical shape. 
     
     
         10 . A light diffusion lens comprising:
 a bottom surface having an elliptical shape;   an incidence surface concavely formed inward the bottom surface from one area (an incidence hole) thereof; and   an exit surface from which light incident through the incidence surface is emitted,   wherein at least two dimples are disposed on the exit surface symmetrically in relation to an optical axis.   
     
     
         11 . The light diffusion lens of  claim 10 , wherein each of the at least two dimples is disposed within a predetermined divergence angle based on the optical axis, and an angle between the optical axis and a center of each of the at least two dimples ranges from about 36 degrees to about 40 degrees. 
     
     
         12 . The light diffusion lens of  claim 10 , wherein each of the at least two dimples has an elliptical shape.