Patent ID: 8356919
Filing Date: 2013-01-22
Classification: F21V,F21Y,G02B

Abstract:
1. A lens for refracting light emitted by an LED, comprising a base for receiving the LED therein and a light refracting portion protruding upwardly from the base, the light refracting portion defining a concaved inner face at a bottom thereof for incidence of the light into the light refracting portion and an opposite convex outer face at a top thereof for refracting the light out of the light refracting portion, the inner face being aspherical, and the outer face being spherical, the inner face being centrosymmetrical relative to a first axis, the outer face being centrosymmetrical relative to a second axis which is coincident with the first axis; wherein a curvature of the inner face at a center thereof is larger than that of the inner face at an edge thereof, the curvature of the inner face is gradually reduced from the center to the edge thereof, the curvature of the center of the inner face is 0.26 mm