Patent ID: 9599802
Date: 2017-03-21
CPC Classifications: F21V,G02B,G02F

Claim:
1. A lens, comprising: a central portion, having a first optical surface and a second optical surface opposite to the first optical surface; and a surrounding portion, surrounding the central portion while taking a symmetry axis of the central portion as a center, and having a bottom surface, an inner refraction wall and an outer refraction wall opposite to the inner refraction wall, wherein the inner refraction wall is connected to the first optical surface to form a recess, and the recess is used for accommodating a light emitting diode, the outer refraction wall comprises a first outer surface and a second outer surface, the first outer surface is connected to the second optical surface, and the second outer surface is connected to the first outer surface, wherein taking the symmetry axis as a center, a distance between the symmetry axis and a junction of the inner refraction wall and the first optical surface is a first radius R wherein the first optical surface is protruding towards the light emitting diode, the second optical surface is recessed towards the light emitting diode, wherein an included angle between the first outer surface and a normal vector of the bottom surface is θ wherein the included angle θ wherein the included angle θ