Patent ID: 9157601
Filing Date: 2015-10-13
Classification: F21V,F21Y,G02B

Abstract:
1. A lens unit used for adjusting light emitted from a light source that emits dispersed light beams, the lens unit comprising: a first lens comprising a first light input surface, a first light output surface opposite to the first light input surface and a first side surface connected to the first light output surface, the first light output surface being an aspheric surface, the first lens having a first refractive index; and a second lens comprising a second light input surface and a second light output surface opposite to the second light input surface, the second lens defining a cavity at the second light input surface, the first lens being received in the cavity, and the second light input surface contacting the first light output surface and the first side surface of the first lens, the second lens having a second refractive index which less than the first refractive index; wherein the first light input surface of the first lens defines a cavity, the light source is received in the cavity defined by the first light input surface and is spaced from an inner surface of the cavity defined by the first light input surface; and wherein the dispersed light beams emitted from the light source directly enter the first lens, and then are sequentially diverged by the first lens and the second lens before emerging outside.