Patent ID: 8944657
Filing Date: 2015-02-03
Classification: F21K,G02B,H01L

Abstract:
1. A light source, comprising: a light-emitting device to emit electromagnetic radiation from an emitting surface; and an optical element having a light input surface, a light output surface, and side surfaces connecting the light input surface to the light output surface; wherein: the entire light input surface is located in the optical path of the light-emitting device, in front of the emitting surface, so that the electromagnetic radiation enters the optical element through the light input surface; the light input surface has a concave curvature and an area smaller than an area of the light output surface; the entire light input surface is separated from the emitting surface by a distance greater than or equal to about 0.8 mm and less than or equal to about 2 mm, forming a gap between the light-emitting device and the optical element; and a first bluish part of the electromagnetic radiation directly and completely illuminates the entire light output surface; and a second yellowish part of the electromagnetic radiation completely illuminates the entire light output surface after being reflected by the side surfaces towards the light output surface.