Patent ID: 8405297
Filing Date: 2013-03-26
Classification: H01L,Y10T

Abstract:
1. An illumination device, comprising: a base; an illumination chip disposed on the base; and a sealant covering the illumination chip, the sealant having an outer surface including an inner circular convex and an outer circular convex surrounding the inner circular center convex, and having a radial cross section passing through the center of the sealant and perpendicular to the base; wherein the inner circular convex encloses a first space having a narrow bottom and a wide opening, wherein the illumination chip is located within a projection area of the inner circular convex on the base, a part of the light emitted from the illumination chip is reflected from the inner circular convex directly to the outer circular convex and leaves the sealant directly from the outer circular convex; the outer circular convex and the inner circular convex respectively have a first radius of curvature and a second radius of curvature on the same radial cross section of the sealant, wherein a sum of the first radius of curvature and the second radius of curvature is between a radius and a diameter of the radial cross section, the first radius of curvature is different from the second radius of curvature, and a ratio of the first radius of curvature to the largest height of the sealant on the radial cross section is between 0.6 and 1.