Patent ID: 8757835
Filing Date: 2014-06-24
Classification: F21S,F21V,F21Y

Abstract:
1. A variable shaped lamp shade of an LED lamp, and the lamp shade being made of a translucent material matched with a plurality of LED lamp strips and a plurality of lamp holders, and the lamp shade comprising: at least one optical refraction unit arranged to form a ring-shaped lamp shade and having an external refractive surface, an internal refractive surface corresponding to the external refractive surface, and an assembling structure used for matching the respective lamp holders, wherein two reflective surfaces are formed on and coupled to lateral sides of the external refractive surface and the internal refractive surface, respectively, the reflective surfaces being outwardly convex curved surfaces, the optical refraction unit causing a light beam emitted from the LED lamp strips to undergo a first-time refraction when passing through the internal refractive surface, causing a light beam incident on the reflective surfaces to reflect off the reflective surfaces, fall on the external refractive surface, and undergo a second-time refraction when passing through the external refractive surface, such that an angle of the light distribution at the edges is controlled within a range from 7 degrees to 40 degrees, wherein the external refractive surface of the optical refraction unit is a non-spherical surface, and the internal refractive surface of the optical refraction unit is a curved surface without an inflection point, and the curved surface has a constant or gradually changing curvature.