Patent ID: 9568768
Date: 2017-02-14
CPC Classifications: F21K,F21V,F21Y,G02B,G02F

Claim:
1. An optical apparatus for use with a light source comprising at least one light emitting diode (LED), the apparatus comprising: a single-piece, light-transmitting body comprising a top, a bottom and a side interconnecting the top and the bottom, wherein an imaginary central axis of the body passes through the top and the bottom and does not pass through the side; at least one top curved surface formed on the top of the body; a bottom cavity formed into the body in a central portion of the bottom such that the central axis passes through the bottom cavity, wherein the bottom cavity is arranged relative to the light source such that the light source is placed under the bottom cavity and the central axis passes through the light source along with the top and bottom cavity and further such that the bottom cavity comprises at least one light input surface configured to receive light beams from the light source that are not reflected while propagating from the light source to the at least one light input surface when the bottom cavity and the light source are so arranged; and microstructures configured to diffuse light beams incident thereto and formed on the bottom of the body, wherein the microstructures comprise a first microstructure that provides a plurality of micro-surfaces having different tangential planes, which enables two or more parallel light beams incident to the first microstructure to reach different micro-surfaces that would let the two or more parallel light beams leave the first microstructure in different directions, wherein all or part of the plurality of micro-surfaces are continuously curved with or discretely separated from their immediately neighboring micro-surfaces.