# US 8,770,800 B1 · LED-based light source reflector with shell elements > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,770,800 B1 - Document ID: US8770800B1 - Status: Granted - Kind: B1 - Application number: 14/204,960 - Filed: 2014-03-11 - Published: 2014-07-10 - Granted: 2014-07-08 - Earliest claimed: 2013-03-15 - Assignees: Xicato, Inc. - Applicants: Xicato, Inc. - Inventors: John S. Yriberri; Christopher R. Reed; Jim W. Li; Gerard Harbers - Web page: https://patentgrep.com/patent/US8770800B1 ## CPC - F21K 9/60: Optical arrangements integrated in the light source, e.g. for improving the colour rendering index or the light extraction - F21V 7/0025: {Combination of two or more reflectors for a single light source (array of reflectors for a cluster of light sources F21V7/0083)} - F21V 7/04: Optical design - F21V 11/02: using parallel laminae or strips, e.g. of Venetian-blind type (F21V11/06 takes precedence) - F21V 11/06: using crossed laminae or strips {, e.g. grid-shaped louvers}; using lattices or honeycombs - F21V 11/16: using sheets without apertures, e.g. fixed - F21V 13/04: the elements being reflectors and refractors {(for vehicle rear lights F21S43/40)} - F21V 13/10: the elements being reflectors and screens - F21V 13/14: the elements being filters or photoluminescent elements, reflectors and refractors - F21K 9/00: Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers - F21V 7/06: with parabolic curvature - F21V 29/00: Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems (lighting fixtures combined with outlets for air-treatment systems F24F13/078) - F21V 29/70: characterised by passive heat-dissipating elements, e.g. heat-sinks - F21Y 2115/10: Light-emitting diodes [LED] - F21K: NON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE; LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE; LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL; LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATING ELEMENTS; LIGHT SOURCES NOT OTHERWISE PROVIDED FOR - F21V: FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR - F21Y: INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED ## Abstract An optical element that may be replaceably mounted to an LED based illumination device. The optical element includes a hollow shell reflector and a plurality of annular shell elements disposed within the hollow shell reflector at different distances from the input port of the optical element. An annular shell element that is closer to the input port of the optical element has a radius that is less than the radius of an annular shell element farther from the input port. ## Claims ### Claim 1 An apparatus comprising: an LED based illumination device operable to emit light in a Lambertian pattern over a surface of an output window; and an optical element coupled to receive the light emitted from the output window of the LED based illumination device, the optical element having an input port and an output port, wherein a perimeter of the optical element increases in size from the input port to a maximum perimeter, the optical element comprising: a hollow shell reflector having a first height; a first annular shell element having a first radius and a second height that is less than the first height, the first annular shell element disposed within the hollow shell reflector; and a second annular shell element having a second radius and a third height, the second annular shell element disposed within the hollow shell reflector at a location closer to the input port of the optical element than a location of the first annular shell element, wherein the second radius is less than the first radius. ### Claim 2 (depends on 1) The apparatus of claim 1, wherein the second height of the first annular shell element is less than the third height of the second annular shell element. ### Claim 3 (depends on 1) The apparatus of claim 1, further comprising at least one additional annular shell element disposed within the hollow shell reflector at a location farther from the input port of the optical element than the location of the first annular shell element and having a radius that is greater than the first radius. ### Claim 4 (depends on 1) The apparatus of claim 1, wherein the amount of light emitted from the LED based illumination device passes through the input port of the optical element, wherein the input port is sized to match the output window of the LED based illumination device. ### Claim 5 (depends on 1) The apparatus of claim 1, wherein the first annular shell element and the second annular shell element include materials with scattering particles. ### Claim 6 (depends on 1) The apparatus of claim 1, wherein each of the first annular shell element and the second annular shell element includes inner and outer facing surfaces, and wherein light is reflected from the inner and outer facing surfaces. ### Claim 7 (depends on 1) The apparatus of claim 1, wherein the first annular shell element and the second annular shell element include perforations. ### Claim 8 (depends on 1) The apparatus of claim 1, wherein the second annular shell element has a curved cross-sectional profile. ### Claim 9 (depends on 1) The apparatus of claim 1, wherein the second annular shell element has a cross-sectional profile oriented at a non-zero angle with respect to an optical axis of the optical element. ### Claim 10 (depends on 1) The apparatus of claim 1, wherein the optical element is replaceably coupled to the LED based illumination device. ### Claim 11 (depends on 1) The apparatus of claim 1, further comprising: a lens element disposed within the hollow shell reflector. ### Claim 12 An optical element, comprising: an input port configured to receive light emitted from a planar light emitting area of an LED based illumination device; an output port configured to emit an amount of light; a hollow shell reflector having a first height; a first annular shell element having a first radius and a second height that is less than the first height, the first annular shell element disposed within the hollow shell reflector; and a second annular shell element having a second radius and a third height that is less than the first height, the second annular shell element disposed within the hollow shell reflector at a location closer to the input port of the optical element than a location of the first annular shell element, wherein the second radius is less than the first radius. ### Claim 13 (depends on 12) The optical element of claim 12, wherein the second height of the first annular shell element is less than the third height of the second annular shell element. ### Claim 14 (depends on 12) The optical element of claim 12, further comprising at least one additional annular shell element disposed within the hollow shell reflector at a location farther from the input port of the optical element than the location of the first annular shell element and having a radius that is greater than the first radius. ### Claim 15 (depends on 12) The optical element of claim 12, wherein the second annular shell element has a curved cross-sectional profile. ### Claim 16 (depends on 12) The optical element of claim 12, wherein the second annular shell element has a cross-sectional profile oriented at a non-zero angle with respect to an optical axis of the optical element. ### Claim 17 (depends on 12) The optical element of claim 12, wherein the hollow shell reflector is disposed at the input port of the optical element and extends to the output port. ### Claim 18 An optical element, comprising: an input port configured to receive light emitted from a planar light emitting area of an LED based illumination device; an output port configured to emit an amount of light; a hollow shell reflector having a first height; a first annular shell element having a first diameter and a second height that is less than the first height; a curved, annular shell element having a second diameter that is less than the first diameter, and a third height that is greater than the second height and less than the first height; a second annular shell element having a third diameter that is less than the second diameter and a fourth height that is less than the third height, wherein the curved, annular shell element and the first annular shell element and the second annular shell elements are disposed within the hollow shell reflector. ### Claim 19 (depends on 18) The optical element of claim 18, wherein the curved, annular shell element includes an inward facing surface and an outward facing surface, wherein the inward facing surface is more reflective than the outward facing surface. ### Claim 20 (depends on 18) The optical element of claim 18, wherein a top of the second annular shell element is flush with a top of the hollow shell reflector.