# US 10,871,281 B2 · Lighting device with light guide > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,871,281 B2 - Document ID: US10871281B2 - Status: Granted - Kind: B2 - Application number: 15/745,269 - Filed: 2016-07-20 - Published: 2018-08-02 - Granted: 2020-12-22 - Earliest claimed: 2015-07-20 - Assignees: Signify Holding B.V. - Applicants: Signify Holding B.V. - Inventors: Antonius Adrianus Maria Marinus; Erik Paul Boonekamp; Hendrik Jan Eggink - Web page: https://patentgrep.com/patent/US10871281B2 ## CPC - F21V 29/503: of light sources (cooling arrangements structurally associated with gas-discharge or vapour-discharge lamps H01J61/52; cooling arrangements structurally associated with electric incandescent lamps H01K1/58; cooling arrangements structurally associated with light-emitting diodes H10H20/858) - F21K 9/232: specially adapted for generating an essentially omnidirectional light distribution, e.g. with a glass bulb - F21K 9/238: Arrangement or mounting of circuit elements integrated in the light source - F21K 9/61: using light guides - F21V 23/003: {the elements being electronics drivers or controllers for operating the light source, e.g. for a LED array} - F21V 29/70: characterised by passive heat-dissipating elements, e.g. heat-sinks - G02B 6/002: {by shaping at least a portion of the light guide, e.g. with collimating, focussing or diverging surfaces} - G02B 6/0036: {2-D arrangement of prisms, protrusions, indentations or roughened surfaces} - G02B 6/0085: {Means for removing heat created by the light source from the package} - F21Y 2101/00: Point-like light sources - F21Y 2105/10: comprising a two-dimensional [2D] array of point-like light-generating elements - F21Y 2115/10: Light-emitting diodes [LED] - F21V: FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR - 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 - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS - 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 A lighting device (100, 500) is provided which comprises a light guide (110, 510), a metal strip (120, 520), a solid state light source (130, 530) and a base (160, 170, 540, 550) for mounting the lighting device. The base includes an electrical interface. The light guide extends along a plane (140). The metal strip extends at least partly around the light guide along a surface (111) of the light guide. The metal strip is arranged in thermal contact with the surface of the light guide. The solid state light source is arranged in thermal contact with the metal strip and is arranged to emit light into the light guide. The light guide serves to increase a light emitting area of the lighting device and to dissipate heat. The metal strip allows heat generated by the solid state light source to be transferred to the light guide. ## Claims ### Claim 1 A lighting device comprising: a longitudinal axis; a light guide extending along a plane positioned parallel to said longitudinal axis; said light guide having at least two main surfaces and an edge joining said main surfaces; said main surfaces being arranged for emitting light from said lighting device; a metal strip extending at least partly around the light guide along the edge of the light guide, the metal strip being arranged in thermal contact with the edge, wherein the width of the metal strip exceeds the thickness of the metal strip, wherein the width of the metal strip is measured in a direction from a first main surface of said at least two main surfaces to a second main surface of said at least two main surfaces and wherein the thickness of the metal strip is measured from said light-guide to an outermost portion of said metal strip away from said light guide, wherein the metal strip comprises at least one perforation such that a portion of said light emitted into the light guide is transmitted out of the lighting device through said at least one perforation; a solid state light source arranged in thermal contact with the metal strip and arranged to emit light into a portion of the edge of the light guide; said solid state light source being configured to transfer heat to the metal strip and the light guide, the light guide being arranged for dissipating heat to the ambient, both the metal strip and the light guide serving as heat sink; and a base for mounting the lighting device, the base including an electrical interface for connecting the sold state light source to an electrical power supply. ### Claim 2 (depends on 1) The lighting device of claim 1, wherein the solid state light source is arranged between the light guide and the metal strip. ### Claim 3 (depends on 2) The lighting device of claim 2, comprising a plurality of solid state light sources distributed around the light guide between the light guide and the metal strip, the plurality of solid state light sources being arranged to emit light into the center of the light guide. ### Claim 4 (depends on 1) The lighting device of claim 1, wherein the thickness of the metal strip is between 2 to 5 millimeters. ### Claim 5 A lighting device comprising: a longitudinal axis; a light guide extending along a plane positioned parallel to said longitudinal axis; said light guide having at least two main surfaces and an edge joining said main surfaces; said main surfaces being arranged for emitting light from said lighting device; a metal strip extending at least partly around the light guide along the edge of the light guide, the metal strip being arranged in thermal contact with the edge; a solid state light source arranged in thermal contact with the metal strip and arranged to emit light into a portion of the edge of the light guide; said solid state light source being configured to transfer heat to the metal strip and the light guide, the light guide being arranged for dissipating heat to the ambient, both the metal strip and the light guide serving as heat sink, wherein the metal strip comprises at least one perforation such that a portion of said light emitted into the light guide is transmitted out of the lighting device through said at least one perforation; and a base for mounting the lighting device, the base including an electrical interface for connecting the sold state light source to an electrical power supply. ### Claim 6 (depends on 5) The lighting device of claim 5, wherein the base includes a cap for mounting the lighting device in a socket. ### Claim 7 (depends on 5) The lighting device of claim 5, wherein the light guide comprises glass or polymer material. ### Claim 8 (depends on 5) The lighting device of claim 5, wherein the light guide extends at least four times more in a direction along said plane than along a normal to said plane. ### Claim 9 (depends on 5) The lighting device of claim 5, wherein the metal strip extends at least a third of a full revolution around the light guide, or wherein the lighting device comprises at least two metal strips together extending at least a third of a full revolution around the light guide. ### Claim 10 (depends on 5) The lighting device of claim 5, wherein the metal strip is arranged in direct physical contact with said surface of the light guide or wherein a distance between the metal strip and said surface of the light guide is less than 200 micrometer. ### Claim 11 (depends on 5) The lighting device of claim 5, wherein the solid state light source is arranged between the light guide and the metal strip. ### Claim 12 (depends on 5) The lighting device of claim 5, comprising a plurality of solid state light sources distributed around the light guide between the light guide and the metal strip, the plurality of solid state light sources being arranged to emit light into the light guide. ### Claim 13 (depends on 5) The lighting device of claim 5, wherein the light guide has a cavity in which the solid state light source is arranged. ### Claim 14 (depends on 5) The lighting device of claim 5, wherein at least a side of the metal strip facing the light guide has at least 80 percent reflectivity. ### Claim 15 (depends on 5) The lighting device of claim 5, wherein the metal strip has a width which is smaller than a width of said edge, wherein said width of the metal strip and said width of the edge are measured in a direction from a first main surface of said at least two main surfaces to a second main surface of said at least two main surfaces. ### Claim 16 (depends on 5) The lighting device of claim 5, further comprising an incoupling structure for coupling light from the solid state light source into the light guide. ### Claim 17 (depends on 5) The lighting device of claim 5, further comprising an outcoupling structure for coupling light propagating within the light guide out of the light guide. ### Claim 18 (depends on 5) The lighting device of claim 5, further comprising driver electronics for controlling the solid state light source, wherein: the light guide has a cavity in which the driver electronics are arranged; or the lighting device further comprises a housing in which the driver electronics are arranged. ### Claim 19 (depends on 5) The lighting device of claim 5, wherein the metal strip comprises a flat metal band configured to be folded around the edge of the light guide.