# US 8,465,183 B2 · Lighting device and method for manufacturing same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,465,183 B2 - Document ID: US8465183B2 - Status: Granted - Kind: B2 - Application number: 12/097,081 - Filed: 2006-12-04 - Published: 2010-10-21 - Granted: 2013-06-18 - Earliest claimed: 2005-12-14 - Assignees: Koninklijke Philips Electronics N.V. - Applicants: Gunnar Luettgens; Benno Spinger; Egbert Lenderink; Daniël Anton Benoy - Inventors: Gunnar Luettgens; Benno Spinger; Egbert Lenderink; Daniël Anton Benoy - Web page: https://patentgrep.com/patent/US8465183B2 ## CPC - F21S 45/48: with means for conducting heat from the inside to the outside of the lighting devices, e.g. with fins on the outer surface of the lighting device - F21V 29/51: using condensation or evaporation of a fluid, e.g. heat pipes - F21V 29/58: characterised by the coolants - F21V 29/763: {the planes containing the fins or blades having the direction of the light emitting axis} - F21V 29/767: {the planes containing the fins or blades having directions perpendicular to the light emitting axis} - F21V 29/777: {the planes containing the fins or blades having directions perpendicular to the light emitting axis} - F21V 29/85: characterised by the material (liquid coolants F21V29/56) - F21Y 2115/10: Light-emitting diodes [LED] - H10H 20/8586: {comprising fluids, e.g. heat-pipes} - F21S: NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS - 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 - H10H: INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS ## Abstract A lighting device (1) comprising an LED-unit (5), a collimator (2) and a housing (3), the LED-unit (5) is rigidly coupled to the collimator (2) only, so that no substantial forces can be applied to the LED-unit (5). A non-rigid heat transferring medium (10) is provided in a cavity (12) in the housing (3), to dissipate heat, generated by the LED-unit (5). The LED-unit (5) is therefore at least partly contained in the heat transferring medium (10). ## Claims ### Claim 1 A lighting device comprising an LED-unit that includes an LED-die mounted on a heat spreader, a collimator, that is mounted at least partly in a housing, and a non-rigid heat transferring medium, contained in a cavity in the housing, wherein: the LED-unit is rigidly coupled to the collimator only and the heat spreader is at least partly contained in the heat transferring medium to dissipate heat generated by the LED-unit; the collimator has a lower surface for receiving light from the LED-unit and an upper surface from which collimated light is emitted; and the LED die has a light emitting surface that is in direct contact with the lower surface of the collimator. ### Claim 2 (depends on 1) The device of claim 1, wherein the collimator is a TIR collimator. ### Claim 3 (depends on 1) The device of claim 1, wherein the LED-unit is coupled to the collimator by means of inorganic glue, glass frits or by injection molding. ### Claim 4 (depends on 1) The device of claim 1, wherein the heat transferring medium is gel-like or liquid. ### Claim 5 (depends on 4) The device of claim 4, wherein the cavity is dimensioned so that the LED-unit is at least partly contained in the liquid heat transferring medium, independent of the mounting position of the lighting device. ### Claim 6 (depends on 4) The device of claim 4, wherein the liquid heat transferring medium is a heat-pipe fluid. ### Claim 7 (depends on 1) The device of claim 1, wherein the cavity comprises porous, fibrous or wick-like structures. ### Claim 8 (depends on 1) The device of claim 1, wherein the collimator comprises at least one conductive layer connected to the LED-unit, designed to connect the LED-unit to a power supply. ### Claim 9 (depends on 1) A lighting system that comprises a lighting device according to claim 1 and a power supply unit that is connected to the LED-unit. ### Claim 10 A manufacturing method for a lighting device in which a surface of a collimator is rigidly coupled to a light-emitting surface of an LED-die that is mounted on a heat spreader, the collimator is mounted at least partly in a housing and a non-rigid heat transferring medium is fed into a cavity which is provided in the housing, so that the heat spreader is at least partly contained in the heat transferring medium. ### Claim 11 A method comprising: providing a collimator having a lower surface and an upper surface; providing an LED-unit having a heat spreader upon which is mounted an LED-die with a light emitting surface; situating the light emitting surface to be in direct contact with the lower surface of the collimator; mounting the collimator with attached LED-unit in a housing; and feeding a non-rigid heat transferring medium into a cavity of the housing, so that the LED-unit is at least partly contained in the medium. ### Claim 12 (depends on 11) The method of claim 11, wherein the heat spreader includes at least one of direct bonded copper, ceramics, silicon, or metal material. ### Claim 13 (depends on 11) The method of claim 11, wherein attaching the light emitting surface to the lower surface of the collimator includes molding the collimator upon the LED-unit. ### Claim 14 (depends on 11) The method of claim 11, wherein attaching the light emitting surface to the lower surface of the collimator includes applying heat and pressure to glass frites disposed between the collimator and the LED-unit. ### Claim 15 (depends on 11) The method of claim 11, wherein attaching the light emitting surface to the lower surface of the collimator includes applying inorganic glue between the collimator and the LED-unit. ### Claim 16 (depends on 11) The method of claim 11, including providing a reflective coating to the collimator in a part of the collimator in vicinity of where the LED-unit is attached. ### Claim 17 (depends on 1) The device of claim 1, wherein the collimator includes a GRIN lens. ### Claim 18 (depends on 1) The device of claim 1, wherein the housing includes one or more heat dissipation elements. ### Claim 19 (depends on 1) The device of claim 1, wherein one or more other LED-dies are mounted on the heat spreader, each having a light emitting surface that is in direct contact with the lower surface of the collimator. ### Claim 20 (depends on 11) The method of claim 11, wherein one or more other LED-dies are mounted on the heat spreader, each having a light emitting surface that is in direct contact with the lower surface of the collimator.