# US 10,865,975 B2 · Heat sink lighting device and method for manufacturing a heat sink > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,865,975 B2 - Document ID: US10865975B2 - Status: Granted - Kind: B2 - Application number: 15/747,144 - Filed: 2016-07-18 - Published: 2018-07-26 - Granted: 2020-12-15 - Earliest claimed: 2015-08-04 - Assignees: Signify Holding B.V. - Applicants: Signify Holding B.V. - Inventors: Gwendolin Anita Luiten; Frank De Leeuw - Web page: https://patentgrep.com/patent/US10865975B2 ## CPC - F21V 29/713: {in direct thermal and mechanical contact of each other to form a single system} - F21V 29/763: {the planes containing the fins or blades having the direction of the light emitting axis} - F28F 3/06: the means being attachable to the element - F28F 3/08: Elements constructed for building-up into stacks, e.g. capable of being taken apart for cleaning - F21Y 2101/00: Point-like light sources - F21Y 2115/10: Light-emitting diodes [LED] - F28D 2021/0029: {Heat sinks} - F28F 2215/00: Fins - F28F 2255/08: pressed; stamped; deep-drawn - F28F 2275/04: by brazing - F28F 2275/12: by methods involving deformation of the elements - H05K 7/20154: {Heat dissipaters coupled to components} - H10W 40/226: {characterised by projecting parts, e.g. fins to increase surface area (leadframes for cooling H10W70/461)} - F21V: FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR - F28F: DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION (water and air traps, air venting F16) - 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 - F28D: HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT (fluid heaters having heat generating means and heat transferring means F24H; furnaces F27; details of heat-exchange apparatus of general) - H05K: PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS - H10W: GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10 ## Abstract A finned heat sink (1) comprising a stack of N finned heat sink plates (3). The N finned heat sink plates comprise a top plate (3a) on top of a bottom plate (3b) and optionally at least one sandwiched plate (3c). The bottom plate (3b), the top plate (3a) and the sandwiched plate (3c) comprise a heat dissipating fin (9) and an opening (7). The fins (9) are bent out of plane of the plates (3). The fin (9) of the bottom plate (3b) and the sandwiched plate (3c) extend through the opening (7a) in the top plate (3a) in the same direction as the fin (9a) of the top plate (3a). ## Claims ### Claim 1 A finned heat sink comprising: a plurality of N heat sink plates including at least a bottom plate and a top plate, each of the heat sink plates including at least two heat dissipating fins, wherein a first edge of each heat dissipating fin is bent out of a plane of the respective heat sink plate, each heat sink plate further includes a base part with an opening, wherein the base part of the top plate is on top of the base part of the bottom plate and wherein a heat dissipating fin of the bottom plate is bent and extends through the opening in the top plate, a heatsink base wherein the plurality of N heat sink plates are mounted, wherein each heat sink plate has a thickness T and the heatsink base comprises a profile step with a profile size Ps according to the relation Ps=O/N, wherein O is the distance between two adjacent first edges of the at least two heat dissipating fins in the base part of the top heat sink plate transverse to the first edge, and Ps is measured along the plane P of the base part of the top heat sink plate in a direction transverse to the first edge, each step having a height H essentially equal to said thickness T. ### Claim 2 (depends on 1) The finned heat sink as claimed in claim 1, wherein for each heat sink plate, the heat dissipating fins have a perimeter comprising a first edge part, said heat dissipating fins being cut out from the base part over said perimeter except for said first edge part. ### Claim 3 (depends on 1) The finned heat sink as claimed in claim 1, wherein the plurality of N heat sink plates comprises a sandwiched plate located in between the top and bottom plate, a fin of the sandwiched plate extends through the opening of the top plate. ### Claim 4 (depends on 1) The finned heat sink as claimed in claim 1, wherein the heat dissipating fins have a surface area essentially of a size equal to a size of the opening bordered by the first edge of said respective fin. ### Claim 5 (depends on 1) The finned heat sink as claimed in claim 1, wherein the heat dissipating fins of the heat sink plates are spaced apart by a spacing S according to the relation S=O/N, wherein O is the distance between two adjacent first edges of the at least two heat dissipating fins in the base part of the top heat sink plate transverse to the first edge, and S is measured along the plane of the base part of the top heat sink plate in a direction transverse to the first edge. ### Claim 6 (depends on 1) The finned heat sink as claimed in claim 1, wherein the heat sink plates abut each other with the base parts and are mutually fixed. ### Claim 7 (depends on 1) The finned heat sink as claimed in claim 1, wherein a heat conducting filler material is provided in between the heatsink base and the base parts of adjacent heat sink plates. ### Claim 8 (depends on 1) The finned heat sink as claimed in claim 1, wherein N is in the range of 2 to 10. ### Claim 9 (depends on 1) The finned heat sink as claimed in claim 1, wherein the openings formed by the bending of material out of the plane of the respective heat sink plate to form a single fin of the heat dissipating fins, is larger than the respective single fin. ### Claim 10 (depends on 1) The finned heat sink as claimed in claim 1, wherein a single opening is formed by bending material out of plane of the heat sink plate to form a plurality of fins of the heat dissipating fins. ### Claim 11 (depends on 1) A lighting device comprising a finned heat sink according to claim 1. ### Claim 12 (depends on 11) Lighting device as claimed in claim 11, wherein the lighting device is a LED lamp. ### Claim 13 (depends on 1) The finned heat sink as claimed in claim 1, wherein N is in the range of 3 to 6.