# US 12,007,100 B2 · Illumination device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,007,100 B2 - Document ID: US12007100B2 - Status: Granted - Kind: B2 - Application number: 17/918,814 - Filed: 2021-04-09 - Published: 2023-05-11 - Granted: 2024-06-11 - Earliest claimed: 2020-04-14 - Assignees: Signify Holding B.V. - Applicants: Signify Holding B.V. - Inventors: Romain Hameau - Web page: https://patentgrep.com/patent/US12007100B2 ## CPC - F21V 19/003: {Fastening of light source holders, e.g. of circuit boards or substrates holding light sources} - F21V 5/007: {Array of lenses or refractors for a cluster of light sources, e.g. for arrangement of multiple light sources in one plane (combination of two or more refractors F21V5/008)} - F21V 17/12: by screwing - F21V 17/164: {the parts being subjected to bending, e.g. snap joints} - F16B 39/26: with spring washers fastened to the nut or bolt-head - F21Y 2105/10: comprising a two-dimensional [2D] array of point-like light-generating elements - F21Y 2105/16: square or rectangular, e.g. for light panels - 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 - F16B: DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING (couplings for transmitting rotation F16D) - 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 illumination device comprising an optical plate extending over a plurality of LEDs arranged on a PCB main surface of a PCB. In a mounted configuration said PCB and optical plate are mutually connected by fasteners. Each fastener extends with play in a plane parallel to said PCB main surface through a through hole in the optical plate in a direction transverse to said PCB main surface. The through hole has a wide portion extending over a depth D from a first main surface of the optical plate facing away from the PCB towards a second main surface of the optical plate facing towards the PCB, and said through hole is narrowed to a neck portion at said depth D. Furthermore, each fastener rests on a resilient washer seated in the wide portion of said through hole. ## Claims ### Claim 1 An illumination device comprising an optical plate extending over a plurality of LEDs arranged on a PCB main surface of a PCB, in a mounted configuration said PCB and optical plate are mutually connected by a plurality of fasteners, wherein each fastener extends through a respective, associated through hole in the optical plate in a direction transverse to said PCB main surface, wherein said associated through hole has a wide portion extending over a depth D from a first main surface of the optical plate facing away from the PCB towards a second main surface of the optical plate facing towards the PCB, which through hole is narrowed to a neck portion at said depth D, and wherein each fastener extends through said through hole with play S in a plane P parallel to said PCB main surface and rests on a respective, associated resilient washer seated in the wide portion of said associated through hole, wherein the wide portion comprises a tapered portion which gradually, preferably continually, tapers along depth D, and wherein the washer is a toothed washer, preferably with teeth extending outward. ### Claim 2 (depends on 1) An illumination device as claimed in claim 1, wherein the play S is in each direction in the plane P parallel to said PCB main surface. ### Claim 3 (depends on 1) An illumination device as claimed in claim 1, wherein the optical plate has a local thickness T at the through hole, and wherein the wide portion is a recess in the first main surface of the optical plate extending over the depth D, wherein 0.25*T<=D<=0.85*T. ### Claim 4 (depends on 1) An illumination device as claimed in claim 1, wherein the fastener comprises an elongated portion and a head at an end thereof, said elongated portion has a diameter Df in a direction parallel to the main surface, wherein the play S in the neck portion is in the range of 0.1*Df<=S<=0.3*Df. ### Claim 5 (depends on 1) An illumination device as claimed in claim 1, wherein teeth are at an angled position β with the normal to the base ring of the wherein β and the wide portion of the through hole has an average tapering angle α, wherein α<=β<=α+5°. ### Claim 6 (depends on 1) An illumination device as claimed in claim 1, wherein the tapered portion has an average tapering angle α with respect to a normal to the first main surface, wherein 30°<=α<=70°. ### Claim 7 (depends on 1) All illumination device as claimed in claim 1, wherein the washer is made of spring steel or of resilient polymer/plastic. ### Claim 8 (depends on 1) An illumination device as claimed in claim 1, wherein the fastener is selected from the group consisting of a threaded fastener, a bolt, a screw, a snap-click, a split-pen. ### Claim 9 (depends on 1) An illumination device as claimed in claim 1, wherein the optical plate and the PCB are maintained at a predetermined distance by the plurality of fasteners. ### Claim 10 (depends on 1) An illumination device as claimed in claim 1, comprising spacers of a predetermined height positioned in between the optical plate and PCB at the location of the through holes and through which a respective, associated fastener of the plurality of fastener extends. ### Claim 11 (depends on 1) An illumination device as claimed in claim 1, wherein the washer is a serrated washer. ### Claim 12 (depends on 1) An illumination device as claimed in claim 1, wherein the washer comprises n teeth, wherein 3<=n<=24. ### Claim 13 (depends on 1) An illumination device as claimed in claim 1, wherein the resilient washer is a star-shaped washer. ### Claim 14 (depends on 1) An illumination device as claimed in claim 1, wherein the washer is circularly shaped and has a largest diameter Dw and the teeth have a length L, wherein 0.1*Dw<=L<=0.4*Dw. ### Claim 15 (depends on 1) An illumination device as claimed in claim 1, wherein the tapered portion has an average tapering angle α with respect to a normal to the first main surface, wherein 40°<=α<=60°. ### Claim 16 (depends on 1) An illumination device as claimed in claim 1, wherein the washer comprises n teeth, wherein 4<=n<=12.