# US 11,906,113 B2 · Spiral LED filament lamp with a cylindrical two-dimensional flexible printed circuit board (PCB) and a method of producing a spiral LED filament with a cyclindrical two-dimensional flexible printed circuit board (PCB) > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,906,113 B2 - Document ID: US11906113B2 - Status: Granted - Kind: B2 - Application number: 17/775,433 - Filed: 2020-11-03 - Published: 2022-12-01 - Granted: 2024-02-20 - Earliest claimed: 2019-11-11 - Assignees: Signify Holding B.V. - Applicants: Signify Holding B.V. - Inventors: Ties Van Bommel; Rifat Ata Mustafa Hikmet - Web page: https://patentgrep.com/patent/US11906113B2 ## CPC - F21K 9/232: specially adapted for generating an essentially omnidirectional light distribution, e.g. with a glass bulb - H05K 1/028: {Bending or folding regions of flexible printed circuits (H05K1/0283 takes precedence)} - F21K 9/238: Arrangement or mounting of circuit elements integrated in the light source - F21Y 2107/30: on the outer surface of cylindrical surfaces, e.g. rod-shaped supports having a circular or a polygonal cross section - F21Y 2107/70: on flexible or deformable supports or substrates, e.g. for changing the light source into a desired form - F21Y 2115/10: Light-emitting diodes [LED] - H05K 1/118: {specially for flexible printed circuits, e.g. using folded portions} - H05K 2201/05: Flexible printed circuits [FPCs] - H05K 2201/051: Rolled - H05K 2201/10106: Light emitting diode [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 - H05K: PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS - 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 The present invention relates to an LED filament lamp (10) comprising a two-dimensional flexible printed circuit board (100), PCB, having a first and a second opposing connection end portions (110, 120). The two-dimensional flexible PCB (100) comprises a plurality of filaments lines (130a-d) extending from the first connection end portion (110) to the second connection end portion (120), wherein each filament line (130a) comprises an array of LEDs (130a1-130aN). The two-dimensional flexible PCB (100) is arranged in a cylinder shape by connecting the first and the second opposing connection end portions (110, 120) such that each (130a) of the plurality of filament lines (130a-d) is connected to another (130b) one of the plurality of filament lines (130a-d) thereby a spiral LED filament (150) is formed by the plurality of filament lines (130a-d). ## Claims ### Claim 1 An LED filament lamp comprising: a two-dimensional flexible printed circuit board, PCB, having a first and a second opposing connection end portions, the two-dimensional flexible PCB comprises a plurality of filaments lines extending from the first connection end portion to the second connection end portion, wherein each filament line comprises an array of LEDs, wherein the two-dimensional flexible PCB is arranged in a cylinder shape by connecting the first and the second opposing connection end portions such that each of the plurality of filament lines is connected to another one of the plurality of filament lines thereby a spiral LED filament is formed by the plurality of filament lines. ### Claim 2 (depends on 1) The LED filament lamp according to claim 1, wherein the plurality of filament lines are parallelly arranged on the two-dimensional flexible PCB. ### Claim 3 (depends on 1) The LED filament lamp according to claim 1, wherein an end of a filament line of the plurality of filament lines arranged at the first connection end portion is connected to a beginning of an adjacent filament line of the plurality of filament lines arranged at the second connection end portion. ### Claim 4 (depends on 1) The LED filament lamp according to any claim 1, wherein the plurality of filament lines have the same width (W). ### Claim 5 (depends on 1) The LED filament lamp according to claim 1, wherein the plurality of filament lines are linear. ### Claim 6 (depends on 1) The LED filament lamp according to claim 1, wherein the plurality of filament lines are diagonally arranged on the two-dimensional flexible PCB. ### Claim 7 (depends on 6) The LED filament lamp according to claim 6, wherein an end of a filament line of the plurality of filament lines is arranged at a same vertical position at the first connection end portion as a beginning of an adjacent filament line of the plurality of filament lines at the second connection end portion. ### Claim 8 (depends on 1) The LED filament lamp according to claim 1, wherein each filament line comprises an encapsulant covering the array of LEDs, the encapsulant comprising a luminescent material and/or a light scattering material. ### Claim 9 (depends on 1) The LED filament lamp according to claim 1, wherein the first connection end portion comprises a filament line free zone extending from beginnings of the plurality of filament lines and an end of the first connection end portion. ### Claim 10 (depends on 1) The LED filament lamp according to claim 1, wherein the second connection end portion comprises a filament line free zone extending from ends of the plurality of filament lines and an end of the second connection end portion. ### Claim 11 (depends on 1) The LED filament lamp according to claim 1, wherein the two-dimensional flexible PCB comprises at least four filaments lines. ### Claim 12 A method of producing a spiral LED filament, the method comprising: providing a two-dimensional flexible printed circuit board, PCB, having a first and a second opposing connection end portions, the two-dimensional flexible PCB comprises a plurality of filaments lines extending from the first connection end portion to the second connection end portion, wherein each filament line comprises an array of LEDs, and arranging the two-dimensional flexible PCB in a cylinder shape by mechanically connecting the first and the second opposing connection end portions such that each of the plurality of filament lines is connected to another one of the plurality of filament lines thereby forming the spiral LED filament. ### Claim 13 (depends on 12) The method according to claim 12, wherein the step of providing comprises: mechanically arranging the array of LEDs of the plurality of filaments lines on the two-dimensional flexible PCB, and electrically interconnecting the LEDs of each array of LEDs. ### Claim 14 (depends on 12) The method according to claim 12, wherein the step of providing further comprises: dispensing an encapsulant covering each LED of the array of LEDs. ### Claim 15 (depends on 12) The method according to claim 12, wherein connecting the first and the second opposing connection end portions comprises electrically connecting each of the plurality of filament lines to another one of the plurality of filament lines.