# US 12,007,076 B2 · Light bulb > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,007,076 B2 - Document ID: US12007076B2 - Status: Granted - Kind: B2 - Application number: 17/924,225 - Filed: 2021-05-25 - Published: 2023-06-15 - Granted: 2024-06-11 - Earliest claimed: 2020-05-28 - Assignees: Signify Holding B.V. - Applicants: Signify Holding B.V. - Inventors: Michal Jan Horaczek - Web page: https://patentgrep.com/patent/US12007076B2 ## CPC - F21K 9/232: specially adapted for generating an essentially omnidirectional light distribution, e.g. with a glass bulb - F21K 9/237: Details of housings or cases, i.e. the parts between the light-generating element and the bases; Arrangement of components within housings or cases (F21K9/238 takes precedence) - F21K 9/90: Methods of manufacture - F21V 23/002: {Arrangements of cables or conductors inside a lighting device, e.g. means for guiding along parts of the housing or in a pivoting arm} - F21V 31/04: Provision of filling media - F21Y 2115/10: Light-emitting diodes [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 - 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 ## Abstract A light bulb (10) comprising a feedthrough body (26) for accommodating electrical conductors (24) through a glass stem (23) of the light bulb (10) is disclosed. The light bulb (10) comprises a light engine (21) arranged within a sealed light transmissive surface structure (22), a feedthrough body (26) sealed in and extending through the glass stem (23) supporting the light engine (21), a plurality of conductive wires (24) mutually electrically isolated from each other and extending through and gastightly sealed in the feedthrough body (26), the conductive wires (24) connecting the light engine (21) to at least one power and signal source. ## Claims ### Claim 1 A light bulb comprising: a light engine arranged within a space enclosed by a light transmissive surface structure and a glass stem; the glass stem comprising a mutually connected flare and tubular portion, the stem supporting the light engine and is fused by its flare to the light transmissive surface structure; a feedthrough body extending through the glass stem and being fixed by fusion in said tubular portion, wherein the feedthrough body is provided with a plurality of electrical conductors electrically isolated from each other which extend through the glass stem and connect said light engine to at least one power and signal source, wherein said feedthrough body is made of a ceramic, or a glass, and wherein the glass stem has a first melting point Tm1 and the feedthrough body has a second melting point Tm2, wherein Tm2-Tm1>=75° C. ### Claim 2 (depends on 1) The light bulb according to claim 1, wherein the space is gastightly sealed by the light transmissive surface structure and the glass stem; wherein the feedthrough body is sea lingly fixed over a sealing length in a gastight manner in said tubular portion, and wherein said electrical conductors extend in a gastight manner through the glass stem. ### Claim 3 (depends on 1) The light bulb according to claim 1, wherein said glass stem has a first coefficient of thermal eimension and the feedthrough body has a second coefficient of thermal expansion, wherein the first and second coefficient of thermal expansion differ by no more than |1*10-6/K|. ### Claim 4 (depends on 3) The light bulb according to claim 3, wherein said plurality of conductive wires are individually insulated with an insulation layer having a coefficient of thermal expansion matching the coefficient of thermal expansion of said conductive wires. ### Claim 5 (depends on 4) The light bulb according to claim 4, wherein said insulation layer is made of one of mylar and silicone. ### Claim 6 (depends on 1) The light bulb according to claim 1, wherein feedthrough body is a feedthrough tube, the electrical conductors are conductive wires which extend in a gastight manner through said feedthrough tube. ### Claim 7 (depends on 6) The light bulb according to claim 6, wherein said feedthrough tube is made of metal, ceramic or glass. ### Claim 8 (depends on 6) The light bulb according to claim 6, wherein said plurality of conductive wires are gastightly sealed in said feedthrough tube using an elastic and adhesive seal compound. ### Claim 9 (depends on 8) The light bulb according to claim 8, wherein said seal compound comprises one of glue and epoxy, preferably said seal compound comprises at least one of the group comprising epoxy resin, amorphous silica, titanium dioxide, non-fibrous aluminum oxide, oxybis(ethyleneoxy)bis(propylamine), butyl 2,3-epoxypropyl ether, bisphenol-A epichlorhydrin resin. ### Claim 10 (depends on 1) The light bulb according to claim 1, wherein the feedthrough body is a feedthrough carrier made of an electrically insulating material and electrical conductors are conductive tracks provided on a surface of the feedthrough carrier. ### Claim 11 (depends on 10) The light bulb according to claim 10, wherein said feedthrough carrier is made of a ceramic, or a glass and wherein the electrical conductors are conductive tracks provided on an outer surface of the feedthrough carrier. ### Claim 12 (depends on 10) The light bulb according to claim 10, wherein the tracks are made of copper or cermet material comprising alumina and/or aluminum nitride as a refractory oxide and aluminum, molybdenum and/or tungsten as a metal. ### Claim 13 (depends on 1) The light bulb according to claim 1, wherein the plurality of electrical conductors extending through the glass stem and connect said light engine to at least one power and signal source numbers at least four. ### Claim 14 (depends on 1) A method of manufacturing the light bulb in accordance with claim 1, comprising the steps of: I) fusing a feedthrough body in a tubular portion of a glass stem; II) providing the feedthrough body with a plurality of mutually electrically isolated electrical conductors; III) connecting said plurality of electrical conductors with light engine contacts supported by said glass stem; IV) arranging said light engine in a space enclosed by a light transmissive surface; and V) closing said space by assembling said glass stem and said light transmissive surface structure by fusion melting said light transmissive surface with a flare portion of the glass stem. ### Claim 15 (depends on 14) The method according to claim 14, wherein the space is gastightly sealed by the light transmissive surface structure and the glass-stem, the feedthrough body is sealingly fixed over a sealing length in a gastight manner in said tubular portion, and said electrical conductors extend in a gastight manner through the glass stem, the method further comprising a step of filling a gas to said space via the tubular portion before gastightly sealing said tubular portion. ### Claim 16 A light bulb comprising: a light engine arranged within a space enclosed by a light transmissive surface structure and a glass stem; the glass stem comprising a mutually connected flare and tubular portion, the stem supporting the light engine and is fused by its flare to the light transmissive surface structure; a feedthrough body extending through the glass stem and being fixed by melting the feedthrough body in said tubular portion, wherein the feedthrough body is provided with a plurality of electrical conductors electrically isolated from each other which extend through the glass stem and connect said light engine to at least one power and signal source, wherein said feedthrough carrier body is made of a ceramic, or a glass, and wherein the glass stem has a first melting point Tm1 and the feedthrough carrier has a second melting point Tm2, wherein Tm2-Tm1>=75° C.