# US 12,119,166 B2 · Method for manufacturing an electronic component > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,119,166 B2 - Document ID: US12119166B2 - Status: Granted - Kind: B2 - Application number: 16/864,493 - Filed: 2020-05-01 - Published: 2020-08-13 - Granted: 2024-10-15 - Earliest claimed: 2016-03-24 - Assignees: Taiyo Yuden Co., Ltd. - Applicants: Taiyo Yuden Co., Ltd. - Inventors: Tsuyoshi Ogino; Takayuki Sekiguchi; Koji Otsuka - Web page: https://patentgrep.com/patent/US12119166B2 ## CPC - H01F 27/32: Insulating of coils, windings, or parts thereof - H01F 17/0013: {with stacked layers} - H01F 27/022: {Encapsulation} - H01F 27/28: Coils; Windings; Conductive connections - H01F 27/292: {Surface mounted devices} - H01F 41/04: for manufacturing coils {(coils for transformer or inductances H01F27/28)} - H01F 2017/0026: {Multilayer LC-filter} - H01F 2017/004: {with the coil helically wound around an axis without a core} - H01F: MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES ## Abstract A method for manufacturing an electronic component comprises a step of forming an intermediate body including an insulator containing a resin and a conductive main body provided inside the insulator. The method further includes a step of forming an external electrode provided on the intermediate body and electrically coupled to the conductive main body. The method further includes a step of oxidizing the conductive main body, after forming the intermediate body including the insulator and the main body provided inside the insulator, to form an outer coating film on at least a part of a peripheral surface of the conductive main body. ## Claims ### Claim 1 A method for manufacturing a coil component comprising: a step of forming an intermediate body including an insulator containing a resin and a coil conductor provided inside the insulator; a step of forming an external electrode provided on the intermediate body and electrically coupled to the coil conductor; and a step of thermally oxidizing the coil conductor, after forming the intermediate body including the insulator and the coil conductor provided inside the insulator, to form an outer coating film on at least a part of a peripheral surface of the coil conductor. ### Claim 2 (depends on 1) The method for manufacturing the coil component according to claim 1, wherein the thermal oxidization is performed at between 100° C. to 250° C. ### Claim 3 (depends on 1) The method for manufacturing the coil component according to claim 1, wherein the thermal oxidization is performed in air. ### Claim 4 (depends on 1) The method for manufacturing the coil component according to claim 1, wherein the outer coating film has a resistivity higher than the coil conductor. ### Claim 5 (depends on 1) The method for manufacturing the coil component according to claim 1, wherein the coil conductor contains at least one metal; and wherein the outer coating film is made of an oxide of at least one of said at least one metal. ### Claim 6 (depends on 1) The method for manufacturing the coil component according to claim 1, wherein the step of forming the intermediate body comprises a step of forming the coil conductor and a step of forming the insulator. ### Claim 7 (depends on 6) The method for manufacturing the coil component according to claim 6, wherein the step of forming the coil conductor comprises a step of forming a plurality of pillared conductive members that extend in one axial direction and a step of forming a plurality of connecting conductive members each of which couples two of the plurality of pillared conductive members. ### Claim 8 (depends on 7) The method for manufacturing the coil component according to claim 7, wherein the plurality of pillared conductive members and the plurality of connecting conductive members form a coil portion wound around an axis perpendicular to the one axial direction. ### Claim 9 (depends on 7) The method for manufacturing the coil component according to claim 7, wherein the step of forming the insulator comprises a step of forming a first insulating layer having a bonding surface perpendicular to the one axial direction and a step of forming a second insulating layer bonded to the bonding surface; and wherein the step of forming a plurality of pillared conductive members comprises a step of forming a first via conductive member in the first insulating layer and a step of forming a second via conductive member in the second insulating layer and bonded to the first via conductive member. ### Claim 10 (depends on 9) The method for manufacturing the coil component according to claim 9, wherein the step of forming the coil conductor further comprises a step of forming a contact between the first via conductive member and the second via conductive member. ### Claim 11 (depends on 10) The method for manufacturing the coil an electronic component according to claim 10, wherein the coil conductor is formed of a first conductive material; and wherein the contact is formed of a second conductive material different from the first conductive material. ### Claim 12 (depends on 11) The method for manufacturing the coil component according to claim 11, wherein the contact is formed of a metallic material containing titanium or chromium. ### Claim 13 (depends on 9) The method for manufacturing the coil component according to claim 9, wherein the first and second via conductive members are made of a metallic material containing copper, silver or nickel. ### Claim 14 (depends on 1) The method for manufacturing the coil component according to claim 1, wherein the coil conductor includes a plurality of windings, and wherein the plurality of windings form a coil portion that is wound around one axial direction. ### Claim 15 (depends on 1) The method for manufacturing the coil component according to claim 1, wherein the insulator further containing ceramic particles. ### Claim 16 (depends on 1) The method for manufacturing the coil component according to claim 1, wherein the coil conductor comprise at least one metal; and the outer coating film may be formed of an oxide of a metallic material other than the at least one metal that forms the coil conductor. ### Claim 17 (depends on 1) The method for manufacturing the coil component according to claim 1, wherein the coil conductor comprises a Cu plating layer and the outer coating film is made of copper oxide.