# US 2021/0280353 A1 · Coil component > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2021/0280353 A1 - Document ID: US20210280353A1 - Status: Published application - Kind: A1 - Application number: 17/189,835 - Filed: 2021-03-02 - Published: 2021-09-09 - Earliest claimed: 2020-03-06 - Assignees: TDK Corporation - Applicants: TDK Corporation - Inventors: Masaki ENDO; Tomonaga NISHIKAWA; Masaki YONEYAMA; Liyi CHEN; Azuma SATOH - Web page: https://patentgrep.com/patent/US20210280353A1 ## CPC - H01F 17/04: with magnetic core - H01F 27/2804: {Printed windings} - H01F 17/0013: {with stacked layers} - H01F 27/24: Magnetic cores - H01F 27/29: Terminals; Tapping arrangements {for signal inductances} - H01F 27/292: {Surface mounted devices} - H01F 27/2809: {on stacked layers} - H01F 2017/048: {with encapsulating core, e.g. made of resin and magnetic powder} - H01F: MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES ## Abstract Disclosed herein is a coil component that includes a a coil area in which first to third coil patterns are disposed and a terminal area positioned outside the coil area. The outer peripheral end of the first coil pattern is connected to the first terminal electrode. The inner peripheral end of the first coil pattern is connected to an inner peripheral end of the second coil pattern. The outer peripheral end of the second coil pattern is connected to an outer peripheral end of the third coil pattern. A via conductor connecting the outer peripheral ends of the second and third coil patterns is disposed at a position overlapping the terminal area. ## Claims ### Claim 1 A coil component comprising: a coil part having a structure in which a plurality of spirally wound coil patterns are axially stacked and connected in series; a first terminal electrode connected to one end of the coil part; a second terminal electrode connected to other end of the coil part; and a magnetic element body embedding therein the coil part, wherein the coil component has a coil area in which the coil part is disposed, a first terminal area positioned outside the coil area as viewed in an axial direction and the first terminal electrode being disposed, a second terminal area positioned outside the coil area as viewed in the axial direction and the second terminal electrode being disposed, an inner diameter area surrounded by the coil area and a part of the magnetic element body being disposed, and an outside area positioned outside the coil area as viewed in the axial direction and another part of the magnetic element body being disposed, wherein the plurality of coil patterns include at least first, second, and third coil patterns, wherein an outer peripheral end of the first coil pattern is connected to the first terminal electrode, wherein an inner peripheral end of the first coil pattern is connected to an inner peripheral end of the second coil pattern, wherein an outer peripheral end of the second coil pattern is connected to an outer peripheral end of the third coil pattern, and wherein a via conductor connecting the outer peripheral ends of the second and third coil patterns is disposed at a position overlapping the first terminal area or second terminal area. ### Claim 2 A coil component comprising: a coil part having a structure in which a plurality of spirally wound coil patterns are axially stacked and connected in series; a first terminal electrode connected to one end of the coil part; a second terminal electrode connected to other end of the coil part; and a magnetic element body embedding therein the coil part, wherein the coil component has a coil area in which the coil part is disposed, a first terminal area positioned outside the coil area as viewed in an axial direction and the first terminal electrode being disposed, a second terminal area positioned outside the coil area as viewed in the axial direction and the second terminal electrode being disposed, an inner diameter area surrounded by the coil area and a part of the magnetic element body being disposed, and an outside area positioned outside the coil area as viewed in the axial direction and another part of the magnetic element body being disposed, wherein the outside area includes a cut-away area positioned between the coil area and the first terminal area, wherein the plurality of coil patterns include at least first, second, and third coil patterns, wherein an outer peripheral end of the first coil pattern is connected to the first terminal electrode, wherein an inner peripheral end of the first coil pattern is connected to an inner peripheral end of the second coil pattern, wherein an outer peripheral end of the second coil pattern is connected to an outer peripheral end of the third coil pattern, and wherein a via conductor connecting the outer peripheral ends of the second and third coil patterns is disposed at a position overlapping the cut-away area. ### Claim 3 (depends on 1) The coil component as claimed in claim 1, wherein another via conductor connecting the inner peripheral ends of the first and second coil patterns is disposed so as to bite into the inner diameter area. ### Claim 4 (depends on 2) The coil component as claimed in claim 2, wherein another via conductor connecting the inner peripheral ends of the first and second coil patterns is disposed so as to bite into the inner diameter area. ### Claim 5 A coil component comprising: a first conductive layer including a first coil pattern and a first electrode pattern connected to an outer peripheral end of the first coil pattern; a second conductive layer including a second coil pattern and a second electrode pattern provided independently of the second coil pattern; a third conductive layer including a third coil pattern and a third electrode pattern provided independently of the third coil pattern; a first via conductor connected between an inner peripheral end of the first coil pattern and an inner peripheral end of the second coil pattern; and a second via conductor connected between an outer peripheral end of the second coil pattern and an outer peripheral end of the third coil pattern, wherein the first electrode pattern has a first region overlapping the second and third electrode patterns and a second region overlapping the second via conductor. ### Claim 6 (depends on 5) The coil component as claimed in claim 5, further comprising a magnetic member arranged so as to be surrounded by the first, second, and third coil patterns, wherein the magnetic member has a first protruding part arranged so as to be sandwiched between an innermost turn of the first coil pattern and the inner peripheral end of the first coil pattern. ### Claim 7 (depends on 6) The coil component as claimed in claim 6, wherein the magnetic member further has a second protruding part arranged so as to be sandwiched between an innermost turn of the second coil pattern and the inner peripheral end of the second coil pattern. ### Claim 8 (depends on 7) The coil component as claimed in claim 7, wherein the first and second protruding parts do not overlap each other. ### Claim 9 (depends on 8) The coil component as claimed in claim 8, wherein the magnetic member further has a third protruding part arranged so as to be sandwiched between an innermost turn of the third coil pattern and an inner peripheral end of the third coil pattern. ### Claim 10 (depends on 9) The coil component as claimed in claim 9, wherein the first and third protruding parts overlap each other.