# US 12,119,154 B2 · Coil device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,119,154 B2 - Document ID: US12119154B2 - Status: Granted - Kind: B2 - Application number: 17/209,761 - Filed: 2021-03-23 - Published: 2021-09-30 - Granted: 2024-10-15 - Earliest claimed: 2020-03-24 - Assignees: TDK Corporation; TDK Korea Corporation - Applicants: TDK Corporation; TDK Korea Corporation - Inventors: Kiyofumi Fujiwara; Hiroyuki Iwata; Eietsu Abe; Sepung Ki; Chihu An - Web page: https://patentgrep.com/patent/US12119154B2 ## CPC - H01F 17/045: {with core of cylindric geometry and coil wound along its longitudinal axis, i.e. rod or drum core} - H01F 27/2823: {Wires (H01F27/2866 takes precedence)} - H01F 27/292: {Surface mounted devices} - H01F 41/069: Winding two or more wires, e.g. bifilar winding - 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 The present invention provides a coil device which includes two coil elements in the same device and achieves an improved wire occupancy. The coil device includes a core including a winding core, and a winding wire part of which a first wire and a second wire are wound in a plurality of layers around the winding core, wherein the winding wire part includes a first part in which the first wire and the second wire of a same turn are wound adjacent to each other on a same layer, and a second part in which the first wire and the second wire of a same turn are wound in different layers without being adjacent to each other. ## Claims ### Claim 1 A coil device comprising a core including a winding core, and a winding wire part of which a first wire and a second wire are wound in a plurality of layers around the winding core, wherein the winding wire part includes a first part in which the first wire and the second wire of a same turn are wound adjacent to each other on a same layer, a second part in which the first wire and the second wire of a same turn are wound in different layers without being adjacent to each other, and a third part in which the first wire and the second wire of a same turn are would in a same layer without being adjacent to each other, and an inner most layer of the winding wire part contacting the winding core consists of the first part. ### Claim 2 (depends on 1) The coil device according to claim 1, wherein the winding wire part includes a fourth part in which the first wire and the second wire of a same turn are wound adjacent to each other on different layers. ### Claim 3 (depends on 1) The coil device according to claim 1, wherein, in the second part, one wire of the first wire and the second wire wound in an outer layer is positioned closer to a center of the winding core in a coil axis direction than the other wire among the first wire and the second wire in an inner layer closer to the winding core than the outer layer. ### Claim 4 (depends on 1) The coil device according to claim 1, wherein a final turn of the first wire and a final turn of the second wire of the winding wire part are positioned closer to a winding core second end which is one end of the winding core in a coil axis direction than a winding core first end which is other end of the winding core in the coil axis direction; and an end of the first wire and an end of the second wire extending from the winding wire part are pulled out to the winding core first end. ### Claim 5 (depends on 4) The coil device according to claim 4, wherein the final turn of the first wire and the final turn of the second wire are included in the first part. ### Claim 6 (depends on 1) The coil device according to claim 1, wherein the winding wire part includes a second turn of the first wire which is wound after a first turn of the first wire included in the first part and wound in a second layer closer to the winding core than a first layer included in the first turn of the first wire, and a second turn of the second wire which is wound after a first turn of the second wire being the same turn as the first turn of the first wire in which the second turn of the second wire is wound to the same turn as the second turn of the first wire in a second layer. ### Claim 7 (depends on 6) The coil device according to claim 6, wherein the first turn of the first wire is positioned closer to a center of the winding core in the coil axis direction than the second turn of the first wire, and the first turn of the second wire is positioned closer to the center of the winding core in the coil axis direction than the second turn of the second wire. ### Claim 8 (depends on 1) The coil device according to claim 1, wherein at least one of a third turn furthest away from the winding core among the first wire and a fourth turn furthest away from the winding core among the second wire intercept with a line passing through a center of the winding core in the coil axis direction and perpendicularly to the coil axis direction. ### Claim 9 (depends on 1) The coil device according to claim 1, wherein the winding core includes a center outer circumference face positioned at a center of the coil axis direction of the winding core and extending in the coil axis direction, and a corner end curve extending from the center outer circumference face to a winding core first end which is one end of the winding core in the coil axis direction and also extending from the center outer circumference face to a winding core second end which is the other end of the winding core in the coil axis direction, in which the corner end curve has a smaller curvature than a curvature of a cross section of the first wire and the second wire perpendicular to a wire extending direction of the first wire and the second wire. ### Claim 10 (depends on 1) The coil device according to claim 1, wherein the core includes a first flange connecting to a winding core first end which is one end of the winding core in the coil axis direction, and a second flange connecting to a winding core second end which is the other end of the winding core in the coil axis direction. ### Claim 11 (depends on 10) The coil device according to claim 10, wherein one wire wound in an outer layer of the same turn among the first wire and the second wire of the second part is separated from the first flange and the second flange, and the other wire wound in an layer towards inner side closer to the winding core than the outer layer of the same turn among the first wire and the second wire is connected to the first flange or the second flange. ### Claim 12 (depends on 10) The coil device according to claim 10, wherein the first flange is provided with a first electrode, a second electrode, a third electrode, and a fourth electrode which are insulated against each other, in which the first electrode and the third electrode connected with the first wire are positioned across one diagonal line of the first flange, and the second electrode and the fourth electrode connected with the second wire are positioned across the other diagonal line of the first flange.