# US 10,872,718 B2 · Coil component > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,872,718 B2 - Document ID: US10872718B2 - Status: Granted - Kind: B2 - Application number: 16/028,717 - Filed: 2018-07-06 - Published: 2019-01-10 - Granted: 2020-12-22 - Earliest claimed: 2017-07-10 - Assignees: Murata Manufacturing Co., Ltd. - Applicants: Murata Manufacturing Co., Ltd. - Inventors: Morihiro Hamano; Keiichi Tsuduki; Kouhei Matsuura; Minoru Matsunaga - Web page: https://patentgrep.com/patent/US10872718B2 ## CPC - H01F 5/06: Insulation of windings - H01F 3/10: Composite arrangements of magnetic circuits - H01F 5/04: Arrangements of electric connections to coils, e.g. leads - H01F 17/0013: {with stacked layers} - H01F 17/0033: {with the coil helically wound around a magnetic core} - H01F 17/04: with magnetic core - H01F 27/32: Insulating of coils, windings, or parts thereof - H01F 27/292: {Surface mounted devices} - H01F: MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES ## Abstract A coil component includes a first magnetic body, an insulator stacked on the first magnetic body, a second magnetic body stacked on the insulator, a coil which is disposed in the insulator and which includes at least one coil conductor layer, and an internal magnetic body disposed within the inner circumference of the coil and connected to the first magnetic body and the second magnetic body. In a cross section in a stacking direction, the width of the internal magnetic body increases continuously from the first magnetic body side toward the second magnetic body side. Also, the inner circumferential surface of an end coil conductor layer located closest to the second magnetic body faces the outer circumferential surface of the internal magnetic body and is inclined in the same direction as the outer circumferential surface of the internal magnetic body with respect to the stacking direction. ## Claims ### Claim 1 A coil component comprising: a first magnetic body; an insulator stacked on the first magnetic body; a second magnetic body stacked on the insulator; a coil which is disposed in the insulator and includes at least one coil conductor layer; and an internal magnetic body which is disposed within an inner circumference of the coil in the insulator and is connected to the first magnetic body and the second magnetic body, wherein, in a cross section in a stacking direction of the first magnetic body, the insulator, and the second magnetic body, a width of the internal magnetic body increases continuously from the first magnetic body side toward the second magnetic body side, and an inner circumferential surface of an end coil conductor layer located closest to the second magnetic body, in the coil, faces an outer circumferential surface of the internal magnetic body and is inclined in a same direction as the outer circumferential surface of the internal magnetic body with respect to the stacking direction. ### Claim 2 (depends on 1) The coil component according to claim 1, wherein, in a cross section in the stacking direction, a shape of the end coil conductor layer is polygonal and has round vertices. ### Claim 3 (depends on 2) The coil component according to claim 2, wherein the shape of the end coil conductor layer is triangular and protrudes toward the second magnetic body. ### Claim 4 (depends on 3) The coil component according to claim 3, wherein the first magnetic body, the internal magnetic body, and the second magnetic body are composed of Ni—Cu—Zn-based ferrite, and the insulator is composed of glass containing borosilicate glass. ### Claim 5 (depends on 3) The coil component according to claim 3, wherein: an end surface of the internal magnetic body that faces the second magnetic body is circular and has a diameter of 200 μm or less, and in a cross section in the stacking direction, an angle formed by the end surface and the outer circumferential surface of the internal magnetic body is from 45 degrees to 70 degrees. ### Claim 6 (depends on 3) The coil component according to claim 3, wherein, in a cross section in the stacking direction, the inner circumferential surface of the end coil conductor layer is parallel to the outer circumferential surface of the internal magnetic body. ### Claim 7 (depends on 3) The coil component according to claim 3, wherein the first magnetic body has a recessed portion connected to the internal magnetic body. ### Claim 8 (depends on 3) The coil component according to claim 3, wherein a gap is present in at least part of an interface between the internal magnetic body and the insulator. ### Claim 9 (depends on 2) The coil component according to claim 2, wherein the first magnetic body, the internal magnetic body, and the second magnetic body are composed of Ni—Cu—Zn-based ferrite, and the insulator is composed of glass containing borosilicate glass. ### Claim 10 (depends on 2) The coil component according to claim 2, wherein: an end surface of the internal magnetic body that faces the second magnetic body is circular and has a diameter of 200 μm or less, and in a cross section in the stacking direction, an angle formed by the end surface and the outer circumferential surface of the internal magnetic body is from 45 degrees to 70 degrees. ### Claim 11 (depends on 2) The coil component according to claim 2, wherein, in a cross section in the stacking direction, the inner circumferential surface of the end coil conductor layer is parallel to the outer circumferential surface of the internal magnetic body. ### Claim 12 (depends on 2) The coil component according to claim 2, wherein the first magnetic body has a recessed portion connected to the internal magnetic body. ### Claim 13 (depends on 2) The coil component according to claim 2, wherein a gap is present in at least part of an interface between the internal magnetic body and the insulator. ### Claim 14 (depends on 2) The coil component according to claim 2, wherein, in a cross section in the stacking direction, a minimal distance between the inner circumferential surface of the end coil conductor layer and the outer circumferential surface of the internal magnetic body is 100 μm or more. ### Claim 15 (depends on 1) The coil component according to claim 1, wherein the first magnetic body, the internal magnetic body, and the second magnetic body are composed of Ni—Cu—Zn-based ferrite, and the insulator is composed of glass containing borosilicate glass. ### Claim 16 (depends on 1) The coil component according to claim 1, wherein: an end surface of the internal magnetic body that faces the second magnetic body is circular and has a diameter of 200 μm or less, and in a cross section in the stacking direction, an angle formed by the end surface and the outer circumferential surface of the internal magnetic body is from 45 degrees to 70 degrees. ### Claim 17 (depends on 1) The coil component according to claim 1, wherein, in a cross section in the stacking direction, the inner circumferential surface of the end coil conductor layer is parallel to the outer circumferential surface of the internal magnetic body. ### Claim 18 (depends on 1) The coil component according to claim 1, wherein the first magnetic body has a recessed portion connected to the internal magnetic body. ### Claim 19 (depends on 1) The coil component according to claim 1, wherein a gap is present in at least part of an interface between the internal magnetic body and the insulator. ### Claim 20 (depends on 1) The coil component according to claim 1, wherein, in a cross section in the stacking direction, a minimal distance between the inner circumferential surface of the end coil conductor layer and the outer circumferential surface of the internal magnetic body is 100 μm or more.