JP2015103725A - Coil component and method of manufacturing coil component - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a coil component and a method of manufacturing the coil component capable of reducing a manufacturing cost by simplifying a manufacturing process.SOLUTION: A coil component includes: a sheet member 50 having a first region 51 which is composed of a flexible member formed in a sheet shape and in which a plurality of conductors 60 insulated from each other are arrayed on the surface and a second region 52 having magnetism; a core part which is formed by winding the second region 52 of the sheet member 50 therearound; and a coil part formed by electrically connecting ends of corresponding conductors 60 out of the plurality of conductors 60 to each other after continuously winding the first region 51 of the sheet member 50 around the outer peripheral side of the core part.

Description

  The present invention relates to a coil component and a method for manufacturing the coil component.

  In general, the coil component is manufactured by winding a conductive wire into a cylindrical shape a plurality of times. As other coil component manufacturing methods, methods shown in Patent Documents 1 and 2 are known. In this manufacturing method, first, a conductor is arranged in a predetermined pattern on a flexible and insulating film. And after winding this film, the helical coil components are formed by electrically connecting the ends of a plurality of conductors.

  By the way, a magnetic core may be used for the coil component in order to strengthen the generated magnetic flux. A coil component having a core can increase the magnetic flux density by increasing the inductance as compared with an air-core coil. Here, when using a core for the coil components of Patent Documents 1 and 2, it is conceivable to insert a magnetic core into the manufactured air-core coil or use a wound core as a magnetic material.

JP 2002-093649 A JP 2010-123883 A

  However, in order to have a core in any of the coil parts disclosed in Patent Documents 1 and 2, it is necessary to separately prepare a core formed of a magnetic material (a wound core in Patent Document 2). For this reason, in the manufacturing process of the coil component, a step of inserting the core into the coil component, a step of bonding a film on which conductive wires are arranged, and the like are required.

  This invention is made | formed in view of such a situation, and it aims at providing the manufacturing method of the coil components which can simplify a manufacturing process and can reduce manufacturing cost.

  A coil component according to claim 1 is made of a flexible member formed in a sheet shape, and includes a first region in which a plurality of conductors insulated from each other are arranged on a surface, and a second region having magnetism. After the sheet member having, the core part formed by winding the second region of the sheet member, and the first region of the sheet member continuously wound on the outer peripheral side of the core part, A coil portion formed by electrically connecting ends of the corresponding conductors among the plurality of conductors.

  According to such a configuration, the core portion can be formed by winding the second region of the sheet member. And a core part formation and winding of a coil part can be performed in series by the winding process of a sheet | seat member. Therefore, when manufacturing a coil component having a core, it is not necessary to separately prepare a core as in the prior art, and a mold and a manufacturing process for forming the core can be omitted. Therefore, the manufacturing process of the coil component having the core can be simplified and the manufacturing cost can be reduced.

  3. The coil component according to claim 2, wherein the second region of the sheet member is formed into a sheet shape by mixing magnetic powder with a material having flexibility and insulation.

  According to such a configuration, the magnetic bias in the second region of the sheet member can be reduced. Thereby, the core part formed by winding the 2nd area | region of a sheet | seat member can make it have uniform magnetism over the whole. Therefore, the function as a coil component can be improved.

  4. The coil component according to claim 3, wherein the first region and the second region of the sheet member are formed of the same material and have insulating properties and magnetism.

  According to such a configuration, the sheet member has flexibility, insulation, and magnetism in any part. Such a sheet member can be manufactured, for example, by forming a material in which a magnetic material is mixed with a resin or rubber having flexibility and insulating properties into a sheet shape. Therefore, when the first region and the second region are made of the same material, the manufacturing of the sheet member is simplified and the manufacturing cost can be reduced.

  5. The coil component according to claim 4, wherein the sheet member has a magnetic property of the second region higher than that of the first region.

  According to such a structure, since the core part is formed by winding the second region having higher magnetism than the first region in the sheet member, the magnetic flux density generated by increasing the inductance of the coil component can be increased. Therefore, since the outer diameter of the core part can be reduced, the coil component can be reduced in size.

  6. The coil component according to claim 5, wherein the first region of the sheet member is wound around the outer peripheral side of the core portion so that a part of the plurality of conductors overlaps in the circumferential direction, and the first region is In the state wound around the core portion, the end portion of the conductor on the outer peripheral side and the end portion of the conductor on the inner peripheral side are caulked.

  According to such a configuration, corresponding end portions of a plurality of conductors overlapping in the circumferential direction of the core portion can be reliably electrically connected. Further, the caulking portion that connects the end portions of the conductors suitably maintains the wound state of the sheet member against the elastic force that the wound sheet member tries to return to the original flat shape. be able to.

  A coil component according to a sixth aspect of the present invention is a toroidal coil in which both end surfaces of the core portion are in contact with each other or arranged at a predetermined interval, and the core portion and the coil portion are formed in an annular shape.

  The toroidal coil is formed by winding a conducting wire around an annular magnetic core. Therefore, the toroidal coil has a complicated conductor winding process in the manufacturing process as compared with the rod-shaped coil. Therefore, as in the present invention, a toroidal coil can be formed by generating a rod-shaped coil component using a flexible sheet member and then bending or bending the core portion of the coil component in an annular shape. It becomes possible. This eliminates the need for a step of winding a conducting wire around an annular magnetic core as in the prior art, thereby simplifying the manufacturing process and reducing the manufacturing cost.

  The coil part which concerns on Claim 7 WHEREIN: The edge part of said 2nd area | region which begins to be wound is formed thinner than another site | part.

  According to such a configuration, at the start of winding of the second region of the sheet member, the end portion can be wound without a gap or with a small gap. Thereby, the density of the sheet | seat member in the center part of a core part can be made high. Therefore, the outer diameter of the core portion can be reduced or the amount of the magnetic material can be reduced.

  9. The coil component according to claim 8, wherein the first region of the sheet member has an insulating property at least on a surface layer, and the plurality of conductors are insulated from each other by being provided on the surface layer at intervals. Yes.

  According to such a configuration, it is not necessary to provide an insulating film on the conductor, and insulation between a plurality of conductors can be ensured even if the portion other than the surface layer of the first region has conductivity. Thereby, even when a plurality of conductors do not have an insulating film, it is possible to prevent the conductors from being short-circuited.

  A manufacturing method of a coil component according to claim 9 is formed of a flexible member formed in a sheet shape, and a first region in which a plurality of conductors insulated from each other are arranged on a surface, and a second region having magnetism And a core part forming step of forming the core part by winding the second area of the sheet member using the sheet member, and the first area of the sheet member is continuously provided on the outer peripheral side of the core part. A coil part forming step of electrically connecting end portions of the corresponding conductors among the plurality of conductors to form a coil part.

  According to such a structure, it is set as the structure which forms a core part by winding the 2nd area | region of a sheet | seat member in a core part formation process. Thereby, there exists an effect similar to the invention which concerns on the coil components of Claim 1. Moreover, about the invention which concerns on the manufacturing method of the said coil component, it can apply similarly about the other characteristic part of the invention which concerns on a coil component. The effect in this case is the same as the effect in each feature.

It is a top view which shows the toroidal coil (coil component) in embodiment. It is an enlarged view of the II-II cross section in FIG. It is a top view of the sheet member in an embodiment. It is an enlarged view of the IV-IV cross section in FIG. It is a figure which shows the state by which the sheet | seat member was wound. It is an enlarged view of the section which shows signs that the end parts of a conductor were connected. It is a top view of the sheet member in the modification of an embodiment.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments in which a coil component and a manufacturing method of the coil component of the present invention are embodied will be described with reference to the drawings. In this embodiment, the coil component which comprises the toroidal coil by which the copper wire was wound around the cyclic | annular core is illustrated.

<Embodiment>
(Overall configuration of coil parts)
As shown in FIG. 1, the coil component 10 includes a core part 11 and a coil part 12. The core part 11 has magnetism and functions as the core of the coil component 10. The core portion 11 is a toroidal core formed in an annular shape in the present embodiment. As for the outer shape of the core portion 11, a closed magnetic circuit may be formed when a current is supplied to the coil portion 12, and a rectangular shape, an elliptical shape, or a configuration having a gap in part is appropriately set. . The coil portion 12 has conductivity and is wound around the core portion 11 at a predetermined pitch.

  As shown in FIG. 2, the coil component 10 includes a sheet member 50 made of a flexible member formed in a sheet shape. Although a detailed manufacturing method will be described later, in the coil component 10, the sheet member 50 is wound to form the rod-shaped core portion 11 and the coil portion 12, and then the core portion 11 and the coil portion 12 are bent or bent. An annular toroidal coil is formed.

  In the present embodiment, the sheet member 50 is formed of a material such as an insulating and flexible rubber material or resin material. Specifically, examples of the rubber material used for the sheet member 50 include hydrogenated acrylonitrile butadiene rubber (H-NBR), acrylonitrile butadiene rubber (NBR), acrylic rubber (ACM), and fluorine rubber (FKM). Examples of the resin material used for the sheet member 50 include polyimide, polyethersulfone, epoxy resin, polyethylene terephthalate, and polytetrafluoroethylene.

  The sheet member 50 is formed in a sheet shape by mixing a magnetic powder with a flexible and insulating material. This magnetic powder is for giving magnetism to a portion to be the core portion 11 in the sheet member 50. Specifically, examples of the raw material of the magnetic powder used for the sheet member 50 include iron (Fe), ferrosilicon (Fe—Si), sendust, ferrite, and amorphous. Moreover, as a magnetic material, from the viewpoint of constituting the core portion 11, a soft magnetic material is more preferable among the ferromagnetic materials.

  In the unfolded state, the sheet member 50 includes a first region 51 and a second region 52 as shown in FIGS. 3 and 4. In the present embodiment, the first region 51 and the second region 52 of the sheet member 50 are formed of the same material. Thereby, the sheet member 50 has flexibility, insulation, and magnetism in any region. A plurality of conductors 60 insulated from each other are arranged on the surface of the first region 51. In the present embodiment, the plurality of conductors 60 are arranged at intervals in the first region 51 of the sheet member 50 having insulation properties. Thus, the plurality of conductors 60 are insulated from each other.

  The second region 52 has magnetism due to the magnetic powder mixed with the sheet member 50. The end that starts to be wound when the core portion 11 of the second region 52 is formed, that is, the end opposite to the boundary with the first region 51 (the lower side in FIG. 3, the right side in FIG. 4) is the other end. It is formed thinner than this part. The purpose of this is to facilitate the winding process of the sheet member 50 and to improve the density in the central part of the core part 11 to be formed. In the second region 52, an inclined surface 52a is formed so that the thickness of the sheet member 50 gradually decreases toward the end portion.

  The plurality of conductors 60 are formed of a conductive material. Specifically, copper, aluminum, gold, silver, etc. are mentioned as a conductor material used for the conductor 60. The plurality of conductors 60 are formed so as to extend from the end portion side (the upper side in FIG. 3) of the first region 51 toward the boundary side (the lower side in FIG. 3) between the first region 51 and the second region 52. ing. The plurality of conductors 60 form a predetermined angle with respect to the winding direction of the sheet member 50 (the vertical direction in FIG. 3) and are regularly arranged at a predetermined pitch.

  Further, as shown in FIG. 5, the plurality of conductors 60 are electrically connected at corresponding ends in a state where the sheet member 50 is wound up to the end of the first region 51. Thus, the plurality of conductors 60 constitute a continuous spiral coil portion 12. In addition, “corresponding end portions” of the plurality of conductors 60 are end portions to be electrically connected in order to form the coil portion 12. In the present embodiment, the adjacent conductors 60 are ends located at the same position in the width direction of the sheet member 50 (left-right direction in FIG. 5).

  Various methods are conceivable as a method of electrically connecting the plurality of conductors 60. For example, in the present embodiment, a method of connecting the ends of the conductor 60 by caulking is employed. Specifically, first, the first region 51 is wound around the outer peripheral side of the core portion 11 so that some of the plurality of conductors 60 overlap in the circumferential direction. Next, in a state where the sheet member 50 is wound around the core portion 11, the end portion of the conductor 60 positioned on the outer peripheral side is plastically deformed toward the inner peripheral side. Thereby, the edge part located in the outer peripheral side and the edge part of an inner peripheral side are crimped, and edge parts are electrically connected.

(Manufacturing method of coil parts)
A method for manufacturing the coil component 10 will be described. The coil component 10 is configured by winding the sheet member 50 as described above. The sheet member 50 is formed, for example, by extending a slurry in which a soft magnetic powder is mixed with a flexible and insulating material into a sheet shape. At this time, an inclined surface 52a is formed on the lower surface of one side of the periphery of the sheet member 50 such that the thickness of the sheet member 50 gradually decreases toward the end (see FIG. 4).

  Next, the sheet member 50 is formed with a plurality of pilot holes 51a (see FIGS. 3 and 4) at equal intervals along one side of the peripheral edge facing one side where the inclined surface 52a is formed. Subsequently, the plurality of conductors 60 are arranged on the surface of the sheet member 50. One end of the conductor 60 is disposed so as to cover the prepared hole 51 a of the sheet member 50. In addition, the other end of the conductor 60 is disposed at the same position as one end of the adjacent conductor 60 in the width direction of the sheet member 50. The plurality of conductors 60 are formed by, for example, a screen printing method, a method of chemical etching after patterning by photolithography, or a method of shot coating conductive particles.

  After arranging the plurality of conductors 60, a through hole 51 b that penetrates the sheet member 50 and the other end of the conductor 60 is formed. The through hole 51 b is located at the same position in the width direction of the sheet member 50 as the prepared hole 51 a covered with one end of the conductor 60. In this way, the sheet member 50 constituting the coil component 10 is formed. Here, a rectangular area in which a plurality of conductors 60 are arranged on the surface of the sheet member 50 is a first area 51, and an area excluding the first area 51 is a second area 52.

  The thickness and the winding direction length of the second region 52 of the sheet member 50 are set so that the second region 52 can be wound over at least one turn. In the present embodiment, the thickness (including the thickness of the inclined surface 52a) and the winding direction length are set so that the winding can be performed about three times. In addition, the thickness and the winding direction length of the first region 51 of the sheet member 50 are set so that the first region 51 can be wound around the outer periphery of the wound second region 52 over one or more rounds. In the present embodiment, the thickness and the length in the winding direction are set in consideration of the length for one week and the overlap for connecting the conductors.

  Subsequently, the process proceeds to a manufacturing process of the coil component 10 using the sheet member 50 described above. First, in the core part forming step, the core part 11 is formed by winding the second region 52 of the sheet member 50 over a plurality of circumferences. Specifically, when the winding starts from the end of the second region 52 where the inclined surface 52a is formed, and the winding is performed by the length in the winding direction of the second region 52, the sheet member 50 extends over a predetermined circumference. It is wound. Thereby, the core part 11 whose cross-sectional area orthogonal to the central axis of winding becomes a predetermined area is formed. The core part 11 has magnetism by the magnetic powder contained in the second region 52 and functions as a core.

  Next, in the coil part forming step, as shown in FIG. 5, after the first region 51 of the sheet member 50 is continuously wound around the outer peripheral side of the core part 11, the corresponding ends of the plurality of conductors 60 are connected to each other. Are electrically connected to form the coil portion 12. Specifically, the first region 51 that is integral with the second region 52 that constitutes the core portion 11 is wound around the outer peripheral side of the core portion 11 so that some of the plurality of conductors 60 overlap in the circumferential direction. . At this time, since the circumferential length of the core part 11 and the winding direction length of the first region 51 are defined in advance, the prepared hole 51a and the through hole 51b formed in the first region 51 are in communication with each other. .

  Then, an external force is applied in the direction indicated by the thick arrow in FIG. 6 to plastically deform the end portion of the conductor 60 located on the outer peripheral side toward the inner peripheral side. If it does so, the edge part of the conductor 60 will be pushed in to the through-hole 51b, contacting the edge part of the conductor located in an inner peripheral side. In this way, corresponding ends of the conductor 60 are caulked and electrically connected. Further, when all the corresponding end portions of the plurality of conductors 60 are caulked in the same manner, a continuous spiral coil portion 12 is formed. Further, the caulking portion that connects the ends of the conductor 60 maintains the wound state of the sheet member 50 against the elastic force that the wound sheet member 50 tries to return to the original flat shape. doing.

  Finally, in the toroidal coil generation step, the core portion 11 and the coil portion 12 are bent to generate a toroidal coil. Specifically, both end surfaces of the core portion 11 formed in a rod shape are arranged in contact with each other at a predetermined interval, and the core portion 11 and the coil portion 12 are formed in an annular shape to generate a toroidal coil. In this embodiment, the both ends of the core part 11 are made to contact so that a toroidal core may not have a gap. Through such a process, the coil component 10 constitutes a toroidal coil having an annular shape as shown in FIG.

(Effects of the configuration of the embodiment)
According to the coil component 10 and the manufacturing method of the coil component 10 described above, the core portion 11 can be formed by winding the second region 52 of the sheet member 50. And the formation of the core part 11 and the winding of the coil part 12 can be performed in series by the winding process of the sheet member 50. Therefore, when manufacturing the coil component 10 having a core, it is not necessary to separately prepare a core as in the conventional case, and a mold and a manufacturing process for forming the core can be omitted. Therefore, it is possible to simplify the manufacturing process of the coil component 10 having the core and reduce the manufacturing cost.

  Further, the sheet member 50 is configured such that the first region 51 and the second region 52 are formed of the same material. That is, the sheet member 50 has flexibility, insulation, and magnetism in any part. Thereby, in this embodiment, the insulation required for the first region 51, the magnetism required for the second region 52, and the flexibility required for the entire region can be provided. In addition, since the first region 51 and the second region 52 are made of the same material, the manufacturing of the sheet member 50 is simplified, and the manufacturing cost can be reduced.

  In the present embodiment, a caulking method is adopted as a method of electrically connecting corresponding end portions of the plurality of conductors 60. According to such a configuration, corresponding end portions of the plurality of conductors 60 overlapping in the circumferential direction of the core portion 11 can be reliably electrically connected. Further, the caulking portion that connects the ends of the conductor 60 suitably resists the force of the wound sheet member 50 to return to the original planar shape, in a state where the sheet member 50 is wound. Can be maintained.

  Moreover, the coil component 10 shall be curved cyclically | annularly and shall comprise a toroidal coil. Conventionally, this toroidal coil is formed by winding a conducting wire around an annular magnetic core (toroidal core). Therefore, the toroidal coil has a complicated conductor winding process in the manufacturing process as compared with the rod-shaped coil. On the other hand, in this embodiment, after producing | generating the rod-shaped coil component 10 using the sheet | seat member 50 which has flexibility, by curving the core part 11 of the said coil component 10 cyclically | annularly, a toroidal coil is made. Configure. This eliminates the need for a step of winding a conducting wire around an annular magnetic core as in the prior art, thereby simplifying the manufacturing process and reducing the manufacturing cost.

  The second region 52 of the sheet member 50 has an inclined surface 52a in which an end that starts to be wound when forming the core portion 11 is formed thinner than other portions. According to such a configuration, at the start of winding of the second region 52 of the sheet member 50, the end portion can be wound without a gap or with a small gap. Thereby, since the density of the sheet | seat member 50 in the center part of the core part 11 can be made high, the function as the core part 11 can be improved.

  In the present embodiment, the sheet member 50 is formed into a sheet shape by mixing a magnetic powder with a flexible and insulating material. According to such a configuration, the magnetic bias in the second region 52 of the sheet member 50 can be reduced. Thereby, the core part 11 formed by winding the 2nd area | region 52 of the sheet | seat member 50 can have a uniform magnetism over the whole. Therefore, the function as the coil component 10 can be improved.

  Moreover, the 1st area | region 51 of the sheet | seat member 50 has insulation over the whole region including a surface layer. The plurality of conductors 60 are configured to be insulated from each other by being provided on the surface layer of the first region 51 at intervals. Thereby, it is not necessary to provide an insulating film on the conductor 60, and it is possible to ensure the insulation between the plurality of conductors 60 even if the portion other than the surface layer of the first region 51 has conductivity. Thereby, even when the several conductor 60 does not have an insulating film, it can prevent the conductor 60 short-circuiting.

<Modification of Embodiment>
In the embodiment, the sheet member 50 is configured such that the first region 51 and the second region 52 are formed of the same material. On the other hand, the sheet member 50 may be formed of a different material according to characteristics required for each region.

  Specifically, since the second region 52 forms the core portion 11 by being wound, it is required to have magnetism. In addition, the second region 52 is preferably not electrically conductive in consideration of loss due to eddy current, but is not necessarily required to have insulation. Therefore, the sheet member 50 may be configured such that the magnetism of the second region 52 is higher than the magnetism of the first region 51. For example, the sheet member 50 having different magnetism in the first region 51 and the second region 52 can be obtained by forming the sheet member 50 using two types of slurry having different magnetic powder contents.

  Further, the first region 51 of the sheet member 50 needs to be insulated from each other by the plurality of conductors 60 arranged on the surface. Therefore, the first region 51 is required to have an insulating property at least on the surface layer when the conductor 60 is not insulated by an insulating film or the like. Therefore, only the surface layer of the first region 51 may have an insulating property by a configuration in which an insulating film is disposed on the surface layer of the first region 51. Thereby, even if it is a case where the material which has electroconductivity is used for magnetic powder, the mutual insulation of the some conductor 60 can be ensured reliably irrespective of the content.

  Moreover, the coil component 10 shall be wound so that a cross-sectional shape may become circular as shown in FIG. 2 in the winding process (core part formation process, coil part formation process) of the sheet | seat member 50. As shown in FIG. In addition, in the said winding process, you may wind so that the cross-sectional shape of the coil component 10 may make a rectangular shape or an ellipse shape. In particular, when the coil component 10 constitutes a toroidal coil as in the embodiment, it is also preferable to select a rectangular shape having a large cross-sectional aspect ratio so that the difference between the inner diameter and the outer diameter becomes small.

  In the embodiment, the plurality of conductors 60 are configured such that corresponding end portions are electrically connected by caulking. As a method of connecting the end portions of the conductor 60, pinning or soldering may be used. Specifically, first, the end of the conductor 60 is provided so as to protrude from the end of the sheet member 50. And after winding the 1st area | region 51 of the sheet | seat member 50, as shown in FIG. 7, the protrusion part 161 of the conductor 60 and the edge part of the conductor 60 of an inner peripheral side are made into the copper pin 170 which has electroconductivity. Fasten or connect with solder. According to such a configuration, the same effects as in the embodiment can be obtained. Further, by appropriately setting the protruding amount of the protruding portion 161 of the conductor 60, an error in the circumferential length in the winding process of the sheet member 50 can be allowed, and corresponding ends of the plurality of conductors 60 can be connected to each other. .

  Further, the thickness and the length in the winding direction of the sheet member 50 are appropriately set based on the magnetism and the cross-sectional area of the core portion 11. The second region 52 of the sheet member 50 only needs to have a length that can be wound over at least one turn, and is set based on the relationship between the magnetism and thickness of the core 11 to be generated. In the present embodiment, the inclined surface 52a is provided in the second region 52 of the sheet member 50. However, when the hollow portion is provided in the center of the core portion 11, the inclined surface 52a may not be provided. . Further, an inclined surface may be provided at the end of winding in the first region 51 to reduce the step in the final circumference. The first region 51 is set based on the peripheral length of the core part 11, the connection method of the conductors 60, and the like.

  Further, the sheet member 50 has a configuration in which magnetic powder is mixed with a flexible material in order to give the second region 52 magnetism. As a method for imparting magnetism to the second region 52 by mixing magnetic materials, it is conceivable to mix granular, rod-like, or fibrous magnetic materials when the sheet member 50 is formed. However, in the core portion 11 formed by the second region 52, it is preferable to mix magnetic powder from the viewpoint of reducing the magnetic bias.

  In the embodiment, the first region 51 is insulative and the plurality of conductors 60 are spaced apart from each other so that the plurality of conductors 60 are insulated from each other on the surface of the first region 51. did. On the other hand, an insulating film may be provided on the conductor 60. As a result, it is possible to arrange adjacent conductors 60 in contact with each other, or to employ a sheet member 50 having no insulating properties.

10: Coil parts 11: Core part 12: Coil part 50: Sheet member 51: First region 51a: Pilot hole 51b: Through hole 52: Second region 52a: Inclined surface 60: Conductor 161: Protrusion Part 170: Copper pin

Claims (9)

A sheet member made of a flexible member formed in a sheet shape and having a first region in which a plurality of conductors insulated from each other are arranged on the surface, and a second region having magnetism;
A core part formed by winding the second region of the sheet member;
A coil formed by electrically connecting ends of the corresponding conductors among the plurality of conductors after the first region of the sheet member is continuously wound around the outer peripheral side of the core portion. And
Coil parts comprising   The coil component according to claim 1, wherein the second region of the sheet member is formed into a sheet shape by mixing a magnetic powder with a material having flexibility and insulation.   The coil component according to claim 2, wherein the first region and the second region of the sheet member are formed of the same material and have insulating properties and magnetism.   The coil component according to claim 1, wherein the sheet member has a magnetism in the second region higher than that in the first region. The first region of the sheet member is wound so that a part of the plurality of conductors overlaps the outer peripheral side of the core portion in the circumferential direction,
The coil according to any one of claims 1 to 4, wherein an end portion of the conductor on the outer peripheral side and an end portion of the conductor on the inner peripheral side are caulked in a state where the first region is wound around the core portion. parts.   6. The coil component according to claim 1, wherein the core part is a toroidal coil in which both end surfaces of the core part are arranged in contact with each other or at a predetermined interval, and the core part and the coil part are formed in an annular shape. .   The coil component according to any one of claims 1 to 6, wherein an end portion of the second region that starts to be wound is formed thinner than other portions. The first region of the sheet member has an insulating property at least on the surface layer,
The coil component according to claim 1, wherein the plurality of conductors are insulated from each other by being provided on the surface layer at intervals. Using a sheet member comprising a first region in which a plurality of conductors insulated from each other are arranged on the surface, and a second region having magnetism, which is made of a flexible member formed in a sheet shape,
A core part forming step of winding the second region of the sheet member to form a core part;
After the first region of the sheet member is continuously wound around the outer peripheral side of the core portion, the coil portions are formed by electrically connecting the corresponding ends of the conductors among the plurality of conductors. A coil portion forming step;
A method for manufacturing a coil component comprising:

Images