JP2007173576A - Coil and method of manufacturing same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a coil in which its direction can be easily recognized and a resin can be easily injected, and to provide a method of manufacturing the same. <P>SOLUTION: A core 2 is configured so that it has a winding core and first and second flanges 4, 5, a winding wire accommodating region 2A is defined by the winding core, the first and second flanges 4, 5, a terminal electrode 7 is provided on the second flange 5, and the winding wire 6 to be connected to the terminal electrode is wound around the winding core. The coil is manufactured through a resin immersion process in which first circumferential surfaces 45, 55 as one part of the external circumferential surface of the core 2 are immersed in a resin liquid bath W to form a resin coating 8, on the winding of the winding wire 6 in the winding wire accommodating region 2A by a capillarity, and a marking 8A is formed on the third circumferential surfaces 45, 55 with the resin in the resin liquid bath. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

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

  Conventionally, there is a coil component configured by winding a winding around a core having a winding core portion and a pair of flange portions, and Patent Document 1 protects a portion where the winding is wound with an insulating resin. Techniques to do this are disclosed. In this coil component, a resin coating is formed by, for example, injecting a liquid resin into a winding portion.

Further, the coil component includes a terminal electrode portion to which one end and the other end of the winding are connected. The terminal electrode portion is disposed on the mounting surface side of the coil component, and is electrically connected to an electrode formed in advance on the substrate when the coil component is mounted on the substrate. Therefore, in order to bring the terminal electrode portion and the electrode into contact with each other accurately, the coil component needs to be mounted on the substrate at the correct position and in the correct direction.
Japanese Patent Laid-Open No. 7-302719

  With the development of technology, electronic devices using coil components, such as mobile phones, have been improved in performance and size, and there is a demand for miniaturization and high-density mounting even when placed on coil components. In order to cope with this, a coil component having a core size of about several mm is manufactured. However, as the core is reduced, the winding location of the winding is also reduced, and the workability of filling the winding location with the resin is reduced.

  In addition, when the coil component is mounted on the substrate, the visibility deteriorates as the size of the coil component is reduced, and thus the coil component may be misplaced. Although the correct orientation of the coil component can be recognized by changing the shape of the core or marking the core, etc., there is a risk of causing a change in shape and deterioration of workability for attaching the mark. It was.

  Then, an object of this invention is to provide the manufacturing method of the coil component which can identify | isolate direction easily, and can inject resin easily.

  In order to solve the above-described problems, the present invention has a winding core portion and a pair of flange portions having outer peripheral surfaces provided at both ends of the winding core portion, and the winding is accommodated by the winding core portion and the pair of flange portions. A core defining the region, a terminal electrode portion provided on at least one of the pair of flanges, a winding wound around the core portion and connected to the terminal electrode portion, and a winding in the winding accommodating region Provided is a coil component having an insulating resin layer that covers a winding portion of a wire and a mark portion that is attached to a part of the outer peripheral surface of a pair of flanges and is made of the same material as the insulating resin.

  According to such a configuration, since the insulating resin serving as the mark portion is arranged on the outer peripheral portion of the core, by defining the position of the mark portion in advance, it is possible to determine which of the terminal electrode portions on the core direction, for example, the mounting surface. It can be easily determined whether they are aligned in the direction. Further, since the mark portion is made of the same material as the insulating resin, the mark portion can be formed at the same time when the insulating resin layer is formed, and the assembling work of the coil component can be simplified.

  In the coil component having the above configuration, a part of the terminal electrode portion is formed on the outer peripheral surface of the pair of flanges, the winding is connected to the terminal electrode portion at the outer peripheral surface position, and the mark portion is the winding It is preferable that it adheres to the connecting part.

  According to such a configuration, the connecting portion can be covered with the insulating resin layer. Therefore, it is suppressed that a short circuit generate | occur | produces in the connection part. Therefore, for example, even if the connecting portions abut on adjacent coil components, the occurrence of a short circuit is suppressed, so that the coil components can be mounted with high density.

  In order to solve the above problem, the present invention has a winding core portion and a pair of flange portions having outer peripheral surfaces provided at both ends of the winding core portion, and a winding accommodating region is formed by the winding core portion and the pair of flange portions. To manufacture a coil component comprising a core to be defined, a terminal electrode portion provided on at least one of a pair of flange portions, and a winding wound around a core portion and connected to the terminal electrode portion A winding process in which the winding is wound around the winding core and laminated in the winding housing area, a connecting process in which the end of the wound winding is connected to the terminal electrode part, and a connecting process. A part of the outer peripheral surface of the coil part that has passed is immersed in a resin liquid tank to form a resin coating on the winding portion of the winding in the winding accommodating region, and the resin in the resin liquid layer is formed on a part of the outer peripheral surface. And a resin dipping process for forming a mark portion, and a coil component manufacturing method for manufacturing a coil component.

  According to such a manufacturing method, when a part of the outer peripheral surface portion of the core is immersed in the resin liquid layer, the resin liquid that has entered between the pair of flanges reaches the winding accommodating region due to capillary action. Can do. Since the winding is wound in the winding accommodating region, the gap between the wound windings is close. Therefore, the resin liquid that has reached the winding accommodating region can reach every corner of the wound winding through the gap between the windings. As a result, the winding portion of the winding is made of resin. Since it is covered, the winding can be protected by the resin liquid. Moreover, since a part of outer peripheral surface part of a core is immersed in a resin liquid, it will be in the state which the resin liquid adhered to a part of the outer peripheral surface part. As the resin liquid cures as it is, it is easy to determine the direction of the core, for example, the direction in which the terminal electrode part is aligned on the mounting surface, by predefining the position of the side part to be immersed Can do. In addition, since the formation of the mark and the resin coating of the winding can be performed at the same time, the assembly work of the coil component can be simplified.

  According to the coil component and the manufacturing method of the present invention, the resin can be easily injected and the direction can be easily identified.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS. A coil component 1 shown in FIG. 1 mainly includes a core 2, a single winding 6, a terminal electrode portion 7, and a resin coating 8.

  As shown in FIG. 2, the core 2 has a size of several mm square and an upper back of about 1 mm, and a substantially cylindrical core portion 3 with a magnetic material such as ferrite as a base material. The first hook part 4 and the second hook part 5 are provided at both ends of the winding core part 3 to form a pair. A winding accommodating area 2A in which the winding 6 is accommodated is defined around the core portion 3 and between the first collar 4 and the second collar 5. Since the 1st collar part 4 and the 2nd collar part 5 are symmetrical shapes, unless it mentions especially, only the 2nd collar part 5 is demonstrated and the detailed description about the 1st collar part 4 is abbreviate | omitted.

  The second flange portion 5 is a plate material having a predetermined thickness, and is configured such that a bottom surface 5A (FIG. 3) serving as a mounting surface on a substrate (not shown) forms a substantially octagon. Moreover, the 2nd collar part 5 is extended from the peripheral part of 5 A of bottom faces to the 1st collar part 4 side, as FIG. And a first missing circumferential surface 53, a second missing circumferential surface 54, a third circumferential surface 55, a fourth circumferential surface 56, a third missing circumferential surface 57, and a fourth missing circumferential surface 58. ing.

  The first peripheral surface 51 and the second peripheral surface 52 are parallel surfaces, and the first missing peripheral surface 53 and the second missing peripheral surface 54 are on one end side of the first peripheral surface 51 and the second peripheral surface 52. Is provided. The third missing peripheral surface 57 and the fourth missing peripheral surface 58 are provided at the other ends of the first peripheral surface 51 and the second peripheral surface 52. The third circumferential surface 55 is provided between the first missing circumferential surface 53 and the second missing circumferential surface 54, and the fourth circumferential surface 56 is between the third missing circumferential surface 57 and the fourth missing circumferential surface 58. Is provided. The third peripheral surface 55 and the fourth peripheral surface 56 are substantially parallel. An outer peripheral surface portion of the second flange portion 5 is configured from the first peripheral surface 51 to the fourth missing peripheral surface 58.

  The first peripheral surface 51, the second peripheral surface 52, the third peripheral surface 55, and the fourth peripheral surface 56 are substantially the same as other adjacent coil components and other electronic components when the coil component 1 is mounted on the substrate. It becomes an abutting surface or an adjacent surface close to it. The first missing peripheral surface 53, the second missing peripheral surface 54, the third missing peripheral surface 57, and the fourth missing peripheral surface 58 are seen when the bottom surface 5 </ b> A is viewed in the direction connecting the first collar portion 4 and the second collar portion 5. When the first peripheral surface 51, the second peripheral surface 52, the third peripheral surface 55, and the fourth peripheral surface 56 are extended, the corners of the four corners of a virtual quadrangle are chamfered. ing. Therefore, it is suppressed that the 1st missing peripheral surface 53, the 2nd missing peripheral surface 54, the 3rd missing peripheral surface 57, and the 4th missing peripheral surface 58 substantially contact | abut with another electronic component.

  As shown in FIGS. 2 and 4, the first flange 4 also has an upper surface 4 </ b> A that faces the bottom surface 5 </ b> A, and the first flange 4 corresponds to the outer peripheral surface of the second flange 5. The first peripheral surface 41, the second peripheral surface 42, the first missing peripheral surface 43, the second missing peripheral surface 44, the third peripheral surface 45, the fourth peripheral surface 46, and the third missing peripheral surface. 47 and a fourth missing peripheral surface 48.

  The winding 6 is made of a copper wire covered with an insulating coating, wound around the core 3 (FIG. 2), and housed in the winding housing area 2A as shown in FIG. . One end 6 </ b> A and the other end 6 </ b> B of the winding 6 are connected to the terminal electrode portion 7.

  The terminal electrode part 7 is composed of a first terminal electrode part 7A and a second terminal electrode part 7B. As shown in FIGS. 2 to 4, the first terminal electrode portion 7 </ b> A is provided over the first missing peripheral surface 53, a part on the bottom surface 5 </ b> A, and the third missing peripheral surface 57. The second terminal electrode portion 7B is provided on the second missing peripheral surface 54 and the bottom surface 5A so as to extend over a portion separated from the first terminal electrode portion 7A and the fourth missing peripheral surface 58. One end 6A of the winding 6 is connected to the first terminal electrode portion 7A at the first missing peripheral surface 53 portion, and the second terminal electrode portion 7B is connected to the first terminal electrode portion 7A at the second missing peripheral surface 54 portion. The other end 6B is connected.

  As shown in FIG. 4, a resin coating 8 is injected into a portion of the winding accommodating area 2 </ b> A where the winding 6 is wound, and the winding 6 is protected by the resin coating 8. Yes. Further, a mark portion 8A which is the same material as the resin coating 8 and is integral with the resin coating 8 is provided so as to protrude from the third peripheral surfaces 45 and 55, respectively. A first terminal electrode portion 7A and a second terminal electrode portion 7B are formed on the first missing peripheral surface 53 and the second missing peripheral surface 54 on both sides of the third peripheral surface 55 in the second flange portion 5, respectively. Since it is a connecting position with the line 6, the position of the terminal electrode portion 7 on the bottom surface 5 </ b> A that is the mounting surface can be known using the mark portion 8 </ b> A as a mark. Therefore, the misalignment at the time of mounting the coil component 1 can be suppressed by always making the direction which goes to the mark part 8A from the center part in the coil component 1 into a fixed direction.

  In the process of manufacturing the coil component 1, in order to form the resin coating 8 in the winding accommodating region 2A, first, the winding 6 is wound around the core portion 3 and laminated in the winding accommodating region 2A ( Winding step), one end 6A and the other end 6B of the wound winding 6 are connected to the terminal electrode portion 7 (connection step).

  Then, as shown in FIG. 5 (a), the core 2 is held with respect to the resin liquid tank W filled with the resin liquid so that the third peripheral surfaces 45 and 55 are the lower surfaces. The three circumferential surfaces 45 and 55 are moved to a position where they are in contact with the surface of the purpose liquid tank W and held (FIG. 5B). Since the core 2 has an upper back of about 1 mm, the space between the first collar 4 and the second collar 5 is approximately 0.4 mm. Therefore, when the third peripheral surfaces 45 and 55 are immersed in the resin liquid tank W, the resin liquid enters the winding accommodating region 2A between the first collar part 4 and the second collar part 5 by capillary action. (FIG. 5C). The winding 6 is wound in the winding accommodating area 2A, and since the winding 6 is tightly wound, the gap between the wound windings 6 is narrowed. In the capillary phenomenon, the degree of rise of the liquid is inversely proportional to the tube diameter, so that the force that raises the resin liquid works strongly at the winding portion of the winding 6 where the gap is formed narrowly. The resin liquid penetrates over the entire winding portion 6 (FIG. 5D). Then, as shown in FIG. 5 (e), when the core 2 is separated from the resin liquid tank W after the resin coating 8 is formed, the third peripheral surfaces 45 and 55 serving as contact surfaces with the resin liquid tank W are obtained. Thus, the resin liquid is attached to the resin liquid tank W, and the process of immersing in the resin liquid tank W is completed (resin immersing process). Thereafter, the resin liquid is cured to form the resin coating 8 and the mark portion 8A.

  The coil component according to the present invention is not limited to the above-described embodiment, and various modifications and improvements can be made within the scope described in the claims. For example, the mark portion 8A is provided in a place where the terminal electrode portion 7 is not formed. However, the mark portion 8A is not limited to this, and may be provided in the outer peripheral surface where the terminal electrode portion 7 is formed. According to such a structure, the terminal electrode part 7 will be protected by resin, and it will become difficult to produce a short circuit. Therefore, even if it is a case where the coil components 1 are mounted in high density, it is suppressed that the short circuit between adjacent coil components 1 generate | occur | produces. The resin constituting the resin coating 8 and the mark portion 8A only needs to have insulating properties, and may be, for example, a resin mixed with ferrite powder or the like. With this configuration, the characteristics of the coil component 1 can be changed. Moreover, although the resin liquid tank W was used as a thing which supplies resin, it is not restricted to this, For example, it is a resin supply apparatus which has the opening corresponding to the distance between the 1st collar part 4 and the 2nd collar part 5. Also good.

The perspective view of the coil components which concern on embodiment of this invention. The rear view of the core of the coil components which concern on embodiment of this invention. The bottom view of the coil components which concern on embodiment of this invention. The front view of the coil components which concern on embodiment of this invention. It is the schematic which shows the manufacturing method of the coil components which concern on embodiment of this invention, Comprising: (a) The state before immersing a core in a resin liquid tank, (b) The state where the core was immersed in the resin liquid tank, c) A view showing a state where the resin liquid is listed due to capillary action, (d) a state where the resin liquid covers the winding, and (d) a state where the core is pulled up from the resin liquid tank.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Coil component 2 Core 2A Winding accommodation area | region 3 Core part 4 First collar part 4A Upper surface 5 Second collar part 5A Bottom face 6 Winding 7B Terminal electrode 7 Terminal electrode part 7A First terminal electrode 7B Second terminal electrode 8 Resin Coating 8A Marking portion 41 First circumferential surface 42 Second circumferential surface 43 First missing circumferential surface 44 Second missing circumferential surface 45 Third circumferential surface 46 Fourth circumferential surface 47 Third missing circumferential surface 48 Fourth missing circumferential surface 51 First First circumferential surface 52 Second circumferential surface 53 First missing circumferential surface 54 Second missing circumferential surface 55 Third circumferential surface 56 Fourth circumferential surface 57 Third missing circumferential surface 58 Fourth missing circumferential surface

Claims (3)

A core having a winding core portion and a pair of flange portions provided at both ends of the winding core portion and having an outer peripheral surface, and defining a winding accommodating region by the winding core portion and the pair of flange portions;
A terminal electrode portion provided on at least one of the pair of flanges;
A winding wound around the core and connected to the terminal electrode;
An insulating resin layer covering a winding portion of the winding in the winding accommodating region;
A coil component having a mark portion that is attached to a part of the outer peripheral surface of the pair of flange portions and made of the same material as the insulating resin. A part of the terminal electrode portion is formed on the outer peripheral surface of the pair of flanges, and the winding is connected to the terminal electrode portion at the position of the outer peripheral surface,
The coil component according to claim 1, wherein the mark portion is attached to a connecting portion of the winding. A core having a winding core portion and a pair of flange portions provided at both ends of the winding core portion and having an outer peripheral surface, and defining a winding accommodating region by the winding core portion and the pair of flange portions; A method of manufacturing a coil component comprising: a terminal electrode part provided on at least one of the flange parts; and a winding wound around the core part and connected to the terminal electrode part,
A winding step of winding the winding around the winding core and stacking the winding in the winding accommodating region;
A connecting step of connecting the end of the wound winding to the terminal electrode portion;
A part of the outer peripheral surface of the coil component that has undergone the connecting process is immersed in a resin liquid bath to form a resin coating on the winding portion of the winding in the winding accommodating region, and A coil component manufacturing method, comprising: a resin immersion step of forming a mark portion with a resin in a resin liquid layer in the portion.

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