JP2007173573A - Coil - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a coil capable of low height and high-density mounting. <P>SOLUTION: The coil 1 includes a core 2 provided with first and second flanges 4, 5 provided on both ends of a winding core having a winding 6 wound therearound, and first and second terminal electrodes 7A, 7B. In this coil 1, the first flange 5 consists of a substantially octagonal bottom surface 5A, first peripheral surface 51A, second peripheral surface 52A, first omitted peripheral surface 53A, second omitted peripheral surface 54A, third peripheral surface 55A, fourth peripheral surface, third omitted peripheral surface, and fourth omitted peripheral surface. The first terminal electrode 7A is provided over the first omitted peripheral surface 53A, one part of the bottom surface 5A, and the third omitted peripheral surface. The second terminal electrode 7B is provided over the second omitted peripheral surface 54A, a portion of the bottom surface 5A separated from the first terminal electrode 7A, and the fourth omitted peripheral surface. One end 6A of the winding 6 is wire-connected to the first terminal electrode 7A on the first omitted peripheral surface 53A, and the other end 6B is wire-connected to the second terminal electrode 7B on the second omitted peripheral surface 54A. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a coil component, and more particularly to a coil component including a drum core.

  2. Description of the Related Art Conventionally, in order to remove noise in an electronic device, a coil component including a core part, a core provided with flanges at both ends of the core part, and a winding wound around the core part has been used. When this coil component is mounted on the substrate, the end surface of one of the flanges is used as a mounting surface in consideration of stability and the like.

  Although an electrode is formed on the substrate, in order to energize this electrode, as shown in Patent Document 1, a terminal electrode is also provided on the mounting surface, and a winding is formed on the terminal electrode on the mounting surface. Connected

In recent electronic devices, for example, mobile phones, high-density mounting of internal devices is required as performance increases. Therefore, in order to reduce the volume of the coil component, the height is reduced and the distance between adjacent coil components is shortened.
Japanese Patent Laid-Open No. 2005-210055

  However, when the winding is connected on the mounting surface, the height of the winding is larger by the amount of the winding. Moreover, in patent document 1, although the hollow is formed in the mounting surface and it connects in the hollow, since the shape of a core becomes complicated in this case, while manufacture of a core becomes complicated, the fall of the intensity | strength of a core Was invited.

  In addition, when a coil component is mounted on a substrate, if it is mounted on the substrate only on the mounting surface, the mounting location cannot be seen, so an electrode may be formed on the peripheral surface of the buttocks. When the distance between them was shortened, there was a case where a short circuit occurred at the electrode part. Therefore, it is necessary to separate the coil parts adjacent to each other to some extent, which is an obstacle to achieving high-density mounting.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a coil component that can be reduced in height and mounted at high density.

  In order to solve the above-mentioned problems, the present invention provides a core composed of a core part and a first collar part and a second collar part provided at both ends of the core part, and a winding wound around the core part. Provided is a coil component including a wire and a terminal electrode portion provided on a first flange portion. In this coil component, the first flange portion has a bottom surface serving as one end surface of the core and a peripheral surface portion extending from the peripheral portion of the bottom surface to the other end surface side of the core. The bottom surface, when viewed in the direction connecting the first collar part and the second collar part, a position corresponding to the first corner located at one end of one side of the quadrangle and one end of two sides facing one side or A position corresponding to the second corner located at one of the other ends has a first missing side and a second missing side, each of which is formed by chamfering or notching. The peripheral surface portion includes a first peripheral surface extending from one side, a second peripheral surface extending from the second side, a first missing peripheral surface extending from the first missing side and adjacent to the first peripheral surface. And a second missing peripheral surface extending from the second missing side and adjacent to the second circumferential surface. The terminal electrode portion is composed of a first terminal electrode and a second terminal electrode, the first terminal electrode is provided across the first missing peripheral surface and a part of the bottom surface, and the second terminal electrode is the second missing circumference. It is provided across the surface and the bottom surface, and the part spaced apart from the first terminal electrode. One end of the winding is connected to the first terminal electrode at the first missing peripheral surface, and the other end of the winding is connected to the second terminal electrode at the second missing peripheral surface.

  According to such a configuration, since the winding is connected at the outer peripheral surface portion of the core, the winding is not wired on the bottom surface serving as the mounting surface. Therefore, the upper back of the coil component can be defined only by the distance from one end surface to the other end surface of the core, and the coil component can be reduced in height. The first missing peripheral surface and the second missing peripheral surface are located between a virtual plane including the first peripheral surface and a virtual plane including the second peripheral surface. In this case, even if the first peripheral surface or the second peripheral surface is in contact with another coil component, the first missing peripheral surface and the second missing peripheral surface are prevented from contacting other coil components. Therefore, the terminal electrode part formed on the first missing peripheral surface and the second missing peripheral surface and the solder fillet formed on the terminal electrode part are suppressed from coming into contact with other coil parts. Even if it is narrowed, the occurrence of a short circuit is suppressed.

  In the coil component configured as described above, the bottom surface has a position corresponding to the third corner located at the other end of one side and a position corresponding to the fourth corner located at either the other end or one end of the two sides. Each has a third missing side and a fourth missing side configured by chamfering or notching, and the peripheral surface portion extends from the third missing side and is adjacent to the first circumferential surface. It is preferable to further have a surface and a fourth missing peripheral surface extending from the fourth missing side and adjacent to the second circumferential surface.

  According to such a configuration, in the core, for example, the first missing peripheral surface, the second missing peripheral surface, the third missing peripheral surface, and the fourth missing peripheral surface can be configured as symmetrical shapes. Therefore, the terminal electrode part can be formed on the core regardless of the position of each missing peripheral surface.

  The first terminal electrode is provided across the first missing peripheral surface and a part of the bottom surface and the third missing peripheral surface, and the second terminal electrode is the second missing peripheral surface and the bottom surface, and the first terminal electrode It is preferable that it is provided over the separated part and the fourth missing peripheral surface.

  According to such a configuration, after the terminal electrode portion is formed on the core, the first missing peripheral surface, the second missing peripheral surface, the third missing peripheral surface, and the fourth missing peripheral surface can be configured as symmetrical shapes. it can. Therefore, the terminal electrode portion can be connected regardless of the position of each missing peripheral surface.

  Further, the bottom surface is formed in an octagon by the chamfered first missing side, the second missing side, the third missing side, and the fourth missing side, and each side of the octagonal bottom surface is formed on the peripheral surface portion. It is preferable to provide a peripheral surface corresponding to.

  According to such a configuration, the first missing peripheral surface to the fourth missing peripheral surface can have the same shape. In this case, since both are symmetrical shapes, a terminal electrode portion can be formed on the core and connected to the formed terminal electrode portion regardless of the position of each missing peripheral surface. In addition, by making it a regular octagon in particular, it can be the same shape on all the peripheral surfaces of the first missing peripheral surface to the fourth missing peripheral surface and the first peripheral surface to the fourth peripheral surface. Since the terminal electrode portion can be formed on any peripheral surface, workability at the time of forming the terminal electrode can be increased.

  According to the coil component of the present invention, it is possible to achieve a low profile and high-density mounting.

  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, and a terminal electrode portion 7.

  The core 2 is made of a magnetic material such as ferrite as a base material, and has a substantially cylindrical core part 3 (FIG. 2), and a first hook part 4 and a second hook that are provided at both ends of the core part 3 to form a pair. Part 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 description about the 1st collar part 4 is abbreviate | omitted.

  The second flange portion 5 has a predetermined thickness and is configured in a substantially plate shape with a bottom surface 5A having a substantially octagonal shape, and the bottom surface 5A has all sides of the same length as shown in FIG. A first side 51, a second side 52, a first missing side 53, a second missing side 54, a third side 55, a fourth side 56, a third missing side 57, and a fourth missing side. Side 58.

  The first side 51 and the second side 52 are parallel sides, and the first missing side 53 and the second missing side 54 are provided on one end side of the first side 51 and the second side 52. The third missing side 57 and the fourth missing side 58 are provided at the other ends of the first side 51 and the second side 52. The third side 55 is provided between the first missing side 53 and the second missing side 54, and the fourth side 56 is provided between the third missing side 57 and the fourth missing side 58. The third side 55 and the fourth side 56 are substantially parallel. The peripheral edge portion of the bottom surface 5 </ b> A is constituted by the first side 51 to the fourth missing side 58.

  When the coil component 1 is mounted on the substrate, the first side 51, the second side 52, the third side 55, and the fourth side 56 are substantially in contact with other adjacent coil components or other electronic components, or Adjacent and adjacent sides. The first missing side 53, the second missing side 54, the third missing side 57, and the fourth missing side 58 are as follows when the bottom surface 5A is viewed in the direction connecting the first collar part 4 and the second collar part 5. The first side 51, the second side 52, the third side 55, and the fourth side 56 are each configured to be chamfered at the corners of the four corners of a virtual quadrangle. Therefore, the first missing side 53, the second missing side 54, the third missing side 57, and the fourth missing side 58 are prevented from substantially contacting with other electronic components. This bottom surface 5A is an end surface of the core 2 and serves as a mounting surface mounted on a substrate (not shown).

  As shown in FIG. 4, the first flange portion 4 also has a bottom surface 4 </ b> A that is the other end surface. Further, as shown in FIG. 4, the second flange 5 is a first peripheral surface 51 </ b> A, a second peripheral surface 52 </ b> A, and a second peripheral surface extending from the peripheral edge of the bottom surface 5 </ b> A toward the bottom surface 4 </ b> A. One missing circumferential surface 53A, second missing circumferential surface 54A, third circumferential surface 55A, fourth circumferential surface 56A (FIG. 2), third missing circumferential surface 57A, and fourth missing circumferential surface 58A are provided. is doing. The first peripheral surface 51A to the fourth missing peripheral surface 58A extend from the corresponding first side 51 to fourth missing side 58, respectively.

  The winding 6 is configured by winding a copper wire covered with an insulating coating around the winding core portion 3, and one end 6 </ b> A and the other end 6 </ b> B are connected to the terminal electrode portion 7.

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

  FIG. 5 shows a state in which the coil component 1 having the above configuration is aligned on a substrate (not shown). In this state, in the plurality of coil components 1, the first peripheral surface 51 </ b> A of one coil component 1 and the second peripheral surface 52 </ b> A of another coil component 1 are close to each other, and the third peripheral surface 55 </ b> A of the one coil component 1. And the fourth peripheral surface 56A of the other coil component 1 are mounted in proximity to each other. In this case, the first missing peripheral surface 53A of one coil component 1 and the second missing peripheral surface 54A of the other coil component 1 are arranged at positions adjacent to each other. Since the surface 54A is formed by chamfering at the first peripheral surface 51A and the second peripheral surface 52A, respectively, the first terminal electrode 7A formed on the first missing peripheral surface 53A and the second missing peripheral surface 54A and It is suppressed that the 2nd terminal electrode 7B contacts or through a solder ferret and short-circuits. Similarly, the first missing peripheral surface 53A of one coil component 1 and the third missing peripheral surface 57A of the other coil component 1 are arranged at adjacent positions, but both are formed by chamfering. It is suppressed that the 1st terminal electrode 7A and the 2nd terminal electrode 7B which were formed in each contact and short-circuit. Therefore, high-density mounting is possible in the coil component 1.

  Further, as shown in FIG. 4, the winding 6 is connected to the terminal electrode portion 7 at the first missing peripheral surface 53 </ b> A and the second missing peripheral surface 54 </ b> A that are the outer peripheral portions of the core 2. There is no wiring on the bottom surface 5A to be the mounting surface. Therefore, the upper back of the coil component 1 can be defined only by the distance from the bottom surface 5A, which is one end surface of the core 2, to the upper surface 4A, which is the other end surface, and the coil component 1 can be reduced in height. Further, since the winding is connected at the first missing peripheral surface 53A and the second missing peripheral surface 54A, the connected portion can be easily visually recognized even after the coil component 1 is mounted on a substrate (not shown). can do. Therefore, even after the coil component 1 is mounted, an appearance inspection such as a ferret can be easily performed.

  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, as a first modified example, as shown in FIG. 6, the second flange 15 may have a shape in which only the first missing side 153 and the second missing side 154 are formed. Even if it is such a shape, it is a connecting part to the 1st missing peripheral surface 153A extended from the 1st missing side 153 which is a chamfered location, and the 2nd missing peripheral surface 154A extended from the 2nd missing side 154 Therefore, it is possible to make the coil component low in profile and to achieve high-density mounting. In the second flange 15, the second missing side 154 may be located at the opposite position, that is, at the corner where the second side 152 and the third side 155 intersect.

  As shown in FIG. 7, as a second modification, in the coil component 21, the shape of the bottom surface 25 </ b> A is the first side 251, the second side 252, the first missing side 253, the second missing side 254, and the third It may be a hexagon defined by the missing side 257 and the fourth missing side 258. Even in such a shape, in the plurality of coil components 21 mounted on the substrate (not shown), the first missing side 253 related to one coil component 31 and the second missing side 254 related to the other coil component 21 exist. It is suppressed that a short circuit occurs due to contact with a solder ferret or the like.

  As shown in FIG. 8, as a third modification, in the coil component 31, the first missing side 353, the second missing side 354, the third missing side 357, and the fourth missing side 358 are the first side 351, the second side 352, the third side 355, and the four sides of the fourth side 356 may be cut out and formed. Even if it is such a structure, the effect similar to the coil component 1 can be acquired.

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. The partial bottom view in the state where a plurality of coil parts concerning an embodiment of the invention were arranged. The bottom view which concerns on the 1st modification of the coil components which concern on embodiment of this invention. The bottom view which concerns on the 2nd modification of the coil components which concern on embodiment of this invention. The bottom view which concerns on the 3rd modification of the coil components which concern on embodiment of this invention.

Explanation of symbols

1 .. Coil parts 2.. Core 3.. Core part 4.. First collar 4 A.. Upper surface 5. Second collar 5 A. Bottom surface 6 Winding 7 Terminal electrode 7 A -First terminal electrode 7B-Second terminal electrode 51-First side 51A-First peripheral surface 52-Second side 52A-Second peripheral surface 53-First missing side 53A-First Missing peripheral surface 54 ··· Second missing side 54A · · Second missing peripheral surface 55 · · Third side 55A · · Third circumferential surface 56 · · Fourth side 56A · · Fourth circumferential surface 57 · · Third missing Side 57A ··· Third missing peripheral surface 58 · · Fourth missing peripheral surface 58A · · Fourth missing peripheral surface

Claims (4)

A core composed of a core part and a first collar part and a second collar part provided at both ends of the core part;
A winding wound around the core;
A terminal electrode portion provided on the first collar,
The first flange has a bottom surface that is one end surface of the core, and a peripheral surface portion that extends from the peripheral edge of the bottom surface to the other end surface side of the core,
The bottom surface, when viewed in a direction connecting the first collar part and the second collar part, a position corresponding to a first corner located at one end of one side of the quadrangle and one end of two sides facing the one side Or a position corresponding to a second corner located at one of the other ends and a first missing side and a second missing side configured by chamfering or notching, respectively,
The peripheral surface portion includes a first peripheral surface extending from the one side, a second peripheral surface extending from the second side, a first peripheral surface extending from the first missing side and adjacent to the first peripheral surface. One missing circumferential surface, and a second missing circumferential surface extending from the second missing side and adjacent to the second circumferential surface,
The terminal electrode portion is composed of a first terminal electrode and a second terminal electrode,
The first terminal electrode is provided across the first missing peripheral surface and a part of the bottom surface,
The second terminal electrode is provided across the second missing peripheral surface and the bottom surface and a portion separated from the first terminal electrode,
One end of the winding is connected to the first terminal electrode at the first missing peripheral surface,
A coil component wherein the other end of the winding is connected to the second terminal electrode at the second missing peripheral surface. The bottom surface is chamfered by a position corresponding to a third corner located at the other end of the one side and a position corresponding to a fourth corner located at either the other end or one end of the two sides, respectively. It further has a third missing side and a fourth missing side constituted by being cut out,
The peripheral surface portion includes a third missing peripheral surface extending from the third missing side and adjacent to the first peripheral surface, and a fourth extending from the fourth missing side and adjacent to the second peripheral surface. The coil component according to claim 1, further comprising a missing peripheral surface. The first terminal electrode is provided across the first missing peripheral surface, a part of the bottom surface and the third missing peripheral surface,
The second terminal electrode is provided across the second missing peripheral surface, the bottom surface, a portion spaced from the first terminal electrode, and the fourth missing peripheral surface. 2. The coil component according to 2.   The bottom surface is formed in an octagon shape by the chamfered first missing side, the second missing side, the third missing side, and the fourth missing side. The coil component according to any one of claims 2 and 3, further comprising a peripheral surface corresponding to each side of the square bottom surface.

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