JP2009117627A - Surface-mounted type coil component - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a surface-mounted type coil component that has realized space reduction suitable for reduction in profile of height and high-density mount. <P>SOLUTION: A coil component 1 includes a core 3 having a wind part 4 and a collar part 5 and composed of a conductive material, an insulating case 2 in which an accommodation space 2a for accommodating the core 3 is formed, a terminal metal fitting 7 having a mounted part to be mounted on a mount surface W on a substrate and to be fixed mechanically on the case 2 in a state where at least part of the mounted part is exposed to the outside, and a winding that is connected to the terminal metal fitting 7 and at the same time, wound around the wind part 4 via the case 2, wherein the accommodating space 2a is defined by including a bottom surface 2A substantially parallel with the mount surface W, the wind part 4 and the collar part 5 have a lower surface of the wind part 4 and a low surface of the collar part 5, respectively, in opposition to the bottom surface 2A, the lower surface of the wind part 4 is in the same plane with respect to the lower surface of the collar part 5, a leg part 24 protruding toward the mount surface W is defined in a position in opposition to the collar part 5 of the case 2, and the mounted part of the terminal metal fitting 7 is arranged in the leg part 24. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a coil component, and more particularly to a surface mount type coil component.

Conventionally, for example, a coil component using a conductive material such as Mn—Zn-based ferrite capable of obtaining high magnetic permeability as a core has been manufactured. Since this coil component is a conductive core, as shown in Patent Document 1, the terminal electrode cannot be directly provided on the drum core, and the surface mounting structure cannot be obtained.
Japanese Patent No. 3710042

  With recent miniaturization of electronic devices, high-density mounting is also required for coil components. In the case of using a conductive core, when mounting the coil component shown in Patent Document 1 on a substrate, it is considered that a terminal electrode is formed through an insulator. Limited to the vicinity of the buttocks. Although it is conceivable to form a terminal electrode on the side of the drum core collar, in this case, the mounting area increases, which is not suitable for high-density mounting. Therefore, when a terminal electrode is formed by providing an insulator on the mounting surface side, the drum core made of a conductive material and the terminal fitting are too close to each other, so that it is necessary to make the insulator portion sufficiently thick to ensure insulation. . Therefore, this time, the upper part of the coil component becomes higher by the amount of the leg of the buttocks and the insulator, which is against high-density mounting.

  Therefore, an object of the present invention is to provide a surface mount type coil component that realizes a low profile and a small space suitable for high density mounting.

  In order to solve the above problems, the present invention provides a core having a winding part and a non-winding part and made of a conductive material, an insulating container in which a housing space for housing the core is formed, and a substrate A terminal fitting that has a mounting portion mounted on the upper mounting surface and is mechanically fixed to the insulating container with at least a portion of the mounting portion exposed to the outside, and is connected to the terminal fitting and insulated Provided is a surface mount type coil component including a winding wound around a winding portion via a conductive container. In this surface mount type coil component, the accommodating space is defined including a bottom surface substantially parallel to the mounting surface, and the winding portion and the non-winding portion are the lower surface of the winding portion and the lower surface of the non-winding portion that face the bottom surface. The lower surface of the winding part is in the same plane or protrudes from the lower surface of the non-winding part, and protrudes toward the mounting surface at a position facing the non-winding part of the insulating container. A leg portion is defined, and a mounting portion for the terminal fitting is disposed on the leg portion.

  According to such a configuration, the insulator that becomes the leg portion including the terminal fitting is arranged in place of the leg of the core in the non-winding portion of the core, thereby reducing the height of the surface mount type coil component. In addition, it is possible to reduce the space suitable for high-density mounting.

  In the surface-mounted coil component having the above-described configuration, it is preferable that the terminal fitting has a fixing portion embedded in the insulating container, and the fixing portion is configured in a blade shape.

  According to such a structure, a terminal metal fitting can be reliably fixed to an insulating container. In particular, even when the terminal fitting is affected by heat during mounting or connection, the terminal fitting can be prevented from falling off the insulating container.

  The insulating container has a winding part side wall that surrounds the winding part, and the winding part side wall has the upper end edge of the winding part side wall and the winding part upper end in a state where the core is placed on the bottom surface. It is preferable to be located above the same position or the upper end of the winding part.

  According to such a configuration, the contact between the winding and the core can be prevented without covering the entire periphery around the winding portion with the insulator.

  The surface mount type coil component preferably further includes a plate member having a smooth surface. According to such a configuration, it is possible to perform suction mounting using a smooth surface as a suction surface.

  The plate-like member is preferably made of a magnetic material, and the non-winding portion has a non-winding portion upper surface that is the opposite surface of the winding portion lower surface and is mirror-finished. It is preferable to have a contact surface that contacts the upper surface and is mirror-finished.

  According to such a configuration, a closed magnetic path can be formed by the core and the plate-like member, and desired characteristics can be obtained more easily.

  The insulating container has a non-winding portion side wall surrounding the non-winding portion, and the non-winding portion side wall is unwound at the upper end edge of the non-winding portion side wall in a state where the core is placed on the bottom surface. It is preferable to be located at the same position as the upper end of the turn part or above the upper end of the non-winding part.

  According to such a configuration, since the upper end of the non-winding portion is exposed from the insulating container, the plate-like member can be easily disposed on the contact surface located at the upper end of the non-winding portion.

  In the insulating container, it is preferable that a groove is formed in the vicinity of the terminal fitting, and the winding is disposed in the groove and extends from the terminal fitting to the periphery of the winding portion.

  According to such a configuration, since the winding is guided to the terminal fitting by the groove, the exposed portion of the winding on the surface-mounted coil component surface can be reduced, and space-saving of the surface-mounted coil component can be achieved. it can.

  In addition, a portion that accommodates the non-winding portion of the insulating container is provided with a mounting portion and a non-winding portion facing surface that faces the mounting surface is defined, and the portion that accommodates the winding portion of the insulating container The winding portion facing surface facing the mounting surface is defined, the winding portion facing surface is configured to be concave with respect to the non-winding portion facing surface, and the non-winding portion facing surface is the winding portion facing surface It is preferable that the inclined surface which inclines toward is formed.

  According to such a structure, the wiring of the coil | winding extended from a winding part to a terminal metal fitting can be performed smoothly.

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

  Hereinafter, a surface mount coil component according to an embodiment of the present invention will be described with reference to FIGS. A surface mount type coil component 1 shown in FIG. 1 has a size of about 4.5 × 3.2 × 2.1 mm and constitutes a pulse transformer, and includes a case 2, a core 3, and a plate shape. It is mainly composed of a core 6, terminal fittings 7, and windings 8. The core 3 has a winding part 4 and a pair of flange parts 5 and 5 disposed at both ends of the winding part 4 as shown in FIG.

  The case 2 is an insulating container made of an insulating resin. As shown in FIG. 3 and FIG. 4, the case 2 has a bottom wall 21 having a bottom surface 2 </ b> A and a side wall standing from the bottom wall 21. It is mainly comprised from a pair of winding part side wall 22,22 and a pair of collar part side wall 23,23 located in the both ends of winding part side wall 22,22, 2 A of bottom parts, winding part side wall 22, and collar part side wall 23, an accommodation space 2 a that can accommodate the core 3 is formed. As shown in FIG. 3, the pair of winding side walls 22, 22 are arranged so as to surround the winding part 4, and the pair of flange side walls 23, 23 each surround the pair of flanges 5. ing. The pair of winding side walls 22 and 22 and the pair of flange side walls 23 and 23 are configured to have the same height from the bottom surface 2A. Since the pair of flange side walls 23 and 23 are symmetrical to each other, the flange side wall 23 on one side will be mainly described. Further, since the pair of winding side walls 22 and 22 are symmetrical to each other, the description will be mainly given with respect to the winding side wall 22 on one side.

  As shown in FIG. 4, the bottom surface 2A is formed so as to be substantially parallel to the mounting surface W of the substrate on which the coil component 1 (FIG. 1) is mounted.

  A winding portion facing surface 22A is defined at a position of the case 2 that faces the winding portion 4 and that is below the winding portion side wall 22. Further, a leg portion 24 that protrudes toward the mounting surface W is defined at a position of the case 2 that faces the flange portion 5 and is below the flange side wall 23. A flange-facing surface 24A that faces the mounting surface W is defined at the end of the leg portion 24 in the protruding direction, and the terminal fitting 7 is disposed on the flange-facing surface 24A. Since the leg portion 24 protrudes, the winding portion facing surface 22A is configured to be concave with respect to the flange portion facing surface 24A. An inclined surface 24B that is inclined toward the winding portion facing surface 22A is formed at the end of the flange portion facing surface 24A on the winding portion facing surface 22A side. As shown in FIG. 5, the inclined surface 24B is provided with a pair of protrusions 24C and 24C, and a groove 24c is defined between the pair of protrusions 24C and 24C.

  The core 3 shown in FIG. 2 is a high magnetic permeability ferrite core with Mn—Zn-based low-resistance conductivity, and a pair of windings 4 disposed at both ends of the winding part 4 and the winding part 4 as described above. And 5 are arranged mainly in the housing space 2a. Since the pair of flanges 5 and 5 have a symmetrical shape, the flange 5 on one side will be mainly described.

  As shown in FIGS. 3 and 4, the winding portion 4 is disposed at a position surrounded by the pair of winding portion side walls 22, 22, and as shown in FIG. 4, the upper end of the winding portion 4. Is configured to be lower than the upper end of the winding portion side wall 22. As shown in FIG. 3, the flange 5 is disposed at a position surrounded by the flange side wall 23, and the upper end of the flange 5 protrudes from the upper end of the flange side wall 23 as shown in FIG. 4. It is configured as follows. This protrusion amount is configured to be 0.5 mm or less.

  Further, a contact surface 5A that is mirror-finished as shown in FIGS. 2 and 3 is formed at the upper end of the flange portion 5. As shown in FIG. 4, the lower surfaces of the winding portion 4 and the flange portion 5 that face the bottom surface 2A are on the same plane, and the figure is provided between the lower surface and the bottom surface 2A of each of the winding portion 4 and the flange portion 5. An adhesive (not shown) is arranged to fix the core 3 in the accommodation space 2a.

  The plate-like core 6 is made of a magnetic material and is configured in a flat plate shape with a smooth upper surface as shown in FIG. The plate-like core 6 is placed across the contact surfaces 5A and 5A of the pair of flanges 5 and 5, and is fixed with an adhesive (not shown). Further, the surface to be bonded to the contact surfaces 5A and 5A of the plate-like core 6 is mirror-finished. Since the flange portion 5 and the plate-like core 6 are in contact with each other on the mirror-finished surface, the flange portion 5 and the plate-like core 6 can be reliably in contact with each other to form a suitable closed magnetic circuit. Since the upper end of the flange 5 protrudes from the upper end of the flange side wall 23 of the case 2, the case 2 does not get in the way when the plate-like core 6 is placed on the flange 5, and is preferably placed. be able to. Further, since the plate-like core 6 has a smooth surface, when the coil component 1 is mounted, the smooth surface can be suction mounted using the smooth surface.

  As shown in FIG. 5, three terminal fittings 7 (first terminal 7A, second terminal 7B, and third terminal 7C) are provided on each flange-facing surface 24A. 71 and a blade-like fixing portion 72 extending from the end portion of the mounting portion 71. The terminal fitting 7 is fixed to the case 2 by embedding the fixing portion 72 from the flange portion facing surface 24 </ b> A into the leg portion 24. Since the mounting portion 71 is a connecting portion and a portion that is mounted on the mounting surface W (FIG. 4), it may be heated strongly. 7 is suppressed from falling off the case 2, and the terminal fitting 7 can be firmly fixed to the case 2.

  The winding 8 is composed of four windings (first winding 8A, second winding 8B, third winding 8C, fourth winding 8D) as shown in FIG. It is wound around the winding part 4 via two pairs of winding part side walls 22 and 22. As shown in FIG. 4, the winding part 4 is built in the accommodating space 2 a, and the upper end is lower than the upper ends of the pair of winding part side walls 22, 22. Even if it is not covered with an insulator, contact with the winding 8 (FIG. 6) around which the winding portion 4 is wound is suppressed, and a short circuit between the winding 8 and the core 3 is prevented.

  As shown in FIG. 6, the first winding 8 </ b> A is wound around the winding portion 4 after being connected to the first terminal 7 </ b> A on the one flange portion 5 side, and the second winding on the one flange portion 5 side. It is connected to the terminal 7B. The second winding 8B is wound around the winding part 4 after being connected to the third terminal 7C on the one flange part 5 side, and is connected to the second terminal 7B on the one flange part 5 side. Yes. The third winding 8C is wound around the winding portion 4 after being connected to the first terminal 7A on the other flange 5 side, and is connected to the second terminal 7B on the other flange 5 side. Yes. The fourth winding 8D is wound around the winding part 4 after being connected to the third terminal 7C on the other flange part 5 side, and is connected to the second terminal 7B on the other flange part 5 side. Yes.

  Each of the windings 8A to 8D is wired from the periphery of the winding part 4 to the periphery of the protrusion 24C and the groove 24c on the inclined surface 24B, and is wired to the respective terminals 7A to 7B. With such a configuration, the portion of the coil 8 exposed on the surface of the coil component 1 can be reduced, and the space of the coil component 1 can be reduced, and the coil 8 extends from the periphery of the winding portion 4 to the terminal fitting 7. Wiring 8 can be smoothly routed.

  According to the coil component 1 according to the present embodiment, the core 3 and the mounting surface W are short-circuited by disposing the insulator leg portion 24 provided with the terminal fitting 7 at the position of the flange portion 5 of the core 3. Is suppressed. Moreover, since the collar part 5 is comprised so that the lower surface may become the same plane as the lower surface of the winding part 4, and the leg part 24 is arrange | positioned at the lower part of the lower surface, the coil component 1 can be made low-profile. it can. Therefore, it is possible to reduce the height of the coil component 1 and reduce the space suitable for high-density mounting.

  The surface mount coil component of 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, Fe or an Fe—Si—Cr alloy may be used as the core material. As a material of the case, ceramic or ferrite may be used as long as it is an insulator.

The perspective view from the upper surface direction of the surface mount type coil component which concerns on embodiment of this invention. The disassembled perspective view which shows the relationship between the core and case of surface mount type coil components which concern on embodiment of this invention. The top view which shows the relationship between the core and case of surface mount type coil components which concern on embodiment of this invention. The side view which shows the relationship between the core and case of surface mount type coil components which concern on embodiment of this invention. The bottom view which shows the relationship between the core and case of surface mount type coil components which concern on embodiment of this invention. The perspective view from the lower surface direction of the surface mount type coil component which concerns on embodiment of this invention.

Explanation of symbols

1. ・ Coil parts 2. ・ Case 2A ・ ・ Bottom surface 2a ・ ・ Accommodating space 3 ・ ・ Core 4 ・ ・ Wound part 5 ・ ・ Hut 5A ・ ・ Contact surface 6 ・ ・ Plate core 7 ・ ・ Terminal fitting 7A to 7C ··· First terminal to third terminal 8 · · Winding 8A to 8D · · First to fourth winding 21 · · Bottom wall 22 · · Side wall 22A · · Winding portion opposite Surface 23 ··· Side wall 24 ··· Leg 24A · · · Face 24B · · Inclined surface 24C · · Projection 24c · · · groove 71 · · mounting portion 72 · · · fixed portion W · · · mounting surface

Claims (9)

A core having a winding part and a non-winding part and made of a conductive material;
An insulating container in which a housing space for housing the core is formed;
A terminal fitting that has a mounting portion mounted on a mounting surface on a substrate and is mechanically fixed to the insulating container with at least a portion of the mounting portion exposed to the outside;
A winding that is connected to the terminal fitting and is wound around the winding portion via the insulating container;
The accommodating space is defined including a bottom surface substantially parallel to the mounting surface,
The winding portion and the non-winding portion respectively have a lower surface of the winding portion and a lower surface of the non-winding portion facing the bottom surface, and the lower surface of the winding portion is flush with or projects from the lower surface of the non-winding portion In a state
A leg projecting toward the mounting surface is defined at a position facing the non-winding part of the insulating container, and the mounting part of the terminal fitting is disposed on the leg. Surface mount type coil parts.   The surface-mounting coil component according to claim 1, wherein the terminal fitting has a fixing portion embedded in the insulating container, and the fixing portion is configured in a blade shape. The insulating container has a winding part side wall surrounding the winding part,
The winding portion side wall is such that the upper end edge of the winding portion side wall is located at the same position as the upper end of the winding portion or above the upper end of the winding portion in a state where the core is placed on the bottom surface. The surface-mounting coil component according to claim 1, wherein the surface-mounting coil component is characterized by the following.   The surface mount type coil component according to any one of claims 1 to 3, further comprising a plate-like member having a smooth surface.   5. The surface mount coil component according to claim 4, wherein the plate member is made of a magnetic material. The non-winding portion has an upper surface of the non-winding portion that is opposite to the lower surface of the winding portion and is mirror-finished.
6. The surface-mounting coil component according to claim 4, wherein the plate-like member has a contact surface that is in contact with the upper surface and is mirror-finished. The insulating container has a non-winding portion side wall surrounding the non-winding portion,
The non-winding portion side wall is such that the upper end edge of the non-winding portion side wall is located at the same position as the non-winding portion upper end or below the non-winding portion upper end in a state where the core is placed on the bottom surface. The surface-mounted coil component according to claim 6, wherein   In the insulating container, a groove is formed in the vicinity of the terminal fitting, and the winding is arranged in the groove and extends from the terminal fitting to the periphery of the winding portion. The surface mount coil component according to any one of claims 1 to 7. The mounting portion is disposed in the portion of the insulating container that accommodates the non-winding portion, and a non-winding portion facing surface that faces the mounting surface is defined,
A portion of the insulating container that accommodates the winding portion is defined with a winding portion facing surface that faces the mounting surface.
The winding portion facing surface is configured to be concave with respect to the non-winding portion facing surface,
The surface-mounted coil component according to any one of claims 1 to 8, wherein the non-winding portion facing surface is formed with a slope inclined toward the winding portion facing surface.

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