JP2010010597A - Coil part - Google Patents

Abstract

A coil component in which an electrode and a core are reliably insulated is provided.
SOLUTION: A conductive core 2, a conductive wire 8 and a conductive wire 9 wound around a core portion 3 of the core 2, an electrode 6 and an electrode 7 attached to the flange portion 4 and the flange portion 5 of the core 2, and the like. The electrode 6 and the electrode 7 each have a mounting surface, and the conductor 8 and the conductor 9 are connected to each other, and an insulating resin coating is provided at least at a position in contact with the core 2 on the mounting surface. A coil component in which the insulation between the electrode 6 and the electrode 7 and the core 2 is achieved by the resin coating formed on each of the above is provided.
[Selection] Figure 1

Description

  The present invention relates to a coil component, and more particularly to a coil component having a core made of a conductive material.

Conventionally, a Mn—Zn ferrite core, which is a high magnetic permeability material, is used in pulse transformers and the like that require high inductance. Since the Mn—Zn-based ferrite core has electrical conductivity, it is necessary to provide an insulating coating on the core as shown in Patent Document 1 in order to provide an electrode that serves as a connecting portion and a mounting portion of the conducting wire on the core. .
JP 05-347207 A

  When the entire core surface is coated by dipping the core, etc., the coating operation itself is simplified, but the processing area increases, so there is a high possibility of failure, and stress is applied to the core by the processed coating. In some cases, the core inductance decreased. Further, since the coating is performed up to a place unrelated to the electrode, the cost tends to increase. Furthermore, when mounting a metal-like electrode on the coated surface, the corners or edges of the electrode may come into contact with the coating and the coating may be peeled off or damaged, leading to a reduction in coating insulation. Then, an object of this invention is to provide the coil components which insulated the electrode and the core reliably.

  In order to solve the above-mentioned problems, the present invention has a conductive core, a winding wound around the core, a mounting surface mounted on the core, and the winding is connected, and at least the core on the mounting surface Provided is a coil component including an electrode having an insulating film formed at a contact point.

  According to such a configuration, since the insulating coating is provided only at the portion where the electrode and the core abut, the portion where the insulating coating is formed can be minimized. Further, since the core is not provided with the insulating coating, it is possible to prevent the stress caused by the insulating coating from being generated on the core. In addition, since the insulating coating is formed on the electrode in advance, the insulating coating is prevented from being damaged even if the electrode contacts the core when the electrode is mounted on the core.

  In the coil component having the above configuration, the core has a convex portion and forms an arrangement surface on which the electrode is disposed on the protruding end surface of the convex portion, and the region where the insulating film is formed on the mounting surface is formed larger than the arrangement surface. It is preferable.

  According to such a configuration, it is possible to increase the distance (extended surface distance) from the conductive core to the location where the insulating coating of the electrode is not formed (conduction location), and to ensure insulation between the core and the electrode. Can be planned.

  Moreover, it is preferable that an electrode has a side surface located in the periphery of a mounting surface, and the insulating film is formed in the mounting surface and the side surface.

  According to such a configuration, the distance between the conductive core and the conductive portion can be increased, and insulation between the core and the electrode can be ensured.

  Moreover, it is preferable that an electrode is comprised from a terminal metal fitting and the insulating film is formed by the surface treatment of the terminal metal fitting.

  According to such a configuration, the insulating coating can be easily formed. Further, it is possible to form an insulating coating that is difficult to peel off.

  In addition, it has a convex part protruding from the non-mounting surface of the electrode, the connecting surface to which the winding is connected is defined on the protruding end surface of the convex part, and the insulation coating is the entire surface of the electrode excluding the connecting surface It is preferable to be formed.

  According to such a configuration, the extended distance can be more reliably obtained, and insulation between the core and the electrode can be more reliably achieved.

  According to the coil component of the present invention, the electrode and the core can be reliably insulated.

  A coil component according to an embodiment of the present invention will be described with reference to FIGS. The coil component 1 according to the present embodiment is a coil component used as a common mode filter. The coil component 1 is mainly composed of a core 2, electrodes 6 and 7, and conductive wires 8 and 9.

  The core 2 is a Mn—Zn ferrite core having conductivity, and a core portion 3 having a substantially rectangular cross-section perpendicular to the longitudinal direction and a pair of substantially identical shapes provided at both ends in the longitudinal direction of the core portion 3. It is comprised from the collar part 4 and the collar part 5.

  The electrode 6 and the electrode 7 have the same shape, and are respectively provided on the flange 4 and the flange 5 by fitting or using an adhesive. Since the electrode 6 and the electrode 7 and the collar part 4 and the collar part 5 have the same shape, respectively, the collar part 4 and the electrode 6 will be described unless otherwise specified. Description is omitted.

  The electrode 6 is composed of a pair of terminal fittings 61 and 62 formed of a copper plate or an aluminum plate, and the terminal fitting 61 and the terminal fitting 62 have substantially the same shape. Therefore, the terminal fitting 61 will be described as a representative. As shown in FIG. 2, the terminal fitting 61 is configured in a substantially U shape, and a mounting surface 61 </ b> A that is mounted on the collar portion 4 is defined on the inner peripheral portion of the substantially U shape.

  A resin coating 63, which is an insulating coating, is applied to the mounting surface 61A over the entire surface. Since the resin coating 63, which is an insulating coating, is applied only to the portion where the terminal fitting 61 and the flange portion 4 abut, the portion where the insulating coating is applied is made the minimum region. Therefore, excessive insulation coating is not required, and costs can be suppressed. Moreover, since the insulation coating such as the resin coating 63 is not applied to the core 2, it is possible to prevent the core 2 from being stressed due to the insulation coating. Thereby, the inductance value fall of the core 2 can be suppressed. Further, since the resin coating 63 is formed on the terminal fitting 61 in advance, even if the terminal fitting 61 comes into contact with the core 2 when the terminal fitting 61 is attached to the collar portion 4, the resin coating 63 is suppressed from being damaged. The terminal fitting 61 and the flange 4 can be suitably insulated by the resin coating 63.

  As shown in FIG. 1, the conducting wire 8 and the conducting wire 9 are wound around the core portion 3. These conducting wire 8 and conducting wire 9 are covered conducting wires, and are connected to a terminal fitting 61 and a terminal fitting 62, respectively.

  According to the coil component 1 having the above configuration, the electrode 6 and the resin coating provided on the electrode 7 are interposed between the electrode 7 and the core 2, and the electrode 6, the electrode 7, and the conductive core 2 are connected. It can be reliably insulated.

  The coil component of the present invention is not limited to the above-described embodiment, and various improvements and modifications can be made within the scope described in the claims. For example, as shown in FIG. 3 and FIG. 4 as a first modified example, the convex portion 141 and the convex portion 142 having substantially the same shape protruding from the surface are provided on the collar portion 104, and the convex portion 141 and the convex portion are provided. Respective projecting end surfaces of 142 are referred to as arrangement surfaces 141A and 142A on which the terminal fitting 61 and the terminal fitting 62 are arranged. The placement surface 141A is smaller than the region where the resin coating 63 of the mounting surface 61A is formed (the region where the resin coating 63 of the mounting surface 61A is formed is larger than the placement surface 141A). The distance to the portion where the insulation coating is not formed: L (extended surface distance) can be increased, and insulation between the core and the electrode can be achieved reliably.

  Further, as shown in FIG. 5 as a second modification, a resin coating 63 may be applied over the entire periphery of the terminal fitting 161 including both side surfaces 161B and 161B of the mounting surface 161A. Even with such a configuration, it is possible to increase the distance L from the flange portion 104 to the terminal fitting 161, and it is possible to more suitably insulate the core and the electrode.

  Further, as shown in FIG. 6 as a third modification, the terminal fittings 261 and 262 are provided with convex portions 261C and 262C protruding from the opposite mounting surface, and the conductor 8 is connected to the protruding end surfaces of the convex portions 261C and 262C. Wired connection surfaces 261D and 262D are provided. By forming the resin coating 63 on the entire surface of the terminal fittings 261 and 262 except for the connecting surfaces 261D and 262D, it is possible to reliably earn the extended surface distance: L, and more reliably between the core and the electrode. Can be insulated. Further, in the configuration shown in FIGS. 5 and 6, since the side surface which is the front end side (portion A in FIG. 1) in the mounting direction of the terminal metal fitting is also covered with the resin coating 63, the terminal metal fitting is used as the hook metal. When mounting, it is suppressed that the corner | angular part of a terminal metal fitting contacts a collar part and a collar part is damaged.

In the present embodiment and the modification, the resin coating is used as the insulating coating. However, the present invention is not limited to this, and an insulating coating such as aluminum oxide (alumite) is formed on the surface of the electrode by surface treatment. good. According to such a configuration, the insulating coating can be easily formed and the insulating coating that is difficult to peel off can be formed.
In this embodiment, the common mode filter has been described. Needless to say, the present invention can also be applied to a pulse transformer 301 and a balun transformer as shown in FIG.

The perspective view of the coil components concerning embodiment of this invention. The side view which shows the relationship between the terminal metal fitting of the coil components concerning embodiment of this invention, and a core. The side view of the collar part and terminal metal fitting which concern on the 1st modification of the coil components concerning embodiment of this invention. Sectional drawing along the IV-IV line of FIG. Sectional drawing of the collar part and terminal metal fitting which concern on the 2nd modification of the coil components concerning embodiment of this invention. Sectional drawing of the collar part and terminal metal fitting which concern on the 3rd modification of the coil components concerning embodiment of this invention. The perspective view of the state which applied the coil components concerning embodiment of this invention to the pulse transformer.

Explanation of symbols

1 .. Coil parts 2.. Core 3.. Core part 4, 5.. Rift part 6, 7 .. Electrode 8, 9 .. Conductor wire 61, 62 .. Terminal fitting 61 A ... Mounting surface 63. coating

Claims (5)

A conductive core;
A winding wound around the core;
A coil component comprising: an electrode having a mounting surface to be mounted on the core, wherein the winding is connected, and an insulating film is formed at least at a position in contact with the core on the mounting surface. The core has a convex portion and an arrangement surface on which the electrode is arranged on the protruding end surface of the convex portion,
2. The coil component according to claim 1, wherein a region where the insulating film is formed on the mounting surface is formed larger than the arrangement surface.   3. The electrode according to claim 1, wherein the electrode has a side surface located at a peripheral edge of the mounting surface, and the insulating film is formed on the mounting surface and the side surface. Coil parts.   The coil component according to any one of claims 1 to 3, wherein the electrode is formed of a terminal fitting, and the insulating film is formed by a surface treatment of the terminal fitting. Having a convex portion projecting from the non-mounting surface of the electrode, and defining a connecting surface to which the winding is connected to the projecting end surface of the convex portion;
The coil component according to any one of claims 1 to 4, wherein the insulating coating is formed on the entire surface of the electrode excluding the connection surface.

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