KR20150067003A - Smd typed inductor and method for making the same - Google Patents

Abstract

Disclosed is an SMD typed inductor which reduces electric contact resistance between the metal core of an insulating coil and an external electrode. The inductor includes a core of a magnetic material; an insulating coil wound around the outside of the core; a mold body which is received to bury the core and the insulating coil, has the end of the insulating coil which protrudes from opposite two sides, and is made of a soft-magnetism metal mold using soft-magnetism metal powder having magnetism; and an external electrode which is formed on a side opposite to the mold body, and is electrically connected to the metal core of the end of the protruding insulating coil. The metal core is exposed to the outside by applying a physical force to the end of the protruding insulating coil. The external electrode is electrically connected to the exposed metal core.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a surface mount type inductor,

The present invention relates to a surface mount type inductor, and more particularly to a surface mount type inductor that reduces electrical contact resistance between an external electrode and a metal core member of an insulation coil and improves reliability of electrical contact, and a manufacturing method that can economically and efficiently manufacture the inductor Lt; / RTI >

The present invention also relates to a power inductor having a high inductance value and capable of flowing a high current.

Electronic components using ceramic materials include capacitors, inductors, piezoelectric elements, varistors or thermistors.

Among these ceramic electronic components, an inductor is one of important passive elements forming an electronic circuit together with a resistor and a capacitor, and is used as a component that removes noise or forms an LC resonance circuit.

Such inductors can be classified into various types such as a lamination type, a coil winding type, and a thin film type according to the structure.

Generally, a wire wound type inductor is advantageous in that it has higher accuracy than a multilayer type inductor, has a high inductance, and can have a large allowable current.

Among these, the surface-mountable wound-wire type inductor is formed by winding an insulating coil around an inner magnetic core, filling the outer coil in a magnetic body of the outer body, and then forming a metal core wire of the insulating coil by spot welding or the like on the outer surface of the mold body And may be formed by attaching to external electrodes.

Since the cross-sectional area of the metal core of the insulating coil protruding outward by the insulating sheath is small, the area of electrical contact with the external electrode is inevitably small. As a result, the electrical contact resistance is increased, There is a problem that the reliability of contact is low.

In addition, the magnetic core and the mold main body have a semi-conductive property. When the main body is molded for winding the insulation coil on the core or for embedding the core in the mold main body, the insulation coating constituting the insulation coil is torn The current flowing through the metal core wire of the insulation coil leaks.

Particularly, when a high current is leaked through the semi-conductive mold body, plating may spread along the surface of the mold body during electroplating to form a plating layer on the outer surface of the outer electrode, and the leakage current itself may adversely affect the characteristics of the inductor .

It is an object of the present invention to provide a surface mount type inductor capable of reducing electrical contact resistance between a metal core of an inner insulating coil and an outer electrode and capable of providing reliable electrical contact.

Another object of the present invention is to provide a surface mount type inductor having a large inductance value.

It is another object of the present invention to provide a surface mount type inductor capable of flowing a high current.

Another object of the present invention is to provide a surface mount type inductor which is easy to be plated without generating a leakage current.

Another object of the present invention is to provide a surface mount type inductor capable of preventing a leakage of current to the outside even if a coating of an insulation coil is broken.

Another object of the present invention is to provide a manufacturing method which can economically and efficiently produce the surface mount type inductor.

The above object can be achieved by a magnetic material core; An insulating coil wound on an outer surface of the core; A mold main body comprising a soft magnetic metal molded body containing the core and the insulating coil so as to be embedded therein, the soft magnetic metal powder having an end portion of the insulating coil protruded on opposite sides of the core; And an outer electrode which is formed on an opposite side surface of the mold body and is electrically connected to the metal core of the end portion of the protruding insulating coil, And the outer electrode is electrically connected to the exposed metal core member.

Preferably, the core is composed of a ferrite sintered body formed by pressing a ferrite powder having magnetic properties and then firing, or a soft magnetic metal formed body formed by powder pressing and thermosetting a magnetic soft magnetic metal powder.

Preferably, the ferrite powder and the soft magnetic metal powder may be coated or contained with a heat resistant polymer resin.

Preferably, the insulating coil is formed by coating the metal core with an insulating polymer resin having heat resistance, and the insulating polymer resin is removed by the physical force to expose the metal core.

Preferably, the external electrode is formed by curing an electrically conductive epoxy paste adhesive, and nickel and tin are sequentially plated on the electrically conductive epoxy paste adhesive.

Preferably, a heat-resisting insulating coating layer is formed on the outer surface of the mold body, and the heat-resisting insulating coating layer may be formed of glass or a heat-resisting polymer resin.

Preferably, the metal core is folded, stretched or compressed by the physical force.

Preferably, the end of the insulating coil is brought into close contact with the mold body by the physical force, and the physical force may be at least one of polishing and grinding.

Preferably, the metal core material is exposed by the end of the protruded insulating coil by the physical force to increase the contact area with the external electrode, so that the electrical contact resistance between the external electrode and the metal core material is reduced, Reliability increases.

Preferably, the mold body is thermally cured, and the thermosetting may increase the mechanical strength.

Preferably, the inductor may be a power inductor.

The above object is achieved by a method of manufacturing a magnetic recording medium, comprising the steps of: forming a core by pressing a powder of magnetic material; Baking or thermosetting the core; Winding an insulating coil on an outer surface of the core; Forming a mold body by inserting the core in which the insulation coil is wound into a mold jig and applying a soft magnetic metal powder so that the insulation coil and the core are embedded and the end of the insulation coil is protruded; Polishing or grinding the mold body; And forming an external electrode on an opposite side surface of the mold body so as to be electrically connected to a metal core of an end portion of the insulating coil, wherein an end of the insulating coil is polished and polished Wherein the metal core material is exposed to the outside and the external electrode is electrically connected to the exposed metal core material.

The above object is achieved by a method of manufacturing a magnetic recording medium, comprising the steps of: forming a core by pressing a powder of magnetic material; Baking or thermosetting the core; Winding an insulating coil on an outer surface of the core; Forming a mold body in which the insulation coil and the core are embedded by inserting the core in which the insulation coil is wound into a mold jig and applying a soft magnetic metal powder; A tip protruding from a side surface of the mold main body and having a tip at which an end of the insulation coil is positioned and separated from the mold main body so that an end of the insulation coil protrudes; Polishing or grinding the mold body; And forming an external electrode on an opposite side surface of the mold body so as to be electrically connected to a metal core of an end portion of the insulating coil, wherein an end of the insulating coil is polished and polished Wherein the metal core material is exposed to the outside and the external electrode is electrically connected to the exposed metal core material.

Preferably, the mold body may be ground in a ball-mill to grind the outer surface or grind using a grinding roll.

Preferably, the insulating coil includes an insulating polymer resin covering the metal core, and the insulating polymer resin is removed from the end of the insulating coil by the grinding or the grinding to expose the metal core.

Preferably, the metal core is folded, stretched, or compressed by softening or grinding.

Preferably, the end of the insulating coil is brought into close contact with the mold body by the lengthening or the grinding.

Preferably, the method further comprises thermally curing the mold body, wherein the mold body is mechanically increased in strength by the curing.

Preferably, the step of forming the mold body may further include forming an insulating coating layer on the outer surface of the mold body.

Preferably, the mold body is formed by powder pressing a soft magnetic metal powder coated with a polymer resin, or by potting a liquid polymer resin containing soft magnetic metal powder, or by pelletizing a soft magnetic metal powder- And may be formed by injection molding.

According to the above structure, the end portion of the insulation coil protruding outside the mold body can be deformed by a physical force to expose the metal core member to the outside. Therefore, it is possible to increase the surface area of the metal core material, which is in electrical contact with the external electrode, by adjusting the length of the end of the protruding insulation coil, thereby reducing the electrical contact resistance between the metal core material of the insulation coil and the external electrode, Can be provided.

Further, by using a ferrite sintered body having a high magnetic permeability as an internal core, the inductance value of the inductor can be increased, and a high current can be passed.

Further, at least an insulating coating layer is formed on the outer surface of the outer mold body, so that it is easy to perform plating without generating a leakage current.

In addition, it is possible to economically and efficiently produce a surface mount type inductor having reduced electrical contact resistance between the metal core of the insulating coil and the external electrode and having reliable electrical contact.

1 is an external view showing a surface mount type inductor of the present invention.
2 is a sectional view taken along line 2-2 in Fig.
3 is a flow chart illustrating a method of manufacturing a surface mount type inductor according to the present invention.
4 is a manufacturing process diagram.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will now be described in detail with reference to the accompanying drawings.

FIG. 1 is an external view showing a surface mount type inductor of the present invention, and FIG. 2 is a sectional view taken along line 2 - 2 of FIG.

As shown, the surface-mount type inductor may be a power inductor and includes a magnetic core 10, an insulating coil 20 wound around the outer surface of the core 10, a magnetic body 10 for accommodating the core 10 and the insulating coil 20 The mold body 30 and the external electrode 40 formed on the opposite side surfaces of the mold body 30 and electrically connected to the insulation coil 10, respectively.

Hereinafter, each component will be described in detail.

≪ Core (10) >

The core 10 may be composed of a soft magnetic metal molded body having magnetic properties or a ferrite sintered body having magnetic properties. The soft magnetic metal formed body can be formed by powder-pressing a metal powder having soft magnetic properties and thermosetting it, and the ferrite sintered body can be formed by powder-pressing a ferrite powder having magnetic properties, followed by firing.

Here, the soft-magnetic metal compact in which the soft-magnetic metal powder is powder-pressed so that the soft-magnetic metal compact has sufficient mechanical strength can be thermoset at about 160 ° C.

The finally formed ferrite sintered body and the soft magnetic metal compact are semiconductive with approximately 10 ⁴ to 10 ⁹ Ω.

In the case of using the ferrite sintered body as the core 10, since the permeability of the ferrite sintered body is generally higher than that of the soft-magnetic metal molded body manufactured using the soft magnetic metal powder, the inductor can have a high value of inductance. As a result, there is an advantage that the same inductance value can be obtained even if the insulating coil 20 is wound on the core 10 less than the case where the soft magnetic metal formed body is applied to the core 10. [ With this principle, when the ferrite sintered body is used as the core 10 and the ferrite sintered body has the same inductance value, the inductor can reduce the insulation coil, and as a result, the metal core 21 having a large diameter can be used, .

Here, the soft magnetic metal powder having magnetic properties and the ferrite powder having magnetic properties are generally well-known magnetic materials. For example, the soft magnetic metal powder may be a permalloy metal powder, an amorphous metal powder, or a sandstone powder, and the ferrite powder may be a Ni-Mn powder.

Further, the ferrite powder and the soft magnetic metal powder may be coated or contained a heat-resistant polymer resin, for example, an epoxy resin or a silicone rubber, which can satisfy soldering conditions.

According to an embodiment of the present invention, an insulating coating layer 12 may be formed on the outer surface of the core 10 by coating an insulating glass or a polymer resin such as epoxy resin or parylene resin having heat resistance have.

In particular, when the core 10 is a soft magnetic metal mold, it is coated with a heat-resistant polymer resin, and the polymer resin has heat resistance capable of withstanding the soldering temperature.

2, a portion of the insulating coating which contacts the core 10 in the insulating coating constituting the insulating coil 20 is torn and the metal core 21b exposed to that portion is torn off from the core 10, The leakage current does not flow through the semi-conductive core 10 by the insulating coating layer 12 even if a current flowing through the insulating coil 20 is leaked.

Besides the parylene resin, beta-polyvinylidene fluoride, polyimide and the like can be used.

<Insulation Coil 20>

The insulated coil 20 means a wire wound with a structure in which an electrically conductive metal core 21 is wrapped with an insulating sheath 22, for example, an enamel wire having heat resistance capable of withstanding the soldering temperature can be used.

As is well known, enameled wire is an insulated wire which is thinly coated with heat-resistant insulating polymer resin on its surface, and has a characteristic that insulating coating layer is thin, high insulating property and not easily denatured to chemicals.

In this embodiment, the enamel wire is exemplified as the insulating coil 20, but it is not limited thereto.

2, the insulation coil 20 is composed of a metal core 21 and an insulation sheath 22 surrounding the metal core 21, and the diameter of the insulation coil 20 may be about 0.03 mm to 0.3 mm.

The material of the metal core 21 serving as an electric pathway may be copper or copper alloy which is well elongated, that is, has good ductility and is excellent in electric conductivity.

Since the insulation coating 22 is used for maintaining electrical insulation between the metal core members 21, it is not only electrically insulative but also heat resistant. The degree of heat resistance is sufficient to withstand soldering. As the insulating cloth 22, for example, a polyester resin, a polyimide resin, or the like can be used.

The metal core 21 is electrically connected to the external electrode 40, as will be described later.

The insulating coating 22 protruding outside the mold body 30 is removed by external physical force such as grinding or grinding which will be described later so that the metal core 21 is exposed, The metal core 21 is exposed by the length of the insulation coil 20 so that the area of the metal core 21 which ultimately contacts the external electrode 40 is increased.

In addition, the surface area can be increased when the metal core 21 is bent by the physical force and brought into close contact with the mold main body 30 or when the metal core 21 is stretched.

As a result, the external electrode 40 can be reliably contacted with the metal core 121 over a wider area, thereby reducing the electrical contact resistance and providing reliable electrical contact.

&Lt; Mold main body 30 >

The mold body 30 surrounds the core 10 and the insulation coil 20 so as to be embedded therein.

The mold main body 30 may be constituted by a soft magnetic metal compact formed by powder-pressing or molding the soft magnetic metal powder. The soft magnetic metal compact may be manufactured by the following method.

1) A soft magnetic metal powder coated with a polymer resin such as epoxy resin or silicone rubber having heat resistance can be formed by powder pressing and selectively curing.

2) A pellet wrapped with a soft magnetic metal powder in a polymer resin is injected into a mold, injection molded, and cured.

3) The soft magnetic metal powder is uniformly dispersed in the liquid polymer resin, mixed, and then potted and cured to form a mold.

The curing can be carried out by thermal curing at about 150 ° C to 250 ° C for about 10 minutes to about 2 hours, and the cured body 30 has sufficient mechanical strength.

The mold body 30 is semiconductive with approximately 10 ⁴ to 10 ⁹ ohms.

The outer surface of the mold body 30 made of the soft magnetic metal molded body may be coated with the polymer resin used for the insulating coating layer 12 of the core 10 to form the insulating coating layer 32.

2, the insulation coating constituting the insulation coil 20 is torn to expose the metal core 21a to the outside, so that a current flowing in the insulation coil 20 flows through the mold body 30 The current does not leak to the outer surface of the mold main body 30 by the insulating coating layer 32 even if it flows.

Even when the metal core 21b is exposed to the outside and current flowing in the insulating coil 20 flows through the core 10 and the mold body 30, Current does not leak to the outside.

As a result, it is possible to prevent the plating from spreading along the surface of the mold main body 30 when electrolytic plating is performed to form a plating layer on the outer surface of the external electrode 40 to be described later, and the characteristics of the inductor It is possible to prevent deterioration.

The insulating coating layer 32 may be formed to surround the entire outer surface of the mold body 30 and the thickness of the insulating coating layer 32 formed on the upper surface and the lower surface of the mold body 30 may be smaller than the thickness of the insulating coil 20 may be thicker than the thickness of the insulating coating layer 32 on the protruding side. This is because a polishing or grinding step is performed to remove the insulating coating 22 of the insulating coil 20 from the side where the insulating coil 20 protrudes as described later, .

The insulating coating layer 32 formed on the mold body 30 has heat resistance such that it can withstand the soldering temperature as the insulating coating layer 12 of the core 10.

As the polymer resin used for the insulating coating layer 32, β-polyvinylidene fluoride, polyimide and the like may be used in addition to the epoxy resin or parylene in the same manner as the core 10.

&Lt; External electrode (40) >

Preferably, the outer electrode 40 may be composed of nickel and tin plated on a heat-resistant electrically conductive epoxy paste adhesive in which a metal powder such as silver is mixed with an epoxy adhesive.

For example, the outermost layer of the external electrode 40 formed on both sides of the mold body 30 may be a plated tin layer.

The outer electrode 40 is formed by coating an electrically conductive epoxy paste adhesive on both sides of the mold main body 30 by dipping and then thermally curing the mold at about 250 ° C to form the metal core 121 of the insulation coil 20, And is electrically and reliably connected to the metal core 121.

Here, the electrical contact resistance between the outer electrode 40 and the metal core 121 is preferably as small as possible, and the outer electrode 40 and the metal core 121 must be electrically connected reliably even when an impact is applied. That is, a large area of the metal core 121, which can be electrically connected with a small and reliable electrical contact resistance, must be in contact with the outer electrode 40. [

 As described above, since the metal core 121 of the insulation coil 20 protruding from both sides of the mold main body 30 is directly in electrical contact with the conductive epoxy constituting the external electrode 40, The metal core 121 is electrically connected to the conductive epoxy by the curing of the conductive epoxy without any other connecting means, which is advantageous in that the production is easy and the manufacturing cost is low.

The metal core 121 of the insulation coil 20 protruding from both sides of the mold main body 30 is completely covered with the outer electrode 40. Therefore, when the inductor finished product is viewed from the outside, The insulation coil 20 is not seen at all and only the mold main body 30 and the external electrode 40 are seen and the metal core 121 does not protrude at all and reliability is good.

In addition, since the external electrodes 40 are formed symmetrically on both sides of the mold body 30, as compared with the case where the external electrodes 40 are formed on both sides of the upper surface and the lower surface, The better the soldering strength.

Hereinafter, a method for manufacturing the surface mount type inductor according to the present invention will be described with reference to FIGS.

3 is a flow chart for explaining a method of manufacturing a surface mount type inductor according to the present invention, and FIG. 4 is a manufacturing process diagram.

First, the core 10 is formed by a powder press (step S31).

Specifically, a soft magnetic metal powder coated with an epoxy resin or a silicone rubber is put into a mold, powder pressed and then thermally cured at about 160 ° C to prepare a core 10, or a ferrite powder is put into a mold, And the core 10 is formed.

Alternatively, an insulating coating layer 12 may be formed on the outer surface of the core 10, for example, parylene may be deposited using a deposition method. That is, if a certain amount of the core 10 is placed in the barrel cylinder and the barrel is rotated while introducing the vaporized parylene into the barrel, the core 10 is mixed and uniformly coated. Unlike this example, in the case of glass, the insulating coating layer 12 can be formed using a dipping method.

Both ends of the coil 20 extend a little longer from the core 10 and are protruded outside of the mold body 30 by a predetermined length as will be described later (step S32) .

The core 10 in which the coil 20 is wound is placed in the mold jig and aligned (step S33).

The mold jig is formed with a cavity having a shape corresponding to the mold body 30. Preferably, the cavity includes a tip 34, which surrounds both ends of the insulation coil 20 protruding outside of the mold body 30, May be provided.

Next, the cavity of the mold jig is filled with soft magnetic metal powder coated with an epoxy resin or a silicone rubber, and the mold body 30 is formed by powder pressing (step S34). After the powder press, the mold body 30 is optionally thermally cured at 160 DEG C for about 1 hour.

As a result, as shown in Fig. 4 (a), tips 34 are protruded from both sides of the mold main body 30, and the ends of the insulating coil 20 are embedded in the tips 34. [

4 (b), the protruding tip 34 is cut (step S35) so that the tip 34 is separated from the mold body 30 and is insulated from both sides of the mold body 30 The coil 20 protrudes.

As described above, since the tip 34 can be selectively formed, the cutting step S35 can be omitted.

Thereafter, a heat-resistant polymer resin is selectively applied to the outer surface of the mold main body 30 to form an insulating coating layer 32 (step S36).

4 (c), the insulating cover 22 protruding from the side surface of the mold body 30 is polished or ground by grinding to remove the insulating cover 22 of the insulating coil 20, so that the metal core 121 (Step S37).

That is, when the insulating coating layer 32 is not formed, the mold body 30 can be polished by putting it into a ball-mill, and when the insulating coating layer 32 is formed, Both sides of the base 30 can be ground.

In this process, the insulating cover 22 of the insulating coil 20 is removed by polishing or grinding, and the metal core 121 is exposed to the outside. In other words, the metal core 121 is bent by the soft deformation and is brought into close contact with the side surface of the mold main body 30 by polishing or grinding. In this state, the grinding or grinding progresses so that the mold main body 30 becomes the support body, 30 is removed by polishing or grinding so that the metal core 121 is exposed.

In the process of grinding or grinding, the metal core 121 may be stretched or squeezed by ductile deformation, for example, stretching. In this case, the surface area of the metal core 121 may be further increased.

As a result, the area of the metal core 121 contacting the external electrode 40 is increased, so that the electrical contact resistance can be reduced and the reliability of electrical contact can be improved.

In the polishing or grinding process of step S37, a part of the insulating coating layer 32 formed on the side surface of the mold body 30 may be removed and the thickness thereof may be thinned.

In this embodiment, polishing and grinding are described as an example. However, the present invention is not limited thereto, and the protruding portion of the insulating coil 20 may be burned or chemically treated to remove the insulating coating 22. In this case, too, the residual insulating coating 22 or the insulating coating 22 and the insulating coating layer 32 are removed or impurities are removed, and the metal core 121 is deformed and deformed so as to be brought into close contact with the mold body 30 A polishing or grinding process can be performed.

Next, as shown in FIG. 4 (d), a heat-resistant electrically conductive epoxy resin is applied to the side surface including the protruded metal core 121 by dipping and thermally cured at about 250 ° C. to form the external electrode 40 S38).

Nickel or tin may be further sequentially plated on the external electrode 40 to facilitate reflow soldering by the solder cream.

As a result, the contact resistance is reduced because the external electrode 40 is electrically contacted with the insulating coil 20 reliably over a wider area by the exposed and exposedly deformed metal core 121.

According to the surface mounted inductor manufactured as described above, since the external electrode is reliably and electrically contacted over a larger area by the metal core material of the insulation coil protruded from the mold body and deformed elastically, the electric contact resistance is reduced Reliable electrical contact can be provided.

Further, when a ferrite sintered body having a high magnetic permeability is used as the core, a coil having a high inductance and having a large diameter can be used, which is advantageous in that a large current can flow when the ferrite sintered body has the same inductance.

In addition, an insulating coating layer is formed on the outer surface of the semiconductive core and the outer surface of the mold body to prevent the current flowing in the insulating coil from leaking to the outer surface of the mold body due to breakage of the insulating coil.

In addition, since the insulating coating layer is formed on the outer surface of the semiconductive molded body to prevent the spreading phenomenon during plating for forming the external electrode, the leak current does not occur in the mold body, There is no abnormality.

On the other hand, in the above manufacturing method, it is possible to efficiently produce the surface mount type inductor in which the electrical contact resistance between the metal core of the insulating coil and the external electrode is reduced.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. Accordingly, the scope of the present invention should not be construed as being limited to the embodiments described above, but should be construed in accordance with the following claims.

10: Core
12: Insulation coating layer
20: Insulation coil
21, 21a, 21b, 121: metal core material
22: Insulation cloth
30: Mold body
32: Insulation coating layer
34: Tip
40: external electrode

Claims (22)

A core made of a magnetic material;
An insulating coil wound on an outer surface of the core;
A mold main body comprising a soft magnetic metal molded body containing the core and the insulating coil so as to be embedded therein, the soft magnetic metal powder having an end portion of the insulating coil protruded on opposite sides of the core; And
And external electrodes formed on the opposite side surfaces of the mold body and electrically connected to metal core members of the protruding insulating coil,
Wherein the end of the protruded insulating coil is exposed to the outside by a physical force and the external electrode is electrically connected to the exposed metal core. The method according to claim 1,
Wherein the core is composed of a ferrite sintered body formed by pressing a ferrite powder having magnetic properties and then firing or a soft magnetic metal molded body formed by powder pressing and thermosetting a magnetic soft magnetic metal powder. Mounting type inductor. The method of claim 2,
Wherein the ferrite powder and the soft magnetic metal powder are coated or contained with a heat resistant polymer resin. The method according to claim 1,
Wherein the insulating coil is formed by coating the metal core with an insulating polymer resin having heat resistance,
And the insulating polymer resin is removed by the physical force to expose the metal core. The method according to claim 1,
Wherein the external electrode is formed by curing an electroconductive epoxy paste adhesive, and nickel and tin are sequentially plated on the electroconductive epoxy paste adhesive. The method according to claim 1,
Wherein a heat-resistant insulating coating layer is formed on an outer surface of the mold body. The method of claim 6,
Wherein the heat-resistant insulating coating layer is made of glass or a heat-resistant polymer resin. The method according to claim 1,
Wherein the metal core member is deformed by a physical force such that the metal core member is bent, stretched, or compressed. The method according to claim 1,
And the end portion of the insulating coil is brought into close contact with the mold body by the physical force. The method according to claim 1,
Wherein the physical force is at least one of polishing and grinding. The method according to claim 1,
The metal core material is exposed to the end portion of the protruded insulation coil by the physical force to increase the contact area with the external electrode, thereby reducing the electrical contact resistance between the external electrode and the metal core material, And the surface-mount type inductor. The method according to claim 1,
Wherein the mold body is thermally cured and the mechanical strength is increased by the thermosetting. The method according to claim 1,
Wherein the inductor is a power inductor. Pressing a powder of a magnetic substance material to form a core;
Baking or thermosetting the core;
Winding an insulating coil on an outer surface of the core;
Forming a mold body by inserting the core in which the insulation coil is wound into a mold jig and applying a soft magnetic metal powder so that the insulation coil and the core are embedded and the end of the insulation coil is protruded;
Polishing or grinding the mold body; And
And forming an external electrode on an opposite side surface of the mold body so as to be electrically connected to a metal core material at an end of the insulating coil,
Wherein a metal core of an end portion of the insulating coil is exposed to the outside and an external electrode is electrically connected to the exposed metal core by the polishing and grinding at the end portion of the insulating coil . Pressing a powder of a magnetic substance material to form a core;
Baking or thermosetting the core;
Winding an insulating coil on an outer surface of the core;
Forming a mold body in which the insulation coil and the core are embedded by inserting the core in which the insulation coil is wound into a mold jig and applying a soft magnetic metal powder;
A tip protruding from a side surface of the mold main body and having a tip at which an end of the insulation coil is positioned and separated from the mold main body so that an end of the insulation coil protrudes;
Polishing or grinding the mold body; And
And forming an external electrode on an opposite side surface of the mold body so as to be electrically connected to a metal core material at an end of the insulating coil,
Wherein a metal core of an end portion of the insulating coil is exposed to the outside and an external electrode is electrically connected to the exposed metal core by the polishing and grinding at the end portion of the insulating coil . 15. The method according to claim 14 or 15,
Wherein the mold body is ground in a ball-mill to grind the outer surface or grind using a grinding roll. 15. The method according to claim 14 or 15,
Wherein the insulating coil is provided with an insulating polymer resin covering the metal core and the insulating polymer resin is removed from the end of the insulating coil by the polishing or grinding to expose the metal core. A method of manufacturing an inductor. 15. The method according to claim 14 or 15,
Wherein the metal core is folded, stretched or compressed by abrasion or grinding. &Lt; RTI ID = 0.0 &gt; 21. &lt; / RTI &gt; 15. The method according to claim 14 or 15,
And the end of the insulating coil is brought into close contact with the mold body by the lengthening or the grinding. 15. The method according to claim 14 or 15,
Further comprising the step of curing the mold body by heat, wherein the mold body is mechanically increased in strength by the curing. 15. The method according to claim 14 or 15,
Further comprising the step of forming an insulating coating layer on the outer surface of the mold body after the step of forming the mold body. 15. The method according to claim 14 or 15,
The mold body may be formed by powder pressing the soft magnetic metal powder coated with the polymer resin or by potting a liquid polymer resin containing the soft magnetic metal powder or by injection molding a pallet containing the soft magnetic metal powder Wherein the surface-mount type inductor is formed on the surface of the substrate.

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