KR20220052727A - Coil component - Google Patents

Abstract

According to an aspect of the present invention, a coil component comprises: a mold unit having one side and the other side facing each other; a winding coil disposed on one surface of the mold unit; a core disposed at a central unit of one surface of the mold unit and penetrating the winding coil; a recess unit formed on one surface of the mold unit to surround the core; a shielding coil disposed inside the recessed unit; and a cover unit disposed on the mold unit and the winding coil.

Description

Coil Component {COIL COMPONENT}

The present invention relates to a coil component having an improved EMI shielding function.

Magnetic molds and wire-wound coils are sometimes used to manufacture coil components. The trend toward high-density mounting is changing due to the multi-functionality and compactness of electronic devices, which causes electromagnetic interference (EMI) noise between devices, and an EMI shielding function is required to remove it.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a coil component capable of improving the EMI shielding effect while reducing the thickness.

According to one aspect of the present invention, a mold part having one surface and the other surface facing each other; and a winding coil disposed on one surface of the mold part; a core disposed in the center of one surface of the mold part and passing through the winding coil; a receiving groove formed on one surface of the mold part to surround the core; a shielding coil disposed inside the receiving groove; and a cover part disposed on the mold part and the winding coil. A coil component comprising a is provided.

According to another aspect of the present invention, a mold part having one surface and the other surface facing each other;

a winding coil disposed on one surface of the mold part; a core disposed in the center of one surface of the mold part and passing through the winding coil; a receiving groove formed on one surface of the mold part; a shielding coil disposed between the core and the winding coil; and a cover part disposed on the mold part and the winding coil. Including, at least a portion of the shielding coil is disposed in the receiving groove,

The receiving groove is formed in at least a portion of an area surrounding the core among the one surface, the coil component is provided.

According to the present invention, it is possible to improve the EMI shielding effect while reducing the thickness of the coil component.

1 is a perspective view schematically showing a coil component according to a first embodiment of the present invention.
FIG. 2 is an exploded perspective view of FIG. 1 ;
3 is a perspective view specifically illustrating a mold part of the coil component according to the first embodiment of the present invention.
FIG. 4 is a top view showing a structure in which a shielding coil is disposed in the mold part of FIG. 3 .
FIG. 5 is a view showing a coil component according to a first embodiment of the present invention, and is a cross-sectional view corresponding to a cross-section taken along line I-I' of FIG. 1 .
6 is a perspective view schematically illustrating a coil component according to a second embodiment of the present invention.
7 is a perspective view specifically illustrating a mold part of a coil component according to a second embodiment of the present invention.
8 is a top view illustrating a structure in which a shielding coil is disposed in the mold part of FIG. 7 .
9 is a view showing a coil component according to a second embodiment of the present invention, and is a cross-sectional view corresponding to a cross-section taken along line I-I' of FIG. 1 .

The terms used in the present application are only used to describe specific embodiments, and are not intended to limit the present invention. The singular expression includes the plural expression unless the context clearly dictates otherwise. In the present application, terms such as “comprise” or “have” are intended to designate that a feature, number, step, operation, component, part, or combination thereof described in the specification exists, but one or more other features It should be understood that this does not preclude the existence or addition of numbers, steps, operations, components, parts, or combinations thereof. And, throughout the specification, "on" means to be located above or below the target part, and does not necessarily mean to be located above the direction of gravity.

In addition, the term "coupling" does not mean only when there is direct physical contact between each component in the contact relationship between each component, but another component is interposed between each component, so that the component is in the other component. It should be used as a concept that encompasses even the cases in which each is in contact.

Since the size and thickness of each component shown in the drawings are arbitrarily indicated for convenience of description, the present invention is not necessarily limited to the illustrated bar.

In the drawings, the L direction may be defined as a first direction or length direction, the W direction may be defined as the second direction or width direction, and the T direction may be defined as a third direction or thickness direction.

Hereinafter, a coil component according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. is to be omitted.

Various types of electronic components are used in electronic devices, and among these electronic components, various types of coil components may be appropriately used for the purpose of removing noise and the like.

That is, in electronic devices, the coil component is used as a power inductor, a high frequency inductor, a general bead, a high frequency bead (GHz Bead), a common mode filter, etc. can be

(Example 1)

1 is a perspective view schematically showing a coil component according to a first embodiment of the present invention, and FIG. 2 is an exploded perspective view of FIG. 1 . Meanwhile, FIG. 2 shows only the mold part 100 , the winding coil 300 , and the cover part 200 which are the main components for convenience of explanation.

1 and 2 , the coil component 1000 according to the first embodiment of the present invention includes a body B, a winding coil 300 , and external electrodes 400 and 500 . The body B includes a mold part 100 and a cover part 200 . The mold part 100 may include a support part 110 and a core 120 .

The body B forms the exterior of the coil component 1000 according to the present embodiment, and the winding coil 300 is embedded therein.

The body (B) may be formed in the shape of a hexahedron as a whole.

The body (B) is, based on FIGS. 1 and 2 , a first surface 101 and a second surface 102 facing each other in the longitudinal direction (L), and a third surface facing each other in the width direction (W). 103 and a fourth surface 104 , and a fifth surface 105 and a sixth surface 106 facing in the thickness direction T. Each of the first to fourth surfaces 101, 102, 103, and 104 of the body B is a wall surface of the body B that connects the fifth surface 105 and the sixth surface 106 of the body B corresponds to Hereinafter, both cross-sections of the body (B) mean the first surface 101 and the second surface 102 of the body (B), and both sides of the body (B) are the third surface ( 103) and the fourth surface 104 .

The body B is, for example, formed so that the coil component 1000 according to this embodiment in which external electrodes 400 and 500 to be described later are formed has a length of 2.0 mm, a width of 1.2 mm, and a thickness of 0.65 mm. may be, but is not limited thereto.

On the other hand, the body B includes a mold part 100 and a cover part 200, and the cover part 200 is disposed on the upper part of the mold part 100 with reference to FIG. surround the surface Accordingly, the first to fifth surfaces 101, 102, 103, 104, 105 of the body B are formed by the cover part 200, and the sixth surface 106 of the body B is formed by the mold part ( 100 ) and the cover part 200 .

The mold part 100 has one surface and the other surface facing each other. The mold part 100 includes a support part 110 and a core 120 . The support 110 supports the winding coil 300 . The core 120 is disposed in the central portion of one surface of the support 110 in the form of penetrating the winding coil 300 and the shielding coil 310 . For the above reasons, in the present specification, one surface and the other surface of the mold part 100 are used in the same meaning as the one surface and the other surface of the support part 110 , respectively.

The thickness dm of the support 110 may be 200 μm or more. When the thickness dm of the support 110 is less than 200 μm, it may be difficult to secure rigidity. The thickness of the core 120 may be 150 μm or more, but is not limited thereto.

The cover part 200 covers the mold part 100 and the winding coil 300 to be described later. The cover part 200 may be disposed on the support part 110 , the core 120 , and the winding coil 300 of the mold part 100 , and then pressurized to be coupled to the mold part 100 .

At least one of the mold part 100 and the cover part 200 includes a magnetic material. In this embodiment, both the mold part 100 and the cover part 200 include a magnetic material. The mold part 100 may be formed by filling a magnetic material in a mold for forming the mold part 100 . Alternatively, the mold part 100 may be formed by filling a mold with a composite material including a magnetic material and an insulating resin. A molding process of applying high temperature and high pressure to the magnetic material or composite material in the mold may be additionally performed, but is not limited thereto. The support 110 and the core 120 may be integrally formed by a mold. The cover part 200 may be formed by disposing a magnetic composite sheet in which a magnetic material is dispersed in an insulating resin on the mold part 100 and then heating and pressing.

The magnetic material may be ferrite or metallic magnetic powder.

Ferrite powder is, for example, spinel-type ferrites such as Mg-Zn, Mn-Zn, Mn-Mg, Cu-Zn, Mg-Mn-Sr, Ni-Zn, Ba-Zn, Ba It may be at least one of hexagonal ferrites such as -Mg-based, Ba-Ni-based, Ba-Co-based, and Ba-Ni-Co-based ferrites, garnet-type ferrites such as Y-based ferrites and Li-based ferrites.

Metal magnetic powder is made of iron (Fe), silicon (Si), chromium (Cr), cobalt (Co), molybdenum (Mo), aluminum (Al), niobium (Nb), copper (Cu) and nickel (Ni). It may include any one or more selected from the group consisting of. For example, the magnetic metal powder includes pure iron powder, Fe-Si alloy powder, Fe-Si-Al alloy powder, Fe-Ni alloy powder, Fe-Ni-Mo alloy powder, Fe-Ni-Mo- Cu alloy powder, Fe-Co alloy powder, Fe-Ni-Co alloy powder, Fe-Cr alloy powder, Fe-Cr-Si alloy powder, Fe-Si-Cu-Nb alloy powder, Fe- It may be at least one of Ni-Cr-based alloy powder and Fe-Cr-Al-based alloy powder.

The metallic magnetic powder may be amorphous or crystalline. For example, the magnetic metal powder may be a Fe-Si-B-Cr-based amorphous alloy powder, but is not necessarily limited thereto.

Each of the ferrite and the magnetic metal powder may have an average diameter of about 0.1 μm to 30 μm, but is not limited thereto.

Each of the mold part 100 and the cover part 200 may include two or more types of magnetic materials. Here, the different types of magnetic materials means that the magnetic materials are distinguished from each other by any one of an average diameter, composition, crystallinity, and shape.

The insulating resin may include, but is not limited to, epoxy, polyimide, liquid crystal polymer, etc. alone or in combination.

The winding coil 300 is embedded in the body (B) to express the characteristics of the coil component. For example, when the coil component 1000 of the present embodiment is used as a power inductor, the winding coil 300 stores an electric field as a magnetic field to maintain an output voltage, thereby stabilizing the power of the electronic device.

The winding coil 300 is disposed on one surface of the mold part 100 . Specifically, the winding coil 300 is wound around the core 120 and is disposed on one surface of the support 110 .

The winding coil 300 is an air-core coil, and may be composed of a flat coil. The winding coil 300 may be formed by winding a metal wire such as a copper wire whose surface is coated with an insulating material in a spiral shape.

The winding coil 300 may be composed of a plurality of layers. Each layer of the winding coil 300 is formed in a plane spiral, and may have a plurality of turns. That is, the winding coil 300 forms an innermost turn T1 , at least one intermediate turn T2 , and an outermost turn T3 from the central portion of one surface of the mold part 100 to the outside.

3 is a perspective view specifically illustrating a mold part of the coil component 1000 according to the first embodiment of the present invention.

As shown in FIGS. 2 and 3 , the support part 110 has a plurality of through-hole-shaped accommodating parts 110H penetrating the support part 110 , and the plurality of accommodating parts 110H includes first, second It includes second and third accommodating portions 111 , 112 , and 113 . In the present invention, both ends of the winding coil 300 may be disposed in the first and second accommodating parts 111 and 112, respectively, and in the third accommodating part 113, both ends of the shielding coil 310 to be described later. can be placed. On the other hand, the shape and formation position of the through-hole-shaped accommodation portion 110H may be arbitrarily changed. As a non-limiting example, unlike those shown in FIGS. 2 and 3 , the receiving part 110H may be formed to have a circular or elliptical cross-sectional shape.

Meanwhile, as shown in FIGS. 2 and 3 , in the case of the coil component 1000 according to the first embodiment, the recess 130 may be formed on one surface of the support 110 . The recess 130 may be formed in a region surrounding the core 120 among one surface of the support 110 , and extends from the region surrounding the core 120 to the third accommodating part 113 . It may be formed by extending. As a result, the recess 130 and the third accommodating part 113 may be integrally formed.

A depth of the recess 130 may be substantially the same as a diameter of a shielding coil 310 to be described later. Therefore, after the shielding coil 310 is disposed in the recess 130 , even if the winding coil 300 is disposed, the winding coil 300 is disposed in the support part 110 without the recess 130 . and the height of the winding coil 300 in the final structure may be the same.

In addition, the width of at least a portion of the region surrounding the core 120 among the recessed portions 130 may be substantially the same as the diameter of the shielding coil 310 . As a result, when the winding coil 300 is disposed, the innermost turn of the winding coil may be disposed on the recess 130 and the shielding coil 310 .

In addition, although not shown, both ends of the winding coil 300 may be disposed on the side surface of the support part 110 and exposed to the other surface of the support part 110 . At this time, a groove-shaped accommodating part 110H for accommodating both ends of the winding coil 300 may be formed on the side surface of the support part 110 , but is not limited thereto.

FIG. 4 is a top view showing a structure in which a shielding coil is disposed in the mold part of FIG. 3 .

As shown in FIG. 4 , in the coil component 1000 according to the first embodiment of the present invention, the shielding coil 310 may be disposed prior to the disposition of the winding coil 300 .

The shielding coil 310 may include the same material as the winding coil 300 , but is not limited thereto. The shielding coil 310 is embedded in the body B, and may be connected to a ground electrode 600 to be described later. The shielding coil 310 may perform a function of shielding electromagnetic interference (EMI) generated when the coil component characteristic of the winding coil 300 is expressed.

In addition, in the case of the present invention, the depth of the recess 130 may be substantially the same as the diameter of the shielding coil 310 , so that even after the shielding coil 310 is disposed, one surface of the support 110 is maintained flat. can be, it is possible to prevent distortion or loosening when the winding coil 300 is disposed.

As can be seen from FIG. 4 , the shielding coil 310 is disposed along the recessed portion 130 , and both ends of the shielding coil 310 may pass through the molded portion 100 through the third receiving portion 113 . can Therefore, it has a structure in which both ends of the shielding coil 310 are exposed to the other surface of the mold part 100 , and both ends of the shielding coil 310 exposed are disposed below the third receiving part 113 to be described later. It may be connected to the ground electrode 600 .

The ground electrode 600 may serve as a ground, so a separate signal transmission function may not be performed, and an EMI shielding function may be improved.

5 is a view showing a coil component according to a first embodiment of the present invention, and is a cross-sectional view corresponding to a cross-section taken along line I-I' of FIG. 1 .

In the case of FIG. 5, a part of the middle turn of the winding coil 300 shown in FIG. 1 is omitted and illustrated, and FIG. 9 is also the same.

As shown in FIG. 5 , the shielding coil 310 is disposed in the recess portion 130 , and both ends pass through the third receiving portion 113 to be exposed to the other surface of the support portion 110 , and the exposed An end of the shielding coil 310 may be connected to the ground electrode 600 .

In addition, both ends of the winding coil 300 also pass through the first and second receiving portions 111 and 112 to be exposed to the other surface of the support portion 110 , that is, the sixth surface 106 of the body B. Both ends of the winding coil 300 exposed to the other surface of the support 110 are respectively connected to the first and second external electrodes 400 and 500 spaced apart from each other on the other surface of the support 110 .

Both ends of the winding coil 300 are exposed to the other surface of the support 110 . As described above, as shown in FIGS. 2 and 3 , the support part 110 has a plurality of through-hole-shaped accommodating parts 110H penetrating the support part 110 , and the second part of the accommodating part 110H is formed. Both ends of the winding coil 300 may be respectively disposed in the first and second receiving portions 111 and 112 . On the other hand, the shape and formation position of the through-hole-shaped accommodation portion 110H may be arbitrarily changed. As a non-limiting example, the receiving portion 110H may be formed to have a circular or elliptical cross-sectional shape.

As another example, although not shown, both ends of the winding coil 300 may be disposed on the side surface of the support part 110 and exposed to the other surface of the support part 110 . At this time, the first and second accommodating parts 111 and 112 in the form of grooves for accommodating both ends of the winding coil 300 may be formed on the side surface of the support part 110 , but the present invention is not limited thereto.

The first and second external electrodes 400 and 500 are spaced apart from each other on the sixth surface 106 of the body B, that is, the other surface of the support 110 , and are respectively connected to both ends of the winding coil 300 . do.

In addition, the ground electrode 600 is also disposed on the sixth surface 106 of the body B, that is, the other surface of the support part 110, and is spaced apart from each of the first and second external electrodes 400 and 500 to shield it. It is connected to both ends of the coil 310 .

The first and second external electrodes 400 and 500 and the ground electrode 600 may be formed in a single-layer or multi-layer structure. For example, the first and second external electrodes 400 and 500 and the ground electrode 600 are disposed on a first layer including copper (Cu) and the first layer and include a second layer including nickel (Ni). layer, and a third layer disposed on the second layer and including tin (Sn). The first and second external electrodes 400 and 500 and the ground electrode 600 may be formed by electroplating, but are not limited thereto.

The first and second external electrodes 400 and 500 and the ground electrode 600 are formed of copper (Cu), aluminum (Al), silver (Ag), tin (Sn), gold (Au), nickel (Ni), It may be formed of a conductive material such as lead (Pb), chromium (Cr), titanium (Ti), or an alloy thereof, but is not limited thereto.

Meanwhile, although not shown in the drawings, the coil component 1000 according to the present embodiment includes the first and second external electrodes 400 and 500 and the ground electrode 600 among the sixth surface 106 of the body B. An insulating layer disposed in an area other than the disposed area may be further included. The insulating layer may be used as a plating resist in forming the first and second external electrodes 400 and 500 and the ground electrode 600 by electroplating, but is not limited thereto. Also, the insulating layer may be disposed on at least a portion of the first to fifth surfaces 101 , 102 , 103 , 104 , and 105 of the body B .

In addition, although not shown, a groove portion R may be formed between the first and second external electrodes 400 and 500 and the ground electrode 600 on the other surface of the mold part 100 , that is, on the other surface of the support part 100 . there is.

The groove portion R may prevent unnecessary removal of plating resist necessary for forming the first and second external electrodes 400 and 500 and the ground electrode 600 by electroplating. That is, in order to form the plating of the first and second external electrodes 400 and 500 and the ground electrode 600 , a plating resist including an opening corresponding to the external electrode and the ground electrode forming region is applied to the sixth body (B) of the body (B). It is formed on the surface 106 , and when an opening is formed by polishing or the like, a region other than the external electrode formation region may be removed, and the groove portion R is for preventing this. For the above reasons, an insulating layer such as a plating resist may be disposed in the groove portion R.

In this way, the coil component 1000 according to the present embodiment can prevent plating spread when the first and second external electrodes 400 and 500 and the ground electrode 600 are formed by electroplating.

(Second embodiment)

6 is a perspective view schematically showing a coil component according to a second embodiment of the present invention, and FIG. 7 is a perspective view showing a mold part of the coil component of FIG. 6 in detail.

1 to 7 , the coil part 2000 according to the present embodiment has a recess 130 formed in the mold part 100 when compared to the coil part 1000 according to the first embodiment of the present invention. And the arrangement structure of the shielding coil 310 is different. Therefore, in describing the present embodiment, only the recessed portion 130 and the shielding coil 310 different from the first embodiment will be described. For the rest of the configuration of the present embodiment, the description in the first embodiment of the present invention may be applied as it is.

7 , in the case of the mold part 100 of the coil component 2000 according to the second embodiment, a recess 130 may be formed on one surface of the support part 110 . The recess 130 may be formed in a portion of the region surrounding the core 120 among one surface of the support part 110 , and may be formed at one end of the region surrounding the core 120 . It may be formed to extend to the receiving part 113 . As a result, the recess 130 and the third accommodating part 113 may be integrally formed. A depth of the recess 130 may be substantially the same as a diameter of the shielding coil 310 .

8 is a top view showing a structure in which a shielding coil is disposed in the mold part of FIG. 7 .

As shown in FIG. 8 , in the case of the coil component 2000 according to the second embodiment, the shielding coil 310 may be disposed to surround the core 120 . In the second embodiment, one end of the shielding coil 310 is preferentially disposed toward the upper portion of the core 120 in the vicinity of the center of the core 120 , and then the core 120 from the upper portion toward the lower portion of the core 120 . ) may be arranged in a form that encloses the Through the above structure, the shielding coil 310 may be disposed having a plurality of turns, and one end of the shielding coil 310 is covered by the plurality of turns, so that the shielding coil 310 is not unwound. It can keep its wrapped shape. The structure of the coil component 2000 according to the second specific embodiment may refer to FIG. 9 .

9 is a view showing a coil component according to a second embodiment of the present invention, and is a cross-sectional view corresponding to a cross-section taken along line I-I' of FIG. 1 .

The shielding coil 310 descends from the top of the core 120 toward the bottom to surround the core 120 , and then at least a portion of a turn closest to the bottom of the core 120 is in the recess 130 . can be placed. In the case of the coil component 2000 according to the second embodiment, the recess 130 is not formed to surround the entire circumference of the core 120 , but surrounds only a partial area around the core 120 among one surface of the support unit 110 , can be formed. The shielding coil 310 is disposed in the recessed portion 130 formed around the core 120 in this way, and disposed up to the region where the recessed portion 130 and the third receiving portion 113 are connected, resulting in shielding. The other end of the coil 310 may pass through the mold part 100 through the third accommodating part 113 to be exposed to the other surface of the mold part 100 . The other end of the shielding coil 310 exposed in this way is connected to the ground electrode 600 to improve the EMI shielding effect.

Unlike the first embodiment in which the shielding coil 310 is disposed under the core 120 in a single layer, in the second embodiment, the shielding coil 310 has a multi-layered structure, has a plurality of turns, and the core 120 Since the area of the shielding coil 310 adjacent to the winding coil 300 may increase compared to the first embodiment, it may be more advantageous for EMI shielding. In addition, as shown in FIG. 9, the EMI shielding effect increases due to an increase in the number of turns in the T-direction, that is, in the thickness direction of the shielding coil 310, while maintaining a single turn on the LW plane (horizontal direction). Since the core 120 has a structure that surrounds the core 120 from the upper part to the lower part, it is possible to stably implement a wound-type inductor without interfering with arranging the winding coil 300 thereafter.

In the above, although various embodiments of the present invention have been described, those of ordinary skill in the art can add, change or delete components within the scope that does not depart from the spirit of the present invention described in the claims. Various modifications and variations of the present invention will be possible, which will also be included within the scope of the present invention.

100: mold part
110: support
110H: receptacle
111, 112, 113: first to third accommodating parts
120: core
200: cover part
300: winding coil
310: shielding coil
400, 500: external electrode
600: ground electrode
B: body
1000, 2000: coil parts

Claims (10)

a mold part having one surface and the other surface facing each other;
a winding coil disposed on one surface of the mold part;
a core disposed in a central portion of one surface of the mold unit and passing through the winding coil;
a recess portion formed on one surface of the mold portion to surround the core;
a shielding coil disposed inside the recess; and
a cover part disposed on the mold part and the winding coil; A coil component comprising:
According to claim 1,
first and second external electrodes spaced apart from each other on the other surface of the mold part; and
a ground electrode spaced apart from each of the first and second external electrodes on the other surface of the mold part; Further comprising, a coil component.

3. The method of claim 2,
First and second accommodating parts for accommodating both ends of the winding coil are formed on one surface of the mold part,
Both ends of the winding coil are exposed to the other surface of the mold part through the first and second accommodating parts so as to be connected to the first and second external electrodes, respectively.

4. The method of claim 3,
A third accommodating part for accommodating the shielding coil is formed on one surface of the mold part,
Both ends of the shielding coil are exposed to the other surface of the mold part through the third accommodating part so as to be connected to the ground electrode.
According to claim 1,
a depth of the recess is substantially equal to a diameter of the shielding coil.
According to claim 1,
The winding coil is an innermost turn (turn) outward from the central portion of one surface of the mold portion, at least one
forming an intermediate turn and an outermost turn,
The recess portion is disposed under the innermost turn (turn) of the winding coil, coil component.
a mold part having one surface and the other facing each other;
a winding coil disposed on one surface of the mold part;
a core disposed in a central portion of one surface of the mold unit and passing through the winding coil;
a recess formed on one surface of the mold part;
a shielding coil disposed between the core and the winding coil; and
a cover part disposed on the mold part and the winding coil; includes,
At least a portion of the shielding coil is disposed in the recess,
The recess portion is formed in at least a portion of a region surrounding the core among one surface of the mold portion.
8. The method of claim 7,
At least a portion of the shielding coil is disposed so as to surround the core and one end of the shielding coil.
9. The method of claim 8,
first and second external electrodes spaced apart from each other on the other surface of the mold part; and
a ground electrode spaced apart from each of the first and second external electrodes on the other surface of the mold part; Further comprising, a coil component.
10. The method of claim 9,
The other end of the shielding coil,
A coil component that penetrates through the mold part so as to be connected to the ground electrode and is exposed to the other surface of the mold part.

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