KR102286623B1 - Coil component and method of manufacturing the same - Google Patents

Abstract

An objective of the present invention is to provide a coil component, which has excellent structural stability, and a manufacturing method thereof. The coil component (10) comprises: a coil (120); a main body (100) having a core insertion hole (111) penetrating through both sides; a terminal (150) that is provided to protrude downward from both sides of the main body (100) and are electrically connected to the coil (120); a pair of cores (200a and 200b) fitted into the core insertion hole (111) on both sides of the main body (100) and formed a closed loop by jointing together the faced opposite ends.

Description

Coil component and method of manufacturing the same

The present invention relates to a coil component and a method for manufacturing the same, and more particularly, to a coil component applied to an electric and electronic device and a method for manufacturing the same.

When a current flows into an electric/electronic device, an electric field and a magnetic field are induced around the current, and the electric field created by the potential difference changes with time and a magnetic field is generated around it. That is, regardless of the device's intention, current flows and unnecessary energy, electromagnetic noise, is generated.

When the noise generated in this way is transmitted to other devices through the transmission path, it may cause degradation of performance or malfunction. Although the recent rapid development of semiconductor technology and digital technology has achieved ultra-small, high-density and high-speed components, when current and voltage change within a short period of time, the noise becomes very large, and at the same time, it is sensitive to noise, such as showing a sensitive reaction with unnecessary energy radiated to the outside. had a drawback.

As a transmission path of noise, there are radiated noise transmitted to the air by electromagnetic waves, etc., inductive noise transmitted by electromagnetic induction electrostatic induction, and conducted noise transmitted through signal lines or power lines.

In order to reduce conduction noise transmitted through a signal line or a power line, a filter in which a coil is wound around a toroidal core is applied to a signal line or a power line in an electrical and electronic device.

However, since the conventional filter has a circular core, automatic winding is difficult, and for a safe distance between the coils, the size of the circular core must be increased to increase the volume. In many cases, two or more filters are used depending on the circuit. Since the volume is further increased, there is a problem in that it is difficult to miniaturize the electrical and electronic devices.

Registered Patent Publication No. 0799340 (Registered on Jan. 23, 2008)

An object of the present invention is to be used as a line filter that removes noise by inducing a magnetic field by winding a coil around a core, and it is easy to manufacture, can be miniaturized, has excellent insulation performance, and has excellent structural stability, and manufacturing thereof to provide a way

A coil component according to an embodiment of the present invention for solving the above problems includes a body including a coil and having a core insertion hole penetrating on both sides thereof, and a terminal provided to protrude to the lower portions of both sides of the body and electrically connected to the coil and a pair of cores fitted into the core insertion holes from both sides of the body and having opposite ends joined to each other to form a closed loop.

The main body includes a base bobbin including the core insertion hole and the winding portion, a coil wound on the winding portion of the base bobbin, and the coil so that an end of the coil is drawn out of the body and the core insertion hole is left while surrounding the coil. and an injection unit coupled to the base bobbin and the coil except for the core insertion hole and injected.

The winding part may include a first winding part, a second winding part, a third winding part, and a fourth winding part which are partitioned by a plurality of partition walls formed at regular intervals around the outer periphery of the base bobbin.

The partition wall dividing the second winding part and the third winding part may be a double partition wall having a shape spaced apart from each other by a predetermined interval so as to form mountains and valleys.

The partition wall dividing the first winding part and the second winding part and the partition wall dividing the third winding part and the fourth winding part may have recessed grooves for moving the coil to the adjacent winding part.

The base bobbin includes a first base bobbin and a second base bobbin, and the first base bobbin and the second base bobbin are arranged side by side after winding of the coil and are integrated by the injection unit.

The winding portion includes a first winding portion, a second winding portion, a third winding portion, and a fourth winding portion partitioned by a plurality of partition walls formed at regular intervals around the first base bobbin and the second base bobbin, respectively. and the coil includes a first coil wound around a first winding unit and a second winding unit of the first base bobbin, a second coil wound around a third winding unit and a fourth winding unit of the first base bobbin, and the It may include a third coil wound around the first winding unit and the second winding unit of the second base bobbin, and a fourth coil wound around the third winding unit and the fourth winding unit of the second base bobbin.

An "L"-shaped support protrusion may be protruded from the outer edge of the core insertion hole in the main body.

The pair of cores are two U-shaped, and ends facing each other may be joined by an adhesive.

A method of manufacturing a coil component includes the steps of forming a base bobbin including a core insertion hole and a winding part by primary injection, winding a coil on a winding part of the base bobbin, and wrapping the coil wound around the base bobbin. forming a body in which the base bobbin, the coil, and the injection part are coupled by secondary injection of the injection part into the base bobbin so that the end of the is drawn out and the core insertion hole is left; forming and joining the opposite ends by inserting the U-shaped core into the core insertion hole at both sides of the main body.

In the step of forming the base bobbin including the core insertion hole and the winding portion by performing the primary injection, a plurality of partition walls are formed around the outer periphery of the base bobbin at predetermined intervals so that the winding portion is a first winding portion and a second winding portion , to be partitioned into a third winding portion and a fourth winding portion.

In the step of forming the base bobbin including the core insertion hole and the winding portion by performing the primary injection, the partition wall dividing the second winding portion and the third winding portion is formed as a double partition wall, and the first winding portion and the second winding portion are formed as a double partition wall. Concave grooves are formed in the partition wall dividing the second winding part and the partition wall partitioning the third winding part and the fourth winding part.

In the step of winding the coil on the winding part of the base bobbin, a first coil is wound on the first winding part with a predetermined number of turns, and then the first coil is passed over the second winding part with a predetermined number of turns, and the third coil is wound with a predetermined number of turns. After winding the second coil with a predetermined number of turns on the winding unit, the second coil is passed to the fourth winding unit to be wound with a predetermined number of turns.

In the step of forming the body in which the base bobbin, the coil, and the injection unit are coupled, two base bobbins on which the coils are wound are prepared, the coils wound on the two base bobbins are arranged side by side, and the secondary injection is performed. The injection part makes the two base bobbins integrated.

Prior to joining the opposite ends by inserting the U-shaped core into the core insertion hole on both sides of the body, glass polishing the end of the U-shaped core and glass polishing of the U-shaped core and applying an adhesive to one end.

Since the present invention has a structure in which the core is coupled after winding the coil on the outer periphery of the base bobbin in the longitudinal direction, automatic winding is possible. can be easily changed, so it is possible to change the start and end of the circuit according to the customer's circuit configuration request.

In addition, the present invention has the effect that the number of turns of the coil can be uniformly wound and the partition wall can be used to adjust the frequency by winding the coil as much as necessary by placing a barrier rib in the winding section and then winding the remaining coils.

In addition, since the present invention is manufactured in a 2in1 structure in which two sets of coil units are included in one coil component, the number of components is reduced and the design is facilitated when designing a noise attenuation circuit, and the volume and area of the product are reduced to reduce the PCB (PCB) ), there is an effect that an area reduction design is possible.

1 is a perspective view showing a coil component according to an embodiment of the present invention.
2 is a perspective view showing a coil component according to an embodiment of the present invention.
3 is a plan perspective view of the main body according to an embodiment of the present invention, showing a state before the core is coupled to both sides of the core insertion hole.
4 is a cross-sectional view taken along line AA of FIG. 2 .
5 is a perspective view showing a base bobbin according to an embodiment of the present invention from the front.
6 is a perspective view showing the base bobbin according to the embodiment of the present invention from the bottom.
7 is a perspective view showing a state in which a coil is wound on a base bobbin according to an embodiment of the present invention.
8 is a perspective view showing a coil wound on the base bobbin according to an embodiment of the present invention and before injection.
9 is a perspective view showing a state in which the main body is formed by secondary injection into the two base bobbins of FIG. 8 according to an embodiment of the present invention.
10 and 11 show an example in which a coil component according to an embodiment of the present invention is installed in a power line and applied as a line filter.
12 is a perspective view and a plan view of a coil component according to another embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a perspective view showing a coil component according to an embodiment of the present invention, FIG. 2 is a perspective view showing a coil component according to an embodiment of the present invention, and FIG. 3 is a plan perspective view of the main body according to an embodiment of the present invention, both sides It is a diagram showing the state before the core is coupled to the core insertion hole.

1 and 2 , the coil component 10 according to the embodiment of the present invention includes a body 100 and a core 200 coupled to the body 100 .

The body 100 is formed in a substantially flat hexahedral shape and includes a coil 120 therein. The body 100 physically winds the coil 120 tightly and electrically insulates it from the outside. The main body 100 includes a terminal 150 connected to the coil 120 to the outside. The terminals 150 are provided to protrude downward from both sides of the main body 100 and are electrically connected to the coil 120 .

The main body 100 is formed with core insertion holes 111 penetrating on both sides.

Referring to FIG. 3 , a pair of cores 200 is inserted into the core insertion hole 111 at both sides of the body 100 , and ends facing each other in the core insertion hole 111 are joined to each other. Specifically, the pair of cores 200 are two U-shaped, and ends of the cores 200 facing each other are joined by an adhesive to form a closed loop. When the ends of the two U-shaped cores 200 contact each other to form a closed loop, the magnetic flux formed therebetween rides the core 200 and forms a magnetic path.

The adhesive bonding the ends of the core 200 is an epoxy-based adhesive, preferably a special epoxy-based adhesive. Since a magnetic path is formed when two ends of the cores 200a and 200b are well joined to each other, it is important to properly join the ends of the cores 200a and 200b with an epoxy-based adhesive.

The cores 200a and 200b are fitted into the core insertion holes 111 on both sides of the main body 100 , and when the two ends are in good contact with each other, they are electromagnetically coupled to the coil 120 to form a magnetic path. The cores 200a and 200b are made of a ferromagnetic material to obtain a strong magnetic flux. The ferromagnetic material may be ferrite, preferably Mn-Zn ferrite.

Referring back to FIGS. 1 and 2 , in the main body 100 , “L”-shaped support protrusions 117 and 117 ′ are protruded from the outer edge of the core insertion hole 111 . The support protrusions 117 and 117 ′ support both sides and upper surfaces of the cores 200a and 200b exposed to the outside in a state in which the cores 200a and 200b are fitted into the core insertion hole 111 so that the cores 200a and 200b are formed. The state fitted to the body 100 is stably maintained. In addition, the support protrusions 117 and 117 ′ create an insulating distance between the cores 200a and 200b and the coil 120 to significantly improve insulation.

In addition, the main body 100 is formed with a lower flange 118' that further protrudes to both sides on the lower side. The bottom surfaces of the cores 200a and 200b exposed to the outside by being fitted into the core insertion hole 111 are seated and supported on the lower flange 118 ′. In addition, the terminal 150 connected to the coil 120 is disposed on the lower flange 118 ′ to maintain an insulating distance.

The above-described coil component 10 may be installed on the signal line or the power line to prevent noise emitted from the outside from entering the system via the signal line or the power line, or may serve as a line filter to remove the outgoing noise.

FIG. 4 is a cross-sectional view taken along line A-A of FIG. 2 .

3 and 4, the coil component 10 according to the embodiment of the present invention includes four coils in the body 100 and two coils 120a, 120b, 120c, and 120d. It is a 2in1 structure that shares the same cores 200a and 200b by forming one set each.

The coil component 10 having a 2in1 structure includes two line filters including two coils in the body 100 so that one coil component 10 performs the functions of two line filters. Usually, two or more line filters are used between two signal lines as needed. If two line filters are used in one circuit, the volume and area of the electric and electronic equipment can be reduced, so that the PCB (PCB) Area reduction design is possible.

The coil 120 is wound around the base bobbin 110 and is included in the body 100 . For the 2in1 structure, two base bobbins 110 are used. The base bobbin 110 includes a first base bobbin 110a and a second base bobbin 110b, and the first base bobbin 110a and the second base bobbin 110b are arranged side by side after the coil 120 is wound. and integrated by the ejection unit 130 .

In the embodiment, the first coil 120a and the second coil 120b are wound around the first base bobbin 110a, and the third coil 120c and the fourth coil 120d are wound around the second base bobbin 110b. It is wound. The first coil 120a and the second coil 120b wound on the first base bobbin 110a become one set of line filters, and the third coil 120c and the fourth coil wound on the second base bobbin 110b are wound on the second base bobbin 110b. The coil 120d becomes one set of line filters, so that a total of two line filters are included in one coil component 10 . The first coil 120a and the second coil 120b share the same core 200a and 200b, and the third coil 120c and the fourth coil 120d share the same core 200a and 200b. .

Since the ends of the two cores 200a and 200b are substantially joined to form one core 200, the first coil 120a to the fourth coil 120d can be viewed as sharing the same core 200. In addition, even if the four coils 120 share the same core 200 , they are applied to adjacent signal lines and do not significantly affect the filter characteristics. Of course, it is also possible to form a set between the four coils in a different way depending on the design.

One end and the other end of the first coil 120a and one end and the other end of the third coil 120c protrude from one side of the lower portion of the main body 100, and one end and the other end of the second coil 120b and the fourth coil 120d) One end and the other end of the main body 100 protrude to the lower side of the other side to form a terminal, respectively. In the embodiment, since there are four coils 120 , eight terminals 150 are provided.

As shown in FIG. 4 , the body 100 includes a base bobbin 110 , a coil 120 , and an injection unit 130 .

The base bobbin 110 is formed with a core insertion hole 111 into which the cores 200a and 200b are fitted and a winding portion 113 on which the coil 120 is wound. The core insertion hole 111 is formed to pass through the longitudinal center of the base bobbin 110 , and the winding part 113 is formed in a shape surrounding the outer periphery of the core insertion hole 111 to form a coil in the core insertion hole 111 . When the 120 is coupled, the cores 200a and 200b are positioned between the coils 120 wound on the winding unit 113 . The inlet of the core insertion hole 111 is inclined upward to facilitate the fitting of the cores 200a and 200b. The base bobbin 110 is formed of an insulating material. Specifically, the base bobbin 110 is formed of a plastic injection molding material.

The injection unit 130 surrounds the coil 120 while the end of the coil 120 is drawn out of the body 100 and the core insertion hole 111 is left in the base bobbin 110 except for the core insertion hole 111 . ) and the coil 120 is coupled to the injection. The injection unit 130 physically tightly winds the coil 120 and electrically insulates it from the outside. When the injection part 130 is formed by injecting the remaining parts except for the core insertion hole 111 into which the cores 200a and 200b are inserted, the coil 120 must not be exposed to the outside to improve insulation properties.

The injection part 130 is injection molded to expose the end of the coil 120 from both sides of the base bobbin 110, and is thinly injected in the winding part (113 in FIG. 5) so as not to expose the coil 120 to the outside. injection molded. Since the injection part 130 secures insulating properties without significantly increasing the height of the base bobbin 110 , it can contribute to component miniaturization. The injection unit 130 is formed of a plastic injection material in the same manner as the base bobbin 110 .

Figure 5 is a perspective view showing the base bobbin according to the embodiment of the present invention from the front, Figure 6 is a perspective view showing the base bobbin according to the embodiment of the present invention from the bottom, Figure 7 is the base bobbin according to the embodiment of the present invention It is a perspective view showing the state in which the coil is wound.

5 to 7 , in the base bobbin 110 , a core insertion hole 111 is formed to pass through the center in the longitudinal direction, and a plurality of partition walls 115 are formed around the outer periphery at regular intervals. The plurality of partition walls 115 divide the winding portion 113 into a plurality of pieces.

In the embodiment, the winding part 113 is divided into a first winding part 113a, a second winding part 113b, a third winding part 113c, and a fourth winding part 114d by a partition wall 115 .

The partition wall 115a dividing the second winding part 113b and the third winding part 113c is a double partition wall having a shape that is spaced apart from each other by a predetermined distance so that mountains and valleys are formed. The double barrier rib secures an insulation distance (m) between the coil 120a wound around the second winding unit 113 and the coil 120b wound around the third winding unit 113 to prevent a signal from bouncing. In plastic, a signal flows along the surface of the plastic, so if a curve using mountains and valleys is formed in the partition wall 115a that divides the second winding part 113 and the third winding part 113, the second winding part 113 ), an insulation distance between the coil 120a wound around the coil 120a and the coil 120b wound around the third winding unit 113 is increased. The winding part 113 is formed to have rounded corners based on the cross-section, so that the winding of the coil 120 is made more stably.

Although the embodiment has been described as an example of securing the insulation distance between the coil and the coil by using the double barrier ribs, the barrier ribs may be formed as triple or quadruple barrier ribs to secure the insulation distance.

A partition wall 115b dividing the first winding part 113a and the second winding part 113b and a partition wall 115b dividing the third winding part 113c and the fourth winding part 114d are adjacent winding parts. A concave groove 116 for moving the coil is formed.

When the coil 120 is wound over a large area, it is difficult to uniformly wind the coil. Accordingly, in the embodiment, a plurality of partition walls 115a and 115b are formed around the outer periphery of the base bobbin 110 to form the winding portion 113 with the first winding portion 113a, the second winding portion 113b, and the third winding. It is divided into a section 113c and a fourth winding section 114d, and the coil 120 is wound only as much as necessary for the partitioned winding section 113, and then crosses the partition wall 115b and moves to the next winding section 113. By winding the remaining coil 120 , the number of coil turns can be made uniform. In addition, a concave groove 116 is provided in the partition wall 115b so that the coil 120 is wound with a predetermined number of turns, and then can be easily moved to the next winding unit 113 .

The barrier rib 115 is convenient for winding the coil 120 around each winding unit 113a, 113b, 113c, and 113d, and since the frequency characteristics vary according to the arrangement and number of the barrier ribs 115, the number of barrier ribs 115 may be adjusted or the frequency characteristic may be adjusted through the presence or absence of the partition wall 115 .

The base bobbin 110 further includes both side partition walls 115c formed around both ends in the longitudinal direction. The both-side barrier ribs 115c are substantially barrier ribs forming the winding portion 113 . Lower flange portions 118 extending to both sides are formed in the lower portion of the both sides of the partition wall 115c, and coil withdrawal grooves 119 are formed in the lower surface of the lower flange portion 118 . The coil take-out groove 119 is formed in a shape that is opened downward and penetrates on both sides, so that the end of the coil 120 wound on the winding part 113 can be hung and drawn out.

5 and 7, a part of the first coil 120a is wound around the first winding unit 113a and the rest of the first coil 120a is wound around the second winding unit 113b, A portion of the second coil 120b is wound around the third winding unit 113c and the remainder of the second coil 120b is wound around the fourth winding unit 113d. The number of turns of the first coil 120a wound around the first winding unit 113a, the number of turns of the first coil 120a wound around the second winding unit 113b, and the number of turns of the first coil 120a wound around the second winding unit 113b The number of turns of the second coil 120b and the number of turns of the second coil 120b wound around the second winding unit 113b may be the same. 3 and 4 , the number of turns of the first coil 120a and the second coil 120b wound around the first winding unit 113a to the fourth winding unit 113d forms, for example, four layers. do.

One end and the other end 150a and 150a' of the first coil 120a wound across the first winding part 113a and the second winding part 113b are the lower flange part of one side of the base bobbin 110 ( One end and the other end of the second coil 120b hooked on the coil take-out groove 119 formed in 118 and drawn out, and wound over the third winding part 113c and the fourth winding part 113d, are The base bobbin 110 is hooked on the coil take-out groove 119 formed in the lower flange part 118 of the other side to be drawn out. One side and the other end of the first coil 120a hooked on the coil take-out groove 119 and drawn to the outside, and one side and the other end of the second coil 120b are dipped in a lead solution to make terminal pins, and It can be used as a terminal for connection.

8 is a perspective view showing a coil wound on the base bobbin according to an embodiment of the present invention and before injection. 9 is a perspective view showing a state in which the main body is formed by secondary injection into the two base bobbins of FIG. 8 according to an embodiment of the present invention.

8 and 9, the base bobbin 110 is composed of two of a first base bobbin 110a and a second base bobbin 110b, and a first base bobbin 110a and a second base bobbin. 110b is integrated by the injection unit 130 which is disposed next to each other after winding of the coil 120 and is secondarily injected.

The coil 120 includes a first coil 120a wound around the first winding unit 113a and the second winding unit 113b of the first base bobbin 110a, and a third winding of the first base bobbin 110a. The second coil 120b wound around the part 113c and the fourth winding part 113d, and the second coil 120b wound around the first winding part 113a and the second winding part 113b of the second base bobbin 110b. It includes a third coil 120c and a fourth coil 120d wound around the third winding unit 113c and the fourth winding unit 113d of the second base bobbin 110b.

The first base bobbin 110a and the second base bobbin 110b are formed with "L"-shaped support protrusions 117 and 117' on both sides. The support protrusions 117 and 117' formed on the first base bobbin 110a and the support protrusions 117 and 117' formed on the second base bobbin 110b are formed to face each other, so that the core is inserted into the first base bobbin 110a. The ball 111 and the outer protrusion of the U-shaped cores 200a and 200b fitted with the core insertion hole 111 of the second base bobbin 110b can be stably supported, and the cores 200a, 200b ) and the insulation distance between the coil 120 can also be secured.

The "L"-shaped support protrusions 117 and 117' formed on the first base bobbin 110a and the second base bobbin 110b are seen as protruding from the outer edge of the core insertion hole 111 in the main body 100 lose

As shown in FIG. 9 , the main body 100 wraps the coil 120 wound around the first base bobbin 110a and the second base bobbin 110b while the end of the coil 120 is drawn out and the core The insertion hole 111 is formed by injecting the injection part 130 into the first base bobbin 110a, the second base bobbin 110b, and the coil 120 except for the core insertion hole 111 to be left.

In the embodiment, one end 150a and the other end 150a' of the first coil 120a wound on the first base bobbin 110a are of the lower flange portion 118 of one side of the first base bobbin 110a. One end 150b and the other end 150b' of the second coil 120b protrude to the outside through the coil take-out groove 119, and the lower flange portion 118 of the other side of the first base bobbin 110a. It protrudes to the outside through the coil withdrawing groove 119 . In addition, one end 150c and the other end 150c' of the third coil 120c wound around the second base bobbin 110b are the coils of the lower flange portion 118 of one side of the second base bobbin 110b. It protrudes to the outside through the withdrawal groove 119, and the one end 150d and the other end 150d' of the fourth coil are the coil withdrawal grooves of the lower flange portion 118 of the other side of the second base bobbin 110b. 119) and protrude to the outside.

The end of each coil 120 protruding to the outside through the coil take-out groove 119 is withdrawn to the outside through the injection unit 130 during the secondary injection, and its position is fixed. When the injection unit 130 is coupled to the coil take-out groove 119, the coil take-out groove 119 becomes a terminal guide groove 119' for guiding the position of the terminal 150 to protrude to the lower part of the body 100. .

In addition, the end of each coil 120 is dipped with lead to become a terminal pin having a predetermined strength to serve as a terminal.

Two U-shaped cores 200a and 200b are coupled to the core insertion hole 111 that is opened to both sides of the main body 100, and the ends of the two U-shaped cores 200a and 200b have a core insertion hole. It is joined in (111) to form a closed loop, and four coils 120 are wound around the cores 200a and 200b, and when a current is generated, a magnetic circuit is formed.

Hereinafter, a method of manufacturing a coil component according to an embodiment of the present invention will be described.

As shown in FIGS. 6 and 9, the method of manufacturing a coil component includes the steps of forming the base bobbin 110 including the core insertion hole 111 and the winding part 113 by primary injection (FIG. 6); , winding the coil 120 on the winding part 113 of the base bobbin 110 ( FIG. 7 ), and the end of the coil 120 is outside while wrapping the coil 120 wound on the base bobbin 110 . By secondary injection of the injection part 130 into the base bobbin 110 so that the core insertion hole 111 is left, the base bobbin 110, the coil 120, and the injection part 130 are coupled to the main body ( The step of forming 100 ( FIG. 8 ), the step of forming the end of the coil 120 as the terminal 150 , and the U-shaped core 200a in the core insertion hole 111 at both sides of the body 100 . , 200b) by inserting each to join the opposite ends (FIG. 9).

In the step of forming the base bobbin including the core insertion hole and the winding part by primary injection, a plurality of partition walls 115 are formed at regular intervals around the outer periphery of the base bobbin 110 to form the winding part 113 in the first The winding portion 113a, the second winding portion 113b, the third winding portion 113c and the fourth winding portion 113d are partitioned.

In the step of forming the base bobbin including the core insertion hole and the winding part by primary injection, the partition wall dividing the second winding part 113b and the third winding part 113c is formed as a double partition wall to increase the insulation distance, , a coil wound with a predetermined turn on the partition wall 115 dividing the first winding part 113a and the second winding part 113b and the partition wall partitioning the third winding part 113c and the fourth winding part 113d. A concave groove 116 for moving the 120 to the next winding unit 113 is formed.

In the winding of the coil on the winding part of the base bobbin, the first coil 120a is wound on the first winding part 113a by a predetermined number of turns, and then the first coil 120a is passed to the second winding part 113b. A predetermined number of turns is wound, and the second coil 120b is wound on the third winding unit 113c with a predetermined number of turns, and then the second coil 120b is passed through the fourth winding unit 113d to be wound with a predetermined number of turns.

In the step of forming the body in which the base bobbin, the coil, and the injection unit are combined, two base bobbins 110 on which the coil 120 is wound are prepared, and the coils 120 wound on the two base bobbins 110 are arranged side by side. The two base bobbins 110 are arranged so that the injection unit 130 is coupled to the two base bobbins 110 and the coil 120 by secondary injection to integrate the two base bobbins 110 . The main body 100 is formed by integrating the two base bobbins 110 by coupling the injection part 130 to the two base bobbins 110 and the coil 120, excluding the core insertion hole 111 during the second injection. to form

In the step of forming the end of the coil 120 as the terminal 150, the end of the coil 120 is dipped in a lead solution to form a terminal pin. When the end of the coil 120 is dipped in a lead solution, the outer skin of the end of the coil 120 is dissolved in the lead, and the lead is attached to the copper wire without the outer skin, so it is easy to make a terminal pin. In addition, when the end of the coil 120 is dipped in a high-temperature lead solution, lead is attached to the copper wire and the copper wire has a predetermined strength. The end of the coil 120 is a material that can be attached to the copper wire while melting the outer shell in addition to high-temperature lead so that the copper wire has a predetermined strength, and various materials can be used as long as it has electrical conductivity. When the end of the coil 120 is made into a terminal pin and used as a terminal, a soldering operation for connecting the end of the coil to the terminal is not required, so a soldering defect problem is prevented and a connection defect problem is prevented.

A reinforcing pin for strength reinforcement may be bonded to the end of the coil 120 and then integrated by dipping in a lead solution.

Before the step of joining the opposite ends by inserting the U-shaped core into the core insertion hole on both sides of the body, glass polishing the ends of the U-shaped cores 200a and 200b and the U-shaped core and applying an adhesive to the glass polished end.

When the ends of the U-shaped cores 200a and 200b are glass-polished, they are in good contact with the ends of the counterpart cores 200a and 200b to optimize the ruler formation. That is, when the contact surfaces of the ends of the two cores 200a and 200b are in good contact with each other, the magnetic flux travels along the cores 200a and 200b to form a magnetic path. The U-shaped cores 200a and 200b are inserted into the core insertion hole 111 by applying an adhesive to the glass-polished ends so that the ends are well maintained in contact with the two cores 200a and 200b in the core insertion hole 111. ) so that the ends are joined. The coil component 10 finally manufactured by the above steps has a shape as shown in FIG. 1 .

Since the above-described coil component 10 has a structure in which the core is coupled after winding the coil 120 on the longitudinal outer periphery of the base bobbin 110, automated winding is possible, and productivity is higher compared to applying a conventional toroidal core. It is high, and the winding direction of the coil 120 can be easily changed, so that it is possible to change the start and end of the circuit according to the customer circuit configuration request.

In addition, in the above-described coil component 10 , it is easy to uniformly wind the number of turns of the coil 120 by partitioning the winding part 113 for winding the coil by partitioning the partition wall 115 , and depending on the presence or absence of the partition wall 115 . Since the frequency characteristics are different, the partition wall 115 may be provided and used to adjust the frequency. The resonant frequency (operating frequency) can be increased if the winding has a barrier rib.

In addition, the above-described coil component 10 uses four coils, and two coils are shared in one U-shaped core (200a, 200b) to constitute one set of coil units, and U-shaped cores (200a, 200b) are shared. ), it becomes a 2in1 structure in which 2 sets of coil units are included in one coil part. Since this is to manufacture two or more existing products into one product, it reduces the number of components and facilitates the design of the noise attenuation circuit (EMI block circuit).

The above-described coil component 10 may be used as a line filter. When the above-described coil parts are used as a line filter, one set of coil units becomes one line filter, and therefore two sets of coil units become two line filters. If two line filters are included in one coil component 10, the volume and area of the product can be reduced by about 47%, so that a PCB area reduction design is possible.

10 and 11 show an example in which a coil component according to an embodiment of the present invention is installed in a power line and applied as a line filter.

A circle indicated near the coil in FIGS. 10 and 11 indicates a direction in which the coil is wound.

As shown in FIG. 10 , the coil component 10 shares the first coil 120a and the second coil 120b with the core, and shares the third coil 120c and the fourth coil 120d with the core. Thus, by forming two sets of coil units, it becomes a structure in which two line filters are integrated into one product.

Since the above-described coil component 10 has a structure in which two line filters are integrated into one product, the product can be miniaturized, and as shown in FIG. 11 , the winding direction of the coil 120 can be easily changed. It is possible to change the start and end of the circuit according to the customer's circuit configuration request.

12 is a perspective view and a plan view of a coil component according to another embodiment of the present invention.

As shown in FIG. 12 , in another embodiment, the coil component 10-1 is provided with two coils 120, the first coil 120a being shared on one side of the U-shaped core, and the U-shaped coil on the other side. The second coil 120b may be shared on one side of the 120 . This structure can be applied when only one line filter is required.

Although the coil component 10 of the other embodiment described above is not illustrated, the injection part is coupled to the base bobbin 110 and the coil 120 to insulate the coil 120 as in the embodiment.

Although the embodiment and other embodiments of the present invention described above have been described with reference to the use of a line filter as an example, it is applicable to various coil parts used by winding a coil and inducing each other with the core, and is applicable to various home and electronic devices. In addition, the structure of the embodiment in which four coils are provided to have a 2in1 function is most preferable rather than a structure in which two coils are provided.

The coil component of the above-described embodiment is applicable to noise removal for high frequencies of several tens of kHz or higher. For example, the coil component of the above-described embodiment can be used as a noise filter for a frequency of 300 to 400 kHz.

BRIEF DESCRIPTION OF THE DRAWINGS The present invention is disclosed in the drawings and in the specification with preferred embodiments. Here, although specific terms have been used, they are used only for the purpose of describing the present invention and are not used to limit the meaning or the scope of the present invention described in the claims. Therefore, it will be understood by those skilled in the art that various modifications and equivalent other embodiments of the present invention are possible therefrom. Accordingly, the true technical scope of the present invention should be defined by the technical spirit of the appended claims.

10: coil part 100: body
110: base bobbin 111: core insertion hole
113: winding portion 113a ~ 113d: first winding portion ~ fourth winding portion
115, 115a, 115b, 115c: bulkhead 116: concave groove
117: support projection 118: lower flange portion
118': lower flange 119: coil lead-out groove
119': terminal guide grooves 110a, 110b: first and second base bobbins
120: coil 120a ~ 120d: first coil ~ fourth coil
130: injection unit 150: terminal
200,200a,200b: core

Claims (15)

delete delete delete delete delete delete delete delete delete forming a base bobbin including a core insertion hole and a winding part by primary injection;
winding a coil on a winding portion of the base bobbin;
The main body in which the base bobbin, the coil and the injection part are coupled by secondary injection of the injection part into the base bobbin so that the end of the coil is drawn out while surrounding the coil wound on the base bobbin and the core insertion hole is left. forming a;
forming an end of the coil as a terminal; and
inserting a U-shaped core into the core insertion hole at both sides of the main body and joining the opposite ends;
including,
The first injection to form a base bobbin including a core insertion hole and a winding part,
An "L"-shaped support protrusion is formed protruding from the outer edge of the core insertion hole,
The step of forming a body in which the base bobbin, the coil, and the injection unit are coupled,
Prepare two base bobbins on which coils are wound, and arrange the coils wound on the two base bobbins side by side so that the secondary injection part is integrated with the two base bobbins, and the injection part is the "L" A method of manufacturing a coil component in which the "L" shape faces symmetrically in the main body by leaving the supporting protrusion in the shape of a shape and injecting it. 11. The method of claim 10,
The first injection to form a base bobbin including a core insertion hole and a winding part,
A method of manufacturing a coil component in which a plurality of barrier ribs are formed around the outer periphery of the base bobbin at predetermined intervals so that the winding portion is divided into a first winding portion, a second winding portion, a third winding portion and a fourth winding portion. 12. The method of claim 11,
In the step of forming a base bobbin including a core insertion hole and a winding part by the first injection,
The partition wall dividing the second winding part and the third winding part is formed as a double partition wall,
A method of manufacturing a coil component in which a concave groove is formed in a barrier rib dividing the first winding unit and the second winding unit and dividing the third winding unit and the fourth winding unit. 12. The method of claim 11,
The step of winding the coil on the winding part of the base bobbin,
After winding a first coil with a predetermined number of turns on the first winding unit, passing the first coil to the second winding unit with a predetermined number of turns,
A method of manufacturing a coil component in which a second coil is wound with a predetermined number of turns in the third winding unit, and then the second coil is passed to the fourth winding unit and wound with a predetermined number of turns. delete 11. The method of claim 10,
Before the step of joining the opposite ends by inserting the U-shaped core into the core insertion hole on both sides of the main body,
glass polishing an end of the U-shaped core; and
applying an adhesive to the glass-polished end of the U-shaped core;
A method of manufacturing a coil component comprising a.

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