JPH04368106A - Inductor and manufacture thereof - Google Patents

Abstract

PURPOSE:To restrain leakage magnetic flux, enhance magnetic characteristics, and improve productivity, by constituting an inductor of a core body made of magnetic material, a coil, and a case body made of magnetic material which accommodates the coil. CONSTITUTION:A core body 22 is formed by using a rectangular plate type substrate 24 and ferrite having a coil winging protrusion 31 of a columnar type which protrudes in a unified body from the almost central part of the upper surface part 25 of the substrate 24. A pair of nearly U-shaped electrode parts 33 is formed on both end portions 32 of the substrate part 24. A winding wire 36 is wound around the coil winding protrusion 31, and a coil 41 is formed. Each end portion 42 of the winding wire 36 is electrically connected with the upper surface of each electrode 33 by soldering or the like. A case body 44 constituted of ferrite is bonded and fixed to an upper surface part 25 of the substrate part 24. The coil 41 is accommodated in an accommodation cart 45 of the case body 44. Thereby leakage magnetic flux generated from the coil 41 can be restrained.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inductor and a method of manufacturing the same, and more particularly to a magnetically shielded chip inductor used in mobile communication devices, video tape recorders, computers, etc. and a method of manufacturing the same.

0002

2. Description of the Related Art Conventionally, as shown in FIG. 7, an inductor of this kind is constructed by fitting a drum-shaped core 2 around which a coil 1 is wound into a ferrite case 3 for suppressing leakage magnetism. ing.

[0003] The drum-shaped core 2 has a cylindrical coil-wound part 5 and a disk-shaped flange part 7 on each end of which an electrode part 6 is formed. A winding wire 8 is wound around this coil winding portion 5 to enclose the coil 1, and both ends 9 of this winding wire 8 are electrically connected to each electrode portion 6, respectively.

The ferrite case 3 is made of prismatic ferrite, and a fitting hole 11 into which the drum-shaped core 2 is fitted is formed so as to pass through both end surfaces 12. Further, electrode portions 15 are integrally formed on both end surfaces 12, the outer surface 14, and the vicinity of both end surfaces 12 inside the engagement hole 11, and when the drum-shaped core 2 is fitted, the electrode portions 15 are formed integrally with each other. The portion 6 and the electrode portion 15 are in contact with each other and are electrically connected.

[0005] When the drum-shaped core 2 is fitted into the ferrite case 3, soldering is performed to securely connect and fix the two, and in order to protect both end faces 12, both end faces 12 are A sealing layer (not shown) is formed on the surface.

[0006]

[Problems to be Solved by the Invention] However, according to the inductor having the above-mentioned conventional structure, the drum-shaped core 2
Both flanges 7 and the fitting hole 1 of the ferrite case 3
1 requires high-precision machining. Further, electrode portions 6 and 15 are formed at each end of the drum-shaped core 2 and the ferrite case 3, and these electrode portions 6 and 1
This method requires steps such as soldering and forming a sealing layer after fitting 5, which poses a problem in that the production efficiency of the inductor is poor.

[0007] Furthermore, according to the inductor having the conventional structure described above, since the electrode portions 6 having a large area are formed at both ends of the coil 1, there is also a problem that the magnetic properties are deteriorated.

[0008] The present invention has been made in view of the above points, and an object of the present invention is to provide an inductor that can suppress leakage magnetism, have improved magnetic properties, and improve production efficiency, and a method for manufacturing the same. .

[0009]

[Means for Solving the Problems] An inductor according to the invention as set forth in claim 1 includes a core body made of a magnetic material having a substrate portion and a coil winding protrusion protruding from the upper surface of the substrate portion;
a pair of electrode parts formed on the substrate part; a winding wire wound around the coil winding protrusion to form a coil, each end of which is electrically connected to each of the electrode parts; A case body made of a magnetic material is attached to the substrate part and houses the coil in a housing part.

The method for manufacturing an inductor according to the second aspect of the present invention provides a core made of a magnetic material having a substrate portion on which a pair of electrode portions are formed, and a coil winding protrusion protruding from the upper surface of the substrate portion. A case body made of a magnetic material, in which a winding wire is wound around the winding protrusion to form a coil, and each end of the winding wire is electrically connected to each of the electrode parts. is attached to the core body, and the coil is housed in the housing portion of the core body.

[0011]

In the inductor according to the first aspect of the invention, since the coil is housed in the housing portion of the case body made of a magnetic material, leakage magnetism generated from the coil is suppressed by the case body. Additionally, there are fewer electrical connections, increasing reliability. Furthermore, the structure is simple and production efficiency is increased.

[0012] The method for manufacturing an inductor according to the second aspect of the present invention suppresses leakage magnetism, makes it possible to easily manufacture an inductor with high electrical reliability, and increases production efficiency.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure of an embodiment of the inductor of the present invention will be described below with reference to the drawings.

In FIGS. 1 and 6, 21 is an inductor, and this inductor 21 is a chip-shaped inductor mounted on a circuit board (not shown).

1 and 3, reference numeral 22 denotes a core body, which is made of a magnetic material such as ferrite, and includes a rectangular plate-shaped substrate portion 24 and an upper surface portion of this substrate portion 24. It consists of a cylindrical coil winding protrusion 31 integrally protruding from approximately the center of 25.

A pair of substantially U-shaped electrode portions 33, 33 are integrally formed at both ends 32, 32 in the longitudinal direction of the substrate portion 24, extending from the upper surface portion 25 to the end surface portion and the lower surface portion, respectively. It is formed.

Further, in FIGS. 1 and 4, 36 is a winding wire, and this winding wire 36 has an insulating layer formed around a conductor in the center, and an adhesive layer formed around it. It is a self-welding wire. This winding wire 36 is wound around the coil winding protrusion 31 and fixed with an adhesive layer to form a coil 41, and each end portion 42, 42 of this winding wire 36 is They are electrically connected to the upper surfaces of the respective electrode parts 33, 33 by soldering or the like.

Furthermore, in FIGS. 1, 5 and 6, 4
4 is a case body, and this case body 44 is made of a magnetic material such as ferrite, has a substantially rectangular parallelepiped shape as shown in FIG. . As shown in FIG. 5, a housing part 45 is recessed and has a shape that allows the coil 41 and the coil winding protrusion 31 to be stored without contacting each other, and the coil 41 is stored inside this housing part 45. are doing.

Note that each electrode section 33, 33 is connected to the substrate section 24.
It is also possible to integrally form both end portions 32, 32 of both side surface portions 47, 47, respectively, to form a substantially box shape.

Furthermore, a space 50 shown in FIG. 5 between the inner surface of the housing section 45 of the case body 44 and the coil 41 and core body 22 is filled with synthetic resin or the like to protect the coil and the winding wire. It is also possible to form a protective layer for

Next, a method of manufacturing the inductor 21 of this embodiment will be explained.

First, as shown in FIG. 2, an elongated rectangular ferrite plate 51 having coil winding protrusions 31 protrudingly provided at predetermined intervals is formed. A pair of substantially U-shaped electrode portion continuums 33a 1 and 33a 2 are integrally formed on both sides from the top surface to the end surface and the bottom surface.

Next, this ferrite plate 51 is cut at the positions shown by dotted lines in FIG. 2 to form individual core bodies 22 shown in FIG. 3.

Then, as shown in FIG. 4, a self-fusion type winding wire 36 is wound around the coil winding protrusion 31, a coil 41 is wound thereon, and each end 42 of the winding wire 36 is wound around the coil winding protrusion 31. ,4
2 is electrically connected to the upper surface of each electrode portion 33, 33 by soldering or the like.

Further, in this state, treatment with heat or alcohol is performed to activate the adhesive layer of the winding wire 36 and bond the coil 41 to the coil winding protrusion 31, as well as to bond the winding wire 36 to each other. Glue and secure so that it does not unravel.

Next, as shown in FIG.
The case body 44 having the housing 45 formed therein is arranged with the storage portion 45 facing upward. Then, the core body 22 with the coil winding protrusion 31 facing downward is inserted into the housing portion 45 from above, and the case body 44 and the substrate portion 24 are bonded and joined.

At this time, adhesive 53 is applied in advance to the upper surface of each electrode section 33, 33, the periphery of the upper surface 25 of the substrate section 24, or the periphery of the storage section 45 of the case body 44. put.

Also, at this time, by injecting synthetic resin or the like into the housing portion 45 in advance, the case body 4
A protective layer can be formed in the space 50 between the inner surface of the storage section 45 of No. 4 and the coil 41 and the core body 22.

Then, as shown in FIG. 6, the inductor 21 is turned upside down to obtain a completed inductor 21.

In the process shown in FIG. 2, before cutting the ferrite plate 51 to form the individual core bodies 22,
It is also possible to wind the coil 41 by winding the winding wire 36 around each coil winding protrusion 31 . Furthermore, the case body 44 can also be formed continuously like the core body 22. In this case, after bonding and joining the continuous body of the case body 44 to the ferrite plate 51 on which the coil 41 is wound around each coil winding protrusion 31, the ferrite plate 51 and the continuous body of the case body 44 are integrated. to form individual inductors 21.

According to the inductor 21 and the manufacturing method thereof of this embodiment, the substrate portion 2 made of ferrite is
2 and the case body 44 can cover the entire circumference of the coil 41, so leakage magnetism generated from the coil 41 can be suppressed.

Furthermore, since it is not necessary to arrange the electrode parts 33, 33 at both ends of the coil 41, and the area of the electrode parts 33, 33 can be reduced, the magnetic characteristics of the inductor 21 can be improved.

[0033]The electrical connection part is the winding wire 3
There are only two locations, each end 42, 42 of 6 and both electrode parts 33, 33, and the process of connecting multiple electrode parts to each other, which was necessary in the past, is no longer necessary, and the reliability of the electrical connection part is improved. You can increase your sexuality.

Furthermore, since the core body 22 and the case body 44 are fixed by adhesive, the steps of forming the drum-shaped core and the fitting hole with high precision or forming a protective layer on both end surfaces, which were conventionally necessary, are required. etc. are no longer required, and the inductor 21
assembly becomes easier and production efficiency can be increased.

[0035]

According to the inductor of the invention as set forth in claim 1, since the coil is housed in the housing portion of the case body made of a magnetic material, leakage magnetism generated from the coil can be suppressed by the case body. . Furthermore, there are fewer electrical connections, and the reliability of the electrical connections can be improved. Furthermore, the structure is simple and production efficiency can be improved.

According to the method for manufacturing an inductor according to the second aspect of the present invention, an inductor that suppresses leakage magnetism and has high electrical reliability can be easily manufactured, and production efficiency can be improved.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing an embodiment of an inductor of the present invention with a case body removed.

FIG. 2 is a perspective view showing the manufacturing process of the above inductor.

FIG. 3 is a perspective view showing the manufacturing process of the above inductor.

FIG. 4 is a perspective view showing the manufacturing process of the above inductor.

FIG. 5 is a cross-sectional view showing the manufacturing process of the same inductor as above.

FIG. 6 is a perspective view of the same inductor as above.

FIG. 7 is an exploded perspective view showing a conventional inductor.

[Explanation of symbols]

21 Inductor 22 Core body 24　　　　Base part 25 Top part 31 Coil winding protrusion 33 Electrode part 36 Winding wire 41 Coil 42 End 44 Case body 45 Storage section

Claims (2)

[Claims] 1. A core body made of a magnetic material having a substrate portion, a coil winding protrusion protruding from an upper surface of the substrate portion, a pair of electrode portions formed on the substrate portion, and the coil. a winding wire that is wound around the winding protrusion to form a coil, each end of which is electrically connected to each of the electrode parts;
An inductor comprising: a case body made of a magnetic material that is attached to the substrate part and houses the coil in a housing part. 2. A core body made of a magnetic material is formed, and has a substrate portion on which a pair of electrode portions are formed, and a coil winding protrusion protruding from the upper surface of the substrate portion, and the coil winding protrusion is attached to the coil winding protrusion. A winding wire is wound to form a coil, each end of the winding wire is electrically connected to each of the electrode parts, a case body made of a magnetic material is attached to the core body, and a case body made of a magnetic material is attached to the core body. A method for manufacturing an inductor, comprising storing the coil in a storage section.