JPH06188124A - Chip type inductor and manufacture thereof - Google Patents

Abstract

PURPOSE:To provide a column chip type inductor which can be manufactured by a comparatively easier method and has various inductance values. CONSTITUTION:An internal conductor 3 is provided from one end to the other end of a magnetic element assembly between layers of a magnetic layer 4 where the magnetic layer are laminated from the internal circumference side to the outer circumference side of the magnetic element assembly 1 and external electrodes 2, 2 are provided in both end portions of the magnetic element assembly 1 so that such external electrodes are connected to both end portions of the internal conductor 3. Such a chip type inductor can be formed by forming a linear conductor for two sides opposed with each other of the main surface of a rectangular magnetic sheet, then forming a column type magnetic element assembly 1 by winding such magnetic sheet from one side to the other side of the side crossing two sides opposed with each other and moreover, providing external electrodes 2, 2 to both end portions of the magnetic element assembly 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chip type in which an inner conductor is provided inside a cylindrical magnetic body, and external electrodes are provided at both ends of the magnetic body so as to be connected to both ends of the inner conductor. Indak and method for manufacturing it.

As conventional chip-type inductors, multilayer ceramic inductors, columnar chip-type inductors and the like are known. A laminated ceramic inductor forms a turn-shaped internal conductor between layers of laminated magnetic sheets,
External electrodes are provided at both ends of the laminated body so that these turn-shaped internal conductors are interlayer-connected by through holes or the like and are connected to the internal conductors at both ends thereof. In addition, the cylindrical chip-shaped inductor is formed by forming a conductor film on the outer periphery of a cylindrical ceramic body, trimming this conductor film in a spiral shape, and connecting both ends of the conductor film to both ends of the ceramic body. An external electrode is provided.

In the former monolithic ceramic inductor, it is necessary to print an internal conductor pattern on a thin magnetic ceramic green sheet, laminate the same, and cut it.
There is a problem in that it requires a high level of printing technology and layering technology, and it takes time to manufacture. Also, in the latter cylindrical chip-shaped inductor, since the conductor film formed on the outer periphery of the cylindrical ceramic body has to be spirally trimmed, precise trimming technology is required, which is also troublesome to manufacture. There were challenges. Therefore, an object of the present invention is to provide a cylindrical chip type inductor which can be manufactured by a relatively simple method and which can obtain various inductance values.

[0004]

[Means for Solving the Problems] That is, in order to achieve the above-mentioned object, the present invention has an inner conductor inside a cylindrical magnetic body, and the magnetic body is connected to both ends of the inner conductor. In a chip-shaped inductor having external electrodes provided on both ends of the body, a cylindrical magnetic body 1 composed of magnetic layers 4 laminated from the inner circumference to the outer circumference and a magnetic layer 4 constituting the magnetic body 1 are formed. Between the layers, there are internal conductors 3 formed over both ends of the magnetic element body 1, and external electrodes 2 and 2 provided on both ends of the magnetic element body 1 so as to be connected to both ends of the internal conductor 3, respectively. To provide a chip inductor.

Further, according to the present invention, a chip-type inductor having an inner conductor inside a cylindrical magnetic element and external electrodes provided on both ends of the magnetic element so as to be connected to both ends of the inner conductor is manufactured. In the method described above, the step of forming the rectangular magnetic sheet 14 and the inner conductor 3 are formed on at least one main surface of the magnetic sheet 14 over two opposite sides thereof.
And a step of forming a linear conductor 13 that becomes
By winding the magnetic sheet 14 having the above from one side of the side intersecting the two opposite sides to the other side,
Provided is a method for manufacturing a chip-type inductor, which comprises a step of forming a cylindrical magnetic element body 1 and a step of providing external electrodes 2, 2 on both ends of the magnetic element body 1.

[0006]

In the chip-type inductor according to the present invention, the inner conductor 3 is provided between both ends of the magnetic body 1 between the magnetic layers 4 laminated from the inner circumference to the outer circumference of the magnetic body 1. Since the external electrodes 2 and 2 are provided at both ends of the magnetic body 1 so as to be connected to both ends thereof, an inductance can be obtained between both external electrodes 2 and 2.

Further, in the method of manufacturing a chip inductor according to the present invention, the magnetic element body 1 having the internal conductor 3 is formed by winding a rectangular magnetic sheet 14 having conductors 13 provided on two opposing sides. Therefore, it is possible to easily manufacture without using an advanced lamination technique or trimming technique.

In the chip inductor thus manufactured, the inductance value can be changed depending on the angle of the conductor 13 formed on the magnetic sheet 14. That is, when the conductor 13 is formed on the main surface of the magnetic sheet 14 at a steep angle close to its diagonal line, the inner conductor 3 in the magnetic element body 1 becomes a spiral shape having a long number of turns and a high inductance value. can get. On the other hand, when the conductor 13 is formed at a gentle angle with respect to the two opposite sides of the main surface of the magnetic sheet 14, the inner conductor 3 in the magnetic element body 1 has a spiral shape with a short number of turns and a low inductance value. Is obtained.

Further, the thickness of the magnetic sheet 14 is reduced and the length thereof is increased, so that the conductor 1 is formed on the opposite long side.
By forming 3 at a steep angle and increasing the number of turns of the magnetic material sheet 14, a higher inductance value can be obtained. On the other hand, if the thickness of the magnetic sheet 14 is increased and the length thereof is reduced so that the conductor 13 is formed at a gentle angle with respect to the opposing short side, a lower inductance value can be obtained.

[0010]

Embodiments of the present invention will now be described in detail with reference to the drawings. First, an example of a method for manufacturing a chip inductor according to the present invention will be described. Here, as shown in FIG. 2, first, a rectangular magnetic sheet 14 is prepared. The magnetic sheet 14 is a magnetic ceramic green sheet cut into a predetermined size. Magnetic ceramic green sheets are generally
Magnetic powder such as ferrite powder is dispersed in a resin binder to make a magnetic ceramics slurry, and this magnetic ceramics slurry is applied to a supporting film made of polyethylene terephthalate film or the like with a uniform thickness by means such as a doctor blade method. It can be formed by spreading it on and drying it.

Next, the two magnetic sheets 14 facing each other are provided.
A linear conductor 13 is formed along the side. In the magnetic sheet 14 shown in FIG. 2, the conductors 13 are diagonally formed on one surface of the magnetic sheet 14 in a substantially diagonal shape. In a usual manufacturing method, a large-sized magnetic ceramic green sheet is prepared, a plurality of conductors 13 are printed on the magnetic ceramic green sheet, and the magnetic ceramic green sheet is dried. The method of cutting is taken. Before and after this printing process, the support film is separated from the magnetic ceramic green sheet.

Next, the magnetic sheet 14 is wound from one side of the two sides orthogonal to the facing two sides to the other side like the magnetic sheet 14 on the lower side of FIG. As a result, an unfired cylindrical magnetic element body 11 as shown in FIG. 3 is completed. The magnetic element 11 is fired to remove the binder component in the magnetic sheet 14 and to sinter a magnetic material such as ferrite, and to become an internal conductor 13
Bake. After that, if necessary, a process such as polishing the end of the cylindrical magnetic element 11 is performed, and then FIG.
As shown by, the conductive paste 12 is applied to the end portions and baked to form the external electrodes 2. The firing of the cylindrical magnetic element 11 may be performed after the step of applying the conductive paste 12.

FIG. 1 shows the chip inductor thus manufactured. This chip-type inductor has a structure in which a fired magnetic body 1 is laminated in a radial direction from the inner circumference to the outer circumference, and the internal conductor 3 is provided between the magnetic layers 4.
Is provided. Since the inner conductor 3 is formed by the linear conductor 13 obliquely formed on the main surface of the magnetic sheet 14 forming the magnetic layer 4, the inner conductor 3 extends from one end of the magnetic element body 1 to the other end thereof. The spiral shape is formed from the inner peripheral side toward the outer peripheral side. Both ends of this internal conductor are connected to the external electrodes 2 and 2 formed at both ends of the magnetic body 1.

In the chip inductor according to the present invention having such a structure, an inductance can be obtained between the external electrodes 2 and 2 formed at both ends of the magnetic body 1.
In addition, its form is a so-called columnar chip type having external electrodes 2 and 2 at both ends of a columnar magnetic element 1, and a circuit component having another similar form, for example, a chip capacitor or a chip resistor. It can be mounted on a circuit board together with a container and the like.

In this chip-type inductor, the inductance value can be changed depending on the angle of the conductor 13 formed on the magnetic sheet 14. For example, as shown in FIG. 2, when the conductor 13 is formed on the main surface of the magnetic sheet 14 at a steep angle close to the diagonal line thereof, the inner conductor 3 in the magnetic body 1 is long and has a large number of turns. And the high inductance value is obtained. Further, by making the thickness of the magnetic sheet 14 thin and lengthening the length thereof to form the conductor 13 at a steep angle with respect to the opposing long side thereof, and increasing the number of windings of the magnetic sheet 14, Higher inductance values are obtained.

On the other hand, for example, as shown in FIG. 4 (a), the conductors 13 are provided on the main surface of the magnetic sheet 14 so as to face each other.
When formed at a gentle angle with respect to the side, the internal conductor 3 in the magnetic element body 1 has a short spiral shape with a small number of turns,
A low inductance value is obtained. Further, if the thickness of the magnetic sheet 14 is increased and the length thereof is reduced so that the conductor 13 is formed at a gentle angle with respect to the opposing short side, a lower inductance value can be obtained.

Further, as shown in FIG. 4B, the conductor 1
When 3 is formed substantially orthogonal to the two opposite sides of the main surface of the magnetic sheet 14, the internal conductor 3 in the magnetic element body 1 becomes
It is short and linear, resulting in lower inductance values. This is suitable for inductors for high frequency circuits. Two or more conductors 13 can be provided in parallel to the magnetic sheet 14, and in that case, inductors connected in parallel can be obtained. The same inductor can be obtained by providing the conductors 13 on both main surfaces of the magnetic sheet 14 so as not to come into contact with each other when the magnetic sheet 14 is wound.

[0018]

As described above, according to the present invention, it is possible to provide a chip-type inductor which can be manufactured by a simple method and can easily design various inductance values, and a manufacturing method thereof.

[Brief description of drawings]

FIG. 1 is a half cross-sectional perspective view showing a chip inductor according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a process of manufacturing the chip inductor according to the embodiment.

FIG. 3 is a schematic side view showing a process of manufacturing the chip inductor according to the embodiment.

FIG. 4 is a perspective view showing a process of manufacturing a chip inductor of another example.

[Explanation of symbols]

 1 Magnetic Element 2 External Electrode 3 Inner Conductor 4 Magnetic Layer 13 Conductor 14 Magnetic Sheet

Claims (2)

[Reference number] 0040658-01 [Claims] 1. A chip-shaped inductor having an inner conductor inside a cylindrical magnetic element, and external electrodes provided on both ends of the magnetic element so as to be connected to both ends of the inner conductor respectively. Magnetic layer (4) laminated on the outer peripheral side
A cylindrical magnetic element (1) made of and an internal conductor (3) formed between both ends of the magnetic element (1) between the magnetic layers (4) constituting the magnetic element (1). ,
A chip-type inductor comprising an external electrode (2) provided at both ends of a magnetic element (1) so as to be connected to both ends of the internal conductor (3). 2. A method for manufacturing a chip-type inductor comprising an inner conductor inside a cylindrical magnetic body, and external electrodes provided on both ends of the magnetic body so as to be connected to both ends of the inner conductor, respectively. , A step of forming a rectangular magnetic sheet (14), and a linear conductor (13) which becomes an internal conductor (3) over two opposing sides on at least one main surface of the magnetic sheet (14). The process of forming and this conductor (1
A step of forming a cylindrical magnetic element (1) by winding the magnetic sheet (14) having the above 3) from one side of the side intersecting the two opposite sides to the other side; And a step of providing external electrodes (2) and (2) on both ends of the element body (1).