JP2558986Y2 - Laminated coil - Google Patents

Description

[Detailed description of the invention]

[0001]

The present invention relates to, for example, a method of laminating a plurality of coil layers each having a coil forming pattern formed on an insulating ceramic body made of an electrically insulating metal oxide magnetic material or an insulating ceramic material. The present invention relates to a laminated coil formed.

[0002]

2. Description of the Related Art Conventionally, most coil components have a structure in which a copper wire is wound around a magnetic material such as ferrite. A multilayer chip component using the above technology has been used.

[0003] Japanese Patent Publication No. 62-22244 discloses such a laminated coil.

FIGS. 4 and 5 show a laminated coil disclosed in this publication. Reference numeral 11 denotes a magnetic layer, and reference numeral 13 denotes a single coil which is printed alternately with the magnetic layer 11. 2 shows a conductor formed so as to be as follows. Both ends T ₁ and T ₂ of the conductor 13 are drawn out to the outer peripheral side surface of the laminate, and the entire periphery of the conductor 13 is filled with a magnetic material as shown in FIG.

[0005] In such a laminated coil, since the periphery of the conductor 13 is filled with all magnetic flux of flow, as shown in FIG. 6, all phi _1, the ideal distribution like phi ₂ is not a to form a small loop around the conductor 13 phi _a, resulting in leakage, such as phi _B. Therefore, there is a problem that the inductance value of the laminated coil does not increase as expected. To prevent such problems,
It is necessary to increase the number of coil turns in the laminated coil, but there is a problem that increasing the number of coil turns increases the number of steps.

Therefore, as shown in FIG. 7, a magnetic layer 15 having a low magnetic permeability is formed between the conductors 13 at locations where the magnetic flux may form small loops. Laminated coils without small loops have been proposed.

FIGS. 8 to 10 show a manufacturing process of the laminated coil. First, as shown in FIG. 8, a conductor 21 is printed on a printed first layer 17 having magnetism.
Next, as shown in FIGS. 9 and 10, a paste 23 of a magnetic material having a high magnetic permeability is printed except for the portion of the conductor 21. Further, as shown in FIG. It is formed by printing a paste 25 of a magnetic material, printing a conductor to be connected to the conductor 21, and repeating the same lamination sequentially.

[0008]

However, in such a laminated coil, it is possible to prevent a small loop of the magnetic flux around the conductor 21, but the paste 25 of the magnetic material having a low magnetic permeability is being sintered. In addition, a reaction occurs with the high-permeability magnetic paste 23, which becomes a magnetic core, causing a change in the composition. As a result, the magnetic core has a low magnetic permeability, and the expected inductance cannot be obtained. Further, in the above-described laminated coil, it is difficult to form the magnetic layer 15 having a low magnetic permeability between the conductors 21, and the manufacturing process is complicated, which is not practical.

The laminated coil according to the present invention has been made to solve the above-mentioned problems, and it is possible to prevent a small loop of a magnetic flux around a conductor and to surely obtain a high inductance. It is an object of the present invention to provide a laminated coil that can be easily manufactured.

[0010]

[Means for Solving the Problems] As a result of diligent studies and researches on the above problems, the present inventors have found that a simple structure of simply forming a thin layer serving as a magnetic resistance between conductors has no adverse effect on a magnetic material. It has been found that it is possible to prevent a small loop of the magnetic flux without exerting the influence.

That is, the laminated coil of the present invention is formed by alternately laminating a plurality of insulating ceramic bodies having a pattern for forming a coil and insulating ceramic bodies having a pattern for blocking magnetic flux leakage. A laminated coil in which patterns are connected to each other via through holes provided in the insulating ceramic body to form one coil, and a main magnetic flux passes through the coil in a laminating direction. , The leakage flux blocking pattern,
It is formed at least between the coil forming patterns outside the main magnetic flux passage area.

[0012]

In the laminated coil of the present invention, the leakage magnetic flux tries to form a small loop around the coil forming pattern, but outside the main magnetic flux passage area and between the coil forming patterns, the leakage magnetic flux blocking pattern is formed. , The leakage magnetic flux is blocked by the leakage magnetic flux blocking pattern, and a small loop of the leakage magnetic flux around the coil forming pattern is prevented without laminating a magnetic material having a low magnetic permeability. Further, the laminated coil of the present invention is obtained by alternately laminating an insulating ceramic body having a coil forming pattern and an insulating ceramic body having a leakage magnetic flux blocking pattern.

[0013]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a laminated coil according to an embodiment of the present invention; FIGS. 1 and 2 show a laminated coil according to the present invention.
Indicates a multi-layered coil layer. These coil layers 31 are formed, for example, on an insulating ceramic body 33 formed of an electrically insulating metal oxide magnetic material (so-called ferrite) or an insulating ceramic material, for example, by using Ag,
A coil forming pattern 35 made of Pt and Pd is formed.

A magnetic flux leakage blocking layer 37 is formed between each coil layer 31. These leakage flux blocking layers 37 are provided on the insulating ceramic body 33 by, for example, A
The structure is formed by forming a leakage magnetic flux blocking pattern 39 made of g, Pt, and Pd. This leakage flux blocking pattern 39
Are formed in substantially the same shape as the coil forming pattern 35, that is, in a U-shape.

The ends of the coil forming patterns 35 are connected to each other through through holes 41 formed in the insulating ceramic body 33 to form one coil. Insulating ceramic body 33 of magnetic flux leakage blocking layer 37
, A leakage magnetic flux blocking pattern 39 is formed so as to open on the side where the through hole 41 is formed, and the leakage magnetic flux blocking pattern 39 is not electrically connected to the coil forming pattern 35. In such a laminated coil, as shown in FIG. 6, the main magnetic flux φ that generates inductance in the coil.
₁ and φ ₂ are generated in the laminating direction of the insulating ceramic body 33, and the leakage magnetic flux blocking pattern 39 is formed between the coil forming patterns 35 and the main magnetic fluxes φ ₁ and φ in the coil.
₂ will be formed outside the passage area. As shown in FIG. 3A, such a laminated coil has a first sheet 5
1, a paste 53 of a first coil forming pattern is printed, and after drying, a second sheet 57 having a through hole 55 formed on the first sheet 51 is pressed. Next, as shown in FIG. 3B, a U-shaped first magnetic flux shielding pattern paste 59 that does not pass through the through hole 55 is formed in the second sheet 57.
After drying, the third sheet 63 having the through holes 61 formed at the same position as the second sheet 57 is pressed. Thereafter, the paste 65 of the second coil forming pattern is printed on the third sheet 63. By repeating such a process, a laminated coil is formed.

In the laminated coil configured as described above, the leakage magnetic flux tries to form a small loop around the coil forming pattern 35.
Since the leakage magnetic flux blocking pattern 39 is formed between the coils, the leakage magnetic flux is blocked by the leakage magnetic flux blocking pattern 39, thereby preventing a small loop of the leakage magnetic flux around the coil forming pattern 35, thereby reliably increasing the inductance value. be able to.

Further, between the coil forming patterns 35,
Since the leakage magnetic flux blocking pattern 39 is interposed, the coil forming pattern 3 can be formed without laminating a magnetic material having a low magnetic permeability.
It is possible to prevent the leakage magnetic flux from becoming a small loop around 5. Therefore, the magnetic material having a low magnetic permeability and the magnetic material having a high magnetic permeability serving as a magnetic core do not react during firing, and there is no fluctuation in the composition of the magnetic core.

Further, the coil layer 31 and the coil layer 3
It can be manufactured only by alternately laminating the magnetic flux blocking layers 37 formed in the same manner as in 1, and a laminated coil can be easily manufactured.

In the above embodiment, the example in which the leakage magnetic flux blocking pattern 39 is formed in a U-shape has been described. However, the present invention is not limited to the above embodiment, and the shape of the leakage magnetic flux blocking pattern is not limited. That is, it is sufficient that the conductive pattern does not conduct with the coil forming pattern.

Further, in the above embodiment, a description has been given of a five-layer laminated coil. However, the present invention is not limited to the above-described embodiment, and the laminated coil of the present invention may have four layers or less, and may have six layers. That's fine.

[0021]

According to the laminated coil of the present invention, since the leakage magnetic flux blocking pattern is formed between the coil forming patterns and outside the area where the main magnetic flux in the coil passes, the magnetic material having a low magnetic permeability is used. Without laminating, it is possible to prevent the leakage magnetic flux from becoming a small loop around the coil forming pattern. Thus, the magnetic material having a low magnetic permeability and the magnetic material having a high magnetic permeability do not react during sintering, and the composition of the magnetic material does not change.

The laminated coil according to the present invention is, for example,
A paste for forming a pattern for forming a first coil is printed on a first sheet constituting an insulating ceramic body, and after drying, a second sheet having a through hole formed in the first sheet is pressure-bonded. The paste is formed by printing a paste forming a U-shaped leakage magnetic flux blocking pattern that does not pass through the through-hole and repeating such a process, so that the coil layer and the leakage magnetic flux formed in the same manner as this coil layer It can be manufactured simply by alternately stacking the barrier layers and the shielding layer, and the stacked coil can be easily manufactured.

[Brief description of the drawings]

FIG. 1 is a front view showing a part of a laminated coil according to the present invention.

FIG. 2 is an exploded perspective view of FIG.

FIG. 3 is an explanatory view illustrating a method of manufacturing the laminated coil according to the present invention;

FIG. 4 is a plan view of a conventional laminated coil.

FIG. 5 is a longitudinal sectional view taken along line AA of FIG. 4;

FIG. 6 is a transverse sectional view taken along line BB of FIG. 4;

FIG. 7 is a cross-sectional view showing a conventional laminated coil in which an insulating ceramic body between coil forming patterns has a low magnetic permeability.

8 is a plan view showing the manufacturing method of FIG. 7, showing a state where a pattern portion is formed in a first layer.

FIG. 9 is a plan view showing the manufacturing method of FIG. 7, showing a state in which a paste of a magnetic material is printed except for a pattern.

FIG. 10 is a transverse sectional view taken along the line CC of FIG. 9;

11 is a cross-sectional view showing a state in which a paste of a low magnetic permeability material is printed on a pattern portion in FIG. 9;

[Explanation of symbols]

 31 Coil Layer 33 Insulating Ceramic Body 35 Coil Forming Pattern 37 Leakage Flux Blocking Layer 39 Leakage Flux Blocking Pattern 41 Through Hole

Claims (1)

(57) [Scope of request for utility model registration] An insulating ceramic body having a coil forming pattern and an insulating ceramic body having a leakage magnetic flux blocking pattern are alternately laminated in a plurality, and the coil forming patterns are connected to each other by the insulating ceramic body. A single coil is formed by being connected to each other through through holes provided in the body, and the main magnetic flux is a laminated coil that passes through the coil in the laminating direction, and the leakage magnetic flux blocking pattern is A multilayer coil formed at least between the coil forming patterns outside a region where the main magnetic flux passes.