JP2005150168A - Laminated coil component - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a laminated coil component in which a low permeability material (a non-magnetic substance material) can be arranged around a conductor pattern for the coil without depending upon printing and which has excellent electrical characteristics. <P>SOLUTION: A laminated common-mode choke coil 1 is composed of a ceramic green sheet 11 to which the conductor patterns 2 for the coil and holes 6 filled with a high-permeability material are formed and which has a low permeability, and the highly permeable ceramic green sheet 12 to which the conductor patterns 3 for the coil and via holes 8 for an interlayer connection are formed. The choke coil is further composed of the ceramic green sheets 13 and 14, to which leading-out conductor patterns 4 and 5 are formed respectively and which have the high permeability, and the ceramic green sheets 15 having the high permeability for external layers. The ceramic layer 11 having the low permeability is arranged between spiral coils L1 and L2. Holes 6 filled with the high-permeability material are formed to the ceramic layer 11 so as to surround the coils L1 and L2 in a plan view. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a multilayer coil component, and more particularly to a multilayer coil component such as a multilayer inductor, a multilayer impedance element, or a multilayer transformer.

  A multilayer ceramic electronic component that magnetically couples two coils, such as a multilayer transformer and a multilayer common mode choke coil, is known. FIG. 11 is a schematic cross-sectional view of a conventional laminated common mode choke coil 100. In this laminated common mode choke coil 100, a plurality of coil conductor patterns 101 and 102 are respectively provided in via holes (not shown) in a high permeability ceramic laminate 110 formed by laminating a plurality of high permeability ceramic sheets. Coils L1 and L2 that are electrically connected in series are arranged. Conventionally, the low magnetic permeability ceramic material 105 is disposed around the coil conductor patterns 101 and 102 to suppress the generation of local leakage magnetic flux φB that swirls around the coil conductor patterns 101 and 102. Increasing the coupling coefficient between the coils L1 and L2 by increasing the magnetic flux φA turning around the entire L1 and L2. In FIG. 11, reference numerals 111 and 112 denote input / output external electrodes.

  Also, in Patent Document 1, a nonmagnetic material is disposed only around the coil conductor pattern and the other portions are made of magnetic material, so that a magnetic material pattern and a nonmagnetic material pattern are formed on the same surface by printing. A laminated transformer is described.

  However, it is technically difficult to print different materials on the same surface because printing blur is likely to occur, and there is a problem that the manufacturing process is complicated and the yield is likely to decrease.

Furthermore, in the case of the laminated transformer of Patent Document 1, in order to cover the entire spiral coil conductor pattern with a nonmagnetic material (low magnetic permeability material), the magnetic flux passing through the gap between the coil conductor patterns on the same layer is applied. There was also a problem of blocking and preventing the upper and lower layers from being bonded at that portion.
JP-A-9-306770

  Therefore, an object of the present invention is to provide a laminated coil component having a low magnetic permeability material (non-magnetic material) around a coil conductor pattern and having excellent electrical characteristics without depending on printing. There is to do.

In order to achieve the above object, a laminated coil component according to the present invention includes:
(A) a laminate formed by stacking a plurality of ceramic layers and a plurality of coil conductor patterns;
(B) comprising at least two coils composed of a plurality of coil conductor patterns;
(C) In the stacking direction of the ceramic layers, the ceramic layer disposed between the two coils is a low permeability ceramic layer made of a low permeability material. The low-permeability ceramic layer is provided with a hole filled with a high-permeability material so as to surround the coil in plan view. The hole filled with the high magnetic permeability material becomes a magnetic path of the magnetic field generated by the coil.

  With the above configuration, the occurrence of local leakage magnetic flux swirling in the vicinity of the coil conductor pattern is suppressed, the magnetic flux swirling the entire two coils arranged in the stacking direction of the ceramic layers is strengthened, and the two coils are coupled. The coefficient is improved.

The laminated coil component according to the present invention is
(D) a laminate formed by stacking a plurality of ceramic layers and a plurality of coil conductor patterns;
(E) a spiral coil constituted by a plurality of coil conductor patterns;
(F) In the stacking direction of the laminated body, the ceramic layer disposed between the coil conductor patterns is a low permeability ceramic layer made of a low permeability material. The low-permeability ceramic layer is provided with a hole filled with a high-permeability material so as to surround the spiral coil in plan view. The hole filled with the high magnetic permeability material becomes a magnetic path of the magnetic field generated by the spiral coil.

  With the above configuration, the occurrence of local leakage magnetic flux swirling in the vicinity of the coil conductor pattern is suppressed, and the inductance value of the spiral coil is improved.

  According to the present invention, a low permeability ceramic layer is disposed between two coils or between two coil conductor patterns, and the low permeability ceramic layer has a high permeability so as to surround the coil in plan view. By providing the hole filled with the material, the low permeability ceramics can be disposed around the coil conductor pattern without printing a plurality of types of materials on the same surface. As a result, it is possible to easily manufacture a laminated coil component with little leakage magnetic flux with a high yield.

  Below, the Example of the laminated coil component which concerns on this invention is described with reference to an accompanying drawing with the manufacturing method.

[First embodiment, FIGS. 1 to 5]
As shown in FIG. 1, the laminated common mode choke coil 1 includes a low-permeability ceramic green sheet 11 provided with a coil conductor pattern 2 and a hole 6 filled with a high-permeability material, and a coil conductor pattern 3. High permeability ceramic green sheet 12 provided with via holes 8 for interlayer connection, high permeability ceramic green sheets 13 and 14 provided with lead conductor patterns 4 and 5, respectively, and high permeability ceramic green sheet 15 for outer layers It is configured.

  The low-permeability ceramic green sheet 11 is obtained by kneading a low-permeability ceramic powder, non-magnetic ceramic powder, or glass powder together with a binder or the like into a sheet shape by a method such as a doctor blade method.

  The high magnetic permeability ceramic green sheets 12 to 15 are, for example, those obtained by kneading Fe—Ni—Cu ferrite powder together with a binder or the like into a sheet shape by a method such as a doctor blade method.

  The coil conductor patterns 2 and 3 and the lead conductor patterns 4 and 5 are respectively formed on the sheets 11 to 14 by a method such as a screen printing method or a photolithography method. These conductor patterns 2 to 5 are made of Ag, Pd, Cu, Au, alloys thereof, or the like.

  The coil conductor patterns 2 and 3 have a spiral shape, and form a first coil L1 and a second coil L2, respectively. The coil axes of the coils L1, L2 are parallel to the stacking direction of the sheets 11-15. In plan view, one end 2 a of the coil conductor pattern 2 is exposed on the right side of the front side of the sheet 11, and the other end 2 b is located in the center of the sheet 11. One end 4 a of the lead conductor pattern 4 is exposed on the right side of the back side of the sheet 13, and the other end 4 b is located at the center of the sheet 13, and the interlayer connection via hole 8 provided at the center of the sheet 13. And electrically connected to the end 2b of the coil conductor pattern 2.

  On the other hand, one end portion 3 a of the coil conductor pattern 3 is exposed on the left side of the front side of the sheet 12, and the other end portion 3 b is located at the center of the sheet 12. One end portion 5 a of the lead conductor pattern 5 is exposed on the left side of the back side of the sheet 14, and the other end portion 5 b is located in the center portion of the sheet 14, and the interlayer connection via hole 8 provided in the center portion of the sheet 12. And electrically connected to the end 3b of the coil conductor pattern 3.

  The via hole 8 for interlayer connection is formed with a through hole using a laser beam or the like in the sheets 12 and 13 before the conductor patterns 3 and 4 are formed, and Ag, Pd, Cu, Au, and alloys thereof are formed in the through hole. The conductive paste is filled by a method such as printing and coating.

  The hole 6 filled with the high magnetic permeability material is formed in the low magnetic permeability ceramic green sheet 11 before forming the conductor patterns 3 and 4 using a laser beam or the like, and the insulating property of the high magnetic permeability material is formed in the hole 6. The paste is filled by a method such as printing. The holes 6 are formed in the outer peripheral portion and the central portion of the spiral coil conductor pattern 2. The diameter of the hole 6 is substantially equal to the via hole 8 for interlayer connection, and preferably has a size of 200 μm or less. This is because when the diameter of the hole 6 exceeds 200 μm, the printed high-permeability material insulating paste easily falls out of the hole 6 and printability is deteriorated. As the high-permeability material insulating paste, for example, an Fe—Ni—Cu ferrite powder kneaded together with a binder or the like is used. The magnetic permeability of this high magnetic permeability material is preferably equal to or higher than that of the high magnetic permeability ceramic green sheets 12-15.

  The sheets 11 to 15 having the above configuration are stacked and pressure-bonded as shown in FIG. 1 and then integrally fired to form a laminated body 20 having a rectangular parallelepiped shape as shown in FIG. Next, the input / output external electrodes 21a and 22a are formed on the front side surface of the laminate 20, and the input / output external electrodes 21b and 22b are formed on the back side surface. The external electrodes 21a to 22b are formed by a method such as coating baking, sputtering, or vapor deposition. Between the external electrodes 21a and 21b, the coil conductor pattern 2 and the lead conductor pattern 4, that is, the first coil L1 are connected. Between the external electrodes 22a and 22b, the coil conductor pattern 3 and the lead conductor pattern 5, that is, the second coil L2 are connected.

  In the laminated common mode choke coil 1 thus obtained, spiral coils L1 and L2 whose coil axes are parallel to the stacking direction of the sheets 11 to 15 are vertically stacked inside the stacked body 20, as shown in FIG. It is arranged in the state. In the stacking direction of the sheets 11 to 15, a low permeability ceramic layer 11 made of a low permeability material is disposed between the spiral coils L <b> 1 and L <b> 2.

  The low magnetic permeability ceramic layer 11 is provided with holes 6 filled with a high magnetic permeability material so as to surround the spiral coils L1 and L2 in plan view. The holes 6 filled with the high permeability material serve as magnetic paths for the magnetic fields generated by the coils L1 and L2, respectively. Therefore, the occurrence of local leakage flux φB swirling in the vicinity of each of the coil conductor patterns 2 and 3 is suppressed, and the magnetic flux φA swirling the entire coils L1 and L2 is strengthened, and the coupling coefficient between the coils L1 and L2 is increased. Can be raised. When the hole 6 filled with the high magnetic permeability material is arranged as close to the coil conductor patterns 2 and 3 as possible, the magnetic flux φA is swirled more efficiently, so that the coupling coefficient is further improved.

  In addition, according to the above manufacturing method, it is only necessary to print and apply the insulating paste of the high magnetic permeability material to the hole 6 formed in the sheet 11, and without having to print a plurality of types of materials on the same surface, the coil conductor Low permeability ceramics can be disposed around the patterns 2 and 3. As a result, it is possible to prevent a decrease in yield of the laminated common mode choke coil 1 due to a printing defect.

  Furthermore, since the hole 6 filled with the high magnetic permeability material may be formed in the sheet 11 before the lamination pressure bonding in advance, it is compared with the method of manufacturing the common mode choke coil having the laminated structure by sequentially applying the coating. And can be easily manufactured.

  The holes 6 filled with the high magnetic permeability material may be formed in a narrow region between the coil conductor patterns 2 as shown in FIG. This further increases the coupling coefficient between the coils L1 and L2. Further, as shown in FIG. 5, the holes 6 filled with the high magnetic permeability material may not be formed in a narrow region between the coil conductor patterns 2. Thereby, a yield improves.

[Second Embodiment, FIGS. 6 to 8]
As shown in FIG. 6, the laminated common mode choke coil 31 includes a low permeability ceramic green sheet 41 provided with coil conductor patterns 32 and 33, a hole 36 filled with a high permeability material, and an interlayer connection via hole 38. And the high permeability ceramic green sheet 42 provided with the coil conductor pattern 33, and the outer layer high permeability ceramic green sheet 42 provided with no conductor pattern in advance.

  The coil conductor patterns 32 are electrically connected in series through interlayer connection via holes 38 provided in the sheet 41 to form a first spiral coil L1. One end 32a of the spiral coil L1 is exposed on the right side of the front side of the sheet 41, and the other end is exposed on the right side of the back side of the sheet 41. On the other hand, each coil conductor pattern 33 is electrically connected in series through an interlayer connection via hole 38 provided in the sheet 41 to form a second spiral coil L2. One end 33a of the spiral coil L2 is exposed on the left side of the front side of the sheet 41, and the other end 33b is exposed on the left side of the back side of the sheet 42.

  The holes 36 filled with the high magnetic permeability material are formed in the outer peripheral portion and the central portion of the coil conductor patterns 32 and 33 of the low magnetic permeability ceramic green sheet 41. The holes 36 filled with the high magnetic permeability material are connected in the stacking direction of the sheets 41 and 42 to form columnar holes.

  The sheets 41 and 42 having the above configuration are stacked and pressure-bonded as shown in FIG. 6 and then integrally fired to form a laminated body 50 having a rectangular parallelepiped shape as shown in FIG. Next, the input / output external electrodes 51a and 52a are formed on the front side surface of the multilayer body 50, and the input / output external electrodes 51b and 52b are formed on the back side surface. A first coil L1 is connected between the external electrodes 51a and 51b. A second coil L2 is connected between the external electrodes 52a and 52b.

  In the laminated common mode choke coil 31 thus obtained, spiral coils L1 and L2 whose coil axes are parallel to the stacking direction of the sheets 41 and 42 are vertically stacked inside the stacked body 50 as shown in FIG. It is arranged in the state. In the stacking direction of the sheets 41, 42, a low permeability made of a low permeability material is provided between the coil conductor patterns 32 and 33, between the coil conductor patterns 32, and between the coil conductor patterns 33. A ceramic layer 41 is disposed.

  The low permeability ceramic layer 41 is formed with columnar holes 36 formed by holes 36 filled with a high permeability material, and these columnar holes 36 surround the spiral coils L1 and L2 in plan view, respectively. It is out. The columnar holes 36 filled with the high permeability material serve as magnetic paths for the magnetic fields generated by the spiral coils L1 and L2, respectively. Therefore, the laminated common mode choke coil 31 according to the second embodiment has the same effects as the laminated common mode choke coil 1 according to the first embodiment.

[Third embodiment, FIGS. 9 and 10]
As shown in FIG. 9, the laminated inductor 61 includes a low magnetic permeability ceramic green sheet 71 provided with a coil conductor pattern 62, a hole 66 filled with a high magnetic permeability material, and an interlayer connection via hole 68, and a coil conductor. The high-permeability ceramic green sheet 72 provided with the pattern 62 and the high-permeability ceramic green sheet 72 for the outer layer not provided with a conductor pattern in advance.

  Each of the coil conductor patterns 62 is electrically connected in series through an interlayer connection via hole 68 provided in the sheet 71 to form a spiral coil L. One end portion 62 a of the spiral coil L is exposed on the near side of the sheet 72, and the other end portion is exposed on the far side of the sheet 71.

  The holes 66 filled with the high magnetic permeability material are formed in the outer peripheral portion and the central portion of the coil conductor pattern 62 of the low magnetic permeability ceramic green sheet 71. The holes 66 filled with the high magnetic permeability material are connected in the stacking direction of the sheets 71 and 72 to form columnar holes.

  The sheets 71 and 72 having the above configuration are stacked and pressure-bonded as shown in FIG. 9, and then fired integrally to form a laminated body 80 having a rectangular parallelepiped shape as shown in FIG. Next, the input / output external electrode 81a is formed on one side surface of the laminate 80, and the input / output external electrode 81b is formed on the other side surface. A coil L is connected between the external electrodes 81a and 81b.

  In the laminated inductor 61 obtained in this way, a low permeability ceramic layer 71 made of a low permeability material is disposed between the coil conductor patterns 62 in the stacking direction of the sheets 71 and 72.

  The low magnetic permeability ceramic layer 71 has columnar holes 66 formed by holes 66 filled with a high magnetic permeability material, and these columnar holes 66 surround the spiral coil L in plan view. The columnar hole 66 filled with the high magnetic permeability material becomes a magnetic path of the magnetic field generated by the spiral coil L. Therefore, the generation of the local leakage magnetic flux φB swirling in the vicinity of the coil conductor pattern 62 is suppressed, and the magnetic flux φA swirling the entire spiral coil L becomes strong, so that the multilayer inductor 61 having a large inductance value can be obtained. it can.

[Other embodiments]
In addition, this invention is not limited to the said Example, It can change variously within the range of the summary. The laminated coil component includes, for example, a laminated transformer, a laminated impedance element, and a laminated LC composite component in addition to the laminated common mode choke coil and the laminated inductor. Moreover, although the said Example demonstrated by the example of the individual product, in the case of mass production, it manufactures in the state of the mother laminated block containing several laminated coil components.

1 is an exploded perspective view showing a first embodiment of a laminated coil component according to the present invention. FIG. 2 is an external perspective view of the multilayer coil component shown in FIG. 1. FIG. 3 is a schematic cross-sectional view of the multilayer coil component shown in FIG. 2. The top view which shows the modification of a low magnetic permeability ceramic sheet. The top view which shows another modification of a low-permeability ceramic sheet. The disassembled perspective view which shows 2nd Example of the laminated coil component which concerns on this invention. FIG. 7 is an external perspective view of the multilayer coil component shown in FIG. 6. FIG. 8 is a schematic cross-sectional view of the multilayer coil component shown in FIG. 7. The disassembled perspective view which shows 3rd Example of the laminated coil component which concerns on this invention. FIG. 10 is a schematic cross-sectional view of the multilayer coil component shown in FIG. 9. The schematic cross section which shows a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,31 ... Laminated common mode choke coil 2, 3, 32, 33 ... Coil conductor pattern 6, 36 ... Hole filled with high permeability material 11, 41 ... Low permeability ceramic green sheet 12-15, 42 ... High permeability ceramic green sheet 20, 50 ... laminated body 61 ... laminated inductor 62 ... coil conductor pattern 66 ... hole filled with high permeability material 71 ... low permeability ceramic green sheet 72 ... high permeability ceramic green sheet 80 ... Laminated body L1, L2 ... Coil L ... Spiral coil

Claims (4)

A laminate formed by stacking a plurality of ceramic layers and a plurality of conductor patterns for coils;
Comprising at least two coils composed of the plurality of coil conductor patterns,
In the stacking direction of the ceramic layers, the ceramic layer disposed between the two coils is a low permeability ceramic layer made of a low permeability material,
The low magnetic permeability ceramic layer is provided with a hole filled with a high magnetic permeability material so as to surround the coil in a plan view.
A laminated coil component characterized by A laminate formed by stacking a plurality of ceramic layers and a plurality of conductor patterns for coils;
A spiral coil configured with the plurality of coil conductor patterns,
In the stacking direction of the laminate, the ceramic layer disposed between the coil conductor patterns is a low permeability ceramic layer made of a low permeability material,
The low magnetic permeability ceramic layer is provided with a hole filled with a high magnetic permeability material so as to surround the spiral coil in a plan view.
A laminated coil component characterized by A laminate formed by stacking a plurality of ceramic layers and a plurality of conductor patterns for coils;
Comprising at least two coils composed of the plurality of coil conductor patterns,
In the stacking direction of the ceramic layers, the ceramic layer disposed between the two coils is a low permeability ceramic layer made of a low permeability material,
The low permeability ceramic layer is provided with a hole filled with a high permeability material, the hole being a magnetic path of a magnetic field generated by the coil;
A laminated coil component characterized by A laminate formed by stacking a plurality of ceramic layers and a plurality of conductor patterns for coils;
A spiral coil configured with the plurality of coil conductor patterns,
In the stacking direction of the laminate, the ceramic layer disposed between the coil conductor patterns is a low permeability ceramic layer made of a low permeability material,
The low permeability ceramic layer is provided with a hole filled with a high permeability material, the hole being a magnetic path of a magnetic field generated by the helical coil;
A laminated coil component characterized by

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