JP2002252117A - Laminated coil component and its manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a laminated coil component that can be reduced in size and in manufacturing cost and has a low conductor resistance, and to provide a method of manufacturing the component. SOLUTION: A coil 2, the center axis of which crosses the direction of a lamination A of an element (laminate) 1 at right angles, is formed by respectively connecting one- and the other-side end sections of a prescribed via hole of a plurality of via holes 4 provided in the element 1, in the direction of lamination A to one- and the other-side end sections of another prescribed via hole of the via holes 4 in the direction of lamination A through belt-like connecting electrodes 5 having plural-layer structures and provided in the element 1, in parallel with the laminating surface of the element 1 (in the direction perpendicular to the direction of lamination A). At the same time, the coil 2 is connected to an external electrode 3 for inputting and outputting through a lead-out electrode 6, which has a plural-layer structure and are provided in parallel with the lamination surface.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laminated coil component and a method for manufacturing the same, and more particularly, to a laminated inductor such as a laminated inductor or a laminated LC composite component in which a coil having a laminated structure is disposed in a laminated body. The present invention relates to a laminated coil component and a method for manufacturing the same.

[0002]

2. Description of the Related Art One of the typical multilayer coil components is a multilayer inductor. Among such multilayer inductors, for example,
Some have a structure as shown in FIG. That is,
In this laminated inductor, a laminated coil 52 orbiting around a coil central axis set so as to coincide with a laminating direction A of a laminated element 51 is disposed inside the element 51, and The device 51 has a structure in which input / output external electrodes 53 are provided on both end surfaces of the element 51 from which both end portions are drawn out.

[0003] The conventional multilayer inductor described above is
Normally, as shown in FIG. 10, a ceramic green sheet 56 in which a via hole 54 for interlayer connection is formed,
After a conductive paste is printed in a shape corresponding to the via hole 54 by a method such as screen printing to form a coil pattern (internal electrode) 55, the coil pattern 5 is formed.
5 and a ceramic green sheet 59 having via holes 57 formed at predetermined positions and electrode films 58 for connection to the outside formed on the front and back surfaces, and laminated and pressed together. After firing,
It is manufactured through a process of forming the input / output external electrodes 53 (FIG. 9).

However, as described above, the thickness of the electrode (the coil pattern (internal electrode) 55 after firing) formed by screen-printing and firing a conductive paste is as small as about 20 μm at the maximum. In the above-described conventional laminated coil component having the coil 52 (FIG. 9) including the coil pattern 55, the conductor resistance is large, and it is difficult to sufficiently cope with a large current.

As a method of reducing the conductor resistance, for example, a method of increasing the electrode thickness by laminating the same coil pattern 55 in a plurality of layers is conceivable. However, an increase in the number of laminated layers causes an increase in the size of the product. Not only
There is a problem that the manufacturing process is complicated and the cost is increased. The above problem is not limited to the multilayer inductor, but also applies to various multilayer coil components such as a multilayer LC composite component.

The present invention solves the above-mentioned problems, and provides a laminated coil component which can be reduced in size, has low conductor resistance, and can reduce the production cost, and a method for producing the same. The purpose is to:

[0007]

To achieve the above object, a laminated coil component according to claim 1 of the present invention comprises:
Inside the laminated body, a structure is provided in which a coil orbiting around a coil central axis orthogonal to the laminating direction is provided, and on both end surfaces of the laminated body, input / output external electrodes that are electrically connected to both ends of the coil are provided. A laminated coil component having:
Via holes arranged at a plurality of positions viewed from the laminating direction such that the axis thereof is along the laminating direction, and one of the predetermined via holes disposed in parallel with the laminating surface inside the laminated body and in a laminating direction. By connecting the side end portions and the other end portions of the predetermined via holes in the stacking direction with each other, in cooperation with the via holes, a strip having a multilayer structure in which the coil central axis forms a coil orthogonal to the stacking direction. A connection electrode, and a multi-layered extraction electrode that is provided inside the laminate and is arranged in parallel with the lamination surface and connects the coil formed of a via hole and a strip-shaped connection electrode to the input / output external electrode. It is characterized by doing.

In the laminated coil component according to the present invention (claim 1), one end of one of the plurality of via holes in the laminating direction of the predetermined via hole and the other end of the predetermined via hole in the laminating direction are provided. The coils are connected to each other by a strip-shaped connection electrode having a multi-layer structure arranged in parallel with (in the direction perpendicular to the laminating direction) parallel to the laminating surface to form a coil having a coil center axis perpendicular to the laminating direction. The coil is connected to the input / output external electrode by a multi-layered lead electrode arranged in parallel with the above, so that the conductor resistance can be reduced without increasing the size of the product. .
That is, the thickness of the strip-shaped connection electrode and the extraction electrode is increased (the number of layers is increased) until the cross-section area equivalent to the electrode cross-section area of the via hole is secured in a multi-layer structure of the strip-shaped connection electrode and the extraction electrode. In addition, the conductor resistance can be reduced without impairing the miniaturization, and the responsiveness to a large current can be improved.

In the laminated coil component according to a second aspect of the present invention, the extraction electrode is provided at a substantially central portion of the laminated body in the laminating direction,
It is characterized by being arranged in parallel with the lamination surface.

When the extraction electrode is disposed near the outermost layer of the laminate, a floating capacitance may be generated between the electrode on the mounting board and the extraction electrode, and the high-frequency characteristics are easily deteriorated. Therefore, it is necessary to consider the directionality at the time of mounting. However, in the multilayer coil component according to claim 2, the extraction electrode is provided substantially at the center of the multilayer body in the stacking direction, and at the same time as the stacking surface. Since they are arranged in parallel, it is possible to suppress the generation of stray capacitance between the electrodes on the mounting board and the extraction electrodes, and eliminate the directionality during mounting, and Workability can be improved.

According to a third aspect of the present invention, in the laminated coil component, a capacitance acquiring external electrode facing the coil is formed on the surface of the laminated body, the external electrode being constituted by a via hole and a strip-shaped connection electrode. And

In the case where a capacitance acquisition external electrode facing a coil formed of a via hole and a strip-shaped connection electrode is provided on the surface of the laminate, the capacitance acquisition external electrode is provided on the surface of the laminate. Only by doing so, it is possible to secure a necessary capacitance between the via hole and the external electrode for obtaining capacitance, and it is possible to easily configure a laminated LC composite component.

According to a fourth aspect of the present invention, in the laminated coil component, the capacitance opposing the band-shaped connection electrode is provided in at least one region on one side and the other side outside the band-shaped connection electrode in the lamination direction inside the laminate. An internal electrode for acquisition is provided, an external electrode for ground connection is provided on the surface of the laminate, and the internal electrode for capacitance acquisition is connected to the external electrode for ground connection. And

In at least one region on one side and the other side outside the band-shaped connection electrode in the stacking direction, a capacitance acquisition internal electrode facing the band-shaped connection electrode is arranged, and a ground connection external electrode is provided on the surface of the laminate. By arranging the electrodes and connecting the capacitance acquisition internal electrode to the ground connection external electrode, it is possible to secure a larger capacitance than in the case of the multilayer coil component according to claim 3, and to improve the characteristic design. The degree of freedom can be improved.

According to a fifth aspect of the present invention, in the multilayer coil component, a region of the multilayer body where the capacitance acquiring internal electrode is disposed is formed of a material mainly composed of a dielectric ceramic. I have.

By forming the region of the laminated body where the internal electrodes for obtaining capacitance are arranged from a material containing dielectric ceramic as a main component, it is possible to secure a still larger capacitance. It can be effective.

Further, a method of manufacturing a laminated coil component according to the present invention (claim 6) is a method for producing a laminated coil component according to any one of claims 1 to 5, wherein the method comprises the steps of: After forming a through hole in the ceramic green sheet by irradiating the split laser beam, a step of filling the through hole with a conductive paste to form a via hole is provided.

After irradiating the laser beam split by the diffraction grating to form a through hole in the ceramic green sheet,
By filling this through hole with a conductive paste to form a via hole, a highly accurate through hole can be formed very efficiently in the ceramic green sheet. It becomes possible to manufacture efficiently. Further, according to the method of irradiating a laser beam, it is possible to form a fine and high-precision via hole, and thus it is possible to form a coil having the same product dimensions and a large number of turns.

In the method of manufacturing a laminated coil component according to a seventh aspect of the present invention, when forming the laminated body by laminating the ceramic green sheets in which the via holes are formed.
Each time one or two or more ceramic green sheets are laminated, they are laminated while being pre-pressed, and after laminating a predetermined number of sheets, a full-press is formed to form a laminate.

Each time one or two or more ceramic green sheets are laminated, they are laminated while temporarily pressing them, and after laminating a predetermined number of sheets, the final pressure bonding is performed without causing displacement of the coil pattern. A desired laminated body can be reliably formed, and the laminated coil component of the present invention can be manufactured more efficiently.

[0021]

Embodiments of the present invention will be described below with reference to the drawings. In the following embodiments, a multilayer inductor and a multilayer LC composite component having a structure in which a coil is disposed in a magnetic ceramic will be described as examples.

[First Embodiment] FIG. 1 is an external perspective view showing a multilayer inductor according to an embodiment (first embodiment) of the present invention, and FIG. 2 is an exploded perspective view showing a multilayer body constituting the multilayer inductor. is there.

As shown in FIG. 1, the laminated inductor according to the first embodiment circulates around a coil central axis set so as to be orthogonal to the laminating direction A of the element 1 inside the element (laminated body) 1. The coil 2 has a structure in which the input / output external electrodes 3 electrically connected to both ends of the coil 2 are provided on both end faces of the element 1.

In the element 1, a plurality of via holes 4 are disposed at predetermined plane positions (positions viewed in the laminating direction) such that their axes are aligned with the laminating direction A. I have. Similarly, inside the element 1, one end (upper end) of the predetermined via hole 4 in the laminating direction and the other end (lower end) of the predetermined via hole 4 in the laminating direction are connected. By doing so, the strip-shaped connection electrodes 5 having a multilayer structure, which are integrated with the via holes 4 and constitute the coil 2 having the coil center axis orthogonal to the stacking direction A, are parallel to the stacking surface (the direction orthogonal to the stacking direction A). It is arranged in.

Further, inside the element 1, there is provided a lead electrode 6 having a multi-layer structure for connecting the coil 2 composed of the via hole 4 and the strip-shaped connection electrode 5 to the input / output external electrode 3, parallel to the lamination surface. (A direction orthogonal to the stacking direction A). In the multilayer inductor of the first embodiment, the extraction electrode 6 is formed on the same plane as the strip-shaped connection electrode 5.

Next, a method of manufacturing the multilayer inductor of the first embodiment will be described. First, as shown in FIG. 2, (1) a ceramic green sheet 8 in which a via hole 7 (which eventually becomes a via hole 4 (FIG. 1)) is formed at each predetermined position; Via Hole 9
A band-shaped connection electrode 5 (FIG. 1) and a lead-out electrode 6 having predetermined shapes are formed (which eventually become connection portions with the via holes 4 (FIG. 1)) and include these via holes 9.
And (3) via holes 13 (which are finally connected to via holes 4 (FIG. 1)) at predetermined positions, and (3) ceramic green sheets 12 on which conductive patterns 10 and 11 are formed, and , These via holes 13
Green sheet 1 on which a conductor pattern 14 to be a strip-shaped connection electrode 5 having a predetermined shape (FIG. 1) is formed.
5 and (4) Four types of ceramic green sheets 16 for the outer layer where via holes and conductor patterns are not formed are prepared.

The ceramic green sheets 8, 1
Examples of 2, 15, 16 include a magnetic ceramic material such as Ni-Cu-Zn ferrite or Ni-Zn ferrite, or a non-magnetic insulating ceramic material made of glass ceramic, etc. And the like molded by the above method.

The conductor patterns 10, 11, 14 are
For example, it is formed by screen-printing a conductive paste containing Ag as a main component. As shown in FIG. 2, the conductor pattern 11 serving as the extraction electrode 6 is extended to near the edge of the ceramic green sheet 12, and along one edge of the ceramic green sheet 12 near the edge. Thus, it is formed in a belt-like pattern and is configured to reliably conduct with the external electrode 3.

The via holes 7, 9, 13 penetrate into predetermined positions of the ceramic green sheets 8, 12, 15 by irradiating a laser beam emitted from a laser light source and passing through a diffraction grating and dispersed. After the holes are formed, the through holes are filled with a conductive paste.

The through holes serving as the via holes 7, 9, and 13 are, for example, an XY table that movably supports a ceramic green sheet mother sheet, a laser light source such as CO ₂ or YAG, and a laser light source. A diffraction grating that passes the laser beam emitted from the diffraction grating into a plurality of laser beams having a shape corresponding to the through-hole, for example, a circular cross-sectional shape, and a predetermined reflection of the laser beam that has passed through the diffraction grating. Using a processing device including a galvano scan mirror that reflects light at an angle and a condenser lens that collects the reflected laser beam, sections corresponding to each of the elements 1 are preset on the mother sheet, and Efficient production is achieved by applying a method of simultaneously forming the required number of through holes in each section while moving the sheet. It is possible to.

When such laser beam irradiation is used, through holes having a diameter of about 50 μm to about 200 μm can be efficiently formed in the ceramic green sheets 8, 12, 15 with a positional accuracy of about ± 10 μm. Can be formed. Therefore, it is possible to form a coil having a large number of turns with the same product dimensions. Note that the method of forming the through holes is not limited to the method using the laser beam irradiation as described above, and a method such as punching using a die or drilling using a drill can also be applied.

Then, a predetermined number of ceramic green sheets 8 are laminated so that the via holes 7 formed at predetermined positions overlap each other, and at the same time, conductor patterns 10 and 11 serving as strip-shaped connection electrodes 5 and extraction electrodes 6 are formed. A predetermined number of the obtained ceramic green sheets 12 are laminated on the upper surface side of the ceramic green sheet 8 such that the via holes 9 overlap the via holes 7, and further,
A predetermined number of the ceramic green sheets 15 on which the conductor patterns 14 to be the strip-shaped connection electrodes 5 are formed are laminated on the lower surface side of the ceramic green sheet 8 such that the via holes 13 overlap the via holes 7. In this case, the number of laminated ceramic green sheets 12 and 15 is such that the cross-sectional area of the strip-shaped connection electrode 5 and the extraction electrode 6 is
Is set to be approximately the same as the cross-sectional area of.

Further, the ceramic green sheet 16 in which the via hole and the conductor pattern are not formed is provided.
Are laminated on the upper surface side of the ceramic green sheet 12 and the lower surface side of the ceramic green sheet 15, and then the ceramic green sheets 8, 12, 15, 1
6 is pressed along the laminating direction A to produce a laminate 17 (unfired element 1).

If the number of the ceramic green sheets 8, 12, 15, 16 as a whole is large, the laminated portions of the via holes 7 may buckle during the pressing, so that the ceramic green sheets 8, 12, 15, 16 may be buckled. When laminating a number of sheets, the ceramic green sheets 8, 12, 1
Each time one or two or more of the layers 5 and 16 are laminated, it is preferable to perform lamination while temporarily compressing at a relatively low pressure, and after laminating a predetermined number of layers, it is preferable to form a laminate by performing final compression.

Further, the ceramic green sheets 8, 1
There is no particular restriction on the stacking order of 2, 15, and 16, and the ceramic green sheets can be stacked in various arbitrary orders.

The laminate 17 manufactured as described above
In the (green element 1), the conductor patterns 10 and 14, which are formed on the ceramic green sheets 12 and 15 and serve as the strip-shaped connection electrodes 5, respectively have via holes 9 and 13.
Via holes 7 in ceramic green sheet 8
Electrically connected to the coil, the coil center axis is
Is formed inside the laminate 17.

In the actual manufacturing process, a large-area mother ceramic green sheet having via holes 7 formed therein and a large area having a large number of strip-shaped connection electrodes 5 and conductive patterns 10 and 11 serving as extraction electrodes 6 formed therein. Mother ceramic green sheet, a large-area mother ceramic green sheet having a large number of conductive patterns 14 serving as strip-shaped connection electrodes 5 formed thereon, and a large-area mother ceramic green sheet having no via hole or conductive pattern formed therein. A method of producing a laminated block (mother block) by laminating and crimping each other and then cutting and dividing this laminated block along a predetermined cutting line to simultaneously produce individual laminated bodies 17 is applied. Will be done.

In the laminated inductor according to the first embodiment, since the laminating direction A of the laminated body 17 is orthogonal to the coil center axis, a large cutting margin is required, and the processing time is long. Since it is possible to cut without using a dicing saw (grinding wheel-shaped rotary blade), it is possible to cut using a razor-shaped push-cutting blade that hardly requires a cutting allowance. It can be simplified.

Then, the unsintered laminate 17 produced as described above is degreased and fired to produce the element 1, and a conductive paste is applied to both end faces of the element 1 and baked, thereby obtaining the coil 2. Are formed with the input / output external electrodes 3 which are electrically connected to both ends. Thus, a multilayer inductor as shown in FIG. 1 is obtained. This multilayer inductor is a so-called coil-horizontal-type laminated type in which the coil 2 is in a horizontal-winding state when the input / output external electrodes 3 are positioned at both ends of the element 1 in the horizontal direction (lateral direction). Mold coil parts.

In the multilayer inductor of the first embodiment, since the lamination direction A of the element 1 and the coil center axis are orthogonal to each other, the conventional configuration in which the lamination direction A is parallel to the coil center axis is 1 kgf. The bending strength was about 3 ~
It can be increased to about 4kgf. In particular, in the case of a high-frequency inductor using a nonmagnetic ceramic mainly composed of glass, the transverse rupture strength can be increased to 5 times or more.

In this laminated inductor,
The strip-shaped connection electrode 5 and the extraction electrode 6 have a multi-layer structure, and by increasing the number of layers, the electrode thickness can be increased until a cross-sectional area equivalent to the cross-sectional area of the via hole 4 is secured. Therefore, the inductance at 100 MHz is about 10 nH in the conventional multilayer inductor, whereas the inductance at 100 MHz is about 1 nH in the multilayer inductor of the first embodiment.
It has been confirmed to be about 00 nH. In addition, as a mode of forming the strip-shaped connection electrode 5 and the extraction electrode 6 having a multi-layer structure, a plurality of ceramic green sheets each having a conductor pattern having a single-layer structure as described above are stacked, In addition to the mode in which the patterns are connected by via holes, a conductor pattern having a multi-layer structure is formed on one ceramic green sheet, a plurality of these are laminated, and the conductor patterns having the multi-layer structure are connected by via holes. Examples include an embodiment and an embodiment in which a conductor pattern having a multi-layer structure is formed on one ceramic green sheet. These are all included in the scope of the present invention.

In the first embodiment, the single coil 2 is provided inside the element 1. However, it is also possible to provide two or more coils in parallel. In the case of a multilayer inductor in which two coils are arranged in parallel,
It can also be used as a transformer. For example, 2
As shown in FIG. 3, when forming a laminated coil component in which a plurality of coils are arranged in parallel, a conductor sheet, a via hole, etc. By preparing the ceramic green sheets formed in pairs and laminating them, it is possible to manufacture them by the same method as in the case of manufacturing the multilayer inductor of the first embodiment. In FIG. 3, FIGS. 1 and 2
The same or corresponding parts are denoted by the same reference characters.

[Embodiment 2] FIG. 4 is an external perspective view showing a multilayer inductor according to another embodiment (Embodiment 2) of the present invention, and FIG. 5 is an exploded perspective view showing a multilayer body constituting the multilayer inductor. It is. In the multilayer inductor according to the second embodiment, the extraction electrode 6 having a multi-layer structure is disposed substantially at the center of the element (laminate) 1 in the lamination direction A and parallel to the lamination plane (in a direction perpendicular to the lamination direction A). Has been established. The other configuration including the entire configuration of the multilayer inductor of the second embodiment is the same as that of the multilayer inductor of the first embodiment, and therefore the description is omitted to avoid duplication. 4 and 5, the same or corresponding parts as those in FIGS. 1 and 2 are denoted by the same reference numerals.

As shown in FIG. 5, the multilayer inductor according to the second embodiment has (1) a via hole 7 for each predetermined position.
(Finally via holes 4 (FIG. 4)), and a ceramic green sheet 18 on which a conductor pattern 11 to be the extraction electrode 6 having a predetermined shape is formed, as in the case of the first embodiment (2). A ceramic green sheet 8 (8a, 8b) in which a via hole 7 (finally a via hole 4 (FIG. 4)) is formed at each predetermined position; and (3) a via hole 9 (finally, at each predetermined position) A ceramic green on which a conductive pattern 10 serving as a strip-shaped connection electrode 5 (FIG. 4) having a predetermined shape including these via holes 9 is formed. A sheet 19 and (4) via holes 13 (to be finally connected to via holes 4 (FIG. 4)) are formed at predetermined positions, and a predetermined band-like shape including these via holes 13 is formed. Connection Ceramic green sheets 20 on which the conductor pattern 14 serving as electrode 5 (Fig. 4) is formed
And (5) preparing five types of ceramic green sheets 16 for the outer layer on which no via hole and conductive pattern are formed, and according to the first embodiment, these five types of ceramic green sheets are prepared. Are laminated and pressure-bonded, and then fired and formed with external electrodes.

In the multilayer inductor according to the second embodiment, the extraction electrode 6 is arranged in the stacking direction A of the element 1 (stacked body 17).
Is arranged at substantially the center of the mounting board, it is possible to suppress the generation of stray capacitance between the electrode on the mounting board and the extraction electrode 6, and to eliminate the directionality during mounting, Workability in the process can be improved. In the multilayer inductor of the second embodiment, the same effects as those of the multilayer inductor of the first embodiment can be obtained in other respects.

[Embodiment 3] FIG. 6 is an external perspective view showing a laminated LC composite component according to still another embodiment (Embodiment 3) of the present invention. Laminated LC of Embodiment 3
In the composite component, a pair of capacitance acquisition external electrodes 40 facing the coil 2 (mainly the via hole 4) are provided so as to extend from the center of both sides of the element 1 as a laminate to the upper and lower sides. I have.

That is, the laminated LC composite component according to the third embodiment is obtained by disposing the capacitance acquiring external electrode 40 on the element 1 constituting the laminated inductor described in the first embodiment. The external electrode 40 is mainly disposed so as to face the via hole 4 forming the coil 2.

The external electrode 40 for obtaining capacitance can be formed by applying a conductive paste to a predetermined region of the element 1 and baking it, as in the case of the external electrode 3 for input and output. Other configurations including the entire configuration of the multilayer inductor of the third embodiment are the same as those of the multilayer inductor of the first embodiment, and therefore, description thereof will be omitted to avoid duplication. In FIG. 6, the same or corresponding parts as those in FIGS. 1 and 2 are denoted by the same reference numerals.

As described above, at a predetermined position on the surface of the element 1 constituting the multilayer inductor according to the first embodiment, the capacitance (in the embodiment, mainly the via hole 4 constituting the coil 2) facing the coil is used for obtaining the capacitance. Only by arranging the external electrode 40, it is possible to secure a necessary capacitance between the via hole 4 and the external electrode 40 for obtaining capacitance.
C composite parts can be easily formed.

In the third embodiment, the capacitance acquiring external electrode 40 is provided on the element 1 constituting the multilayer inductor of the first embodiment. There are no particular restrictions on the general shape, arrangement position, and the like. For example, it may be configured such that the capacitance acquisition external electrode 40 is arranged on the element 1 constituting the multilayer inductor described in the second embodiment. It is possible.

[Embodiment 4] FIG. 7 is an external perspective view showing a laminated LC composite component according to still another embodiment (Embodiment 4) of the present invention, and FIG. 8 is a laminate constituting the laminated LC composite component. It is an exploded perspective view showing a body. Embodiment 4
In the laminated type LC composite part, the element 1
In a region (upper region and lower region) 1a outside the band-shaped connection electrode 5 (FIG. 7) in the stacking direction A, a pair of capacitance acquisition internal electrodes 42 facing the band-shaped connection electrode 5 is disposed. Have been. The capacitance acquisition internal electrodes 42 are connected to a pair of ground connection external electrodes 40a that also serve as capacitance acquisition external electrodes formed on both sides of the surface of the element 1. In the multilayer LC composite component of the fourth embodiment, the upper region and the lower region 1a of the element 1 where the capacitance acquisition internal electrodes 42 are provided are formed of a material mainly composed of a dielectric ceramic. ing.

The laminated LC composite component of the fourth embodiment is
A pair of capacitance acquiring internal electrodes 4 facing the strip-shaped connection electrodes 5
2 and a ground connection external electrode 40a also serving as a capacitance acquisition external electrode to which the capacitance acquisition internal electrode 42 is connected, and further, an upper region and a lower side where the capacitance acquisition internal electrode 42 is disposed. Since the region 1a is formed from a material containing a dielectric ceramic as a main component, the third embodiment is used.
It is possible to secure a larger capacity as compared with the case of the laminated type LC composite part, and the present invention can be made more effective.

Other configurations including the entire configuration of the laminated LC composite component of the fourth embodiment are the same as those of the laminated inductor of the first embodiment and the laminated LC composite component of the third embodiment. Therefore, description is omitted to avoid duplication. 7 and 8, the same or corresponding parts as those in FIGS. 1, 2 and 6 are denoted by the same reference numerals. In FIG. 7, the internal structure of the element 1 is omitted because the capacitance acquisition internal electrode 42 and the ground connection external electrode 40a need to be shown. This is exactly the same as FIG.

Further, as shown in FIG. 8, for example, as shown in FIG. 8, the laminated type LC composite component of the fourth embodiment has (1) a via hole 7 at each predetermined position (finally a via hole 4 (see FIG. 6)). A ceramic green sheet 8 formed with
(2) Via holes 9 (finally connecting portions with via holes 4 (see FIG. 6) are formed at predetermined positions,
In addition, a conductor pattern 10 including the via holes 9 and serving as a band-shaped connection electrode 5 having a predetermined shape (see FIG. 6), and an extraction electrode 6 having a predetermined shape similar to that of the first embodiment.
And (3) a via hole 13 at each predetermined position.
(Finally, a connection portion with via hole 4 (see FIG. 6)) is formed, and conductor pattern 14 serving as band-shaped connection electrode 5 (see FIG. 6) having a predetermined shape including via holes 13 is formed. And (4) a ceramic green sheet 16 for an outer layer where no via hole and conductive pattern are formed,
(5) A ceramic green having a cross shape in a plan view, in which a conductor pattern 43 serving as an internal electrode 42 for capacitance acquisition is formed such that one end and the other end opposite to the end reach the sheet end surface. Five kinds of ceramic green sheets of the sheet 44 are prepared, and according to the case of the first embodiment,
After these five types of ceramic green sheets are laminated and pressure-bonded, they are manufactured through steps such as firing and formation of external electrodes.

It should be noted that the present invention is not limited to the first to fourth embodiments, and various applications and modifications can be made within the scope of the invention.

[0056]

As described above, the laminated coil component of the present invention (Claim 1) is characterized in that one end of one of the plurality of via holes in the laminating direction of the predetermined via hole and one of the predetermined via holes are formed. The other end portions in the stacking direction are connected to each other by a strip-shaped connection electrode having a multi-layer structure disposed in parallel (in a direction orthogonal to the stacking direction) with the stacking surface, and a coil whose central axis is orthogonal to the stacking direction. And the coil is connected to the input / output external electrode by a multi-layered lead electrode arranged in parallel with the lamination surface, so that the conductor resistance can be reduced without increasing the size of the product. Can be reduced. That is, the thickness of the strip-shaped connection electrode and the extraction electrode is increased (the number of layers is increased) until the cross-section area equivalent to the electrode cross-section area of the via hole is secured in a multi-layer structure of the strip-shaped connection electrode and the extraction electrode. In addition, it is possible to reduce the conductor resistance without impairing the miniaturization and improve the responsiveness to a large current.

When the extraction electrode is disposed near the outermost layer of the laminate, a floating capacitance may be generated between the electrode on the mounting board and the extraction electrode, deteriorating high-frequency characteristics. It is necessary to consider the directionality at the time of mounting because it may be easier. However, as in the laminated coil component of claim 2, the extraction electrode is disposed substantially at the center of the laminated body in the laminating direction and is laminated. If it is arranged parallel to the surface, it is possible to suppress the generation of stray capacitance between the electrode on the mounting board and the extraction electrode, and it is possible to eliminate the directionality during mounting and to reduce the mounting process. Operability can be improved.

Further, in the case of the laminated coil component according to the third aspect, a capacitance acquiring external electrode facing the coil constituted by the via hole and the strip-shaped connection electrode is provided on the surface of the laminated body. By simply arranging the external electrode for capacitance acquisition on the surface of the laminate, it is possible to secure the required capacitance between the via hole and the external electrode for capacitance acquisition, and the laminated LC composite component can be easily manufactured. Can be configured.

Further, as in the laminated coil component of the fourth aspect, the capacitance acquisition internal electrode facing the band-shaped connection electrode is provided in at least one region on one side and the other side outside the band-shaped connection electrode in the lamination direction. 4. In the case of the laminated coil component according to claim 3, wherein the external electrode for ground connection is disposed on the surface of the laminate, and the internal electrode for capacitance acquisition is connected to the external electrode for ground connection. A larger capacity can be secured, and the degree of freedom in characteristic design can be improved.

Further, in the case where the region of the laminated body where the capacitance acquiring internal electrode is provided is made of a material mainly composed of a dielectric ceramic, as in the laminated coil component of the present invention, A larger capacity can be secured, and the present invention can be made more effective.

In the method of manufacturing a laminated coil component according to the present invention (claim 6), a laser beam separated by a diffraction grating is irradiated to form a through hole in a ceramic green sheet, and then a conductive hole is formed in the through hole. Since the via hole is formed by filling the paste, it is possible to form a highly accurate through-hole in the ceramic green sheet extremely efficiently, and the laminated coil component of the present invention can be efficiently formed. Can be manufactured. Further, according to the method of irradiating a laser beam, it is possible to form a fine and high-precision via hole, and thus it is possible to form a coil having the same product dimensions and a large number of turns.

Further, as in the method for manufacturing a laminated coil component according to the seventh aspect, each time one or two or more ceramic green sheets are laminated, the green sheets are laminated while being temporarily press-bonded. By crimping, it is possible to reliably form a desired laminated body without causing displacement of the coil pattern, and the laminated coil component of the present invention can be manufactured more efficiently.

[Brief description of the drawings]

FIG. 1 is an external perspective view showing a multilayer inductor according to an embodiment (Embodiment 1) of the present invention.

FIG. 2 is an exploded perspective view showing a multilayer body constituting the multilayer inductor according to the first embodiment.

FIG. 3 is an exploded perspective view showing a multilayer body according to a modification of the multilayer inductor of the first embodiment.

FIG. 4 is an external perspective view showing a multilayer inductor according to another embodiment (Embodiment 2) of the present invention.

FIG. 5 is an exploded perspective view showing a multilayer body constituting the multilayer inductor according to the second embodiment.

FIG. 6 shows still another embodiment of the present invention (Embodiment 3).
1 is an external perspective view showing a laminated LC composite component according to the first embodiment.

FIG. 7 shows still another embodiment of the present invention (Embodiment 4).
1 is an external perspective view showing a laminated LC composite component according to the first embodiment.

FIG. 8 is an exploded perspective view showing a laminate constituting the laminated LC composite component according to the fourth embodiment.

FIG. 9 is an external perspective view showing a conventional multilayer inductor.

FIG. 10 is an exploded perspective view showing a multilayer body constituting a conventional multilayer inductor.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Element (laminated body) 1a Upper area and lower area of element 2 Coil 3 I / O external electrode 4, 7, 9, 13 Via hole 5 Strip connection electrode 6 Extraction electrode 8 (8a, 8b), 12, 15, 16, 18, 19, 2
0,44 Ceramic green sheet 10, 11, 14, 43 Conductor pattern 17 Unfired laminate 40 External electrode for capacity acquisition 40a External electrode for ground connection 42 Internal electrode for capacity acquisition A Stacking direction

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Gen Arakawa 2-26-10 Tenjin, Nagaokakyo-shi, Kyoto F-term in Murata Manufacturing Co., Ltd. (Reference) 5E062 DD04 5E070 AA01 AA05 BA12 CB04 CB13 CB17

Claims (7)

[Claims] A coil surrounding a coil central axis orthogonal to a laminating direction is provided inside a laminated body, and input / output external electrodes electrically connected to both ends of the coil are disposed on both end surfaces of the laminated body. A laminated coil component having a structure provided, wherein a via hole is provided at a plurality of positions inside the laminated body as viewed from the laminating direction such that the axis is along the laminating direction, and Is disposed in parallel with the stacking surface, by connecting one end of the predetermined via hole in the stacking direction and the other end of the predetermined via hole in the stacking direction, in cooperation with the via hole. A multi-layered band-shaped connection electrode constituting a coil having a coil center axis orthogonal to the laminating direction; and the coil disposed inside the laminate in parallel with the lamination surface and comprising a via hole and a band-shaped connection electrode. The input / output external electrode Laminated coil component characterized by comprising a lead electrode of the multilayer structure to continue. 2. The laminated coil component according to claim 1, wherein the extraction electrode is disposed substantially at the center of the laminated body in the laminating direction and parallel to the laminating surface. 3. The laminate according to claim 1, wherein an external electrode for obtaining a capacitance is provided on a surface of the laminate, the external electrode being provided with a via hole and a strip-shaped connection electrode and facing the coil. Type coil parts. 4. A capacity acquisition internal electrode facing the band-shaped connection electrode is provided in at least one region on the one side and the other side outside the band-shaped connection electrode in the stacking direction inside the laminate. 4. The laminated coil according to claim 3, wherein an external electrode for ground connection is provided on the surface of the multilayer body, and the internal electrode for capacitance acquisition is connected to the external electrode for ground connection. parts. 5. The laminate type according to claim 3, wherein a region of the laminate in which the capacitance acquiring internal electrodes are disposed is formed of a material mainly composed of a dielectric ceramic. Coil parts. 6. A method for manufacturing a laminated coil component according to claim 1, wherein a through-hole is formed in the ceramic green sheet by irradiating a laser beam separated by a diffraction grating. And forming a via hole by filling the through hole with a conductive paste. 7. When laminating the ceramic green sheets having the via holes formed therein to form a laminate, the ceramic green sheets are laminated while temporarily compressing each time one or more ceramic green sheets are laminated. 7. The method for manufacturing a laminated coil component according to claim 6, wherein the laminated body is formed by laminating a number of pieces and then performing full pressure bonding.