JPH1167554A - Laminated coil component and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To form efficiently outer electrodes without reducing the mountability of the outer electrodes to a circuit board, by a method wherein the outer electrodes consisting of a plated film are formed on the exposed parts of a plurality of electrode layers, at least one layer of which is made to have continuity with a coil. SOLUTION: A prescribed number of sheets of ceramic green sheets, which are respectively provided with an inner electrodes, are laminated. Ceramic green sheets, which are respectively formed with a plurality of electrode layers 13, are respectively laminated on the upper and lower surfaces and both side surfaces of the laminated material provided with the inner electrodes. The laminated ceramic green sheets, which are respectively formed with the plurality of the electrode layers 13, are pressure bonded to the laminated material provided with the inner electrodes to form a laminated material 26. At this time, the inner electrodes are made to have continuity with at least one layer of the plurality of the electrode layers 13. This laminated material 26 is subjected to firing and after that, an electroplating method is performed on both upper and lower surface side electrode layers 11a and 11b, which are the uppermost and lowest layers of the plurality of the electrode layers of the laminated material 26, and the exposed parts 13a, which are exposed on the side surfaces of the material 26, of the plurality of the electrode layers to form outer electrodes 3a and 3b, which consist of a plated film, on the exposed parts of the electrode lasers. As a result, the outer electrodes are efficiently formed and a reduction in the production cost of a laminated coil component t is contrived.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to an inductor and an LC
More particularly, the present invention relates to a laminated coil component such as a laminated inductor or a laminated LC composite component having a laminated coil disposed in an element and a method of manufacturing the same.

[0002]

2. Description of the Related Art A laminated inductor is one of the typical laminated coil components. In this laminated inductor, for example, as shown in FIGS. 13 and 14, a laminated coil 52 is provided in an element 51 and both ends 5 of the coil 52 are arranged.
The coils 5a and 52b are exposed on the end faces (side faces) parallel to the stacking direction A (the direction indicated by the arrow) and facing each other.
External electrodes 5 so as to be connected to both ends 52a, 52b of the
3a and 53b (FIGS. 13 and 14).

[0003] Such a laminated inductor is conventionally manufactured by the following method. First, FIG.
As shown in FIG. 0, a via hole 62 is formed at a predetermined position of the ceramic green sheet 61b, and, for example, A is formed at a predetermined position including the position where the via hole 62 is formed.
g of the internal electrode (coil 5
2) are formed (printed), a predetermined number of the ceramic green sheets 61b are stacked, and internal electrodes are formed on the upper surface side and the lower surface side of the ceramic green sheet 61b on which the internal electrodes 63 forming the coil 52 are printed. Unprinted ceramic green sheet 61
By stacking and crimping a, a laminated body (unfired element) 64 (FIGS. 10 and 12) in which a coil 52 whose axis is parallel to the laminating direction A is formed inside is formed.

As a result, the internal electrodes 63 of each ceramic green sheet 61b are connected via the via holes 62, and the coils 52 (FIGS. 12 and 13) are formed. Further, both ends 52a and 52b of the coil 52 formed inside the multilayer body 64 are exposed on side surfaces (cut end surfaces) 64a and 64b (FIG. 12) of the multilayer body 64, respectively.

In an actual manufacturing process, a ceramic green sheet having a large area on which a plurality of internal electrodes (conductor patterns) are printed and a ceramic green sheet on which no internal electrodes are printed are laminated, as shown in FIG. The laminated block 65 is formed.
5 is cut in the stacking direction A along the cutting lines 66 and 67 to be divided into individual stacked bodies 64.

After firing the laminate 64,
As shown in FIG. 12, the fired laminate 64 (element 51)
A conductive paste is applied to the cut end surfaces 64a and 64b where both ends 52a and 52b of the coil 52 are exposed, and the external electrodes 53a and 53b are baked (FIGS. 13 and 14).
To form In addition, in order to improve the solderability, for example, a two-layer plating film made of nickel in the lower layer and tin or solder in the upper layer is often provided on the surfaces of the external electrodes 53a and 53b.

[0007]

However, in the above-described conventional method for manufacturing a laminated inductor, both ends 52a and 52b of the coil 52 constituting each element are placed inside the unfired laminated block 65 (FIG. 11). Located, cutting line 6
Only after cutting along 6, 67, the cut end face 64
a, 64b (FIG. 12), after the cutting step, a step of applying a conductive paste for forming external electrodes to the cut end faces 64a, 64b and a step of baking the applied conductive paste are required. In addition, there is a problem that not only a jig for applying the conductive paste is required, but also the manufacturing process is complicated and the cost is increased. Also,
In the above conventional example, the external electrodes 53a and 53b are
Are connected only to the end portions 52a, 52b of the first and second electrodes 52a, 52b, so that there is a problem that the fixing force of the external electrodes 53a, 53b to the element 51 is low, and the connection reliability is low.

Further, the above problem is not limited to the case of the multilayer inductor, but also applies to a multilayer LC composite component having a multilayer coil disposed in an element.

The present invention has been made to solve the above-mentioned problems, and it is possible to efficiently form an external electrode without deteriorating the mountability on a circuit board, and furthermore, to provide a laminated coil excellent in connection reliability. It is an object to provide a component and a method for manufacturing the same.

[0010]

In order to achieve the above object, a laminated coil component according to the present invention (claim 1) is provided by connecting a plurality of laminated internal electrodes via an insulator. In a laminated coil component in which external electrodes are disposed on the surface of a laminate in which a laminated coil is formed inside a body, the laminated coil component is disposed on at least a part of a peripheral portion on both upper and lower sides in a laminating direction of the laminated body. Electrode layers (upper and lower electrode layers) and
External electrodes made of a plating film are exposed on exposed portions of a plurality of electrode layers (a plurality of electrode layers) that are exposed at predetermined intervals on a surface substantially parallel to the stacking direction of the stacked body and at least one layer is electrically connected to the coil. It is characterized by being formed.

Since the external electrodes can be formed directly on the exposed portions of the upper and lower electrode layers and the plurality of electrode layers by plating, the conductive paste is applied and then baked as in a conventional laminated coil component. It is possible to efficiently form the external electrodes without requiring a complicated process such as that described above, a jig for applying the conductive paste, and the like, and to reduce the manufacturing cost. Furthermore, since the external electrode is connected to the electrode (multiple electrode layers) at a plurality of locations, the fixing force of the external electrode is improved,
Connection reliability is improved.

In the laminated coil component of the present invention (claim 2), the upper and lower electrode layers and the external electrode formed of a plating film formed on the exposed portions of the plurality of electrode layers are integrated into one continuous It is characterized in that an electrode film is formed.

When one continuous electrode film is formed by integrating upper and lower electrode layers and external electrodes formed of plated films formed on exposed portions of the plurality of electrode layers, the external electrodes are formed into a laminate. It is possible to firmly fix the connection, and it is possible to further improve the connection reliability.

Further, in the laminated coil component of the present invention (claim 3), the distance between each of the electrode layers constituting the plurality of electrode layers, and the upper and lower both-side electrode layers and the upper and lower both-side electrode layers are adjacent to each other. The distance between the plurality of electrode layers is 70 μm or less.

This makes it possible to integrate the external electrodes formed by plating by growing the plating film in the plating step to form one continuous electrode film as a whole, thereby making the present invention more effective. be able to.

In the laminated coil component of the present invention (claim 4), a plurality of internal electrodes are connected by via holes to form a coil whose axis is substantially parallel to the laminating direction of the laminated body. An external electrode that is electrically connected to the coil is formed at a position near both ends of the laminate in the axial direction of the coil.

This makes it possible to obtain a so-called coil-horizontal-type laminated coil component in which the coil is in a horizontal-winding state when the external electrodes are positioned at both ends in the horizontal direction. It is possible to increase.

In the laminated coil component of the present invention (claim 5), a plurality of internal electrodes are connected by via holes to form a coil whose axis is substantially parallel to the laminating direction of the laminated body. , Substantially parallel to the lamination direction of the laminate, and
An external electrode which is electrically connected to the coil is formed on the opposing surface and in the vicinity thereof.

According to the present invention, there is provided a so-called coil vertical winding type laminated coil in which external electrodes are arranged on both ends in a direction orthogonal to the axial direction of the coil by selecting the drawing positions on both ends of the coil. It can also be applied to parts.

Further, the laminated coil component according to the present invention (claim 6) is characterized in that the laminated coil component is a laminated inductor and the coil functions as an inductance element.

When the present invention is applied to a multilayer inductor, an external electrode can be formed efficiently without deteriorating the mountability on a circuit board, and a multilayer inductor having excellent connection reliability can be obtained. Can be.

The method of manufacturing a laminated coil component of the present invention (claim 7) relates to the method of manufacturing a laminated coil component of the present invention, wherein a plurality of laminated coil components are laminated inside an insulator. Are formed, and an electrode layer (upper and lower electrode layers) is disposed on at least a part of a peripheral portion of both upper and lower surfaces in the laminating direction. At predetermined intervals on a substantially parallel surface, a laminate is formed in which a plurality of electrode layers (a plurality of electrode layers) at least one of which is electrically connected to the coil are exposed. In addition, by directly plating the exposed portions of the plurality of electrode layers, external electrodes formed of a plating film are formed on the surface of the laminate.

As a result, it is possible to efficiently form external electrodes without deteriorating the mountability on a circuit board, and to efficiently manufacture a laminated coil component having excellent connection reliability. The present invention can be made more effective.

[0024]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described, and features thereof will be described in more detail. In the following embodiments of the present invention, a laminated inductor in which a coil is provided in a magnetic ceramic and a method of manufacturing the same will be described as an example.

[First Embodiment] FIG. 1 is an exploded perspective view of a laminate constituting a laminated inductor according to this embodiment, FIG. 2 is a perspective view showing the laminate before external electrodes are provided, and FIG.
Is a multilayer inductor after external electrodes are formed (finished product)
FIG. 4 is a sectional view of the multilayer inductor according to this embodiment.

As shown in FIGS. 3 and 4, the laminated inductor according to this embodiment has the laminated coil 2 disposed in the element 1 (laminate 26) and the coil 2 on the surface of the element 1. It is formed by disposing conductive external electrodes 3a and 3b. Note that the external electrodes 3a and 3b are exposed at both ends (upper and lower sides in FIG. 2) of the side surfaces facing each other in parallel with the stacking direction A of the element 1, and are exposed at both ends 2a and 2b (FIG. , FIG. 3), the exposed portions 13a of the plurality of electrode layers (multiple electrode layers) 13 and the upper and lower electrode layers (upper and lower electrode layers) 11a, 1
1b (FIGS. 1 and 2).

The external electrodes 3a and 3b are formed of upper and lower electrode layers 11a and 11b and a plurality of electrode layers 13 which are exposed at a predetermined interval on surfaces opposing each other substantially parallel to the stacking direction of the element 1. The exposed portion 13a (FIG. 2) is formed by electroplating. Further, the upper and lower surfaces of the electrode layers 11a and 11b and the exposed portions 13a of the multiple electrode layers 13
As shown in FIGS. 3 and 4, the external electrodes 3a and 3b formed as described above are integrated by forming a plating film in a plating step to form one continuous electrode film. Note that the multilayer inductor according to the first embodiment includes external electrodes 3a, 3
This is a so-called coil horizontal winding type laminated coil component in which the coil 2 is in a horizontal winding state when b is located at both ends in the horizontal direction.

Next, a method of manufacturing the multilayer inductor will be described. First, as shown in FIG. 1, a via hole 22 is formed at a predetermined position, and a via hole 2 is formed.
The ceramic green sheet 21b on which the internal electrode (conductor pattern) 12 is disposed by printing a conductive paste containing Ag as a main component, for example, at a predetermined position including the position where the second electrode 2 is formed, and a via hole at a predetermined position. A ceramic green sheet 21a on which electrodes 22 (a plurality of electrode layers) are formed on the front and back main surfaces is prepared.

It is possible to use a ceramic green sheet formed by a method such as a doctor blade method or a pulling-up method. Further, as the ceramic material, Ni-Zn based, Ni-Zn-Cu
It is possible to use either a magnetic ceramic such as a ceramic or a non-magnetic ceramic for an air-core coil.

Then, the internal electrodes (conductor patterns) 12
Are laminated and a plurality of ceramic green sheets 21b having electrodes (multiple electrode layers) 13 formed on both upper and lower surfaces thereof are formed on both upper and lower surfaces of the ceramic green sheets 21b. FIG. 2
As shown in (2), a laminate 26 (unfired element 1) is formed.

As a result, the internal electrodes 12 are electrically connected by the via holes 22 to form the coil 2 (FIGS. 3 and 4) in which the laminating direction is parallel to the axial direction.
Plural electrode layers 13 provided on green sheet 21a
Are also electrically connected by via holes 22.

The peripheral portion of the plurality of electrode layers 13 formed on the ceramic green sheet 21a is exposed to four side surfaces of the laminate 26, that is, an end surface parallel to the laminating direction to become an exposed portion 13a. In the actual manufacturing process, a ceramic green sheet having a large area on which a plurality of internal electrodes (conductor patterns) are printed and a ceramic green sheet having electrodes formed on the entire surfaces of both main surfaces are laminated, as shown in FIG. Such a laminated block 27 is formed, and the laminated block 27 is cut along the cutting lines 28 and 29 in the laminating direction A to be divided into individual laminated bodies 26.

After firing the laminate 26,
Upper and lower surface side electrode layers 1 of laminate 26 (element 1) (FIG. 2)
1a and 11b (that is, the uppermost layer and the lowermost layer of the multiple electrode layers 13) and the multiple electrode layers 1 exposed on the side surfaces of the stacked body 26
The exposed portion 13a of FIG.
As shown in FIG. 4, the external electrodes 3a, 3
b is formed. In this embodiment, two-layer plating films (not shown) made of nickel on the lower layer and tin or solder on the upper layer to improve the solderability on the surfaces of the external electrodes 3a and 3b made of the plating film. Was given.

In this embodiment, the distance between each of the plurality of electrode layers 13 and the number of the plurality of electrode layers 13 adjacent to the upper and lower electrode layers 11a and 11b in the fired laminate 26 are described.
Is set to be equal to or less than 70 μm, the plating film formed on the exposed portion of the multiple electrode layer 13 grows to have a thickness greater than or equal to the thickness of the multiple electrode layer 13 in the plating step. As described above, the external electrodes 3a and 3b formed of one continuous electrode film
Is formed.

Further, in the multilayer inductor of this embodiment, since the external electrodes 3a and 3b are formed by electroplating, solderability with a wiring path on a circuit board when mounted and used is used. Also, it has excellent solder heat resistance and high connection reliability can be obtained. In addition, since the plated electrodes are formed directly on the upper and lower electrode layers 11a and 11b, the steps of applying and baking a conductive paste for forming external electrodes, which are required in the above-described conventional manufacturing method, are not required. And the manufacturing process can be simplified.

The external electrodes 3a and 3b are
Since it is formed not only on the surfaces of the upper and lower surface side electrode layers 11a and 11b of (Element 1) but also on the surface of the exposed portion 13a of the plurality of electrode layers 13 exposed on the side surfaces of the stacked body 26 (Element 1). The bonding force with the wiring path on the circuit board is also increased, and the rising of the chip during mounting can be prevented. Furthermore, since the external electrodes 3a and 3b are joined to the exposed portions 13a of the multiple electrode layers 13 at a plurality of locations, the fixing force of the external electrodes 3a and 3b to the element 1 is improved, and the connection reliability is improved.

[Second Embodiment] In the first embodiment, the case where both the upper and lower electrode layers 11a and 11b and the plurality of electrode layers 13 are formed by applying electrodes to the entire surface of the ceramic green sheet 21a. As described above, as shown in FIG. 6 and FIG.
With respect to the multiple electrode layers 13 other than a and 11b, an annular pattern without an electrode film at the center can also be used.
In the multilayer inductor of the second embodiment,
The electrode 11 is also provided on the peripheral portion on the back surface side of the ceramic green sheet 21a on which the upper and lower surface side electrode layers 11a and 11b are formed.
c, 11d are formed.

As shown in FIG. 6, the laminated inductor according to the second embodiment also includes a ceramic green sheet 21b on which predetermined internal electrodes 12 are provided,
a, 11b or a plurality of ceramic green sheets 21a on which a plurality of electrode layers 13 are formed are laminated and pressed, and the respective electrodes are easily connected to each other via via holes 22, and are easily manufactured by the same method as in the first embodiment. It is possible. In FIGS. 6 and 7, portions denoted by the same reference numerals as those in FIGS. 1 to 4 indicate the same or corresponding portions.

Also in the case of the multilayer inductor according to the second embodiment, since the plurality of electrode layers 13 are exposed on the side surfaces of the multilayer body 26, the upper and lower electrode layers 11a and 11b and the plurality of electrode layers 1
The external electrodes 3a made of a plating film are
By forming 3b, the same effect as in the first embodiment can be obtained.

Further, in the case of the multilayer inductor of the second embodiment, it is possible to reduce the cost by reducing the amount of electrode material used.

Also, in the case of the second embodiment,
In order to improve the solderability, the external electrodes 3a, 3b
Needless to say, a two-layer plating film made of, for example, nickel in the lower layer and tin or solder in the upper layer may be provided on the surface of the substrate.

[Embodiment 3] FIGS. 8 and 9 are exploded perspective views showing the configuration of a multilayer inductor according to still another embodiment of the present invention. As shown in FIGS. 8 and 9, the multilayer inductor according to the third embodiment has an element 1
(Laminated body 26) is formed by disposing the laminated coil 2 (FIG. 9) and disposing external electrodes 3a and 3b (FIG. 9) on the surface of the element 1 to conduct with the coil 2. I have. Note that the external electrodes 3a and 3b are exposed from the exposed portions 13a of the multiple electrode layers 13 which are exposed from the upper surface to the lower surface of the opposing side surfaces parallel to each other in the stacking direction A of the device 1.
And on the upper and lower electrode layers (upper and lower electrode layers) 11 a and 11 b of the element 1.

The external electrodes 3a and 3b are composed of the exposed portions 13a of the plurality of electrode layers 13 and the upper and lower electrode layers 11a and 1b.
1b is formed by electroplating,
One continuous electrode film extending from the upper surface side to the lower surface side of the laminate is integrated by growing the plating film in the plating step. In the third embodiment, a so-called coil vertical winding type laminated coil component in which the coil 2 is in a vertical winding state when the external electrodes 3a and 3b are positioned at both ends in the horizontal direction is obtained.

As shown in FIG. 8, this multilayer inductor also has no internal electrodes, and has upper and lower electrode layers 11a, 11b.
11b (the uppermost layer and the lowermost layer of the plurality of electrode layers 13) are formed on both ends of the ceramic green sheet 31a, the laminate 2
The ceramic green sheet 31b on which the plurality of electrode layers 13 exposed on the side surfaces of the ceramic green sheet 31a are formed (may be substantially the same as the ceramic green sheet 31a on which the upper and lower surface side electrode layers 11a and 11b are formed) and the coil 2 Green sheet 31c on which the internal electrode 12 and the plurality of electrode layers 13 exposed on the side surfaces of the laminate 26 are formed.
Can be easily manufactured by a method similar to that of the first embodiment through a process of laminating and crimping and connecting each electrode by a via hole 22.

In FIGS. 8 and 9, the same reference numerals as those in FIGS. 1 to 4 denote the same or corresponding parts.
In the case of the multilayer inductor of this embodiment, since the external electrodes 3a and 3b are formed on the exposed portions 13a of the multiple electrode layer 13 which are exposed from the upper part to the lower part of the side surface of the multilayer body 26, the first embodiment is used. As a result, it is possible to form an external electrode having a larger fixing force than that of the cases 2 and 2 and having excellent connection reliability.

In the case of the third embodiment,
In order to improve the solderability, the external electrodes 3a, 3b
Needless to say, a two-layer plating film made of, for example, nickel in the lower layer and tin or solder in the upper layer may be provided on the surface of the substrate.

In the above embodiment, the multilayer inductor and the method of manufacturing the multilayer inductor have been described as examples. However, the present invention is not limited to the multilayer inductor, and the multilayer coil is provided in the element. It can be applied to various laminated coil components such as laminated LC composite components.

The present invention is not limited to the above-described embodiment, but includes the types of the internal electrodes constituting the coil, the upper and lower surfaces, and the electrode materials constituting the plurality of electrode layers.
With respect to the electrode pattern, plating conditions for forming the external electrodes, and the like, various applications and modifications can be made within the scope of the present invention.

[0049]

As described above, in the laminated coil component according to the first aspect of the present invention, the external electrodes can be formed directly on the exposed portions of the upper and lower electrode layers and the plurality of electrode layers by plating. Efficient formation of external electrodes without the need for a complicated process of applying a conductive paste and baking it, as in a conventional laminated coil component, and without the need for a jig for applying the conductive paste. It is possible to reduce the manufacturing cost. Furthermore, since the external electrode is connected to the electrode (multiple electrode layers) at a plurality of locations, the fixing force of the external electrode is improved,
Connection reliability is improved.

Further, as in the laminated coil component according to the second aspect, the upper and lower surface side electrode layers and the external electrodes formed of the plating films formed on the exposed portions of the plurality of electrode layers are integrated into one continuous electrode film. Is formed, the external electrodes can be securely fixed to the laminate, and the connection reliability can be further improved.

Further, as in the laminated coil component of the third aspect, the interval between the electrode layers constituting the plurality of electrode layers and the interval between the upper and lower both-side electrode layers and the plurality of electrode layers adjacent to the upper and lower both-side electrode layers are set. When the thickness is 70 μm or less, external electrodes formed by plating can be integrated into one continuous electrode film as a whole by growing a plating film in a plating step, thereby making the present invention more effective. be able to.

Further, according to the laminated coil component of the fourth aspect, a so-called coil laterally wound type laminated coil component is obtained in which the coil is in a horizontal winding state when the external electrodes are in the postures at both ends in the horizontal direction. And the degree of freedom in design can be increased.

According to the laminated coil component of the fifth aspect, a so-called vertical coil type laminated coil component in which external electrodes are disposed on both ends in a direction orthogonal to the axial direction of the coil is obtained. It is also possible.

Further, when the present invention is applied to a multilayer inductor as in the multilayer coil component of claim 6, it is possible to efficiently form external electrodes without deteriorating the mountability on a circuit board. It is possible to obtain a simple multilayer inductor.

According to the method of manufacturing a laminated coil component of the present invention (claim 7), external electrodes can be efficiently formed without deteriorating the mountability on a circuit board. It is possible to efficiently manufacture a laminated coil component having excellent reliability, and the present invention can be made more effective.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a laminate constituting a multilayer coil component (multilayer inductor) according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a laminated body before disposing external electrodes formed in a process of manufacturing the laminated inductor according to the embodiment of the present invention.

FIG. 3 is a perspective view showing a multilayer inductor according to one embodiment of the present invention.

FIG. 4 is a cross-sectional view of the multilayer inductor according to one embodiment of the present invention.

FIG. 5 is a view showing one step of a method of manufacturing a multilayer inductor according to one embodiment of the present invention.

FIG. 6 is an exploded perspective view of a multilayer body constituting a multilayer coil component (multilayer inductor) according to another embodiment of the present invention.

FIG. 7 is a sectional view of a multilayer inductor according to another embodiment of the present invention.

FIG. 8 is an exploded perspective view of a laminate constituting a multilayer coil component (multilayer inductor) according to still another embodiment of the present invention.

FIG. 9 is a sectional view of a multilayer inductor according to still another embodiment of the present invention.

FIG. 10 is an exploded perspective view of a laminated body constituting a conventional laminated coil component (laminated inductor).

FIG. 11 is a diagram showing a method for manufacturing a conventional multilayer inductor.

FIG. 12 is a perspective view showing a laminate before disposing external electrodes formed in a process of manufacturing a conventional laminated coil component.

FIG. 13 is a perspective view showing a conventional multilayer inductor.

FIG. 14 is a cross-sectional view of a conventional multilayer inductor.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Element 2 Coil 2a, 2b Both ends of coil 3a, 3b External electrode 11a, 11b Upper and lower surface side electrode layers 11c, 11d Electrode 12 Internal electrode 13 Multiple electrode layers 13a Exposed portion of multiple electrode layers 21a Upper and lower surface side electrode layers / multiple Ceramic green sheet 21b on which electrode layers are formed Ceramic green sheet 22 on which internal electrodes are formed 22 Via hole 27 Laminated block 26 Laminated body 28, 29 Cutting line 31a Ceramic green sheet 31b on which both upper and lower electrode layers are formed 31b Multiple electrode layers Ceramic green sheet 31c on which both internal electrodes and a plurality of electrode layers are formed A Stacking direction

Claims (7)

[Claims] 1. A laminated structure in which a plurality of laminated internal electrodes are connected via an insulator to form an external electrode on a surface of a laminated body having a laminated coil formed inside the insulator. In the die coil component, an electrode layer (upper and lower surface side electrode layers) disposed on at least a part of a peripheral portion on both upper and lower sides in the stacking direction of the laminate and a surface substantially parallel to the stacking direction of the laminate are provided with predetermined A laminated coil component, wherein external electrodes made of a plating film are formed on exposed portions of a plurality of electrode layers (a plurality of electrode layers) which are exposed at intervals and at least one of which is electrically connected to the coil. 2. The method according to claim 1, wherein said upper and lower electrode layers and an external electrode comprising a plating film formed on exposed portions of said plurality of electrode layers are integrated to form one continuous electrode film. Item 2. The laminated coil component according to Item 1. 3. The method according to claim 1, wherein an interval between the electrode layers constituting the plurality of electrode layers and an interval between the upper and lower electrode layers and the plurality of electrode layers adjacent to the upper and lower electrode layers are 70 μm or less. The multilayer coil component according to claim 1 or 2, wherein 4. A plurality of internal electrodes are connected by via holes to form a coil whose axis is substantially parallel to the laminating direction of the laminate, and both ends of the laminate in the axial direction of the coil. The laminated coil component according to any one of claims 1 to 3, wherein an external electrode that is electrically connected to the coil is formed at a position close to the coil. 5. A plurality of internal electrodes are connected by via holes to form a coil whose axis is substantially parallel to the stacking direction of the stacked body, and is substantially parallel to and opposed to the stacking direction of the stacked body. An external electrode which is electrically connected to the coil is formed on a surface to be formed and in the vicinity thereof.
A laminated coil component according to any one of the above. 6. The multilayer coil component according to claim 1, wherein the multilayer coil component is a multilayer inductor, and the coil functions as an inductance element. 7. A laminated coil formed by connecting a plurality of laminated internal electrodes inside an insulator, and an electrode layer (up and down) is formed on at least a part of a peripheral portion on both upper and lower surfaces in the laminating direction. A laminate in which a plurality of electrode layers (multiple electrode layers), at least one layer of which is electrically connected to the coil, are exposed at predetermined intervals on a surface substantially parallel to the laminating direction, on both surfaces of which the electrode layers are disposed. Forming an external electrode made of a plating film on the surface of the laminate by directly applying a plating to the exposed portions of the upper and lower electrode layers and the plurality of electrode layers of the laminate. The method for manufacturing a laminated coil component according to any one of claims 1 to 6.