JP2002151354A - Laminated electronic component - Google Patents

Abstract

PROBLEM TO BE SOLVED: To further improve the reliability of a laminated electronic component. SOLUTION: An upper layer of an LC composite component 10 is an inductor 12, which is formed by laminating a magnetic substance of a Ni-Cu-Zn ferrite, containing NiO. A lower layer of the LC composite component 10 is a capacitor 14, which is formed by laminating a dielectric of TiO2 ceramic containing NiO. An intermediate layer 16 is interposed therebetween, which is made up of a nonmagnetic substance of Cu-Zn ferrite which does not contain NiO. The materials are selected, so as to have a difference of 15 mol% or less between a NiO content of Ni-Cu-Zn ferrite, which constitutes the inductor 12, and a NiO content of TiO2 ceramic, which constitutes the capacitor 14.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laminated electronic component having further improved reliability, and is particularly suitable as an LC composite component in which an inductor and a capacitor are continuously laminated.

[0002]

2. Description of the Related Art In recent years, demands for downsizing and weight reduction of devices in which electronic parts are incorporated have increased, and accordingly, demand for small-sized laminated electronic parts has rapidly increased. In addition, with the spread of the market for such devices, laminated electronic components have come to be used for various devices. Inductors and capacitors are known as such multilayer electronic components. However, due to the high degree of miniaturization and high integration, an LC composite in which these inductors and capacitors are continuously laminated and integrated is known. Parts are attracting attention.

[0003]

Further, this LC composite component has a magnetic material made of a general Ni--Cu--Zn ferrite as an inductor and a dielectric material made of a TiO ₂ ceramic containing NiO as a capacitor. Each is completed by being laminated and integrated. However, when an inductor in which a magnetic material of a Ni-Cu-Zn-based ferrite is laminated and a capacitor in which a dielectric material of a TiO ₂ -based ceramic is laminated are integrated, NiO which is a component of each other is present at a boundary between them. There is a risk that the segregation and the NiO segregate may cause a decrease in insulation resistance and cracks in the portion where the NiO is segregated, and thus the reliability of the LC composite component is reduced.

The present invention has been made in view of the above circumstances, and has as its object to provide a laminated electronic component capable of further improving reliability.

[0005]

According to a first aspect of the present invention, there is provided a multilayer electronic component comprising: an inductor unit using a magnetic material containing NiO;
A capacitor using a dielectric material containing NiO is a laminated electronic component integrated with a capacitor, and an intermediate layer made of a non-magnetic material is arranged between the inductor portion and the capacitor portion. Difference between the dielectric constant and the NiO content of the dielectric is 1
It is characterized by being at most 5 mol%.

The operation of the electronic component according to the first aspect will be described below. In the laminated electronic component of the present invention, an inductor portion using a magnetic material containing NiO and a capacitor portion using a dielectric material containing NiO are integrated, and a portion between the inductor portion and the capacitor portion is not provided. It has a structure in which an intermediate layer made of a magnetic material is arranged. Then, the difference between the NiO content of these magnetic materials and the NiO content of the dielectric is 15 mo.
1% or less.

Therefore, an intermediate layer is arranged between the inductor portion and the capacitor portion, and the difference in NiO content is reduced by one.
By setting the content to 5 mol% or less, NiO does not segregate between the inductor portion and the capacitor portion. As a result, there is no possibility that the insulation resistance is reduced and the characteristics are degraded or cracks are not generated, so that it is possible to provide an LC-integrated multilayer electronic component whose reliability is maintained for a long period of time.

The operation of the multilayer electronic component according to claim 2 will be described below. The present invention has the same configuration as that of the first aspect and operates in the same manner.
It has a configuration of being in the range of 00 μm. That is,
The non-magnetic material forming the intermediate layer is used for preventing the segregation of NiO and reducing the stress due to the difference in thermal expansion coefficient.
It is desirable to have a thickness in the range of 0 to 100 μm.

The operation of the multilayer electronic component according to claim 3 will be described below. The present invention has the same configuration as that of the first and second aspects and operates in the same manner, but further has a configuration in which at least one of the inductor portion and the capacitor portion is formed in a plurality of layers. That is, when two or more magnetic materials are integrated or two or more dielectric materials are integrated, there is no risk of NiO segregation since the materials are of the same type. For this reason, it is possible to freely laminate the non-magnetic material without arranging it as an intermediate layer, and it is possible to easily produce a more sophisticated laminated electronic component.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The first embodiment in which a laminated electronic component according to the present invention is applied to an LC composite component will be described below with reference to the drawings to clarify the present invention.
1 to 5 show an LC composite component 10 having a three-terminal structure, which is an LC series resonance circuit according to the present embodiment. The upper layer of the LC composite component 10 shown in FIGS.
Inductor part 1 formed by laminating a magnetic material of Ni-Cu-Zn ferrite containing NiO which is nickel oxide
2, and the lower layer of the LC composite component 10 is also Ni
A capacitor portion 14 formed by laminating a dielectric material of a TiO ₂ ceramic containing O, and an intermediate layer 16 made of a nonmagnetic material of Cu—Zn ferrite containing no NiO, Are located. Further, the NiO content of the Ni—Cu—Zn-based ferrite constituting the inductor section 12 and the TiO
The difference with the NiO content of the ₂ series ceramic is 15mol%
Materials are selected as follows.

On the other hand, when manufacturing the inductor section 12,
First, the top of the magnetic layer 20A on which the internal conductor 22 is arranged as shown in FIG. 4A is half covered with the magnetic layer 20B as shown in FIG. Is disposed. Further, the magnetic layer 20C
After covering the other half as shown in FIG. 4 (D), the inner conductor 22 is arranged as shown in FIG. 4 (E) to complete the loop of the inner conductor 22. Finally, Is covered with a magnetic layer (not shown), whereby the manufacture of the inductor section 12 is completed. However, actually, the inner conductor 22
Is repeated to form an internal structure in which the internal conductor 22 is formed in a spiral shape.

On the other hand, when manufacturing the capacitor section 14,
First, as shown in FIG. 5A, on the dielectric layer 24A on which the internal electrode 26A extending to the upper right end is disposed,
A dielectric layer 24B on which an internal electrode 26B having a lead portion 27 as shown in FIG. Further, a dielectric layer 24C on which an internal electrode 26C extending to the upper right end as shown in FIG. 5 (C) is disposed, and a dielectric layer (not shown) is formed on the dielectric layer 24C. The manufacture of the capacitor unit 14 is completed.

The terminal electrode 32 shown in FIGS.
The upper end of the inner conductor 22 is connected to the terminal electrode 3.
4 is connected to the lower end of the internal conductor 22 and the internal electrode 26B, and the terminal electrode 36 is connected to the internal electrodes 26A and 26A.
C is connected. As described above, in the present embodiment, one end of the inductor portion 12 and one end of the capacitor portion 14 are connected to the two terminal electrodes 32 and 36 disposed on the left and right sides of the LC composite component 10 shown in FIGS. The structure is such that the inductor portion 12 and the capacitor portion 14 are connected via the terminal electrode 34 located at the center of the side surface 10A of the side surface 10A, and becomes a wiring like an equivalent circuit shown in FIG.

Next, the LC composite component 1 according to the present embodiment
The operation of 0 will be described. The LC composite component 10 according to the present embodiment includes an inductor portion 12 in which a magnetic material made of Ni-Cu-Zn-based ferrite containing NiO is laminated, and a capacitor portion 14 in which a dielectric material made of TiO ₂ -based ceramic containing NiO is laminated. Are integrated, and an intermediate layer 16 made of a nonmagnetic material of Cu—Zn-based ferrite is arranged between the inductor portion 12 and the capacitor portion 14. The difference between the NiO content of the magnetic material forming the inductor portion 12 and the NiO content of the dielectric material forming the capacitor portion 14 is set to 15 mol% or less.

As described above, since the intermediate layer 16 containing no NiO is disposed between the inductor section 12 and the capacitor section 14, NiO diffused from the inductor section 12 and the capacitor section 14 is reduced by the intermediate layer 16. Absorbed and relaxed,
NiO does not segregate in the inductor section 12 and the capacitor section 14. As a result, there is no possibility that the insulation resistance is reduced and the characteristics are degraded or a crack is not generated, and the reliability of the LC integrated component 10 of the LC integrated type can be maintained for a long time.

That is, when there is no intermediate layer 16 made of a nonmagnetic material of Cu-Zn ferrite between the inductor portion 12 and the capacitor portion 14 and the two are to be directly joined, the inductor portion 12 and the capacitor portion 14 NiO, which is a composition of each other, is segregated at a boundary between the layers, and the insulation resistance at the boundary decreases. Then, as shown in FIGS. 1 and 2, the side surface 1 of the LC composite component 10 where this boundary portion is located
Since three terminal electrodes 32, 34, and 36 are arranged at 0A, as the insulation at the boundary decreases, FIG.
The insulation resistance of the capacitor portion 14 of the equivalent circuit of
The function of the LC composite component 10 will be reduced. However, if the intermediate layer 16 is present as in the present embodiment, the insulation at the boundary does not decrease and the LC composite component 10
Function can be maintained for a long time.

On the other hand, in the present embodiment, the thickness range of the intermediate layer 16 is set to 10 to 100 μm. That is,
The intermediate layer 16 made of a non-magnetic material of Cu-Zn based ferrite is an unnecessary layer in terms of circuit characteristics and it is basically desired that the intermediate layer 16 be thinner. 10 to reduce stress
It is desirable that the thickness be in the range of １００100 μm. On the other hand, as a method of laminating the LC composite component 10, a method using a sheet in addition to printing can be considered. However, since a thin sheet is difficult to handle, it is preferable that the thickness is 10 μm or more from the viewpoint of ease of production. If the thickness is too large, the thickness of the LC composite component 10 becomes unnecessarily large, so that the thickness is desirably 100 μm or less.

Furthermore, even if the intermediate layer 16 is
If there is a large difference in the content of NiO, the diffusion proceeds from the one with the higher content to the one with the lower content, and there is a risk that the compositions of the two may be changed near the boundary. The difference in the content was 15 mol% or less.
Accordingly, the inductor section 12 and the capacitor section 14
Are considered to contain substantially the same amount of NiO, so that the influence of the diffusion of NiO on each other can be reduced, and segregation can be prevented more reliably.

Specifically, the difference in NiO content between the magnetic substance made of ferrite and the dielectric substance made of ceramic is 1
When the NiO content of the magnetic material is higher than 5 mol%, NiO diffuses from the inductor portion 12 to the capacitor portion 14 near the boundary. For this reason, the ratio of NiO in the inductor portion 12 near these boundaries decreases, and in the inductor portion 12,
A portion of the magnetic material with a small amount of NiO is present.

In the case of Ni-Cu-Zn ferrite, the thermal expansion coefficient increases as the amount of NiO increases, and decreases as the amount of NiO decreases. That is, a layer having a different thermal expansion coefficient is formed in the inductor portion 12 due to the difference in the amount of NiO. Even if the inductor portion 12 and the capacitor portion 14 have the same thermal expansion coefficient, the layer near the center boundary of the LC composite component 10 Thus, layers having different coefficients of thermal expansion are formed. The layers having different coefficients of thermal expansion make the LC composite component 1
Along with the application of the largest stress near the center of 0, there is a possibility that cracks may occur near the center.

On the other hand, when the difference between the NiO content of the magnetic material and the dielectric material exceeds 15 mol% and the NiO content of the magnetic material is low, conversely, NiO diffuses into the inductor section 12. As a result, the NiO ratio of the inductor portion 12 near these boundaries increases, and although the magnitude of the thermal expansion coefficient is reversed, the same phenomenon as described above may occur and cracks may occur. The inductor section 12 and the capacitor section 1
The above phenomenon is also concerned with the intermediate layer 16 made of a nonmagnetic material of Cu-Zn ferrite disposed between the intermediate layer 4 and the intermediate layer 4. However, since the intermediate layer 16 is an unnecessary layer in terms of circuit characteristics, it is as thin as possible. There is no particular problem for designing.

Next, a second embodiment according to the present invention will be described with reference to FIG. The same members as those described in the first embodiment are denoted by the same reference numerals, and redundant description will be omitted. The LC composite component 10 according to the present embodiment illustrated in FIG. 6 includes an intermediate layer 16 made of a nonmagnetic material of Cu—Zn-based ferrite between the inductor unit 12 and the capacitor unit 14, similarly to the first embodiment. The difference in the NiO content between the inductor portion 12 and the capacitor portion 14 is set within 15 mol%.

Further, in the present embodiment, the first inductor portion 12A and the second inductor portion 12B, which are two layers of magnetic material, are continuously integrated to form the inductor portion 12. The NiO content of the magnetic material constituting the first inductor portion 12A and the second inductor portion 1
The difference from the NiO content of the magnetic material constituting 2B is, for example, 15 mol% or less.

That is, when the two inductor portions 12A and 12B are integrated as in the present embodiment, since the materials of the same system are integrated, there is no possibility that NiO will segregate between them. . Therefore, a magnetic material can be freely laminated without disposing a nonmagnetic material of Cu—Zn-based ferrite therebetween, and a more sophisticated LC composite component 10 can be easily manufactured.

Next, the basis for setting the difference in the NiO content to 15 mol% or less will be described based on data. 1 mm thick TiO ₂ ceramic and 1 mm thick Ni-Cu-Zn
Five types of samples are produced by laminating a 50-μm Cu-Zn-based ferrite in between, cutting this laminated product into a size of 2 mm square and firing at a temperature of about 900 ° C. did. That is, as shown in Table 1, the compositions of the TiO ₂ -based ceramic and the Cu-Zn-based ferrite were constant, and the Ni-Cu-Zn-based ferrites had different NiO contents. 1 to NO. Five kinds of samples up to 5 were produced. Then, the number of cracks generated was confirmed by observing the internal state of each of the 30 samples after firing, and the results were shown in comparison with Table 1 below.

[0026]

[Table 1]

In Table 1 above, NO. N as in sample 3
If the iO content is 20 mol%, 5 mol% of Ni
The difference in the NiO content from the TiO ₂ -based ceramic, which is regarded as the O content, was 15 mol%. In the sample No. 3, the occurrence of cracks was 0%. In contrast, N
The NO. in which the difference in iO content is 18 mol%. In sample No. 4, 20% of cracks occurred. From the above, NiO
It is presumed that cracks occur when the difference in content exceeds 15 mol%, and it can be understood that the difference in NiO content should be 15 mol% or less.

In the second embodiment, the inductor section 12 is formed of the first inductor section 12A made of two layers of magnetic material.
Although the structure including the second inductor portion 12B is used, three or more layers may be used, and the capacitor portion 14 may be constituted by a plurality of capacitor portions. on the other hand,
In the above embodiment, the inductor portion 12 is made of Ni-Cu-
It is formed by laminating magnetic materials of Zn-based ferrite,
The capacitor portion 14 is formed by laminating a dielectric material of TiO ₂ -based ceramic, and the intermediate layer 16 is made of a non-magnetic material of Cu-Zn-based ferrite. It may be what was.
On the other hand, a magnetic substance or a dielectric substance used in the above-described embodiment employs a substance obtained by binding powder and firing with a binder, and the internal conductor and the internal electrode are formed by kneading silver powder with a binder, for example. A conductive paste can be used, but other materials may be used.

[0029]

According to the multilayer electronic component of the present invention, an excellent effect that the reliability is further improved can be obtained.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an LC composite component according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view illustrating the LC composite component according to the first embodiment of the present invention.

FIG. 3 is a circuit diagram of the LC composite component according to the first embodiment of the present invention.

FIGS. 4A and 4B are perspective views illustrating the production of the LC composite component according to the first embodiment of the present invention, wherein FIG. 4A is a diagram showing a first stage of production of an inductor portion, and FIG. It is a figure which shows the state which covered the half by the magnetic material layer, (C) is a figure which shows the state which arrange | positioned the internal conductor, and (D) is a figure which shows the state which covered the other half by the magnetic material layer. (E) is a diagram showing a state in which an internal conductor is further arranged.

FIGS. 5A and 5B are perspective views illustrating the production of the LC composite component according to the first embodiment of the present invention, wherein FIG. 5A is a diagram showing a first stage of production of the capacitor unit, and FIG. It is a diagram showing a state in which a dielectric layer on which internal electrodes are arranged is stacked,
(C) is a diagram showing a state in which another dielectric layer on which internal electrodes are arranged is stacked.

FIG. 6 is a sectional view showing an LC composite component according to a second embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 10 LC composite part 12 Inductor part 14 Capacitor part 16 Intermediate layer

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5E001 AB03 AE03 AH01 AJ02 5E070 AA05 AB01 BA12 CB03 CB13 CB17 5E082 AA01 AB03 BB02 BC33 DD08 EE04 EE11 EE23 EE35 FF05 FG06 FG26 FG46 FG54 GG10 GG01 GG10

Claims (3)

[Claims] 1. An inductor portion using a magnetic material containing NiO and a capacitor portion using a dielectric material containing NiO,
An integrated laminated electronic component, wherein an intermediate layer made of a non-magnetic material is disposed in a portion between the inductor portion and the capacitor portion, and a difference between the NiO content of the magnetic material and the NiO content of the dielectric is reduced by 15 mol. % Or less. 2. The multilayer electronic component according to claim 1, wherein the thickness of the intermediate layer is in the range of 10 to 100 μm. 3. The multilayer electronic component according to claim 1, wherein at least one of the inductor section and the capacitor section is formed in a plurality of layers.