JP2000311830A - Layered capacitor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a layered capacitor which realizes small capacitance, without reducing the number of inner electrodes and does not cause increase in equivalent series resistance. SOLUTION: First and second inner electrodes 3, 4, formed along a first interface 12 between a plurality of dielectric layers 2 provided to a capacitor body 7 and third and fourth inner electrodes 5, 6, are formed along a second interface 13. Fine tip parts 14, to 17 are formed in the first to fourth inner electrodes 3 to 6, respectively, and electrostatic capacity is formed by counterposing of the fine tip parts 14 to 17.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multilayer capacitor, and more particularly to a multilayer capacitor having a structure suitable for providing a relatively small capacitance.

[0002]

2. Description of the Related Art Generally, a multilayer capacitor such as a multilayer ceramic capacitor has an advantage that a large capacitance can be obtained while being small, but a capacitor for providing a relatively small capacitance is also required. In some cases, a multilayer capacitor is applied. Even in such a low-capacitance multilayer capacitor, in order to be able to apply the same handling technology as that of the high-capacity multilayer capacitor, it is made to have substantially the same outer dimensions as the high-capacity multilayer capacitor. Preferably.

[0003] In a multilayer capacitor, various methods can be considered to reduce the obtained capacitance. Typically, the number of internal electrodes is reduced, and the internal area is reduced so as to reduce the facing area of the internal electrodes. It is conceivable to reduce the width dimension or the longitudinal dimension of the electrode, or to increase the thickness of the dielectric layer between the internal electrodes.

[0004]

However, the above-mentioned methods for reducing the obtained capacitance in the multilayer capacitor have the following problems.

First, when the number of internal electrodes is reduced, the acquired capacitance is greatly increased even when defects such as disconnection of the internal electrodes themselves and poor connection with the external electrodes occur only in one internal electrode. In other words, the rate of change or the rate of change of the acquired capacitance increases. For example, when a configuration having only two internal electrodes is adopted, the acquired capacitance becomes substantially zero simply because a defect occurs in only one internal electrode. For this reason, when designing a low-capacitance multilayer capacitor, it is not always appropriate to adopt a method of reducing the number of internal electrodes.

Next, in order to reduce the opposing area of the pair of internal electrodes, the width dimension of each internal electrode is reduced.
The electrical resistance of the internal electrodes increases, causing an increase in the equivalent series resistance of the multilayer capacitor. In addition, in the overlapping state of the plurality of internal electrodes, when a displacement in the width direction occurs between the pair of internal electrodes, the acquired capacitance fluctuates. The fluctuation rate increases.

Next, in order to reduce the facing area of the internal electrodes while reducing the width of the internal electrodes in the width direction as described above, the pair of internal electrodes in the longitudinal direction are reduced. When the overlap is reduced, the fluctuation rate of the acquired capacitance when the positional displacement in the longitudinal direction occurs between the internal electrodes in the overlapping state of the plurality of internal electrodes increases.

Next, when the thickness of the dielectric layer between the internal electrodes facing each other is increased, the dimension of the multilayer capacitor in the thickness direction is simply increased. Due to a problem, the dimension in the thickness direction of the multilayer capacitor cannot often be increased with an increase in the thickness of the dielectric layer. Therefore, the number of internal electrodes must be reduced, but in this case, a problem similar to that encountered when the number of internal electrodes is reduced is encountered.

An object of the present invention is to solve the above-described problems encountered when designing a low-capacitance multilayer capacitor.

[0010]

SUMMARY OF THE INVENTION The present invention provides a capacitor body including a plurality of stacked dielectric layers and a plurality of internal electrodes formed along a plurality of interfaces between the plurality of dielectric layers, respectively. The present invention is directed to a multilayer capacitor including first and second external electrodes formed on opposing first and second end surfaces of a capacitor body, and solves the above-mentioned technical problem. Therefore, it is characterized by having the following configuration.

That is, in the multilayer capacitor according to the present invention, the internal electrodes are formed along the first interfaces between the dielectric layers, and are electrically connected to the first external electrodes. And a second internal electrode electrically connected to the second external electrode, and a second internal electrode electrically connected to the first external electrode while being formed along the second interface between the dielectric layers. A third internal electrode and a fourth internal electrode electrically connected to the second external electrode.

Each of the first to fourth internal electrodes has a narrow end portion, and the first internal electrode is formed in a direction orthogonal to a direction connecting the first and second end faces of the capacitor body. The narrow tip of the electrode and the narrow tip of the second internal electrode are adjacent to each other, and the narrow tip of the third internal electrode and the narrow tip of the fourth internal electrode are adjacent to each other. To be.

The narrow tip of the first internal electrode and the narrow tip of the fourth internal electrode face each other via a dielectric layer between the first and second interfaces, and The narrow tip of the second internal electrode and the narrow tip of the third internal electrode are opposed to each other.

In the multilayer capacitor according to the present invention,
A displacement in the direction connecting the first and second end faces of the capacitor body occurs between the first and second internal electrodes and the third and fourth internal electrodes. Although the area where the narrow end portion and the narrow end portion of the fourth internal electrode face each other may increase or decrease,
When the facing area between the first internal electrode and the fourth internal electrode increases or decreases in this way, the narrow distal end of the second internal electrode and the narrow distal end of the third internal electrode respectively become Preferably, the areas facing each other are reduced or increased.

In the preferred embodiment described above, the first
And even if there is a displacement between the second internal electrode and the third and fourth internal electrodes in the direction connecting the first and second end faces of the capacitor body, the narrow width of the first internal electrode The sum of the area where the tip and the narrow tip of the fourth internal electrode face each other, and the area where the narrow tip of the second internal electrode and the narrow tip of the third internal electrode face each other Is more preferably set to be substantially constant.

The more preferred embodiment described above can be realized, for example, as follows. That is, the first
Each of the narrow end portions of the fourth to fourth internal electrodes extends with a certain dimension in the width direction. Then, the width direction dimension of the region where the narrow end portion of the first internal electrode and the narrow end portion of the fourth internal electrode face each other, the narrow end portion of the second internal electrode, and the third internal electrode The widthwise dimensions of the region where the narrow width end portions oppose each other are made substantially equal to each other.

In the present invention, preferably, the direction connecting the first and second end faces of the capacitor body between the first and second internal electrodes and the third and fourth internal electrodes is orthogonal to the present invention. Even if the position shifts in the direction in which the narrow inner end of the first internal electrode and the narrow inner end of the fourth internal electrode are opposed to each other and the narrow inner end of the second internal electrode, The areas where the narrow inner ends of the third internal electrodes face each other are each kept substantially constant.

The preferred embodiment described above, for example,
It can be realized as follows. That is, one of the narrow tip portions of the first and fourth internal electrodes has a larger width dimension than the other, and one of the narrow tip portions of the second and third internal electrodes has a smaller width than the other. It is configured to have a large width dimension.

Further, the above-described preferred embodiment of the present invention, that is, the first and fourth internal electrodes are displaced in the direction connecting the first and second end faces, whereby the first and fourth internal electrodes are displaced. When the facing area of each narrow end of the fourth internal electrode increases or decreases,
The embodiment in which the facing area of each narrow end of the second and third internal electrodes is reduced or increased can also be realized as follows.

That is, the boundary region between the narrow end portions of the first and second internal electrodes is located at an intermediate position between the direction connecting the first and second end faces of the capacitor body and the direction orthogonal thereto. Direction, and the boundary area between each narrow tip of the third and fourth internal electrodes is defined by a first region of the capacitor body.
With respect to a center line connecting between the first and second inner surfaces, the first and second inner electrodes extend in a direction symmetric to a direction in which a boundary region between the narrow end portions extends.

[0021]

1 and 2 show a multilayer capacitor 1 according to a first embodiment of the present invention.

The multilayer capacitor 1 includes a capacitor body 7 including a plurality of stacked dielectric layers 2 and a plurality of internal electrodes 3 to 6 formed along a plurality of interfaces between the dielectric layers 2, respectively. The first opposing capacitor body 7
And formed on the second end faces 8 and 9, respectively.
First and second external electrodes 10 and 11 are provided.

FIG. 1 shows the internal structure of a multilayer capacitor 1, in which (a) shows a first interface 1 between dielectric layers 2.
2 shows a cross section along (b), and shows a cross section along a second interface 13 different from the first interface 12. FIG.
FIG. 2 is a sectional view taken along line II-II in FIG. 1.

The internal electrodes 3 to 6 are classified into four types as described below.

The first internal electrode 3 is provided between the first dielectric layer 2 and the first internal electrode 3.
Are formed along the interface 12 and electrically connected to the first external electrode 10.

The second internal electrode 4 is electrically connected to the second external electrode 11 while being formed along the first interface 12 between the dielectric layers 2 similarly to the first internal electrode 3. Is done.

The third internal electrode 5 is provided between the dielectric layer 2 and the second internal electrode 5.
While being formed along the interface 13 of the first electrode, they are electrically connected to the first external electrode 10.

The fourth internal electrode 6 is electrically connected to the second external electrode 11 while being formed along the second interface 13 between the dielectric layers 2 similarly to the third internal electrode 5. Is done.

The first to fourth internal electrodes 3 to 6
Have narrow end portions 14 to 17, respectively.

Then, the narrow end portion 1 of the first internal electrode 3
4 and the narrow end portion 15 of the second internal electrode 4 have a direction (width) orthogonal to a direction (longitudinal direction in this embodiment) connecting the first and second end surfaces 8 and 9 of the capacitor body 7. Direction). Also,
Narrow tip 16 of third internal electrode 5 and fourth internal electrode 6
Are also located adjacent to each other in the width direction.

Also, the first and second interfaces 12 and 1
The narrow end portion 14 of the first internal electrode 3 and the narrow end portion 17 of the fourth internal electrode 6 face each other via the dielectric layer 2 between the third internal electrode 3 and the second internal electrode 4. Of the third internal electrode 5 are opposed to each other. Then, as shown in FIG. 2, the alternate stacking of the first and second internal electrodes 3 and 4 and the third and fourth internal electrodes 5 and 6 is repeated a plurality of times.

The capacitance provided by the multilayer capacitor 1 is formed by the opposition of the first to fourth internal electrodes 3 to 6 as described above. Such opposition has a relatively small width dimension. As provided by the narrow tips 14-17, the acquired capacitance can be reduced without resorting to a method of reducing the number of internal electrodes.

Since two internal electrodes 3 and 4 or 5 and 6 are formed along one interface 12 or 13, the number of internal electrodes 3 to 6 can be reduced without significantly reducing the number of internal electrodes 3 to 6. The thickness can be increased, and the number of stacked dielectric layers 2 can be reduced. Therefore, the capacitance can be reduced by increasing the thickness of the dielectric layer 2 as described above, and the production efficiency of the multilayer capacitor 1 can be improved by reducing the number of stacked dielectric layers 2. Can be.

As described above, it is not necessary to rely on means for reducing the number of internal electrodes 3 to 6 in reducing the acquired capacitance, and the number of internal electrodes 3 to 6 does not decrease so much. Regarding the electrode, even if a defect such as disconnection of the electrode itself or connection failure with the external electrode 10 or 11 occurs, the variation rate of the acquired capacitance can be suppressed to a small value.

The internal electrodes 3 to 6 are connected to the narrow end portions 14.
Since the width of each of the electrodes can be made relatively large except for the cases of Nos. 1 to 17, not only the cutting of the internal electrodes 3 to 6 and the poor connection with the external electrodes 10 or 11 are hardly caused, but also
The electrical resistance of the internal electrodes 3 to 6 can be reduced, and therefore, the equivalent series resistance of the multilayer capacitor 1 can be reduced.

Further, in the multilayer capacitor 1 according to this embodiment, there is no longitudinal displacement between the first and second internal electrodes 3 and 4 and the third and fourth internal electrodes 5 and 6. Even if it occurs, measures are taken so that the acquired capacitance does not substantially fluctuate.

That is, due to such a displacement in the longitudinal direction, the area where the narrow end portion 14 of the first internal electrode 3 and the narrow end portion 17 of the fourth internal electrode 6 face each other is reduced. When increasing or decreasing, respectively, the second
The area where the narrow end portion 15 of the internal electrode 4 and the narrow end portion 16 of the third internal electrode 5 face each other is reduced or increased.

More specifically, even if the above-described displacement in the longitudinal direction occurs, the narrow end portion 14 of the first internal electrode 3 and the narrow end portion 17 of the fourth internal electrode 6 are not moved. Are the area facing each other, the narrow end portion 15 of the second internal electrode 4 and the third
Of the internal electrode 5 and the area where the narrow end portion 16 of the internal electrode 5 opposes each other is substantially constant.

More specifically, each of the narrow end portions 14 to 17 of the first to fourth internal electrodes 3 to 6 is
As shown in FIGS. 1 (a) and 1 (b), each of the narrow width end portions 14 to 17 is set to be substantially equal to each other. Have been. Therefore, the first and second
Of the first and second internal electrodes 3 and 4 and the third and fourth internal electrodes 5 and 6 in the longitudinal direction. When the area of the electrode 6 facing the narrow tip 17 increases, the area of the facing of the narrow tip 15 of the second internal electrode 4 and the narrow tip 16 of the third internal electrode 5 decreases. Compensatingly reduced so that the sum of these opposing areas remains substantially constant and does not result in a substantial variation in the acquired capacitance.

Each pattern of the internal electrodes 3 to 6 in the first embodiment described above is merely an example, and the patterns of these internal electrodes are as described below with reference to FIGS. 3 to 6, respectively. Various changes can be made.

FIGS. 3 to 6 show multilayer capacitors 21 to 21 according to second to fifth embodiments of the present invention, respectively.
FIG. 2 is a diagram corresponding to FIG. These multilayer capacitors 21 to 24 basically differ from the multilayer capacitor 1 shown in FIG. 1 only in the pattern of the internal electrodes. Therefore, in FIGS. 3 to 6, unique reference numerals are used only for the internal electrodes,
For other elements, the same reference numerals as those used in the corresponding elements shown in FIG.

In the multilayer capacitor 21 shown in FIG. 3, an internal electrode is formed along the first interface 12 between the dielectric layers 2 and is electrically connected to the first external electrode 10. 1 internal electrode 25 and 2nd external electrode 1
The second internal electrode 26 electrically connected to the first electrode 1 and the second internal electrode 26 electrically connected to the first external electrode 10 while being formed along the second interface 13 between the dielectric layers 2. The third internal electrode 27 and the fourth internal electrode 28 electrically connected to the second external electrode 11 are provided.

The first internal electrode 25 has two narrow end portions 29 and 30 extending in parallel with each other. Second
The internal electrode 26 has a narrow tip 31 located between the narrow tips 29 and 30 described above. The third internal electrode 27 has a narrow end portion 32. The fourth inner electrode 28 includes two narrow end portions 33 and 34 extending so as to sandwich the narrow end portion 32 described above and extending in parallel with each other.
have.

Each of the narrow end portions 29 to 34 extends with a constant width dimension, and the narrow end portions 29, 30, 33, and 34 have the same width direction size as each other, and , The narrow width end portions 31 and 32 have the same width dimension as each other. Moreover, in this embodiment, the width-direction dimensions of the narrow tip portions 29, 30, 33, and 34 are set to half the width-direction dimensions of the narrow width tip portions 31 and 32, respectively.

By adopting the above configuration,
Even if the longitudinal displacement between the first and second internal electrodes 25 and 26 and the third and fourth internal electrodes 27 and 28 occurs, the narrow tip 2
9 and 30 and the narrow end portions 33 and 34 of the fourth internal electrode 28 oppose each other, respectively, and the narrow end portion 31 of the second internal electrode 26 and the narrow end of the third internal electrode 27. The sum of the areas where the portions 32 face each other can be substantially constant.

Thus, according to this embodiment, the first and second internal electrodes 25 and 26 and the third
Even if a positional displacement in the longitudinal direction occurs between the second internal electrodes 27 and 28 and the fourth internal electrodes 27 and 28, it is possible to prevent the acquired capacitance from substantially fluctuating.

In FIG. 3, the narrow end portions 29 and 30 are set to have the same width direction dimensions as each other, and
While 3 and 34 are set to the same width dimension,
Each width direction dimension of the narrow end portions 29, 30, 33, and 34 is set to half of each width direction size of the narrow end portions 31 and 32, but is not limited thereto. Are set to different width-direction dimensions from each other, and accordingly, the narrow width tip parts 33 and 34 are also set to mutually different width-direction dimensions. The total width dimension of the width tips 33 and 34 may be set to be equal to each width dimension of the narrow tips 31 and 32. This also substantially reduces the change in capacitance when the first and second internal electrodes 25 and 26 and the third and fourth internal electrodes 27 and 28 are displaced in the longitudinal direction. Can be eliminated.

In the multilayer capacitor 22 shown in FIG. 4, an internal electrode is formed along the first interface 12 between the dielectric layers 2 and is electrically connected to the first external electrode 10. A second internal electrode 36 electrically connected to the first internal electrode 35 and the second external electrode 11,
And a third internal electrode 37 and a second external electrode 11 that are formed along the second interface 13 between the dielectric layers 2 and are electrically connected to the first external electrode 10.
And a fourth internal electrode 38 electrically connected to the second internal electrode 38.

The first to fourth internal electrodes 35 to 38 are
Each has a narrow tip portion 39-42. Each of the narrow end portions 39 to 42 extends with a certain width dimension.

In this embodiment, the narrow end portion 39 of the first internal electrode 35 is connected to the narrow end portion 4 of the fourth internal electrode 38.
The narrow tip 41 of the third internal electrode 37 has a width dimension larger than the narrow tip 40 of the second internal electrode 36.

Therefore, the first and second internal electrodes 3
5 and 36 and third and fourth internal electrodes 37 and 3
8, the area in which the narrow end portion 39 of the first internal electrode 35 and the narrow end portion 42 of the fourth internal electrode 38 face each other substantially. And the narrow end portion 40 of the second internal electrode 36.
The area where the and the narrow tip 41 of the third internal electrode 37 face each other can be kept substantially constant. Accordingly, even if the first and second internal electrodes 35 and 36 and the third and fourth internal electrodes 37 and 38 are displaced in the width direction, the fluctuation of the acquired capacitance is substantially reduced. Can be prevented.

In this embodiment, the width dimension of the narrow end portion 40 of the second internal electrode 36 and the fourth internal electrode 3
8 are set substantially equal to each other in the width direction, so that the width direction dimensions of the region where the narrow ends 39 and 42 face each other and the narrow end 4
The width dimension of the region where 0 and 41 face each other is
They are made to be substantially equal to each other.

Therefore, even if the first and second internal electrodes 35 and 36 and the third and fourth internal electrodes 37 and 38 are displaced in the longitudinal direction, the narrow width end portions 39 are formed. And 42 can be substantially constant. The sum of the area where the narrow ends 40 and 41 face each other can be substantially constant.

Therefore, according to this embodiment, the first and second internal electrodes 35 and 36 and the third and fourth internal electrodes 37 and 38 can be connected in any of the width direction and the longitudinal direction. , The fluctuation of the acquired capacitance can be substantially prevented from occurring.

In the multilayer capacitor 23 shown in FIG. 5, an internal electrode is formed along the first interface 12 between the dielectric layers 2 and is electrically connected to the first external electrode 10. A second internal electrode 44 electrically connected to the first internal electrode 43 and the second external electrode 11,
And a third internal electrode 45 and a second external electrode 11 that are formed along the second interface 13 between the dielectric layers 2 and are electrically connected to the first external electrode 10.
And a fourth inner electrode 46 electrically connected to the second electrode.

The first to fourth internal electrodes 43 to 4
6 have narrow end portions 47 to 50, respectively.

In this embodiment, the narrow end 47 of the first internal electrode 43 and the narrow end 48 of the second internal electrode 44 are used.
Is extended in a direction intermediate between the longitudinal direction and the width direction. Also, the boundary region 52 between the narrow tip portion 49 of the third internal electrode 45 and the narrow tip portion 50 of the fourth internal electrode 46 is the same as that described above with respect to the center line 53 extending in the longitudinal direction of the capacitor body 7. It extends in a direction symmetric to the direction in which the boundary region 51 extends.

Also in this embodiment, the first and second
Of the first and second internal electrodes 43 and 44 and the third and fourth internal electrodes 45 and 46 in the longitudinal direction. When the area of the narrow end portion 50 of the electrode 46 facing each other increases or decreases, the narrow end portion 48 of the second internal electrode 44 and the narrow end portion 49 of the third internal electrode 45 respectively become The areas facing each other decrease or increase. Further, the compensation action such that when the facing area of one increases, the facing area of the other decreases, or when the facing area of one decreases, the facing area of the other increases. 2 internal electrodes 43 and 4
The fourth embodiment operates even when a displacement occurs in the width direction between the fourth and third and fourth internal electrodes 45 and 46.

Therefore, according to this embodiment, the first
And second internal electrodes 43 and 44 and third and fourth electrodes 43 and 44.
Even if a displacement occurs in any of the longitudinal direction and the width direction between the internal electrodes 45 and 46, the fluctuation of the acquired capacitance can be suppressed to be small.

The multilayer capacitor 24 shown in FIG.
Is similar to the multilayer capacitor 23 shown in FIG. That is, the multilayer capacitor 24 includes the first to fourth internal electrodes 54 to 57, and the first to fourth internal electrodes 5 to 57.
4 to 57 have narrow end portions 58 to 61, respectively.
The boundary region 62 between the narrow end portions 58 and 59 of each of the first and second internal electrodes 54 and 55 extends in a direction intermediate between the longitudinal direction and the width direction of the capacitor main body 7, and And a boundary region 63 between the narrow tips 60 and 61 of each of the fourth internal electrodes 56 and 57 extends in a direction symmetric to the direction in which the boundary region 62 extends with respect to the longitudinally extending center line 64. ing.

This embodiment differs from the multilayer capacitor 23 shown in FIG. 5 in that each of the internal electrodes 54 to 57 has a tapered pattern as a whole.

6, the first and second internal electrodes 54 and 55 and the third and fourth internal electrodes 56 and 57 are also provided by the multilayer capacitor 24 shown in FIG. Therefore, even if a displacement occurs in any of the longitudinal direction and the width direction, the fluctuation of the acquired capacitance can be suppressed to a small value.

As described above, the present invention has been described with reference to several illustrated embodiments. For example, the number and pattern of the internal electrodes can be variously changed within the scope of the present invention.

[0064]

As described above, in the multilayer capacitor according to the present invention, since two internal electrodes are formed along one interface between a plurality of dielectric layers provided in the capacitor body, each dielectric layer is formed. Although the thickness of the dielectric layer is increased and the number of stacked dielectric layers is reduced, the number of internal electrodes does not decrease so much. Further, in the multilayer capacitor according to the present invention, the capacitance is acquired by opposing the narrow ends of the internal electrodes. From the above, according to the present invention, the following effects can be obtained.

First, since the number of internal electrodes does not decrease so much, even if a defect such as disconnection or poor connection with an external electrode occurs in a specific internal electrode, the variation rate of the acquired capacitance of the entire multilayer capacitor is low. Can be suppressed.

Also, while reducing the number of stacked dielectric layers,
Since the thickness of each dielectric layer can be increased, and the capacitance is obtained by opposing the narrow ends of the internal electrodes, a low-capacitance multilayer capacitor can be easily obtained, and It is easy to make the external dimensions of the low-capacitance multilayer capacitor substantially the same as those of a general high-capacity multilayer capacitor.

Further, since the width dimension of the other portion of the internal electrode except for the narrow end portion can be made relatively large, it is more difficult to cut the internal electrode and to cause poor connection with the external electrode. In addition to this, the electrical resistance of the internal electrode can be reduced, and the equivalent series resistance can be reduced accordingly.

Further, since the number of stacked dielectric layers can be reduced while increasing the thickness of the dielectric layers, the handling and stacking process of the dielectric layers in manufacturing a multilayer capacitor can be efficiently performed. . Moreover, regarding the internal electrode printing process, two internal electrodes formed along one interface between the dielectric layers can be simultaneously printed. From these facts, high production efficiency can be expected in the production of the multilayer capacitor.

In the present invention, the direction connecting the first and second end faces of the capacitor body between the first and second internal electrodes and the third and fourth internal electrodes (typically,
When the narrow end portion of the first internal electrode and the narrow end portion of the fourth internal electrode face each other due to the displacement in the longitudinal direction), when the narrow end portion of the first internal electrode and the narrow end portion of the fourth internal electrode are opposed to each other, the second If the area where the narrow end of the internal electrode and the narrow end of the third internal electrode face each other is reduced or increased, even if such a displacement occurs, the acquired electrostatic Fluctuations in capacity can be kept small.

In addition to the above, displacement between the first and second internal electrodes and the third and fourth internal electrodes in the direction connecting the first and second end faces of the capacitor body is not limited. Even if it occurs, the area where the narrow tip of the first internal electrode and the narrow tip of the fourth internal electrode face each other, the narrow tip of the second internal electrode, and the narrow of the third internal electrode. If the sum of the areas where the width leading ends face each other is made substantially constant, it is possible to substantially eliminate the fluctuation of the acquired capacitance due to such displacement.

The above-mentioned effect is obtained by the fact that each narrow tip of the first to fourth internal electrodes extends with a certain widthwise dimension, and the narrow tip of the first internal electrode is connected to the fourth narrow tip. The width dimension of the region where the narrow tip of the internal electrode faces each other, the width dimension of the region where the narrow tip of the second internal electrode and the narrow tip of the third internal electrode face each other, But,
By being made substantially equal to each other,
It can be easily realized.

In the present invention, the first and second
Even if a displacement occurs in the direction (width direction) orthogonal to the direction connecting the first and second end faces of the capacitor body between the internal electrode and the third and fourth internal electrodes, the first The area where the narrow tip of the internal electrode and the narrow tip of the fourth internal electrode face each other, and the narrow tip of the second internal electrode and the narrow tip of the third internal electrode are mutually opposed. When the opposing areas are each kept substantially constant, even if such a displacement in the width direction occurs, the fluctuation of the acquired capacitance can be substantially eliminated. .

The effect described above is obtained because one of the narrow end portions of the first and fourth internal electrodes has a larger width dimension than the other, and the narrow end portions of the second and third internal electrodes have the same size. This can be easily achieved by designing one of the parts to have a larger width dimension than the other.

In the present invention, the boundary region between the narrow end portions of the first and second internal electrodes is defined by a direction connecting the first and second end faces of the capacitor body and a direction orthogonal to the direction. A boundary region extending in the middle direction and between the narrow ends of the third and fourth internal electrodes is formed in a first direction with respect to a center line connecting the first and second end faces of the capacitor body.
The first and second internal electrodes and the third and fourth internal electrodes are configured to extend in a direction symmetric to the direction in which the boundary region between the narrow end portions of the first and second internal electrodes extends. Even if a displacement occurs between the electrode and the electrode, the fluctuation of the acquired capacitance can be suppressed to a small value.

As described above, even if a displacement occurs between the first and second internal electrodes and the third and fourth internal electrodes, the fluctuation of the acquired capacitance is substantially eliminated, The effect that the size can be reduced can also lead to an increase in the non-defective rate in manufacturing the multilayer capacitor.

[Brief description of the drawings]

FIGS. 1A and 1B show an internal structure of a multilayer capacitor 1 according to a first embodiment of the present invention, in which FIG. 1A is a cross-sectional view taken along a first interface 12 between dielectric layers 2, and FIG. () Is a cross-sectional view shown along the second interface 13.

FIG. 2 is a cross-sectional view taken along line II-II in FIG.

3A and 3B show a multilayer capacitor 21 according to a second embodiment of the present invention, in which FIG. 3A is a cross-sectional view taken along a first interface 12, and FIG. 3B is a sectional view taken along a second interface 13; FIG.

4A and 4B show a multilayer capacitor 22 according to a third embodiment of the present invention, wherein FIG. 4A is a cross-sectional view taken along a first interface 12, and FIG. 4B is a sectional view taken along a second interface 13; FIG.

5A and 5B show a multilayer capacitor 23 according to a fourth embodiment of the present invention, in which FIG. 5A is a cross-sectional view taken along a first interface 12, and FIG. 5B is a sectional view taken along a second interface 13. FIG.

6A and 6B show a multilayer capacitor 24 according to a fifth embodiment of the present invention, wherein FIG. 6A is a cross-sectional view taken along a first interface 12, and FIG. 6B is a sectional view taken along a second interface 13. FIG.

[Explanation of symbols]

1, 21 to 24 Multilayer capacitor 2 Dielectric layer 3, 25, 35, 43, 54 First internal electrode 4, 26, 36, 44, 55 Second internal electrode 5, 27, 37, 45, 56 Third 6, 28, 38, 46, 57 Fourth internal electrode 7 Capacitor body 8 First end face 9 Second end face 10 First external electrode 11 Second external electrode 12 First interface 13 Second Interface of 14-17,29-34,39-42,47-50,5
8-61 Narrow tip 51, 52, 62, 63 Boundary area 53, 64 Center line

Claims (7)

[Claims] 1. A capacitor body including: a plurality of stacked dielectric layers; and a plurality of internal electrodes formed along a plurality of interfaces between the plurality of dielectric layers, respectively. First and second external electrodes formed on first and second end faces, respectively, wherein the internal electrode is formed along a first interface between the dielectric layers, and the first and second external electrodes are formed along the first interface. A first internal electrode electrically connected to the external electrode and a second internal electrode electrically connected to the second external electrode, and a second interface between the dielectric layers. A third internal electrode electrically connected to the first external electrode and a fourth internal electrode electrically connected to the second external electrode, the first to fourth electrodes being formed; The internal electrodes of A narrow tip of the first internal electrode and a width of the second internal electrode in a direction orthogonal to a direction connecting the first and second end faces of the capacitor body. The narrow end portions are adjacent to each other, and the narrow end portions of the third internal electrode and the narrow end portions of the fourth internal electrode are adjacent to each other; the first and second interfaces; Through the dielectric layer between,
The narrow tip of the first internal electrode and the narrow tip of the fourth internal electrode face each other, and the narrow tip of the second internal electrode and the third narrow tip. A multilayer capacitor, wherein the narrow ends of the internal electrodes face each other. 2. A position shift occurs between the first and second internal electrodes and the third and fourth internal electrodes in a direction connecting the first and second end faces of the capacitor body. Thereby, when an area where the narrow end portion of the first internal electrode and the narrow end portion of the fourth internal electrode oppose each other increases or decreases, respectively, 2. The multilayer capacitor according to claim 1, wherein an area where the narrow end portion and the narrow end portion of the third internal electrode face each other decreases or increases. 3. 3. A displacement occurs in a direction connecting the first and second end faces of the capacitor body between the first and second internal electrodes and the third and fourth internal electrodes. Also, the area where the narrow tip of the first internal electrode and the narrow tip of the fourth internal electrode face each other, and the narrow tip of the second internal electrode and the narrow 3. The multilayer capacitor according to claim 2, wherein the sum of the areas of the internal electrodes 3 and the narrow end portions facing each other is substantially constant. 4. 4. The narrow end portion of each of the first to fourth internal electrodes extends with a constant width direction dimension, and the narrow end portion of the first internal electrode and the narrow end portion have the same width. 4, the width dimension of the region where the narrow tip of the internal electrode faces each other, and the narrow tip of the second internal electrode and the narrow tip of the third internal electrode face each other. 4. The multilayer capacitor according to claim 3, wherein the dimensions in the width direction of the region are substantially equal to each other. 5. 5. A direction orthogonal to a direction connecting the first and second end faces of the capacitor body between the first and second internal electrodes and the third and fourth internal electrodes. Area, the narrow end portion of the first internal electrode and the narrow end portion of the fourth internal electrode face each other and the narrow width of the second internal electrode. 5. The device according to claim 1, wherein an area where the distal end portion and the narrow distal end portion of the third internal electrode face each other is kept substantially constant. 6. Multilayer capacitors. 6. One of the narrow end portions of the first and fourth internal electrodes has a larger width dimension than the other.
6. The multilayer capacitor according to claim 5, wherein one of the narrow end portions of the second and third internal electrodes has a larger width dimension than the other. 7. A boundary region between each of the narrow end portions of the first and second internal electrodes is a direction connecting the first and second end faces of the capacitor body and a direction orthogonal to the direction. And the third and fourth
The boundary region between each of the narrow tip portions of the internal electrodes of the first and second internal electrodes is defined by a center line connecting the first and second end faces of the capacitor body. The multilayer capacitor according to claim 2, wherein the multilayer capacitor extends in a direction symmetric to a direction in which the boundary region between the portions extends.