JP2003168620A - Laminated capacitor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide such a laminated capacitor that is applicable for various applications by increasing ESR. <P>SOLUTION: Three kinds of internal conductors 14, 16 and 18 are arranged with a ceramic layer 12A interposed in a dielectric body. A projected part 14A for a first terminal is formed in the internal conductor 14, and two projected parts 15 for first connection are formed. A projected part 16A for a second terminal is formed in the internal conductor 16, and two projected parts 19 for second connection are formed in the internal conductor 18. A terminal electrode connected with the projected part 14A for the first terminal and a terminal electrode connected with the projected part 16A for the second terminal are respectively arranged outside the dielectric body. Two connection electrodes connect the projected part 15 for first connection and the projected part 19 for second connection with each other outside the dielectric body. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multilayer capacitor which can be applied to various purposes by increasing ESR (equivalent series resistance) and suppressing voltage oscillation of a power supply.

[0002]

2. Description of the Related Art Among multilayer capacitors, a multilayer ceramic capacitor has a characteristic that ESR (equivalent series resistance) is smaller than electrolytic capacitors and is excellent in high frequency characteristics. Due to technological advances, thinning and multi-layering of dielectrics have made remarkable progress in recent years. As a result,
Large-capacity monolithic ceramic capacitors, which have a large electrostatic capacity comparable to that of aluminum electrolytic capacitors and tantalum electrolytic capacitors, have begun to appear.

Further, in recent years, the multilayer structure of multilayer ceramic capacitors not only increases the capacitance, but also tends to further lower the ESR. In other words, the ESR at the time of high-frequency fluctuation of the current is dominated by the electric resistance of the internal conductor, so if the density of the internal conductor of the multilayer ceramic capacitor increases due to further multilayering, the ESR will further decrease. become.

Here, FIG. 13 shows the appearance of the multilayer capacitor 100 which is the conventional multilayer ceramic capacitor, the internal structure is shown in FIG. 14, and the equivalent circuit is shown in FIG. The conventional multilayer capacitor 100 will be described below based on these drawings. That is, in this multilayer capacitor 100, the two types of internal conductors 114 and 116 shown in FIG.
The structure is such that they overlap with each other via 12A.

The internal conductor 114 is projected on any one of the four side surfaces of the laminated body 112 formed by laminating a large number of these ceramic layers 112A, and the internal conductor 114 is projected. The internal conductor 116 is projected to the side surface opposite to the side surface. Furthermore, a terminal electrode 118 connected to the internal conductor 114, and
The terminal electrode 120 connected to the inner conductor 116 is shown in FIG.
Are installed on the side surfaces of the multilayer capacitor 100 shown in FIG. Although not shown, a large number of internal conductors 114 and internal conductors 116 are arranged in sequence along the stacking direction of the multilayer body 112.

With such a structure, an equivalent circuit of the conventional multilayer multilayer capacitor 100 is as shown in FIG. That is, the equivalent resistance of the inner conductor 114 itself is R _C1 ~
It is represented by R _Cn , and the equivalent resistance of the inner conductor 116 itself is represented by R _{D1 to} R _Dn, where n represents the number of the respective inner conductors. Then, R _{C1 to} R _Cn and R _D1 to
As can be understood from R _Dn arranged in parallel, the ESR decreases in inverse proportion to the number of stacked layers.

[0007]

On the other hand, large-capacity capacitors are mainly used for smoothing the output of switching power supplies. However, if a capacitor with a small ESR is used,
Although effective in reducing output ripple voltage, ESR
If is too small, the control system of the switching power supply has a drawback that the output voltage becomes unstable or abnormal oscillation occurs. This is because when a capacitor with an excessively small ESR is used, the phase of the feedback circuit of the control circuit is likely to be delayed and the control circuit does not function normally.

Therefore, in applications such as smoothing the output of a switching power supply, the ES is more useful than the multilayer capacitor.
Electrolytic capacitors with a large R were often used. On the other hand, from the viewpoints of cost reduction and miniaturization, it is desired to use a multilayer capacitor even in such applications, but further multilayering of the multilayer capacitor by aiming for even larger capacity in the future Had a possibility that the ESR would be further reduced and the ESR would be too small, as described above. In view of the above facts, the present invention aims to provide a multilayer capacitor which can be applied to various applications by increasing the ESR.

[0009]

A multilayer capacitor according to a first aspect of the present invention can be respectively connected to an external circuit and a dielectric body formed by laminating dielectric layers and arranged outside the dielectric body. At least a pair of terminal electrodes, a first terminal protrusion that is disposed in the dielectric body and protrudes from an end of the dielectric layer and is connected to one of the terminal electrodes, and the first terminal protrusion.
A first inner conductor having a first connecting protrusion protruding from an end of a dielectric layer different from the terminal protrusion, and a first inner conductor arranged in the dielectric body while being separated from the first inner conductor by the dielectric layer. And a second inner conductor having a second terminal projecting portion that projects from the end of the dielectric layer and is connected to the other terminal electrode, the first inner conductor and the second inner conductor, and the dielectric. A third inner conductor which is arranged in the dielectric body while being separated by a layer, and has a second connecting protrusion protruding from an end of the dielectric layer; and a third inner conductor which is arranged outside the dielectric body. And a connecting electrode for connecting between the first connecting protrusion and the second connecting protrusion on the outside of the dielectric body.

In the multilayer capacitor according to the first aspect, the first inner conductor, the second inner conductor and the third inner conductor are mutually dielectric in a dielectric body formed by laminating dielectric layers. The structure is such that they are separated by a body layer. Further, at least a pair of terminal electrodes that can be connected to external circuits are arranged outside the dielectric body. The first inner conductor has a first terminal protrusion protruding from the end of the dielectric layer and connected to one terminal electrode of the pair of terminal electrodes. The second inner conductor has a second terminal projecting portion that projects from the end portion and is connected to the other terminal electrode.

On the other hand, the first inner conductor has a first connecting protrusion protruding at the end of the dielectric layer different from the first terminal protrusion, and the first connecting conductor protrudes at the end of the dielectric layer. Two
The third inner conductor has a connecting protrusion. And
The connection electrodes arranged outside the dielectric body are the first
The connection protrusion and the second connection protrusion are connected outside the dielectric body.

Therefore, the first terminal connected to one of the terminal electrodes
Inner conductor is connected to the third inner conductor through the first connecting protrusion, the connecting electrode, and the second connecting protrusion, and the third inner conductor functions as the same polarity as the first inner conductor. Therefore, the equivalent series resistance of the multilayer capacitor increases as the flow path of the current in the multilayer capacitor becomes longer.

Therefore, even when the output of the switching power supply is smoothed as the equivalent series resistance increases, the electrolytic capacitor is replaced with a multilayer structure to further increase the capacity. It is now possible to use the laminated capacitor. That is, since the ESR of the multilayer capacitor according to the present claim increases, it can be applied to various applications including switching power supplies.

According to the multilayer capacitor of the second aspect,
In addition to the same structure as the multilayer capacitor according to claim 1, it has a structure in which a plurality of first internal conductors are stacked in a dielectric body. Therefore, according to the present claim, not only the ESR is increased, but also the ESR is adjusted to an arbitrary size as the number of stacked first internal conductors is appropriately set. The value of can be controlled.

According to the multilayer capacitor of the third aspect,
In addition to the structure similar to that of the multilayer capacitor according to claim 1 or 2, a plurality of first connecting protrusions and a plurality of second connecting protrusions are respectively provided, and a connecting electrode connecting between these is formed of a dielectric element. It has a configuration in which a plurality of them are arranged outside the body. Therefore, as a result of the plurality of connecting electrodes connecting the first inner conductor and the third inner conductor, the number of contact points increases, and the inner conductors are reliably connected, resulting in poor contact. Etc. are less likely to occur.

According to the multilayer capacitor of the fourth aspect,
In addition to the configuration similar to that of the multilayer capacitor according to the first to third aspects, the first internal conductor has a configuration in which a cut portion is provided. Therefore, by providing the cut portion in the first inner conductor, the flow path of the current is elongated in a bent shape,
The effect of increasing the equivalent series resistance of claim 1 is further increased.

According to the multilayer capacitor of the fifth aspect,
In addition to the structure similar to that of the multilayer capacitor according to any one of claims 1 to 4, the width of the portion of the first inner conductor excluding the first terminal protrusion is formed to be narrower than the width of the first terminal protrusion. It has the following configuration. That is, by maintaining the width of the first terminal projecting portion at a constant size and forming the width of the first inner conductor narrow, the first terminal projecting portion is reliably connected to one of the terminal electrodes. As the current flows through the narrow first inner conductor, the electric resistance of the first inner conductor increases and the effect of increasing the equivalent series resistance further increases.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a multilayer capacitor according to the present invention will be described below with reference to the drawings. First of the present invention
1 to 4 show a monolithic capacitor 10 which is a monolithic ceramic capacitor according to the embodiment. As shown in these figures, the laminated capacitor 1 is mainly composed of a dielectric body 12 which is a rectangular parallelepiped sintered body obtained by firing a laminated body in which a plurality of ceramic green sheets are laminated.
0 is configured.

That is, the dielectric body 12 is formed by laminating dielectric layers which are fired ceramic green sheets. An internal conductor 14, which is a planar first internal conductor, is arranged at a predetermined height position in the dielectric body 12, and a ceramic layer that is a dielectric layer in the dielectric body 12. Below the inner conductor 14 that is separated by 12A, an inner conductor 16 that is a planar second inner conductor is arranged. Similarly, in the dielectric element body 12, below the inner conductor 16 that separates the ceramic layer 12A, an inner conductor 18 that is also a planar third inner conductor is disposed. A plurality of the inner conductors 14, the inner conductors 16 and the inner conductors 18 which are respectively formed in the same manner are repeatedly arranged at intervals.

Therefore, the three types of internal conductors from the internal conductor 14 to the internal conductor 18 are arranged in the dielectric body 12 so as to be opposed to each other while being separated by the ceramic layer 12A. The centers of the inner conductors 14 to 18 are arranged at substantially the same positions as the centers of the respective ceramic layers 12A.
The vertical and horizontal dimensions from 4 to the internal conductor 18 are smaller than the lengths of the sides of the corresponding ceramic layer 12A.

Further, as shown in FIG.
By protruding the conductor with the same width dimension as the width dimension of the inner conductor 14 from the left side portion toward the left side end portion of the ceramic layer 12A, the first conductor protruding portion 14A for the inner terminal 14 is formed.
Are formed. Separately from this, the conductors are projected from the front side portion and the back side portion of the internal conductor 14 toward the front side end and the back side end of the ceramic layer 12A one by one. Then, two first connecting protrusions 15 are also formed on the inner conductor 14.

Further, the conductor is projected from the right side portion of the inner conductor 16 toward the right end portion of the ceramic layer 12A with the same width dimension as the width dimension of the inner conductor 16, so that the second terminal is formed on the inner conductor 16. 16A for protrusions are formed.
On the other hand, conductors are protruded one by one from the front side portion and the back side portion of the inner conductor 18 toward the front side end and the back side end of the ceramic layer 12A, respectively. Two second connecting projections 19 are formed.

Further, as shown in FIGS. 2 and 3, the terminal electrode 21 connected to the first terminal projecting portion 14A of the inner conductor 14 has the left side surface 12 outside the dielectric body 12.
In addition, the terminal electrode 22 connected to the second terminal protrusion 16A of the internal conductor 16 is disposed on the right side surface 12B, which is the outside of the dielectric body 12.

Also, the two first connecting protrusions 15 of the inner conductor 14 and the two second connecting protrusions 1 of the inner conductor 18.
The connecting electrodes 23 and 24 shown in FIG.
Are disposed on the front side surface 12C and the back side surface 12C, which are outside the dielectric body 12. That is, the two connecting electrodes 23, 24 are connected to each other by the first connecting protrusion 1
5 and the second connecting protrusion 19 are connected outside the dielectric body 12. However, these connecting electrodes 23, 2
No. 4 is not connected to an external circuit because it is intended only to connect the internal conductors outside the dielectric body 12.

As described above, in the present embodiment, the terminal electrodes 21, 2 are provided on the four side faces 12B, 12C of the dielectric body 12 which is a rectangular parallelepiped and has a hexahedral shape of the multilayer capacitor 10.
2 and the connecting electrodes 23 and 24 are arranged respectively. Then, the terminal electrodes 21 among the terminal electrodes 21 and 22 arranged on the left and right side surfaces 12B are connected to, for example, the electrodes of the CPU and the terminal electrodes 22 so that the internal conductors 14 to 18 serve as the electrodes of the capacitor. Is connected to the ground side, for example.

Therefore, as shown in FIGS. 1 and 3, for example, the inner conductor 14 becomes a positive pole and at the same time, the inner conductor 14 becomes
When the adjacent inner conductor 16 becomes a negative pole, the inner conductor 16 is connected to the inner conductor 14 via the first connecting protrusion 15, the connecting electrodes 23 and 24, and the second connecting protrusion 19 accordingly. The inner conductor 18 which becomes a positive pole.

Next, the operation of the multilayer capacitor 10 according to this embodiment will be described. In the multilayer capacitor 10 according to the present embodiment, three types of internal conductors, which are an internal conductor 14, an internal conductor 16 and an internal conductor 18, are interconnected in a dielectric body 12 formed by laminating ceramic layers 12A. In the structure, a plurality of ceramic layers are arranged while being separated by the ceramic layers 12A. Furthermore, a pair of terminal electrodes 21 and 22 that can be connected to an external circuit are arranged outside the dielectric body 12. These pair of terminal electrodes 21, 22
First terminal protrusion 14 connected to the terminal electrode 21
The internal conductor 14 has A, and the internal conductor 16 has a second terminal protrusion 16A connected to the terminal electrode 22.

On the other hand, the inner conductor 14 has two first connecting projecting portions 15 projecting from the front and rear ends of the ceramic layer 12A different from the first terminal projecting portion 14A, and the ceramic is also the same. The inner conductor 18 has two second connecting projections 19 that are respectively projected at the front and rear ends of the layer 12A. Then, the two connecting electrodes 2 respectively arranged outside the dielectric body 12
3, 24 connect the first connecting protrusion 15 and the second connecting protrusion 19 outside the dielectric body 12.

Therefore, the inner conductor 14 connected to the terminal electrode 21 has the first connecting protrusion 15 and the connecting electrodes 23 and 24.
Also, since the internal conductor 18 is connected to the internal conductor 18 via the second connecting protrusion 19, and the internal conductor 18 functions as the same polarity as the internal conductor 14, as the flow path of the current in the multilayer capacitor 10 becomes longer, As a result, the equivalent series resistance of the multilayer capacitor 10 increases.

Therefore, even when the output of the switching power supply is smoothed as the equivalent series resistance increases, the electrolytic capacitor is replaced with a multilayer structure to further increase the capacity. It is now possible to use the laminated capacitor. That is, since the ESR of the multilayer capacitor 10 according to the present embodiment increases, it can be applied to various applications including switching power supplies.

On the other hand, according to the present embodiment, the plurality of first connecting protrusions 15 and the plurality of second connecting protrusions 19 are respectively provided, and the connecting electrodes 23 connecting between them are provided.
Since a plurality of, for example, two 24 are arranged outside the dielectric body 12, the inner conductor 14 and the inner conductor 18 are connected by these two connecting electrodes 23, 24. As a result, as the number of contact points increases and these internal conductors are reliably connected, contact failure or the like becomes less likely to occur.

Further, according to the present embodiment, since the plurality of inner conductors 14 are laminated in the dielectric body 12, not only the ESR is increased, but also the number of laminated inner conductors 14 is appropriately set. By doing so, the ESR can be adjusted to an arbitrary size, so that the ESR can be controlled to a desired value.

Specifically, the equivalent circuit of the multilayer capacitor 10 according to this embodiment is as shown in FIG. In this circuit diagram, C is a capacitor, and R _{11 to} R _1n
Is an equivalent resistance of each of the plurality of inner conductors 14, R _{21 to} R _2n is an equivalent resistance of each of the plurality of inner conductors 16, and R _{31 to} R _3n is an equivalent resistance of each of the plurality of inner conductors 18. Yes, n is the inner conductor 14, 1
The numbers are 6 and 18 respectively. In addition, in FIG.
Each of the internal conductors has two sheets, but in reality, a large number of layers are laminated.

From the above circuit diagram, it is understood from this circuit diagram that the ESR can be adjusted without changing the total number of laminated layers by adding an arbitrary number of the inner conductors 14 and reducing the other inner conductors 16 and 18. It Then, the inner conductor 14 at this time
FIG. 5 shows the amount of change in ESR depending on the number of stacked layers. In other words, from this figure, due to the change in the number of laminated inner conductors 14,
It can be understood that the ESR changes.

Next, a multilayer capacitor according to a second embodiment of the present invention will be described with reference to FIG. The same members as those described in the first embodiment are designated by the same reference numerals, and the duplicate description will be omitted. As shown in FIG. 6, in the present embodiment, a pair of one cut portions 31 extending inward from the inner side of the inner conductor 14 and a pair of one cut portions formed between the pair of one cut portions are provided in front of the inner conductor 14. The two cutout portions 32 extending inward from the side are provided so as to cut into the internal conductor 14. Therefore, by providing the plurality of cut portions 31 and 32 in the inner conductor 14 as described above, the flow path of the current is elongated in a zigzag shape, and the effect of increasing the equivalent series resistance is further increased. .

Next, a multilayer capacitor according to a third embodiment of the present invention will be described with reference to FIG. The same members as those described in the first embodiment are designated by the same reference numerals, and the duplicate description will be omitted. As shown in FIG. 7, the present embodiment has a structure in which the width dimension of the portion of the internal conductor 14 excluding the first terminal protrusion 14A is narrower than the width dimension of the first terminal protrusion 14A. .

That is, the width dimension of the first terminal protrusion 14A is maintained at a constant size, and the width dimension of the inner conductor 14 is narrowed, whereby the first terminal protrusion 14A is formed.
As the current flows through the narrow inner conductor 14 while being reliably connected to the terminal electrode 21, the electric resistance of the inner conductor 14 increases, and the effect of increasing the equivalent series resistance further increases.

Next, a multilayer capacitor according to a fourth embodiment of the present invention will be described with reference to FIGS. 8 and 9. The same members as those described in the first embodiment are designated by the same reference numerals, and the duplicate description will be omitted. 8 and 9
As shown in FIG. 5, the inner conductor 44 that is the first inner conductor of the multilayer capacitor 40 according to the present embodiment is the ceramic layer 1
It has a total of four first terminal projecting portions 44A, two projecting portions 44A projecting from the front and rear ends of 2A, respectively.
In addition, the inner conductor 44 has the first terminal protrusion 44.
It also has a pair of first connecting protrusions 45 protruding from the left and right ends which are the ends of the ceramic layer 12A different from A.

The inner conductor 46, which is the second inner conductor, has four second protrusions 46A for the second terminal, each of which protrudes from the front and rear ends of the ceramic layer 12A. . However, these second terminal projecting portions 46A are arranged so as not to overlap the first terminal projecting portions 44A,
The first terminal protruding portion 44A is displaced from the first terminal protruding portion 44A. Further, the inner conductor 48 that is the third inner conductor is
The ceramic layer 12A has second connecting protrusions 49 protruding from the left and right ends thereof, respectively. Then, as shown in FIG. 9, the pair of connecting electrodes 53, 54 arranged at the left and right ends on the outer side of the dielectric body 12 are provided with the first connecting protrusions 4.
5 and the second connecting protrusion 49 are connected to each other outside the dielectric body 12.

On the other hand, as shown in FIG.
A total of eight terminal electrodes 51, 52, each of which is four, are arranged on the outer side of, so that they can be connected to an external circuit. That is, the multilayer capacitor 40 of the present embodiment is a multi-terminal type multilayer capacitor, and the adjacent terminal electrodes 5 are
1, 52 are used in the opposite polarities. Specifically, it is divided into a set of terminal electrodes 51 connected to the first terminal projecting portion 44A and a set of terminal electrodes 52 connected to the second terminal projecting portion 46A, each of which is connected to an external circuit. Can be done.

As described above, also in the present embodiment, the internal conductor 44 connected to the terminal electrode 51 is connected to the internal conductor 48 via the first connecting protrusion 45, the connecting electrodes 53 and 54, and the second connecting protrusion 49. The inner conductor 48 is connected to the inner conductor 4
4, the equivalent series resistance of the multilayer capacitor 40 increases as the flow path of the current in the multilayer capacitor 40 becomes longer. As a result, similarly to the first embodiment, the multilayer capacitor 40 according to the present embodiment can be applied to various uses including a switching power supply.

Next, a multilayer capacitor according to a fifth embodiment of the present invention will be described with reference to FIG. The same members as those described in the first embodiment are designated by the same reference numerals, and the duplicate description will be omitted. As shown in FIG. 10, in the present embodiment, the inner conductor 14, the inner conductor 16 and the inner conductor 18 are provided as in the first embodiment. However, in the present embodiment, the first conductor formed on the inner conductor 14
The number of the connecting protrusion 15 is only one protruding toward the rear end of the ceramic layer 12A, and the second connecting protrusion 19 formed on the inner conductor 18 corresponds to this. Only one is projected toward the rear end of the ceramic layer 12A.

On the other hand, the inner conductor 16 is provided with one first connecting protrusion 17 protruding toward the front end of the ceramic layer 12A. An internal conductor 60, which is also a planar third internal conductor, is arranged below the internal conductor 18 that separates the ceramic layer 12A in the dielectric element body 12.
One second connecting protrusion 61 is formed on the side of the ceramic layer 12A so as to protrude toward the front end of the ceramic layer 12A.

Further, similarly to the first embodiment shown in FIG. 2, the terminal electrode 2 is also provided in the present embodiment (not shown).
1, 22 are arranged on the left and right side surfaces 12B of the dielectric body 12, and the connecting electrodes 23, 24 are arranged on the dielectric body 1.
2 are arranged on the front side surface 12C and the rear side surface 12C, respectively, and the connecting electrode 23 is provided between the first connection projecting portion 17 and the second connection projecting portion 61.
Is connected outside.

That is, in this embodiment, the inner conductor 16
Also serves as the first inner conductor, and the inner conductor 60 serves as the third inner conductor, so that the same effects as those of the first embodiment can be obtained in this embodiment. .

On the other hand, the result of a test for comparing the impedance between the multilayer capacitor according to the embodiment and the capacitor of the conventional example using an impedance analyzer is shown below. As the conventional capacitor to be compared here, the multilayer capacitor 100 shown in FIG. 13 was used. On the other hand, as the multilayer capacitor according to the embodiment, for example, the one according to the first embodiment is used.

As shown in FIG. 11 showing the measurement result, the characteristic curve A showing the characteristic of the conventional capacitor has a portion where the impedance is extremely lowered and resonance occurs in the vicinity of the frequency exceeding 1000 KHz. However, in the characteristic curve B representing the characteristics of the multilayer capacitor 10 according to the embodiment, there is no such portion, and resonance does not occur.

Further, as a result of measuring the equivalent series resistance value of these samples, the equivalent series resistance value of the conventional capacitor is 3.
It was 0 mΩ. On the other hand, the equivalent series resistance value of the multilayer capacitor 10 according to the embodiment was 56.5 mΩ. That is, E of the multilayer capacitor 10 according to the embodiment
It was confirmed that SR was clearly increased as compared with the conventional capacitor.

The ESR value is the value at the self-resonant frequency f ₀ shown in FIG. Here, in this figure, ESL is the equivalent series inductance and C is the capacitance. Also, each capacitor used in the test is 321
There are 6 types, and the electrostatic capacitance values are both 10 μF. Here, the 3216 type refers to a size of 3.2 mm in length and 1.6 mm in width.

On the other hand, the number of the internal conductors is not limited to the number of the multilayer capacitors 10 according to the above-mentioned embodiment, and may be larger, and the order of the internal conductors in the stacking direction may be arbitrarily changed. good. Further, the structure of the internal conductor is not limited to that described in the above embodiment, and the number of terminal electrodes may be further increased or the number of cuts may be four or more, for example.

[0051]

According to the present invention, it is possible to provide a multilayer capacitor applicable to various uses by increasing the ESR.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing a multilayer capacitor according to a first embodiment of the present invention.

FIG. 2 is a perspective view showing a multilayer capacitor according to the first embodiment of the present invention.

3 is a cross-sectional view showing the multilayer capacitor according to the first embodiment of the present invention, which is a view corresponding to a cross section taken along the line 3-3 of FIG.

FIG. 4 is a circuit diagram showing an equivalent circuit of the multilayer capacitor according to the first embodiment of the invention.

FIG. 5 is a diagram showing a graph showing the amount of change in ESR according to the number of stacked first internal conductors.

FIG. 6 is an exploded perspective view showing a multilayer capacitor according to a second embodiment of the present invention.

FIG. 7 is an exploded perspective view showing a multilayer capacitor according to a third embodiment of the present invention.

FIG. 8 is an exploded perspective view showing a multilayer capacitor according to a fourth embodiment of the present invention.

FIG. 9 is a perspective view showing a multilayer capacitor according to a fourth embodiment of the present invention.

FIG. 10 is an exploded perspective view showing a multilayer capacitor according to a fifth embodiment of the present invention.

FIG. 11 is a diagram showing a graph comparing the impedance characteristics of the conventional example and the embodiment.

FIG. 12 is a diagram showing a graph showing impedance characteristics of a capacitor.

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

FIG. 14 is an exploded perspective view showing a conventional multilayer capacitor.

FIG. 15 is a circuit diagram showing an equivalent circuit of a conventional multilayer capacitor.

[Explanation of symbols]

10 Multilayer capacitors 12 Dielectric body 12A ceramic layer 14 Inner conductor (first inner conductor) 16 inner conductor (second inner conductor) 18 inner conductor (third inner conductor) 21, 22 terminal electrodes 23, 24 connecting electrodes 40 Multilayer Capacitor 44 inner conductor (first inner conductor) 46 inner conductor (second inner conductor) 48 inner conductor (third inner conductor) 51, 52 terminal electrodes 53, 54 connection electrode

Claims (5)

[Claims] 1. A dielectric body formed by laminating dielectric layers, at least a pair of terminal electrodes arranged outside the dielectric body and respectively connectable to an external circuit, and a dielectric body. A first terminal protrusion that is arranged and protrudes from an end of the dielectric layer and is connected to one of the terminal electrodes, and a first protrusion that protrudes from an end of the dielectric layer different from the first terminal protrusion. A first inner conductor having a connecting protrusion, and a first inner conductor arranged in the dielectric body while being separated from the first inner conductor by a dielectric layer, and protruding to an end of the dielectric layer to the other terminal electrode. A second inner conductor having a second terminal projecting portion to be connected, and a first inner conductor and a second inner conductor are arranged in the dielectric body while being separated from each other by the dielectric layer, and A third inner conductor having a second connecting protrusion protruding at an end, and a dielectric The first connection protruding portion is disposed outside the body and the second
A multi-layer capacitor, comprising: a connecting electrode for connecting the connecting projection to the outside of the dielectric body. 2. The multilayer capacitor according to claim 1, wherein a plurality of first internal conductors are laminated in a dielectric body. 3. A plurality of first connecting protrusions and a plurality of second connecting protrusions are provided respectively, and a plurality of connecting electrodes for connecting these are arranged outside the dielectric body. The multilayer capacitor according to claim 1 or 2. 4. The multilayer capacitor according to claim 1, wherein a cut portion is provided in the first inner conductor. 5. The width of a portion of the first inner conductor excluding the protrusion for the first terminal is formed to be narrower than the width of the protrusion for the first terminal. The multilayer capacitor according to any one of the above.