JP3907599B2 - Multilayer capacitor - Google Patents

Multilayer capacitor Download PDF

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Publication number
JP3907599B2
JP3907599B2 JP2003061473A JP2003061473A JP3907599B2 JP 3907599 B2 JP3907599 B2 JP 3907599B2 JP 2003061473 A JP2003061473 A JP 2003061473A JP 2003061473 A JP2003061473 A JP 2003061473A JP 3907599 B2 JP3907599 B2 JP 3907599B2
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inner conductor
element body
conductor
end
inner
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JP2004273701A (en
Inventor
正明 富樫
修 本庄
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Tdk株式会社
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Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a multilayer capacitor that can be applied to various applications by increasing ESR (equivalent series resistance) and suppressing voltage oscillation of a power supply.
[0002]
[Prior art]
Among the multilayer capacitors, the multilayer ceramic capacitors have the characteristics that the ESR (equivalent series resistance) is smaller than that of electrolytic capacitors and have excellent high frequency characteristics. In recent years, body thinning and multilayering have remarkably advanced. As a result, large-capacity monolithic ceramic capacitors having a large capacitance comparable to aluminum electrolytic capacitors and tantalum electrolytic capacitors have appeared.
[0003]
In recent years, the multilayering of multilayer ceramic capacitors has caused not only an increase in capacitance but also a tendency for ESR to further decrease. In other words, the ESR at the time of high-frequency fluctuation of the current is dominated by the electrical resistance of the inner conductor. Therefore, when the density of the inner conductor of the multilayer ceramic capacitor is increased by further multilayering, the ESR is further reduced. become.
[0004]
Here, the appearance of the multilayer capacitor 100 which is this conventional multilayer ceramic capacitor is shown in FIG. 12, the internal structure is shown in FIG. 13, and the equivalent circuit is shown in FIG. A conventional multilayer capacitor 100 will be described below based on these drawings.
That is, the multilayer capacitor 100 has a structure in which two types of internal conductors 114 and 116 shown in FIG. 13 overlap with each other via the ceramic layer 112A so that a large capacitance can be obtained.
[0005]
The inner conductor 114 is drawn out to any one of the four side faces of the laminate 112 formed by laminating a large number of these ceramic layers 112A, and the side face from which the inner conductor 114 is drawn out. An inner conductor 116 is drawn out on the opposite side surface. Furthermore, the terminal electrode 118 connected to the internal conductor 114 and the terminal electrode 120 connected to the internal conductor 116 are respectively installed on the mutually opposing 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 order along the stacking direction of the multilayer body 112.
[0006]
Due to such a structure, an equivalent circuit in the conventional multilayer multilayer capacitor 100 is as shown in FIG.
That is, the equivalent resistance of the inner conductor 114 itself is RC1~ RCnThe equivalent resistance of the inner conductor 116 itself is RD1~ RDnWhere n represents the number of each internal conductor. And RC1~ RCnAnd RD1~ RDnAs can be understood from the fact that they are arranged in parallel, the ESR decreases in inverse proportion to the number of stacked layers.
[0007]
[Patent Document 1]
Japanese Patent Laid-Open No. 06-140283
[Patent Document 2]
Japanese Patent Laid-Open No. 08-97070
[Patent Document 3]
JP 2000-31830 A
[Patent Document 4]
JP 2001-52952 A
[0008]
[Problems to be solved by the invention]
On the other hand, a large-capacitance capacitor is mainly used for output smoothing of a switching power supply. However, using a capacitor with a small ESR is effective in reducing the output ripple voltage. However, if the ESR is too small, the output voltage becomes unstable or abnormal oscillation occurs for the control system of the switching power supply. There was a drawback of waking up. This is because when a capacitor having an excessive 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.
[0009]
For this reason, electrolytic capacitors having a larger ESR than multilayer capacitors are often used in applications such as smoothing the output of a switching power supply. On the other hand, from the viewpoints of cost reduction and miniaturization, it is desired to use multilayer capacitors for such applications, but the multilayer capacitors will be further multilayered by aiming for higher capacity in the future. As described above, there is a possibility that the ESR is further reduced and the ESR is excessively reduced.
In view of the above facts, an object of the present invention is to provide a multilayer capacitor applicable to various applications by increasing ESR.
[0010]
[Means for Solving the Problems]
  The multilayer capacitor according to claim 1 is an element body formed by laminating a multilayer body;
  At least a pair of terminal electrodes arranged outside the element body and respectively connected to an external circuit;
  A first internal conductor disposed in a form having a bent portion in the element body and having one end connected to one of the pair of terminal electrodes;
  A planar second inner conductor that is disposed in the element body while being separated from the first inner conductor by the laminate layer, and one end of which is drawn out to a side surface of the element body;
  A connecting electrode disposed outside the element body and connecting the other end of the first inner conductor and one end of the second inner conductor on the outer side of the element body;
  A third inner conductor disposed in the element body while being separated from the first inner conductor and the second inner conductor by the multilayer body layer, and having one end drawn out from a side surface of the element body and connected to the other terminal electrode; ,
  With
  The first inner conductor meanders with a plurality of bent portions.And separated from each other by a laminate layerA relay electrode configured by a plurality of conductor extensions and connecting the conductor extensions in series outside the element body is arranged outside the element body.
[0011]
In the multilayer capacitor according to claim 1, the first inner conductor, the second inner conductor, and the third inner conductor are separated from each other by the multilayer body in the element body formed by laminating the multilayer body layers. It has a structure that is arranged. Further, a pair of terminal electrodes that can be connected to the external circuits are disposed outside the element body. The first inner conductor of these inner conductors not only has a bent portion, but both ends thereof are drawn out to the side surfaces of the element body, and the first inner conductor is connected to one terminal electrode of the pair of terminal electrodes. One end of the conductor is connected.
[0012]
  Then, the connecting electrode arranged outside the element body has a gap between the other end of the first inner conductor and the one end of the planar second inner conductor drawn to the side surfaces of the element body. Connected. Further, one end of the third inner conductor is drawn out to the side surface of the element body and connected to the other terminal electrode.
  Further, the first inner conductor has a meandering shape having a plurality of bent portions.And separated from each other by a laminate layerA relay electrode configured by a plurality of conductor extensions and connecting the conductor extensions in series outside the element body is disposed outside the element body.
[0013]
  As described above, since the first inner conductor connected to one terminal electrode is connected to the second inner conductor via the connecting electrode, the second inner conductor has the same polarity as the first inner conductor. Function as. As a result, the equivalent series resistance of the multilayer capacitor increases as the current flows to the second inner conductor via the first inner conductor having a bent portion and a longer flow path for current flow.
  In addition, while meandering with a plurality of bent parts,, Separated from each other by laminate layersBy forming the first inner conductor by the plurality of conductor extensions connected to each other by the relay electrode, the current flow path is further elongated in a bent shape. For this reason, the effect of increasing the equivalent series resistance is not only further increased, but the equivalent series resistance can be adjusted to a desired value by stacking, for example, an appropriate number of the conductor extensions.
[0014]
For this reason, even in applications such as smoothing the output of a switching power supply with an increase in equivalent series resistance, a multilayer structure that achieves higher capacity by multilayering instead of electrolytic capacitors Capacitors can be used. That is, since the multilayer capacitor according to the present invention has an increased ESR, it can be applied to various uses including a switching power supply.
[0015]
According to the multilayer capacitor of claim 2, in addition to the configuration similar to that of the multilayer capacitor of claim 1, the multilayer capacitor has a configuration in which a plurality of second internal conductors and third internal conductors are alternately stacked in the element body. is doing. Therefore, according to this claim, not only the ESR is simply increased, but the capacitance value is arbitrarily increased as the number of layers of the second inner conductor and the third inner conductor is appropriately set. It will come to be adjusted.
[0018]
  Claim3According to the multilayer capacitor according to claim 1,And claim 2In addition to the configuration similar to the multilayer capacitor, the multilayer layer separating at least the second inner conductor and the third inner conductor is a dielectric layer. Therefore, according to this claim, the laminated body layer excluding the portion that separates the second inner conductor and the third inner conductor is formed of another material having insulating properties other than the dielectric layer. It will be good. Along with this, the range of selection of materials constituting the multilayer capacitor is widened, and the manufacturing cost of the multilayer capacitor can be reduced.
[0019]
  The multilayer capacitor according to claim 4 includes an element body formed by laminating a multilayer body,
  At least a pair of terminal electrodes arranged outside the element body and respectively connected to an external circuit;
  A first internal conductor which is arranged in a meandering manner with a plurality of bent portions in the element body, and one end of which is connected to one of the pair of terminal electrodes;
  A planar second inner conductor that is disposed in the element body while being separated from the first inner conductor by the laminate layer, and one end of which is drawn out to a side surface of the element body;
  A first connecting electrode disposed outside the element body and connecting the other end of the first inner conductor and one end of the second inner conductor on the outer side of the element body;
  A planar third inner conductor disposed in the element body while being separated from the first inner conductor and the second inner conductor by the multilayer body layer, and having one end drawn to the side surface of the element body;
  The first inner conductor to the third inner conductor are separated from each other by a laminated body layer, and are arranged in a meandering manner having a plurality of bent portions in the element body, and one end is connected to the other terminal electrode. 4 inner conductors;
  A second electrode disposed at a portion facing the first connection electrode on the outer side of the element body and connecting between one end of the third inner conductor and the other end of the fourth inner conductor on the outer side of the element body; A connecting electrode;
  With
  The first inner conductor and the fourth inner conductor, which are not connected to each other by any connecting electrode but have different polarities, have the same shape as each other, and are not connected to each other by any connecting electrode. The second inner conductor and the third inner conductor, which have different polarities from each other, have the same shape.,
  The pair of terminal electrodes, the first connection electrode, and the second connection electrode are respectively disposed on different side surfaces of the element body.It is characterized by that.
[0020]
  Claim4The multilayer capacitor according to the present invention has a structure in which the first inner conductor to the fourth inner conductor are arranged while being separated from each other by the multilayer body in the element body formed by laminating the multilayer body layers. ing. Further, similarly to the first aspect, a pair of terminal electrodes that can be connected to an external circuit are arranged outside the element body.
  Of these inner conductors, the first inner conductor and the fourth inner conductor have bent portions.Have multiple meandersIn addition, both ends of the element body are drawn out to the side surfaces of the element body, and one end of the first inner conductor is connected to one terminal electrode of the pair of terminal electrodes, and the other terminal electrode is connected to the terminal electrode. One end of the fourth inner conductor is connected.
[0021]
  And the 1st connection electrode arrange | positioned on the outer side of an element | base_body is between an other end of the 1st internal conductor pulled out by the side surface of an element | base_body, and one end of a planar 2nd internal conductor, respectively. The connection is made outside. In addition, the second connection electrode arranged at the portion facing the first connection electrode outside the element body is connected to one end of the planar third inner conductor drawn out to the side surface of the element body and the fourth inner electrode. The other end of the conductor is connected outside the element body.
  Furthermore, the first inner conductor and the fourth inner conductor, which are not connected to each other by any connecting electrode but have different polarities, have the same shape as each other, and are connected to each other by any connecting electrode. The second inner conductor and the third inner conductor, which have different polarities from each other, have the same shape.In addition, the pair of terminal electrodes, the first connection electrode, and the second connection electrode are respectively disposed on different side surfaces of the element body.
[0022]
As described above, since the first inner conductor connected to one terminal electrode is connected to the second inner conductor via the first connecting electrode, the second inner conductor is connected to the first inner conductor. Functions as the same polarity. In addition, since the fourth inner conductor connected to the other terminal electrode is connected to the third inner conductor via the second connecting electrode, the third inner conductor is connected to the fourth inner conductor. Functions as the same polarity.
[0023]
As a result, a current flows to the second inner conductor through the first inner conductor having a bent portion and a longer flow path for current flow, and the fourth inner conductor having a longer flow path is also provided. As the current flows through the third inner conductor, the equivalent series resistance of the multilayer capacitor increases.
[0024]
For this reason, according to this claim, as the equivalent series resistance increases in the same manner as in claim 1, the capacity can be increased even in applications such as smoothing the output of the switching power supply. Therefore, the multilayer capacitor can be used for various applications including a switching power supply.
[0025]
  Claim5And claims6According to the multilayer capacitor according to claim4In addition to the same configuration as the multilayer capacitor of claim 1,5Has the same structure as claim 2,6Claims3It has the same composition as. Therefore, according to these claims, the claims4In addition to the same effect as in claim 2, claim 2 or claim3The same effect will be achieved.
[0026]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of a multilayer capacitor according to the present invention will be described below with reference to the drawings.
A multilayer capacitor 10 which is a multilayer ceramic capacitor according to a first embodiment of the present invention is shown in FIGS. As shown in these figures, a multilayer capacitor 10 is configured with a dielectric body 12 that is a rectangular parallelepiped sintered body obtained by firing a laminated body in which a plurality of ceramic green sheets are laminated as a main part. ing.
[0027]
That is, the dielectric body 12 is formed by laminating dielectric layers that are fired ceramic green sheets. An inner conductor 14 having a plurality of bent portions 14C which are bent portions of the conductor and formed in a meandering shape is disposed at a predetermined height position in the dielectric body 12; A plurality of bent portions 15C, which are portions where the conductor is bent, are formed below the inner conductor 14 across the ceramic layer 12A which is a dielectric layer in the dielectric body 12, and are formed in a meandering shape. The formed inner conductor 15 is disposed. For this reason, the inner conductor 14 and the inner conductor 15 serve as conductor extensions constituting the first inner conductor.
[0028]
An inner conductor 16 that is a planar second inner conductor is disposed below the inner conductor 15 that separates the ceramic layer 12 </ b> A in the dielectric element body 12, and the ceramic layer is also formed in the dielectric element body 12. An inner conductor 17 that is also a planar third inner conductor is disposed below the inner conductor 16 that is separated by 12A. A plurality of internal conductors 16 and internal conductors 17 formed in a planar shape are repeatedly laminated alternately in the dielectric element body 12 with the ceramic layers 12A being separated from each other.
[0029]
Therefore, the four types of internal conductors from the internal conductor 14 to the internal conductor 17 are arranged to face each other while being separated by the ceramic layer 12A in the dielectric element body 12. The centers of the planar inner conductor 16 and the inner conductor 17 are arranged at substantially the same positions as the centers of the ceramic layers 12A, and the vertical and horizontal dimensions of the inner conductor 16 and the inner conductor 17 correspond to the corresponding ceramics. The length of each side of the layer 12A is set to be smaller.
[0030]
Further, as shown in FIG. 1, one end of the inner conductor 14 is drawn from the left portion of the inner conductor 14 toward the left end of the ceramic layer 12A, so that one end of the inner conductor 14 is connected to the terminal lead portion 14A. In addition, the other end of the internal conductor 14 is drawn out toward the end on the near side of the ceramic layer 12A, so that the other end of the internal conductor 14 serves as a connection lead-out portion 14B.
[0031]
Separately, both ends of the inner conductor 15 are drawn out toward the front end and the rear end of the ceramic layer 12A, respectively, and one end of the inner conductor 15 is connected to the front connection lead. The other end of the inner conductor 15 is a connection lead portion 15B on the back side.
[0032]
On the other hand, one conductor is drawn out from the back side portion of the planar internal conductor 16 toward the back side end portion of the ceramic layer 12A, so that one end of the internal conductor 16 serves as a connection lead portion 16A. . Further, the conductor is drawn out from the right side portion of the planar inner conductor 17 toward the right end portion of the ceramic layer 12A with the same width dimension as the inner conductor 17, so that one end of the inner conductor 17 is connected to the terminal. It is used as a drawer portion 17A. Therefore, in this embodiment, both ends of the inner conductors 14 and 15 and one end of the inner conductors 16 and 17 are structured to be drawn out to the four side surfaces 12B and 12C of the dielectric body 12, respectively.
[0033]
Further, the terminal electrode 21 connected to the terminal lead portion 14A of the inner conductor 14 is disposed on the left side surface 12B which is the outer side of the dielectric body 12, as shown in FIG. Terminal electrodes 22 respectively connected to the 17 terminal lead portions 17A are arranged on the right side surface 12B in FIG.
[0034]
On the other hand, an external relay electrode shown in FIG. 2 is connected to the connecting lead portion 14B of the internal conductor 14 and the connecting lead portion 15A of the internal conductor 15 to connect the internal conductor 14 and the internal conductor 15 in series. The electrode 23 is disposed on the front side surface 12 </ b> C that is the outside of the dielectric body 12. Further, the outer electrode 24 which is the connecting electrode shown in FIG. 2 connected to the connecting lead portion 15B of the inner conductor 15 and the connecting lead portion 16A of each inner conductor 16 is the inner side of the dielectric body 12. It is arranged on the side surface 12C. However, the external electrode 23 and the external electrode 24 are not connected to the external circuit because they are intended only to connect the internal conductors outside the dielectric element body 12.
[0035]
As described above, in the present embodiment, the terminal electrodes 21 and 22, the external electrode 23, and the external electrode 24 are respectively provided on the four side surfaces 12 </ b> B and 12 </ b> C of the dielectric body 12 that is a rectangular parallelepiped of the multilayer capacitor 10 and has a hexahedral shape. Will be placed. The terminal electrodes 21 of the terminal electrodes 21 and 22 arranged on the left and right side surfaces 12B are connected to the electrodes of the CPU, for example, so that the inner conductors 16 and 17 become the electrodes of the capacitor, and the terminal electrode 22 Is connected to the ground side, for example.
[0036]
Therefore, for example, when the terminal electrode 21 connected to the internal conductor 14 becomes a positive pole and at the same time the terminal electrode 22 connected to the internal conductor 17 becomes a negative pole, the connection lead 14B, the external electrode 23, and the connection lead 15A are interposed. The internal conductor 15 connected to the internal conductor 14 not only becomes a positive pole, but also the internal conductor 16 connected to the internal conductor 15 via the connecting lead 15B, the external electrode 24, and the connecting lead 16A becomes a positive pole. .
[0037]
Next, the operation of the multilayer capacitor 10 according to the present embodiment will be described.
The multilayer capacitor 10 according to the present embodiment includes four types of internal conductors 14, an internal conductor 15, an internal conductor 16 and an internal conductor 17 in a dielectric body 12 formed by laminating ceramic layers 12A. The conductors are arranged while being separated from each other by the ceramic layer 12A.
[0038]
Of these inner conductors, the inner conductor 14 and the inner conductor 15 have not only a meandering structure having a plurality of bent portions 14C and 15C, respectively, but also the side surfaces 12B and 12C of the dielectric body 12 at both ends thereof. Are pulled out respectively. In addition, a plurality of internal conductors 16 and internal conductors 17 are alternately stacked in the dielectric body 12. Further, a pair of terminal electrodes 21 and 22 that can be connected to an external circuit are disposed outside the dielectric element body 12. The internal conductor 14 has a terminal lead portion 14A connected to the terminal electrode 21 of the pair of terminal electrodes 21 and 22, and the terminal lead portion 17A connected to the terminal electrode 22 is provided in each internal portion. The conductor 17 has.
[0039]
Similarly, external electrodes 23 arranged on the outer side of the dielectric element body 12 are connected to the connection lead part 14B of the inner conductor 14 and the connection lead part 15A of the inner conductor 15 respectively drawn out to the side surfaces of the dielectric element body 12. Are connected in series on the outside of the dielectric body 12. Similarly, external electrodes 24 arranged on the outside of the dielectric body 12 are connected to the connecting lead portions 15B of the internal conductor 15 and the connecting lead portions 16A of the internal conductors 16 drawn to the side surfaces of the dielectric body 12, respectively. The gap is connected outside the dielectric body 12.
[0040]
As described above, the internal conductor 14 connected to the terminal electrode 21 is connected to the internal conductor 15 via the external electrode 23, and the internal conductor 15 is connected to each internal conductor 16 via the external electrode 24. Each inner conductor 16 functions as the same polarity as the inner conductor 14. As a result, as current flows to each internal conductor 16 through the inner conductors 14 and 15 in which the conductors that have the bent portions 14C and 15C and the current flows through the zigzags are narrow and long, The equivalent series resistance of the capacitor 10 increases.
[0041]
For this reason, even in applications such as smoothing the output of a switching power supply with an increase in equivalent series resistance, a multilayer structure that achieves higher capacity by multilayering instead of electrolytic capacitors Capacitors can be used. That is, since the multilayer capacitor 10 according to the present embodiment increases the ESR, it can be applied to various applications including a switching power supply.
[0042]
Furthermore, according to the present embodiment, a plurality of the internal conductors 16 and the internal conductors 17 are alternately laminated in the dielectric element body 12, so that according to the present embodiment, the ESR is simply increased. As the number of the inner conductors 16 and the inner conductors 17 is appropriately set, the capacitance value is adjusted to an arbitrary value.
[0043]
On the other hand, in the present embodiment, the first inner conductor is constituted by the inner conductors 14 and 15 disposed in the dielectric body 12 having the bent portions 14C and 15C, respectively. An external electrode 23 that is connected in series with the external electrode 15 is disposed outside the dielectric body 12.
[0044]
Therefore, according to the present embodiment, the inner conductor 14 and the inner conductor 15 each having the bent portions 14C and 15C are connected in series by the outer electrode 23, so that the current flow path is bent and further elongated. Will grow. Therefore, the effect of increasing the equivalent series resistance is not only further increased, but the equivalent series resistance can be adjusted to a desired value by laminating an appropriate number of these internal conductors 14 and 15.
[0045]
On the other hand, in the present embodiment, all the laminated layers are the ceramic layers 12A which are dielectric layers, but at least the laminated layers separating the internal conductors 16 and the internal conductors 17 are ceramic layers 12A. I just need it. That is, the laminated body layer excluding the portion separating the inner conductor 16 and the inner conductor 17 may be formed of another material having simply insulating properties other than the ceramic layer 12A. Along with this, the range of selection of materials constituting the multilayer capacitor 10 of the present embodiment is widened, and the manufacturing cost of the multilayer capacitor 10 can be reduced.
[0046]
Specifically, an equivalent circuit of the multilayer capacitor 10 according to the present embodiment is as shown in FIG. In this circuit diagram, R14Is the resistance of the inner conductor 14 and R15Is the resistance of the inner conductor 15 and C1~ CnIs the electrostatic capacity between the inner conductors 16 and 17, respectively, and n is the number of stacked layers of the inner conductors 16 and 17, respectively.
[0047]
In FIG. 3, three inner conductors 16 and 17 are provided, but a large number of them are actually stacked. From the above, if the multilayer capacitor 10 of the present embodiment, R14, R15It can be understood from this circuit diagram that ESR (equivalent series resistance) can be increased by the presence of. From this circuit diagram, it can also be understood that the ESR is further increased by increasing the number of laminated inner conductors 14 and 15.
[0048]
The ESR can be estimated by the following formula 1 for the inner conductors 14 and 15 each having a meandering shape.
ESR = ρ · L / (W · T) ... Equation 1
In this equation 1, ρ is the specific resistance of the electrode material constituting the inner conductors 14 and 15, L is the length dimension of the conductor constituting the inner conductors 14 and 15, and W is the width of the conductor constituting the inner conductors 14 and 15. The dimension T is the thickness dimension of the inner conductors 14 and 15.
[0049]
Next, a multilayer capacitor according to a second embodiment of the present invention will be described with reference to FIG. In addition, the same code | symbol is attached | subjected to the member same as the member demonstrated in 1st Embodiment, and the duplicate description is abbreviate | omitted.
As shown in FIG. 5, in the present embodiment, instead of having no internal conductor 15, an internal conductor 18, which is a planar second internal conductor, is disposed in the dielectric body 12. The inner conductor 18 is formed in a structure in which a connecting lead portion 18A is drawn from the front side portion toward the front side end portion of the ceramic layer 12A. In this embodiment, the external electrode 23 serving as the first connection electrode is connected between the connection lead portion 14B of the internal conductor 14 and the connection lead portion 18A of the internal conductor 18.
[0050]
In addition, in the present embodiment, an internal conductor 16 serving as a third internal conductor is disposed below the internal conductor 18 across the ceramic layer 12A. Further, the internal conductor 18 and the internal conductor 16 are alternately arranged. The structure is such that a plurality of the inner conductors 18 and 16 are repeatedly laminated and used as capacitor electrodes. For this reason, the connecting lead portions 18 </ b> A of the internal conductors 18 are also connected to each other via the external electrode 23.
[0051]
In addition, an inner conductor 19 that is a fourth inner conductor having a plurality of bent portions 19C and formed in a meandering manner is disposed below the lowermost inner conductor 16. One end of the inner conductor 19 is drawn from the right side portion of the inner conductor 19 toward the right end of the ceramic layer 12A, so that one end of the inner conductor 19 serves as a terminal lead portion 19A. The other end of the internal conductor 19 is drawn out toward the end on the side, so that the other end of the internal conductor 19 serves as a connection lead-out portion 19B.
[0052]
Therefore, in the present embodiment, the terminal lead portion 19A of the internal conductor 19 is connected to the terminal electrode 22, and in the present embodiment, each terminal electrode 22 is connected to the terminal electrode 22 via the external electrode 24 that is the second connection electrode. Not only the connecting lead portions 16A of the inner conductor 16 but also the connecting lead portions 19B of the inner conductor 19 are connected.
[0053]
As described above, since the internal conductor 14 connected to the terminal electrode 21 is connected to the internal conductor 18 via the external electrode 23, the internal conductor 18 functions as the same polarity as the internal conductor 14. Further, since the internal conductor 19 connected to the terminal electrode 22 is connected to the internal conductor 16 via the external electrode 24, the internal conductor 16 functions as the same polarity as the internal conductor 19.
[0054]
As a result, in the present embodiment also, the current flows to the internal conductor 18 through the internal conductor 14 having the bent portion 14C and the flow path becomes long, and the flow path becomes long by having the bent portion 19C. As current flows through the internal conductor 19 to the internal conductor 16, the equivalent series resistance of the multilayer capacitor 10 increases.
[0055]
Next, a multilayer capacitor according to a third embodiment of the present invention will be described with reference to FIG. In addition, the same code | symbol is attached | subjected to the member same as the member demonstrated in 1st Embodiment, and the duplicate description is abbreviate | omitted.
As shown in FIG. 6, in the present embodiment as well, the internal conductor 18 is disposed below the internal conductor 14 with the ceramic layer 12A separated, as in the second embodiment. Further, the inner conductor 17 described in the first embodiment is disposed below the inner conductor 18 with the ceramic layer 12A therebetween. In the following, the inner conductor 18 and the inner conductor 17 are repeatedly stacked in the dielectric element body 12 one by one.
[0056]
As described above, in the present embodiment as well as the first embodiment and the second embodiment, a plurality of bent portions 14C are provided and the internal conductor 14 is provided with a long flow path for current flow. As the current flows through the conductor 18, the equivalent series resistance of the multilayer capacitor 10 increases. However, in this embodiment, since the internal conductor 16 is not used, the manufacturing cost of the multilayer capacitor 10 is reduced to the extent that the external electrode 24 is unnecessary.
[0057]
Next, a multilayer capacitor according to a fourth embodiment of the present invention will be described with reference to FIG. In addition, the same code | symbol is attached | subjected to the member same as the member demonstrated in 1st Embodiment, and the duplicate description is abbreviate | omitted.
As shown in FIG. 7, in the present embodiment, as in the third embodiment, the internal conductor 14, the internal conductor 18, and the internal conductor 17 are arranged in the dielectric element body 12. The inner conductor 18 of the present embodiment has not only a connection lead portion 18A on the front side portion but also a connection drawn from the back side portion toward the back end of the ceramic layer 12A. It has a shape having a drawing-out portion 18B.
[0058]
Therefore, in the present embodiment, as the internal conductors 18 and the internal conductors 17 are alternately laminated, a plurality of internal conductors 18 exist in the dielectric element body 12. Are connected not only by the external electrode 23 via the connection lead portion 18A but also by the external electrode 24 via the connection lead portion 18B, so that each internal conductor 18 is more reliably energized. It becomes like this.
[0059]
In the present embodiment, as in the first to third embodiments, the internal conductor 14 is provided via the internal conductor 14 having a bent portion 14C and having a long flow path for current flow. As the current flows through 18, the equivalent series resistance of the multilayer capacitor 10 increases.
[0060]
Next, a multilayer capacitor according to a fifth embodiment of the present invention will be described with reference to FIG. In addition, the same code | symbol is attached | subjected to the member same as the member demonstrated in 1st Embodiment, and the duplicate description is abbreviate | omitted.
As shown in FIG. 8, in the present embodiment, instead of the internal conductor 14, two internal conductors 31 and 32 are arranged on one ceramic layer 12 </ b> A. The two inner conductors 31 and 32 have a plurality of bent portions 31C and 32C, respectively, and are formed in an elongated and meandering shape.
[0061]
That is, one end of the inner conductor 31 is drawn from the left portion of the inner conductor 31 toward the left end of the ceramic layer 12 </ b> A, so that one end of the inner conductor 31 is a terminal lead portion 31 </ b> A connected to the terminal electrode 21. The other end of the inner conductor 31 is drawn from the inner conductor 31 toward the front end of the ceramic layer 12A, so that the other end of the inner conductor 31 serves as a connection lead portion 31B.
[0062]
Further, one end of the inner conductor 32 is drawn from the right side portion of the inner conductor 32 toward the right end of the ceramic layer 12 </ b> A, so that one end of the inner conductor 32 is a terminal lead portion 32 </ b> A connected to the terminal electrode 22. The other end of the internal conductor 32 is drawn out from the internal conductor 32 toward the back end of the ceramic layer 12A, so that the other end of the internal conductor 32 is used as a connection lead portion 32B.
[0063]
In the dielectric body 12, the internal conductor 18 is disposed below the internal conductor 31 with the ceramic layer 12A therebetween, as in the second embodiment, and further below the internal conductor 18 with the ceramic layer 12A interposed therebetween. The internal conductor 16 is disposed in the case. The inner conductor 18 and the inner conductor 16 have a structure in which a plurality of layers are laminated alternately and repeatedly, as in the second embodiment.
[0064]
However, the connecting lead portion 18A of the inner conductor 18 is slightly shifted to the left side corresponding to the position of the connecting lead portion 31B of the inner conductor 31, and the connecting lead portion 16A of the inner conductor 16 is located. Is slightly shifted to the right side corresponding to the position of the connecting lead portion 32B of the inner conductor 32. Therefore, in the present embodiment, the external electrodes 23 and 24 are arranged with a slight displacement as compared with the first embodiment, or the widths of the external electrodes 23 and 24 are slightly wider. However, the multilayer capacitor 10 according to the present embodiment also increases the equivalent series resistance.
[0065]
Next, a multilayer capacitor according to a sixth embodiment of the present invention will be described with reference to FIG. In addition, the same code | symbol is attached | subjected to the member same as the member demonstrated in 1st Embodiment, and the duplicate description is abbreviate | omitted.
As shown in FIG. 9, in the present embodiment, instead of the inner conductor 14, the inner conductor 33 having a plurality of bent portions 33C and being formed in a meandering manner on the ceramic layer 12A is formed at the top. The structure is arranged.
[0066]
However, compared with the internal conductor 14, the internal conductor 33 differs in the position of the bent portion 33C and the direction of meandering of the conductor. That is, the portion near the terminal lead portion 33A, which is located on the left side of the ceramic layer 12A and forms one end, is formed in a zigzag between the front side and the back side of the ceramic layer 12A. A portion close to the terminal lead portion 33B that constitutes the other end of the ceramic layer 12A is zigzag between the left and right sides of the ceramic layer 12A.
[0067]
Further, in the present embodiment, as in the third embodiment, the internal conductor 18 is disposed below the internal conductor 33 with the ceramic layer 12A therebetween. Further, an internal conductor 17 is disposed below the internal conductor 18 that separates the ceramic layer 12A. Hereinafter, a plurality of these internal conductors 18 and internal conductors 17 are repeatedly stacked.
[0068]
As described above, in the present embodiment, similarly to the first to fifth embodiments, the inner conductor 18 is provided via the inner conductor 33 having the bent portion 33C and having a longer flow path for current flow. As the current flows, the equivalent series resistance of the multilayer capacitor 10 increases.
[0069]
On the other hand, the result of the test for comparing the impedance between the capacitor of the example and the capacitor of the conventional example using an impedance analyzer is shown below. A multilayer capacitor 100 shown in FIG. 12 was used as a conventional capacitor to be compared here. In contrast, the multilayer capacitor 10 of the first embodiment shown in FIG. 2 was used as the capacitor of the example.
[0070]
As shown in FIG. 10 representing the measurement result, the characteristic curve A representing the characteristics of the capacitor of the conventional example has a portion where the impedance is extremely lowered and resonance occurs near the frequency exceeding 1.0 MHz. However, the characteristic curve B representing the characteristics of the multilayer capacitor 10 according to the example does not have such a portion and does not resonate.
[0071]
Moreover, as a result of measuring the equivalent series resistance value of these samples, the equivalent series resistance value of the conventional capacitor was 3.5 mΩ. On the other hand, the equivalent series resistance value of the multilayer capacitor 10 according to the example was 505.2 mΩ. That is, the ESR of the multilayer capacitor 10 according to the example is not only clearly increased as compared with the capacitor of the conventional example, but also has a resistance value of 50 mΩ or more which is considered to be a range in which there is no problem in practical use. That was confirmed.
[0072]
The value of this ESR is the self-resonant frequency f shown in FIG.0Is the value at. Here, in this figure, ESL is an equivalent series inductance, and C is a capacitance. Each capacitor used in the test was 3216 type, the capacitance value of the conventional example was 1.02 μF, and the capacitance value of the example was 1.06 μF. Here, the 3216 type means that the length is 3.2 mm and the width is 1.6 mm.
[0073]
On the other hand, the number of inner conductors is not limited to the number of multilayer capacitors 10 according to the above-described embodiment, and may be a larger number, or the order of the inner conductors in the stacking direction may be arbitrarily changed. Furthermore, the structure of the inner conductor is not limited to that described in the above embodiment.
[0074]
【The invention's effect】
According to the present invention, it is possible to provide a multilayer capacitor applicable to various uses by increasing ESR.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view showing a multilayer capacitor in accordance with a first embodiment of the present invention.
FIG. 2 is a perspective view showing the multilayer capacitor in accordance with the first embodiment of the present invention.
3 is a cross-sectional view showing the multilayer capacitor in accordance with the first embodiment of the present invention, and corresponds to a cross section taken along line 3-3 in FIG.
FIG. 4 is a circuit diagram showing an equivalent circuit of the multilayer capacitor in accordance with the first embodiment of the present invention.
FIG. 5 is an exploded perspective view showing a multilayer capacitor in accordance with a second embodiment of the present invention.
FIG. 6 is an exploded perspective view showing a multilayer capacitor in accordance with a third embodiment of the present invention.
FIG. 7 is an exploded perspective view showing a multilayer capacitor in accordance with a fourth embodiment of the present invention.
FIG. 8 is an exploded perspective view showing a multilayer capacitor in accordance with a fifth embodiment of the present invention.
FIG. 9 is an exploded perspective view showing a multilayer capacitor in accordance with a sixth embodiment of the present invention.
FIG. 10 is a graph showing a comparison of impedance characteristics between a conventional example and an example.
FIG. 11 is a graph showing impedance characteristics of a capacitor.
FIG. 12 is a perspective view showing a conventional multilayer capacitor.
FIG. 13 is an exploded perspective view showing a conventional multilayer capacitor.
FIG. 14 is a circuit diagram showing an equivalent circuit of a conventional multilayer capacitor.
[Explanation of symbols]
10 multilayer capacitors
12 Dielectric body (element body)
12A Ceramic layer (laminate layer, dielectric layer)
14 Inner conductor (first inner conductor, conductor extension)
15 Inner conductor (first inner conductor, conductor extension)
16 Inner conductor (second inner conductor, third inner conductor)
17 Inner conductor (third inner conductor)
18 Inner conductor (second inner conductor)
19 Inner conductor (fourth inner conductor)
21, 22 Terminal electrode
23 External electrode (relay electrode, first connecting electrode)
24 External electrode (connection electrode, second connection electrode)

Claims (6)

  1. An element body formed by laminating laminate layers;
    At least a pair of terminal electrodes arranged outside the element body and respectively connected to an external circuit;
    A first internal conductor disposed in a form having a bent portion in the element body and having one end connected to one of the pair of terminal electrodes;
    A planar second inner conductor that is disposed in the element body while being separated from the first inner conductor by the laminate layer, and one end of which is drawn out to a side surface of the element body;
    A connecting electrode disposed outside the element body and connecting the other end of the first inner conductor and one end of the second inner conductor on the outer side of the element body;
    A third inner conductor disposed in the element body while being separated from the first inner conductor and the second inner conductor by the multilayer body layer, and having one end drawn out from a side surface of the element body and connected to the other terminal electrode; ,
    With
    The first inner conductor has a plurality of bent portions each meandering and is constituted by a plurality of conductor extensions separated from each other by a laminate layer, and the conductor extensions are disposed outside the element body. A multilayer capacitor in which relay electrodes connected in series are arranged outside the element body.
  2.   2. The multilayer capacitor according to claim 1, wherein a plurality of second inner conductors and third inner conductors are alternately laminated in the element body.
  3.   3. The multilayer capacitor according to claim 1, wherein at least the multilayer body layer separating the second internal conductor and the third internal conductor is a dielectric layer. 4.
  4. An element body formed by laminating laminate layers;
    At least a pair of terminal electrodes arranged outside the element body and respectively connected to an external circuit;
    A first internal conductor which is arranged in a meandering manner with a plurality of bent portions in the element body, and one end of which is connected to one of the pair of terminal electrodes;
    A planar second inner conductor that is disposed in the element body while being separated from the first inner conductor by the laminate layer, and one end of which is drawn out to a side surface of the element body;
    A first connecting electrode disposed outside the element body and connecting the other end of the first inner conductor and one end of the second inner conductor on the outer side of the element body;
    A planar third inner conductor disposed in the element body while being separated from the first inner conductor and the second inner conductor by the multilayer body layer, and having one end drawn to the side surface of the element body;
    The first inner conductor is separated from the third inner conductor by the laminated body layer, and the element body is arranged in a meandering manner having a plurality of bent portions, and one end is connected to the other terminal electrode. 4 inner conductors;
    A second electrode disposed at a portion facing the first connection electrode on the outer side of the element body and connecting between one end of the third inner conductor and the other end of the fourth inner conductor on the outer side of the element body; A connecting electrode;
    With
    The first inner conductor and the fourth inner conductor, which are not connected to each other by any connecting electrode but have different polarities, have the same shape as each other, and are not connected to each other by any connecting electrode. The second inner conductor and the third inner conductor having different polarities from each other have the same shape ,
    A multilayer capacitor , wherein the pair of terminal electrodes, the first connection electrode, and the second connection electrode are respectively disposed on different side surfaces of the element body .
  5.   5. The multilayer capacitor according to claim 4, wherein a plurality of second inner conductors and third inner conductors are alternately laminated in the element body.
  6.   6. The multilayer capacitor according to claim 4, wherein the multilayer body layer separating at least the second inner conductor and the third inner conductor is a dielectric layer.
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JP5268276B2 (en) * 2006-05-22 2013-08-21 株式会社村田製作所 Multilayer ceramic capacitor and its mounting structure
JP4293560B2 (en) * 2006-07-12 2009-07-08 Tdk株式会社 Multilayer capacitor array
JP4645637B2 (en) * 2007-11-15 2011-03-09 Tdk株式会社 Multilayer capacitor
KR100916476B1 (en) * 2007-11-30 2009-09-08 삼성전기주식회사 Multilayer Chip Capacitor and Circuit Board Apparatus Having the Capacitor
JP4548492B2 (en) 2008-02-13 2010-09-22 Tdk株式会社 Multilayer capacitor array
JP4475338B2 (en) * 2008-02-14 2010-06-09 Tdk株式会社 Multilayer capacitor
KR100992311B1 (en) * 2008-08-13 2010-11-05 삼성전기주식회사 Multilayer Chip Capacitor and Circuit Board Apparatus Having the Capacitor
JP5077180B2 (en) * 2008-10-10 2012-11-21 Tdk株式会社 Multilayer capacitor
JP5093044B2 (en) * 2008-10-20 2012-12-05 Tdk株式会社 Multilayer capacitor
JP4737301B2 (en) * 2009-01-30 2011-07-27 Tdk株式会社 Multilayer capacitor
KR101053410B1 (en) 2009-07-17 2011-08-01 삼성전기주식회사 Stacked Chip Capacitors
JP5815607B2 (en) * 2013-04-22 2015-11-17 サムソン エレクトロ−メカニックス カンパニーリミテッド. multilayer ceramic capacitor and its mounting board
KR101994713B1 (en) 2013-04-22 2019-07-01 삼성전기주식회사 Multi-layered ceramic capacitor and board for mounting the same
KR101504017B1 (en) * 2013-07-11 2015-03-18 삼성전기주식회사 Multi-layered ceramic capacitor and board for mounting the same
JP5900858B2 (en) * 2013-07-22 2016-04-06 サムソン エレクトロ−メカニックス カンパニーリミテッド. Multilayer ceramic capacitor and manufacturing method thereof

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