JP2006147792A - Multilayer capacitor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an easy-to-manufacture multilayer capacitor in which manufacturing cost can be reduced. <P>SOLUTION: In a multilayer body 2, a first internal electrode layer 20 and a second internal electrode layer 26 are alternately laminated through a dielectric layer 32. The first internal electrode layer 20 has a first internal electrode 22 extending to be led out to the first and second side faces 4 and 6, and a second internal electrode 24 extending to be led out to the third side face 8. The second internal electrode layer 26 has a third internal electrode 28 extending to be led out to the first and second side faces 4 and 6, and a fourth internal electrode 30 extending to be led out to the fourth side face 10. A first capacity component is formed of the second internal electrode 24 and the fourth internal electrode 30. A second capacity component is formed of the first internal electrode 22 and the fourth internal electrode 30. A third capacity component is formed of the second internal electrode 24 and the third internal electrode 28. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a multilayer capacitor.

  This type of multilayer capacitor includes a multilayer body in which dielectric layers and a plurality of internal electrodes are alternately stacked, and a pair of terminal electrodes and a ground electrode formed on the outer surface of the multilayer body. A first capacitance component disposed between the pair of terminal electrodes, and a second capacitance and a third capacitance disposed in parallel with the first capacitance component, connected in series to each other and connected to the ground electrode at a connection point What is formed with a component is known (for example, refer patent document 1).

The multilayer capacitor described in Patent Literature 1 includes first to fourth internal electrodes as a plurality of internal electrodes. The second and third capacitive components are opposed to each other with a pair of first internal electrodes divided into two at the central portion on the same laminated surface and a dielectric layer between the first internal electrodes. The second internal electrode is formed by laminating the second internal electrode that extends continuously. The first capacitive component has a dielectric layer sandwiched between the third internal electrode and the third internal electrode that are continuously opposed to each other with the dielectric layer sandwiched between the second internal electrode and the third internal electrode. Are formed by laminating a fourth internal electrode that continuously spreads and is opposed to each other.
JP 2000-299249 A

  However, since the multilayer capacitor disclosed in Patent Document 1 has a configuration in which each of the first to fourth internal electrodes is laminated via a dielectric layer, in order to form the first to third capacitance components. It is necessary to form four types of internal electrodes of the first to fourth internal electrodes. For this reason, the manufacturing process of the multilayer capacitor becomes complicated, and the manufacturing cost increases.

  An object of the present invention is to provide a multilayer capacitor that is easy to manufacture and can reduce the manufacturing cost.

  The multilayer capacitor according to the present invention includes a multilayer body in which a first internal electrode layer and a second internal electrode layer are alternately stacked with a dielectric layer interposed therebetween, and first and second internal electrode layers. A first terminal electrode located on the first side surface of the multilayer body parallel to the laminating direction, a second terminal electrode located on the second side surface of the laminated body facing the first side surface, and parallel to the laminating direction And a third terminal electrode positioned on the third side surface of the multilayer body extending in a direction intersecting the first and second side surfaces, and a fourth terminal surface positioned on the fourth side surface of the multilayer body facing the third side surface. 4, and the first internal electrode layer extends to be drawn out to the first and second side surfaces and is connected to the first and second terminal electrodes And electrically insulated from the first internal electrode, extended so as to be drawn out to the third side surface, and the third terminal electrode A second internal electrode layer connected to the second internal electrode, wherein the second internal electrode layer extends to be drawn out to the first and second side surfaces and is connected to the first and second terminal electrodes. And a fourth internal electrode that is electrically insulated from the third internal electrode, extends so as to be drawn out to the fourth side surface, and is connected to the fourth terminal electrode. A first capacitance component is formed by the internal electrode and the fourth internal electrode, and a second capacitance component is formed by the first internal electrode and the fourth internal electrode, and the second internal electrode and the second internal electrode A third capacitance component is formed by the three internal electrodes.

  In the multilayer capacitor according to the present invention, the first to third capacitance components are formed by laminating the first internal electrode layer and the second internal electrode layer with a dielectric layer interposed therebetween. It becomes. Therefore, in order to form the first to third capacitance components, two types of internal electrode layers, the first and second internal electrode layers, may be formed. For this reason, a multilayer capacitor having three capacitance components can be easily manufactured, and the manufacturing cost can be reduced.

  In addition, both end portions of the first and third internal electrodes in the facing direction between the first side surface and the second side surface are opposed to the first and second side surfaces in the first and third internal electrodes. It is preferable that the width in the direction orthogonal to the stacking direction and the facing direction is set wider than that in the middle part. By setting in this way, the electrical connection between the first and third internal electrodes and the first and second terminal electrodes can be reliably performed.

  According to the present invention, it is possible to provide a multilayer capacitor that is easy to manufacture and can reduce manufacturing costs.

    Hereinafter, preferred embodiments of a multilayer capacitor according to the present invention will be described in detail with reference to the accompanying drawings. In the description, the same reference numerals are used for the same elements or elements having the same function, and redundant description is omitted.

  First, the configuration of the multilayer capacitor 1 according to the embodiment will be described with reference to FIGS. FIG. 1 is a perspective view of the multilayer capacitor according to the embodiment. FIG. 2 is an exploded perspective view showing a multilayer body included in the multilayer capacitor multilayer body according to the embodiment, in which a part of the multilayer body is exploded. FIG. 3 is a plan view showing a state in which the first internal electrode layer and the second internal electrode layer included in the multilayer capacitor according to the present embodiment are overlaid. FIG. 4 is an equivalent circuit diagram of the multilayer capacitor according to the embodiment. In order to make the internal electrodes easier to see, the regions corresponding to the internal electrodes are hatched in FIGS.

  As shown in FIG. 1, the multilayer capacitor 1 includes a rectangular parallelepiped multilayer body 2 and first to fourth terminal electrodes 12, 14, 16, and 18. As shown in FIG. 2, the multilayer body 2 is configured by alternately laminating the first internal electrode layers 20 and the second internal electrode layers 26 with the dielectric layers 32 interposed therebetween. The actual multilayer capacitor 1 is integrated so that the boundary between the dielectric layers 32 is not visible.

  As shown in FIG. 1, the stacked body 2 includes a first side surface 4, a second side surface 6, a third side surface 8, a fourth side surface 10, a fifth side surface 11 a, and a sixth side surface. Side surface 11b. The first side surface 4 and the second side surface 6 are positioned so as to face each other when viewed in the X-axis direction. The third side surface 8 and the fourth side surface 10 are positioned so as to face each other when viewed in the Y-axis direction. Therefore, the third side surface 8 and the fourth side surface 10 extend in a direction intersecting with the first and second side surfaces 4 and 6, respectively. The fifth side surface 11a and the sixth side surface 11b are positioned so as to face each other when viewed in the Z-axis direction.

  As shown in FIG. 2, the first to fourth side surfaces 4, 6, 8, and 10 are all in the Z-axis direction, that is, the stacking direction of the first internal electrode layer 20 and the second internal electrode layer 26. (Hereinafter simply referred to as “stacking direction”).

  The first terminal electrode 12 is located on the first side surface 4 of the multilayer body 2. The first terminal electrode 12 is formed so as to cover the first side face 4 and partially wrap around the third to sixth side faces 8, 10, 11a, 11b. The second terminal electrode 14 is located on the second side surface 6 of the multilayer body 2. The second terminal electrode 14 is formed so as to cover the second side face 6 and partially wrap around the third to sixth side faces 8, 10, 11a, 11b.

  The third terminal electrode 16 is located on the third side surface 8 of the multilayer body 2. The third terminal electrode 16 covers the center portion of the third side surface 8 in the X-axis direction, that is, the opposing direction of the first side surface 4 and the second side surface 6, and a part thereof is the fifth and sixth portions. It is formed so as to wrap around the side surfaces 11a and 11b. The fourth terminal electrode 18 is located on the fourth side surface 10 of the multilayer body 2. The fourth terminal electrode 18 covers the central portion of the fourth side surface 10 in the X-axis direction and the opposing direction of the first side surface 4 and the second side surface 6, and a part thereof is the fifth and sixth side surfaces. It is formed so as to wrap around 11a and 11b.

  The first and second terminal electrodes 12 and 14 and the third and fourth terminal electrodes 16 and 18 have a predetermined interval and are electrically insulated. The first terminal electrode 12 and the second terminal electrode 14 have a predetermined interval and are electrically insulated. The third terminal electrode 16 and the fourth terminal electrode 18 have a predetermined interval and are electrically insulated.

  As shown in FIG. 2, the first internal electrode layer 20 includes a first internal electrode 22 and a second internal electrode 24. The first internal electrode 22 and the second internal electrode 24 are located in the same layer while being electrically insulated from each other. The first internal electrode 22 is connected to the first terminal electrode 12 and the second terminal electrode 14. The second internal electrode 24 is connected to the third terminal electrode 16.

  The first internal electrode 22 extends in the opposing direction of the first side face 4 and the second side face 6 so as to be drawn out to the first side face 4 and the second side face 6. The first internal electrode 22 has a first electrode portion 22a and a second electrode portion 22b. The first electrode portion 22 a corresponds to a midway portion in the opposing direction of the first side surface 4 and the second side surface 6 in the first internal electrode 22. The second electrode portion 22 b corresponds to both end portions in the opposing direction of the first side surface 4 and the second side surface 6 in the first internal electrode 22.

  The first electrode portion 22 a has a predetermined distance from the fourth side surface 10 and extends in the opposing direction of the first side surface 4 and the second side surface 6 along the fourth side surface 10. . The second electrode portion 22b extends in the Y-axis direction, that is, the third side surface 8 and the second side surface along the first and second side surfaces 4 and 6 so as to face the first and second side surfaces 4 and 6, respectively. 4 extends in a direction opposite to the side surface 10. The second electrode portion 22b is, as compared with the first electrode portion 22a, a direction perpendicular to the stacking direction and the opposing direction of the first side surface 4 and the second side surface 6 (third side surface 8 and fourth side The width in the direction facing the side surface 10) is set wide. The second electrode portion 22 b is connected to the first and second terminal electrodes 12 and 14.

  The second internal electrode 24 extends so as to be drawn out to the third side surface 8. The second internal electrode 24 has a first electrode portion 24a and a second electrode portion 24b. The first electrode portion 24 a is located in a region surrounded by the first internal electrode 22 and has a rectangular shape. The second electrode portion 24 b faces the third side surface 8 toward the central portion of the third side surface 8 in the facing direction of the first side surface 4 and the second side surface 6. Extending from portion 24a. The second electrode portion 24 b is connected to the third terminal electrode 16.

  As shown in FIG. 2, the second internal electrode layer 26 includes a third internal electrode 28 and a fourth internal electrode 30. The third internal electrode 28 and the fourth internal electrode 30 are located in the same layer while being electrically insulated from each other. The third internal electrode 28 is connected to the first terminal electrode 12 and the second terminal electrode 14. The fourth internal electrode 30 is connected to the fourth terminal electrode 18.

  The third internal electrode 28 extends in the opposing direction of the first side face 4 and the second side face 6 so as to be drawn out to the first side face 4 and the second side face 6. The third internal electrode 28 has a first electrode portion 28a and a second electrode portion 28b. The first electrode portion 28 a corresponds to a middle portion of the third internal electrode 28 in the facing direction between the first side surface 4 and the second side surface 6. The second electrode portion 28 b corresponds to both end portions in the facing direction of the first side surface 4 and the second side surface 6 in the third internal electrode 28.

  The first electrode portion 28 a has a predetermined distance from the third side surface 8 and extends in the opposing direction of the first side surface 4 and the second side surface 6 along the third side surface 8. . The second electrode portion 28b extends in the Y-axis direction, that is, the third side surface 8 and the second side surface along the first and second side surfaces 4 and 6 so as to face the first and second side surfaces 4 and 6, respectively. 4 extends in a direction opposite to the side surface 10. The second electrode portion 28b is, as compared with the first electrode portion 28a, a direction perpendicular to the stacking direction and the opposing direction of the first side surface 4 and the second side surface 6 (third side surface 8 and fourth side The width in the direction facing the side surface 10) is set wide. The second electrode portion 28 b is connected to the first and second terminal electrodes 12 and 14.

  The fourth internal electrode 30 extends so as to be drawn out to the fourth side surface 10. The fourth internal electrode 30 has a first electrode portion 30a and a second electrode portion 30b. The first electrode portion 30 a is located in a region surrounded by the third internal electrode 28 and has a rectangular shape. The second electrode portion 30b faces the fourth side surface 10 so that the first electrode faces the central portion of the fourth side surface 10 in the facing direction of the first side surface 4 and the second side surface 6. Extending from portion 30a. The second electrode portion 30 b is connected to the fourth terminal electrode 18.

In the stacked body 2, as described above, the first internal electrode layers 20 and the second internal electrode layers 26 are alternately stacked via the dielectric layers 32. In the stacked body 2, the first to third capacitive components C ₁ , C ₂ , and C ₃ shown in FIG. 4 are formed by stacking the first internal electrode layer 20 and the second internal electrode layer 26. The Rukoto.

By superimposing the first internal electrode layer 20 and the second internal electrode layer 26, as shown in FIG. 3, the second internal electrode 24 (first electrode portion 24a) and the fourth internal electrode are formed. 30 (first electrode portion 30a) has a portion that overlaps each other when viewed in the stacking direction. The overlapping portion of the second internal electrode 24 and the fourth internal electrode 30 forms the _first capacitance component C ₁ of the multilayer capacitor 1. As shown in FIG. 4, the first capacitance component C ₁ is connected in series between the third terminal electrode 16 and the fourth terminal electrode 18.

By superimposing the first internal electrode layer 20 and the second internal electrode layer 26, as shown in FIG. 3, the first internal electrode 22 (first electrode portion 22a) and the fourth internal electrode are formed. 30 (first electrode portion 30a) has a portion that overlaps each other when viewed in the stacking direction. The overlapping portion of the first internal electrode 22 and the fourth internal electrode 30 forms the first capacitance component C ₂ of the multilayer capacitor 1. As shown in FIG. 4, the second capacitance component C < _b > ₂ is connected in series between the first terminal electrode 12 and the fourth terminal electrode 18.

By superimposing the first internal electrode layer 20 and the second internal electrode layer 26, as shown in FIG. 3, the second internal electrode 24 (first electrode portion 24a) and the third internal electrode 28 (first electrode portion 28a) has a portion overlapping each other when viewed in the stacking direction. The overlapping portion of the second internal electrode 24 and the third internal electrode 28 forms the first capacitance component C ₃ of the multilayer capacitor 1. Third capacitance component C _3, as shown in FIG. 4, is connected in series between the second terminal electrodes 14 and the third terminal electrode 16.

  Next, a manufacturing method of the multilayer capacitor 1 having the above-described configuration will be described.

  First, an organic binder and an organic solvent are added to a powdery dielectric ceramic material to obtain a slurry. Then, a dielectric ceramic green sheet is produced from this slurry by a known method such as a doctor blade method.

  Next, a plurality of conductor patterns constituting the first internal electrode layer 20 (the first internal electrode 22 and the second internal electrode 24) are provided on the desired dielectric ceramic green sheet (corresponding to the number of divided chips described later). Number) to form. Further, the second internal electrode layer 26 (the third internal electrode 28 and the fourth internal electrode 28) is formed on a dielectric ceramic green sheet different from the dielectric ceramic green sheet on which the conductor pattern constituting the first internal electrode layer 20 is formed. A plurality of conductor patterns (a number corresponding to the number of divided chips described later) are formed. Each conductor pattern is formed, for example, by screen-printing a conductor paste mainly composed of Ni and then drying.

  Next, a dielectric ceramic green sheet formed to form the first internal electrode layer 20, a dielectric ceramic green sheet formed to form the second internal electrode layer 26, and a conductor pattern are formed. The dielectric ceramic green sheets not yet formed are laminated and pressure-bonded in the order of lamination as shown in FIG. 2 to obtain an intermediate laminated body composed of a plurality of dielectric ceramic green sheets. Then, after the obtained laminated intermediate is cut into chips, the organic binder is removed (debide) and fired. Thereby, the laminated body 2 by which the 1st and 2nd internal electrode layers 20 and 26 were laminated | stacked alternately inside is obtained.

  Next, the first to fourth terminal electrodes 12, 14, 16, and 18 are formed on the obtained laminate 2. The terminal electrodes 12, 14, 16, and 18 are formed by, for example, applying a terminal electrode paste mainly containing Cu to the opposing side surfaces, and then subjecting this paste to a heating (baking) process. Then, an Ni plating layer and an Sn plating layer are sequentially laminated on the outer surface of each terminal electrode 12, 14, 16, 18 by electrolytic plating or the like. In this way, the multilayer capacitor 1 is obtained.

As described above, according to this embodiment, the first internal electrode layer 20 and the second internal electrode layer 26 are stacked with the dielectric layer 32 interposed therebetween, so that the first to third capacitors are formed. Components C ₁ , C ₂ and C ₃ will be formed. Therefore, in order to form the _first to third capacitance components C ₁ , C ₂ , and C ₃ , two types of internal electrode layers, the first and second internal electrode layers 20 and 26, may be formed. Therefore, the multilayer capacitor 1 having the _three capacitance components C ₁ , C ₂ , and C ₃ can be easily manufactured, and the manufacturing cost can be reduced.

  In the present embodiment, the second electrode portions 22b and 28b of the first and third internal electrodes 22 and 28 are replaced with the first electrode portions 22a and 28a of the first and third internal electrodes 22 and 28, respectively. In comparison, the width in the stacking direction and the direction orthogonal to the opposing direction of the first side surface 4 and the second side surface 6 is set wider. As a result, the lengths of the second electrode portions 22b and 28b in the opposing direction of the third side surface 8 and the fourth side surface 10 are increased, and the first and third inner electrodes 22 and 28 and the first and Electrical connection with the second terminal electrodes 12 and 14 can be reliably performed.

  Next, a circuit configuration when the multilayer capacitor 1 according to the present embodiment is used as a DC line noise filter will be described with reference to FIG. FIG. 5 is an equivalent circuit diagram when the multilayer capacitor according to the embodiment is used as a noise filter of a DC line.

  The multilayer capacitor 1 is provided between the negative power supply line A and the positive power supply line B. The first and second terminal electrodes 14 and 16 are connected to the ground potential. The third terminal electrode 16 is connected to the negative power supply line A, and the fourth terminal electrode 18 is connected to the positive power supply line B.

In the DC line, intrusion of common mode noise and differential noise becomes a problem. In the case of using the multilayer capacitor 1 as a noise filter, differential noise in the first capacitive component C ₁ is absorbed, common mode noise is absorbed by the second and third capacitive component C _2, C _3. Therefore, when the multilayer capacitor 1 is mounted on an electronic device as a noise filter, the mounting area of the noise filter in the electronic device is further reduced as compared with the conventional case where three capacitors are mounted to remove these noises. I can.

  The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited to the above-described embodiments, and various modifications are possible. In the present embodiment, the laminated body 1 is a laminated body whose longitudinal direction is the facing direction of the first side face 4 and the second side face 6, but is not limited thereto. For example, as illustrated in FIG. 6, the stacked body 1 may be a stacked body in which the opposing direction of the third side surface 8 and the fourth side surface 10 is the longitudinal direction.

The shape and area of the first to fourth internal electrodes 22, 24, 28, ₃₀ are appropriately set according to the capacity required for the _first to third capacitance components C ₁ , C ₂ , C _3. Can do. Therefore, the shape of the first to fourth internal electrodes 22, 24, 28, 30 is not limited to the shape in the above-described embodiment. For example, as shown in FIG. 7, the first to fourth internal electrodes 22, 24, 28, 30 have a rectangular shape extending in the opposing direction between the first side surface 4 and the second side surface 6. Also good. Further, as shown in FIG. 8, the widths of the second electrode portions 22b and 28b in the facing direction of the first side face 4 and the second side face 6 are the second positions located on the first side face 4 side. The electrode portions 22b and 28b may be different from the second electrode portions 22b and 28b located on the second side face 6.

  Further, as shown in FIG. 9, predetermined positions of the first electrode portions 22 a and 28 a of the first and third internal electrodes 22 and 28 (for example, between the first side surface 4 and the second side surface 6 You may form a wide area | region in the opposing direction of the 3rd side surface 8 and the 4th side surface 10 in the center in an opposing direction. The first electrode portions 24a and 30a of the second and fourth inner electrodes 24 and 30 correspond to the wide regions of the first electrode portions 22a and 28a of the first and third inner electrodes 22 and 28, respectively. A narrow region may be formed in the facing direction between the third side surface 8 and the fourth side surface 10. In addition, in order to make an internal electrode easy to see, the area | region equivalent to an internal electrode is attached | subjected hatching in FIGS.

  The first terminal electrode 12 and the second terminal electrode 14 may be integrally formed and electrically connected.

1 is a perspective view of a multilayer capacitor according to an embodiment. 1 is an exploded perspective view showing a multilayer body included in a multilayer capacitor according to an embodiment. FIG. 3 is a plan view of a state in which a first internal electrode layer and a second internal electrode layer included in the multilayer capacitor in accordance with the present embodiment are overlaid. It is an equivalent circuit diagram of the multilayer capacitor of the present embodiment. It is an equivalent circuit diagram when the multilayer capacitor according to the embodiment is used as a noise filter for a DC line. It is a figure which shows the laminated body contained in the modification of the multilayer capacitor | condenser which concerns on this embodiment. It is a figure which shows the laminated body contained in the modification of the multilayer capacitor | condenser which concerns on this embodiment. It is a figure which shows the laminated body contained in the modification of the multilayer capacitor | condenser which concerns on this embodiment. It is a figure which shows the laminated body contained in the modification of the multilayer capacitor | condenser which concerns on this embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Multilayer capacitor, 2 ... Laminated body, 4 ... 1st side surface, 6 ... 2nd side surface, 8 ... 3rd side surface, 10 ... 4th side surface, 12 ... 1st terminal electrode, 14 ... 1st 2 terminal electrodes, 16 ... third terminal electrode, 18 ... fourth terminal electrode, 20 ... first internal electrode layer, 22 ... first internal electrode, 24 ... second internal electrode, 26 ... second Internal electrode layer, 28 ... third internal electrode, 30 ... fourth internal electrode, 32 ... dielectric layer, C ₁ ... first capacitance component, C ₂ ... second capacitance component, C ₃ ... third Capacity component

Claims (2)

A laminated body in which the first internal electrode layers and the second internal electrode layers are alternately laminated with a dielectric layer interposed therebetween;
A first terminal electrode located on a first side surface of the multilayer body parallel to the stacking direction of the first and second internal electrode layers;
A second terminal electrode located on the second side surface of the laminate facing the first side surface;
A third terminal electrode located on a third side surface of the multilayer body extending in a direction parallel to the lamination direction and intersecting the first and second side surfaces;
A fourth terminal electrode located on the fourth side surface of the laminate facing the third side surface,
The first internal electrode layer includes:
A first internal electrode extending to be drawn out to the first and second side surfaces and connected to the first and second terminal electrodes;
A second internal electrode that is electrically insulated from the first internal electrode, extends so as to be drawn out to the third side surface, and is connected to the third terminal electrode;
The second internal electrode layer is
A third internal electrode extending to be drawn to the first and second side surfaces and connected to the first and second terminal electrodes;
A fourth internal electrode that is electrically insulated from the third internal electrode, extends so as to be drawn to the fourth side surface, and is connected to the fourth terminal electrode;
A first capacitance component is formed by the second internal electrode and the fourth internal electrode,
A second capacitance component is formed by the first internal electrode and the fourth internal electrode,
A multilayer capacitor in which a third capacitance component is formed by the second internal electrode and the third internal electrode.   Both end portions of the first and third internal electrodes in the opposing direction of the first side surface and the second side surface are the first and second side surfaces of the first and third internal electrodes, respectively. 2. The multilayer capacitor according to claim 1, wherein a width of the stacking direction and a direction orthogonal to the facing direction is set wider than a midway portion in the facing direction.

Images