Multilayer Ceramic Capacitor

Abstract

To provide a multilayer ceramic capacitor having a reduced ESL value.SOLUTION: According to an embodiment of the present invention, a multilayer ceramic capacitor can be provided. The multilayer ceramic capacitor includes: a body which includes a dielectric layer and first and second internal electrodes disposed with the dielectric layer interposed therebetween, and which has a first surface and a second surface opposing each other in a third direction, a third surface and a fourth surface opposing each other in a second direction, and a fifth surface and a sixth surface opposing each other in a first direction; first and second connection electrodes penetrating the body in a direction perpendicular to the dielectric layer and connected to the first internal electrode; third and fourth connection electrodes penetrating the body in the direction perpendicular to the dielectric layer and connected to the second internal electrode; first and second external electrodes disposed on both surfaces of the body, and connected to the first and second connection electrodes; and third and fourth external electrodes spaced apart from the first and second external electrodes, and connected to the third and fourth connection electrodes. At least a portion of the first and second connection electrodes is exposed to the first surface or the second surface of the body.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a multilayer ceramic capacitor. [Background technology]

[0002] Recently, the use of electronic devices using MLCCs (Multi-Layer Ceramic Capacitors) has been increasing rapidly. In particular, in the case of smartphones, the number of capacitors has increased with the arrival of the 5G era, making higher capacitance necessary. Meanwhile, in terms of technology, the mounting area of ​​passive elements such as MLCCs and inductors has decreased due to the miniaturization of set products, which has led to a demand for smaller and thinner passive elements. Therefore, methods have been proposed to increase the flexibility of mounting by packaging multilayer ceramic capacitors and inductors with ICs and APs, embedding them inside the board, or mounting them as an LSC type at the bottom of the AP.

[0003] In the above cases, the mounting area is not only reduced, but the ESL generated within the board is also greatly reduced, so the demand for thin multilayer ceramic capacitor products is currently on the rise.

[0004] Among them, via type capacitors are different from general MLCCs in that they use a through hole structure, in which a through hole is formed in a body having cover layers on the top and bottom and an active layer that forms capacitance inside, and then a via electrode is filled to provide an electrical connection.

[0005] Such via type capacitors have problems such as the presence of vias affecting the ESL and ESR of the capacitor, as well as reducing the capacitance, etc. Also, when the spacing between vias is narrow, there is a problem that short circuits are likely to occur. Summary of the Invention [Problem to be solved by the invention]

[0006] An object of the present invention is to provide a multilayer ceramic capacitor having a low ESL value.

[0007] Another object of the present invention is to provide a multilayer ceramic capacitor with excellent mountability.

[0008] It is still another object of the present invention to provide a multilayer ceramic capacitor capable of suppressing the occurrence of short circuits during mounting. [Means for solving the problem]

[0009] According to an embodiment of the present invention, there may be provided a multilayer ceramic capacitor including: a dielectric layer; and first and second internal electrodes disposed with the dielectric layer therebetween, the body including first and second sides facing a third direction, third and fourth sides facing the second direction, and fifth and sixth sides facing the first direction; first and second connecting electrodes penetrating the body in a direction perpendicular to the dielectric layer and connected to the first internal electrodes; third and fourth connecting electrodes penetrating the body in a direction perpendicular to the dielectric layer and connected to the second internal electrodes; first and second external electrodes disposed on both sides of the body and connected to the first and second connecting electrodes; and third and fourth external electrodes spaced apart from the first and second external electrodes and connected to the third and fourth connecting electrodes, wherein at least a portion of the first and second connecting electrodes are exposed to a first or second side of the body. Effect of the Invention

[0010] According to an embodiment of the present invention, a multilayer ceramic capacitor having a low equivalent series inductance (ESL) can be provided by using a connection electrode penetrating a body.

[0011] According to another embodiment of the present invention, a multilayer ceramic capacitor capable of preventing a short circuit from occurring during mounting can be provided.

[0012] According to still another embodiment of the present invention, it is possible to provide a multilayer ceramic capacitor that is thin (low-profile) and has excellent mountability.

[0013] However, the various yet significant advantages and effects of the present invention are not limited to the above, and can be more easily understood in the course of describing specific embodiments of the present invention. [Brief description of the drawings]

[0014] [Figure 1] 1 is a perspective view illustrating a multilayer ceramic capacitor according to an embodiment of the present invention; [Figure 2a] 2 is a cross-sectional view taken along line II' in FIG. [Figure 2b] 2 is a cross-sectional view taken along line II' in FIG. [Diagram 3] 2 is a plan view of the multilayer ceramic capacitor shown in FIG. 1, as viewed from a direction S1. [Figure 4] 1 is a perspective view illustrating a multilayer ceramic capacitor according to another embodiment of the present invention; [Diagram 5] 5 is a plan view of the multilayer ceramic capacitor shown in FIG. 4, viewed from the S1 direction. [Figure 6a] 5 is a cross-sectional view taken along the X and Y directions in FIG. 4, showing a cross section of a first internal electrode. [Figure 6b] 5 is a cross-sectional view taken along the X and Y directions in FIG. 4, showing a cross section of a second internal electrode. FIG. [Figure 7a] 5 is a cross-sectional view taken along the X and Y directions of FIG. 4, showing a multilayer ceramic capacitor according to still another embodiment of the present invention, in which a cross section of a first internal electrode is observed. [Figure 7b] 5 is a cross-sectional view taken along the X and Y directions of FIG. 4, showing a multilayer ceramic capacitor according to still another embodiment of the present invention, in which a cross section of a second internal electrode is observed. [Figure 8] 11 is a perspective view illustrating a multilayer ceramic capacitor according to another embodiment of the present invention; FIG. [Figure 9] 11 is a perspective view illustrating a multilayer ceramic capacitor according to another embodiment of the present invention; FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. However, the embodiments of the present invention can be modified into various other forms, and the scope of the present invention is not limited to the embodiments described below. Furthermore, the embodiments of the present invention are provided to more completely explain the present invention to those having average knowledge in the art. Therefore, the shapes and sizes of elements in the drawings may be enlarged or reduced (or highlighted or simplified) for clearer explanation, and elements indicated by the same reference numerals in the drawings are the same elements.

[0016] In order to clearly explain the present invention, parts not relevant to the description are omitted in the drawings, thicknesses are enlarged to clearly show multiple layers and regions, and components having the same function within the same concept are described using the same reference numerals. Furthermore, throughout the specification, when a part "includes" a certain component, it does not mean that other components are excluded, but that the part may further include other components, unless otherwise specified.

[0017] In the drawings, the X direction can be defined as the first direction, L direction, or length direction, the Y direction can be defined as the second direction, W direction, or width direction, and the Z direction can be defined as the third direction, T direction, or thickness direction.

[0018] Hereinafter, a multilayer ceramic capacitor according to an embodiment of the present invention will be described in detail with reference to FIGS.

[0019] The multilayer ceramic capacitor 100 according to an embodiment of the present invention includes a body 110 including a dielectric layer 111 and first and second internal electrodes 121 and 122 sandwiching the dielectric layer 111 therebetween, the body 110 including first and second surfaces S1 and S2 facing in a third direction (Z direction), third and fourth surfaces S3 and S4 facing in a second direction (Y direction), and fifth and sixth surfaces S5 and S6 facing in a first direction (X direction). The dielectric layer 111 may include first and second connecting electrodes 131, 134, third and fourth connecting electrodes 132, 133 penetrating the body 110 in a direction perpendicular to the dielectric layer 111 and connected to the second internal electrode 122, first and second external electrodes 141, 144 arranged on both sides of the body 110 and connected to the first and second connecting electrodes 131, 134, and third and fourth external electrodes 142, 143 spaced apart from the first and second external electrodes 141, 144 and connected to the third and fourth connecting electrodes 132, 133.

[0020] In this case, at least a part of the first and second connecting electrodes may be exposed on the first or second surface of the main body. In this specification, "a part" of the connecting electrode is exposed may mean that the connecting electrode can be seen with the naked eye from the outside, and may mean that the area or width of the part not connected to the external electrode exceeds 0. The above structure may mean that a part of the connecting electrode is exposed and the remaining part is connected to the external electrode. The "part" may be a value converted based on length or area, and when based on length, it may mean that the ratio of the length of the exposed part to the diameter of the connecting electrode is within a range of 0.1 to 0.9. When based on area, it may mean that the ratio of the area of ​​the exposed part to the area of ​​the cross section of the connecting electrode is within a range of 1% to 99%.

[0021] The body 110 may be formed by alternately stacking dielectric layers 111 and internal electrodes 121 and 122. There is no particular limitation on the specific shape of the body 110, but as shown in the figure, the body 110 may have a hexahedral shape or a shape similar thereto. The body 110 may have a substantially hexahedral shape, but not a perfectly linear hexahedral shape, due to shrinkage of the ceramic powder contained in the body 110 during the firing process.

[0022] The body 110 may have a first surface S1 and a second surface S2 facing each other in a thickness direction (Z direction), a third surface S3 and a fourth surface S4 connected to the first surface S1 and the second surface S2 and facing each other in a width direction (Y direction), and a fifth surface S5 and a sixth surface S6 connected to the first surface S1 and the second surface S2 and connected to the third surface S3 and the fourth surface S4 and facing each other in a length direction (X direction). In this case, one surface selected from the first surface, the second surface, the third surface, and the fourth surface S1, S2, S3, and S4 may be a mounting surface.

[0023] The multiple dielectric layers 111 forming the body 110 are in a fired state, and the boundaries between adjacent dielectric layers can be integrated to such an extent that they are difficult to see without the use of a scanning electron microscope (SEM).

[0024] According to an embodiment of the present invention, the raw material for forming the dielectric layer 111 is not particularly limited as long as a sufficient capacitance can be obtained. For example, a barium titanate-based material, a lead complex perovskite-based material, or a strontium titanate-based material can be used. The barium titanate-based material is BaTiO 3 The ceramic powder may include, for example, BaTiO 3 Ca (calcium), Zr (zirconium), etc. are partially dissolved in the solid solution (Ba 1-x Ca x )TiO 3 , Ba(Ti 1-y Ca y )O 3 , (Ba1-x Ca x )(Ti 1-y Zr y )O 3 or Ba(Ti 1-y Zr y )O 3 The material for forming the dielectric layer 111 is barium titanate (BaTiO 3 ) and the like, various ceramic additives, organic solvents, plasticizers, binders, dispersants, etc. can be added depending on the purpose of the present invention.

[0025] First and second cover parts 112 and 113 having a predetermined thickness may be formed on the lower part of the lowermost internal electrode and on the uppermost internal electrode of the body 110. In this case, the first and second cover parts 112 and 113 may be made of the same composition as the dielectric layer 111, and may be formed by laminating at least one dielectric layer not including an internal electrode on the uppermost internal electrode of the body 110 and on the lower part of the lowermost internal electrode, respectively.

[0026] In one embodiment of the present invention, the thickness of the body 110 may be 100 μm or less. The thickness of the body 110 may be the vertical distance between the first surface and the second surface, and the lower limit is not particularly limited, but may be, for example, 5 μm or more. By manufacturing the body 110 to have a thickness of 100 μm or less, it can be applied to a multilayer ceramic capacitor for embedding in a substrate and / or a capacitor that can be mounted in an LSC type at the lower end of an AP.

[0027] The internal electrodes may include first and second internal electrodes 121, 122 that are alternately arranged to face each other with a dielectric layer interposed therebetween. In this case, the first and second internal electrodes 121, 122 may include electrode-free regions 121a, 122a, respectively. The electrode-free regions 121a, 122a refer to regions where the first and second internal electrodes 121, 122 are not formed, respectively, and may serve to allow the first and second internal electrodes 121, 122 to be connected only to external electrodes of different polarities. That is, the first and second connecting electrodes 131, 134 penetrate the electrode-free region 121a and are spaced apart from the second internal electrode 122, and the third and fourth connecting electrodes 132, 133 penetrate the electrode-free region 122a and are spaced apart from the first internal electrode 121.

[0028] The first and second internal electrodes 121, 122 are connected to the first to fourth external electrodes 141, 142, 143, 144 by the first to fourth connecting electrodes 131, 132, 133, 134, respectively, so that the overlapping area of ​​the first and second internal electrodes 121, 122 with the dielectric layer 111 sandwiched therebetween can be maximized. This makes it possible to significantly increase the capacitance of the multilayer ceramic capacitor 100. In addition, it is possible to reduce current loops and achieve low ESL.

[0029] 6a and 6b are cross-sectional views showing the shapes of the first internal electrode 321 and the second internal electrode 322. Referring to FIG. 6a and FIG. 6b, the first internal electrode 321 and the second internal electrode 322 may have shapes that are point-symmetric to each other. The internal electrodes 321 and 322 being point-symmetric may mean that the first internal electrode 321 and the second internal electrode 322 are symmetric to each other with respect to the center point of the internal electrodes 321 and 322 when an imaginary line is drawn assuming that an electrode exists in the electrode-free region of the internal electrodes 321 and 322. As a result of the first internal electrode 321 and the second internal electrode 322 having point-symmetric shapes, a mutual inductance cancellation effect occurs, and the equivalent series inductance (ESL) of the multilayer ceramic capacitor can be improved.

[0030] In an embodiment of the present invention, the first internal electrode 321 and the second internal electrode 322 may have a T-shape. Referring to Figures 6a and 6b, the first and second internal electrodes 321 and 322 of the present invention may have a shape having a long side in the length direction and a short side in the width direction, so the shape in Figures 6a and 6b may refer to a T-shape.

[0031] In this way, since the internal electrodes 321, 322 have a T-shape, electrode-free regions 321a, 322a of the internal electrodes 321, 322 can be generated. This allows the electrode-free regions 321a, 322a to be disposed outside the internal electrodes 321, 322, and realizes a structure in which the connecting electrodes 331, 332, 333, 334 penetrate toward the electrode-free regions 321a, 322a. With this structure, the capacitance of the capacitor can be increased compared to a structure in which via holes are formed on the internal electrodes.

[0032] In one example, the electrode-free regions 321a, 322a of the internal electrodes 321, 322 may have a rectangular shape. Referring to Figures 6a and 6b, it can be seen that the electrode-free regions 321a, 322a have a rectangular shape toward the center of the internal electrodes.

[0033] In another example, the electrode-free regions 421a, 422a of the internal electrodes may have a rounded shape. Referring to Figures 7a and 7b, it can be seen that the electrode-free regions 421a, 422a have a rounded shape toward the center of the internal electrodes.

[0034] In the above, the case where the undisposed area of ​​the internal electrode has a rectangular shape and a round shape has been described as an example, but this is merely an example, and the shape of the internal electrode pattern of the present invention is not limited to this, and various shapes such as a triangular shape and a polygonal shape also fall within the scope of the present invention.

[0035] The first and second internal electrodes 121 and 122 may contain nickel (Ni) in the largest amount, but are not limited thereto, and may be formed using a conductive paste containing at least one of silver (Ag), palladium (Pd), gold (Au), platinum (Pt), nickel (Ni), tin (Sn), copper (Cu), tungsten (W), titanium (Ti), and alloys thereof. The conductive paste may be printed by a screen printing method or a gravure printing method, but the present invention is not limited thereto.

[0036] In an embodiment of the present invention, at least a portion of the first and second connecting electrodes may be exposed to a first or second surface of the body. Fig. 3 is a plan view of a multilayer ceramic capacitor according to an embodiment of the present invention. Referring to Fig. 3, at least a portion of the first or second connecting electrodes may be exposed to a first or second surface of the body.

[0037] In one modification of the above embodiment, a part of the first connecting electrode and a part of the second connecting electrode may be arranged to be exposed on the first surface or the second surface of the main body. In this case, as shown in Fig. 3, the connecting electrode that contacts the external electrode on one side of the first surface S1 of the main body may be arranged so that a part of its cross section is exposed to one surface of the main body, and the connecting electrode that contacts the external electrode on the other side may be arranged so that the entire cross section is in contact with the external electrode. In addition, in the above modification, the exposed connecting electrode may not be arranged on the second surface S2 of the main body.

[0038] In another modification of the above embodiment, the first connecting electrode or the second connecting electrode may be disposed such that a portion of the first connecting electrode or the second connecting electrode is exposed to the first and second surfaces of the body. In this case, any one of the first connecting electrode and the second connecting electrode may be exposed to both the first and second surfaces of the body, and a portion of the connecting electrode may be exposed to both the first and second surfaces of the body.

[0039] In yet another modification of the above embodiment, a portion of the first connecting electrode and a portion of the second connecting electrode may be exposed to the first and second surfaces of the main body, in which case the first connecting electrode and the second connecting electrode may be exposed to both the first and second surfaces of the main body.

[0040] Although the above-mentioned embodiments, modified examples, and FIG. 3 illustrate and describe connecting electrodes exposed based on the second external electrode 144, it goes without saying that the same can be applied to any one or more of the first to fourth external electrodes.

[0041] In one example, the ratio (d1 / D) of the exposed length (d1) of the first or second connecting electrode to the diameter (D) of the connecting electrode may be within a range of 0.1 to 0.9. The ratio (d1 / D) may be 0.10 or more, 0.12 or more, 0.14 or more, 0.16 or more, 0.18 or more, or 0.20 or more, and may be 0.90 or less, 0.88 or less, 0.86 or less, 0.84 or less, 0.82 or less, or 0.80 or less, but is not limited thereto. If the ratio (d1 / D) of the exposed length (d1) of the first or second connecting electrode to the diameter (D) of the connecting electrode is smaller than the above range, a short circuit may occur when the connecting electrode is mounted on a board, and if it is larger than the above range, the connectivity between the connecting electrode and the external electrode may be poor.

[0042] In another embodiment of the present invention, a portion of the third connecting electrode or a portion of the fourth connecting electrode may be exposed to the first surface or the second surface of the body. Fig. 5 is a plan view of a multilayer ceramic capacitor according to an embodiment of the present invention. Referring to Fig. 5, at least a portion of the third connecting electrode or the fourth connecting electrode may be exposed to the first surface or the second surface of the body.

[0043] In one modification of the above embodiment, a part of the third connecting electrode and a part of the fourth connecting electrode may be arranged to be exposed on the first surface or the second surface of the main body. In this case, as shown in Fig. 5, the connecting electrode that contacts the external electrode on one side of the first surface S1 of the main body may be arranged so that a part of its cross section is exposed to one surface of the main body, and the connecting electrode that contacts the external electrode on the other side is arranged so that the entire cross section is in contact with the external electrode. In addition, in the above modification, the exposed connecting electrode may not be arranged on the second surface S2 of the main body.

[0044] In another modification of the above embodiment, the third or fourth connecting electrode may be disposed such that a portion of the third or fourth connecting electrode is exposed to the first and second surfaces of the body. In this case, either the third or fourth connecting electrode may be exposed to both the first and second surfaces of the body, and a portion of the connecting electrode may be exposed to both the first and second surfaces of the body.

[0045] In yet another modification of the above embodiment, a portion of the third connecting electrode and a portion of the fourth connecting electrode may be exposed to the first and second surfaces of the main body. In this case, a portion of the third connecting electrode and a portion of the fourth connecting electrode may be exposed to both the first and second surfaces of the main body.

[0046] In one example, the ratio (d3 / D) of the exposed length (d3) of the third or fourth connecting electrode to the diameter (D) of the connecting electrode may be within a range of 0.1 to 0.9. The ratio (d3 / D) may be 0.10 or more, 0.12 or more, 0.14 or more, 0.16 or more, 0.18 or more, or 0.20 or more, and may be 0.90 or less, 0.88 or less, 0.86 or less, 0.84 or less, 0.82 or less, or 0.80 or less, but is not limited thereto. If the ratio (d3 / D) of the exposed length (d3) of the third or fourth connecting electrode to the diameter (D) of the connecting electrode is smaller than the above range, a short circuit may occur when the connecting electrode is mounted on a board, and if it is larger than the above range, the connectivity between the connecting electrode and the external electrode may be poor.

[0047] In an embodiment of the present invention, the connecting electrodes 131, 132, 133, and 134 may contain nickel (Ni) in the largest amount, but are not limited thereto, and may be formed using a conductive paste containing at least one of silver (Ag), palladium (Pd), gold (Au), platinum (Pt), nickel (Ni), tin (Sn), copper (Cu), tungsten (W), titanium (Ti), and alloys thereof. The method of forming the connecting electrodes 131, 132, 133, and 134 is not particularly limited, and for example, after forming a laminate in which the dielectric layer 111, the first internal electrode 121, and the second internal electrode 122 are laminated, the body 110 is penetrated in the third direction (Z direction) using a laser drill or a mechanical pin puncher, and the connecting electrodes 131, 132, 133, and 134 may be formed by filling the conductive paste.

[0048] In one example, the internal electrodes 121, 122 and the connecting electrodes 131, 132, 133, 134 may contain the same metal component. The same metal component may be nickel (Ni), but is not limited thereto, and may be, for example, one or more of silver (Ag), palladium (Pd), gold (Au), platinum (Pt), nickel (Ni), tin (Sn), copper (Cu), tungsten (W), titanium (Ti), and alloys thereof. When the internal electrodes 121, 122 and the connecting electrodes 131, 132, 133, 134 of the multilayer ceramic capacitor according to the present invention contain the same metal component, the firing start temperature and / or firing shrinkage rate can be made the same, thereby preventing the occurrence of cracks, delamination, and the like.

[0049] In this specification, the shapes of the connecting electrodes 131, 132, 133, and 134 are illustrated as round, but the shapes may be rectangular, triangular, etc., and are not particularly limited. In addition, the connecting electrodes 131, 132, 133, and 134 may be formed to occupy 5 to 65% of the width direction (Y direction) of the main body, but are not limited thereto.

[0050] According to an embodiment of the present invention, the first to fourth external electrodes 141, 142, 143, 144 may be disposed on both sides of the body 110. The first and second external electrodes 141, 144 may be disposed on the first and second surfaces S1 and S2 of the body 110, respectively, and may be electrically connected to each other by the first connecting electrode 131 and the second connecting electrode 134. In addition, the third and fourth external electrodes 142, 143 may be disposed apart from the first and second external electrodes 141, 144, respectively, on the first and second surfaces S1 and S2 of the body 110, and may be electrically connected to each other by the third connecting electrode 132 and the fourth connecting electrode 133.

[0051] The multilayer ceramic capacitor 100 having the above structure can increase the area in which the first and second internal electrodes 121 and 122 are formed by reducing the margin of the side surface connecting the upper and lower surfaces of the body 110, thereby significantly improving the capacitance of the multilayer ceramic capacitor 100. That is, the multilayer ceramic capacitor 100 according to an embodiment of the present invention has an electrode structure in which no external electrodes are disposed on the side surface, and has a structure in which the internal electrodes are connected to the external electrodes by connecting electrodes penetrating the body, thereby significantly improving the capacitance.

[0052] In one example, the internal electrodes 121, 122 may contain the same metal component as the connecting electrodes 131, 132, 133, 134. The same metal component may be nickel (Ni), but is not limited thereto, and may be, for example, at least one of silver (Ag), palladium (Pd), gold (Au), platinum (Pt), nickel (Ni), tin (Sn), copper (Cu), tungsten (W), titanium (Ti), and alloys thereof. When the internal electrodes 121, 122 and the connecting electrodes 131, 132, 133, 134 of the multilayer ceramic capacitor according to the present invention contain the same metal component, there is an advantage that they can be fired simultaneously with the body and the internal electrodes, and the firing start temperature and / or firing shrinkage rate can be matched, thereby preventing the occurrence of cracks, delamination, and the like.

[0053] 8 and 9 are perspective views showing a multilayer ceramic capacitor according to another embodiment of the present invention. Hereinafter, the structure of the external electrodes will be described with reference to the first external electrodes 541 and 641 with reference to Figs. 8 and 9, but this can be equally applied to the second to fourth external electrodes.

[0054] 8, the first external electrode 541 may include first and second plating layers 541b and 541c sequentially stacked on a first fired electrode 541a. The first fired electrode 541a may be a fired electrode formed by firing a conductive paste containing nickel (Ni) as described above. When the external electrode is formed as a fired electrode, as in the first fired electrode 541a, there is an advantage that it is possible to simultaneously fire the main body and the internal electrode, and the adhesion strength between the main body and the external electrode can be further improved.

[0055] The first plating layer 541b according to an embodiment of the present invention may be a plating layer containing tin. In general, in the case of a fired electrode containing nickel, etc., an oxide layer is formed on the surface during firing, making it difficult to form a plating layer, and the formed plating layer is easily peeled off. In the multilayer ceramic capacitor according to the present embodiment, a uniform plating layer can be formed by disposing the first plating layer 541b containing tin, which has excellent plating characteristics, on the fired electrode 541a containing nickel.

[0056] In this case, the second plating layer 541c may be a plating layer containing nickel. By applying the second plating layer 541c containing nickel on the first plating layer 541b containing tin, it is possible to improve the strength of the plating layer while maintaining excellent electrical conductivity.

[0057] In one example, the multilayer ceramic capacitor according to the present invention may further include a third plating layer 641d including tin or copper on the second plating layer 641c. Referring to Fig. 9, the third plating layer 641d may be disposed by being laminated on the second plating layer 641c. Since the third plating layer 641d includes copper or tin, an external electrode having excellent conductivity, plating adhesion, and solderability may be formed.

[0058] According to one embodiment of the present invention, the first to fourth external electrodes 141, 142, 143, 144 of the present invention may have a thickness within a range of 1 μm to 30 μm. The thickness of the first to fourth external electrodes 141, 142, 143, 144 may mean the total thickness of the fired electrode and the first to third plating layers stacked together, and may mean the vertical distance from the main body to the surface of the external electrode. By adjusting the thickness of the external electrodes within the above range, they do not occupy much space when used for surface mounting or for embedding in a board, and have excellent mountability.

[0059] A method for manufacturing a multilayer ceramic capacitor according to the present invention will be described below. The structure of the multilayer ceramic capacitor described above will become clearer through the description of the manufacturing method.

[0060] First, a sheet having a predetermined thickness on one side of a ceramic green sheet made of a dielectric layer is laminated with a paste containing a conductive metal, thereby providing a main body including the dielectric layer and the first and second internal electrodes sandwiching the dielectric layer therebetween. A first cover portion and a second cover portion can be formed by laminating dielectric layers not including internal electrodes on the upper and lower parts of the main body.

[0061] After forming the cover, vias H are formed in the main body using a laser drill, a mechanical pin puncher, etc. Then, the vias H are filled with a conductive material by applying a conductive paste or by using a method such as plating, thereby forming first and second connecting electrodes.

[0062] Then, the first to fourth external electrodes connected to the first and second connecting electrodes are formed on one surface of the main body.

[0063] Specifically, the step of forming the first to fourth external electrodes includes the steps of forming first to fourth fired electrodes containing nickel on the main body, forming first plating layers on the first to fourth fired electrode layers, respectively, forming second plating layers on the first plating layers, respectively, and forming third plating layers on the second plating layers, respectively.

[0064] The fired electrode can be formed by applying a conductive paste containing nickel and firing it. The first plating layer contains tin and can be formed by electrical or chemical plating. The second plating layer contains nickel and can be formed by electrical or chemical plating. The third plating layer contains copper or tin and can be formed by electrical or chemical plating.

[0065] After the fired electrode layer is formed, calcination and firing are performed to form the first to third plating layers, thereby completing the multilayer ceramic capacitor shown in FIGS.

[0066] Although the embodiments of the present invention have been described in detail above, it will be apparent to those skilled in the art that the scope of the present invention is not limited thereto, and that various modifications and variations are possible within the scope of the technical idea of ​​the present invention described in the claims. [Explanation of symbols]

[0067] 100, 200, 500 Multilayer ceramic capacitors 110, 210, 510 Main unit 111, 211, 311, 411, 511 Dielectric layers 112, 212, 512, 113, 213, 513 Cover part 121, 122, 221, 222, 321, 322, 421, 422, 521, 522 Internal electrode 131, 132, 133, 134, 231, 232, 233, 234, 331, 332, 333, 334, 431, 432, 433, 434, 531, 532, 533, 534 Connected electrode 141, 142, 143, 144, 241, 242, 243, 244, 541, 542, 543, 544 External electrode 141a, 142a, 143a, 144a, 241a, 242a, 243a, 244a, 541a, 542a, 543a, 544a Sintered electrodes 141b, 142b, 143b, 144b, 241b, 242b, 243b, 244b, 541b, 542b, 543b, 544b First plating layer 141c, 142c, 143c, 144c, 241c, 242c, 243c, 244c, 541c, 542c, 543c, 544c Second plating layer

Claims

1. a dielectric layer, and a first internal electrode and a second internal electrode disposed with the dielectric layer therebetween; a main body including a first surface and a second surface facing a third direction, a third surface and a fourth surface facing the second direction, and a fifth surface and a sixth surface facing the first direction, in which the dielectric layer and the first internal electrode and the second internal electrode are laminated in the third direction; a first connecting electrode and a second connecting electrode penetrating the body in the third direction and connected to the first internal electrode; a third connecting electrode and a fourth connecting electrode penetrating the body in the third direction and connected to the second internal electrode; a second external electrode disposed on a first surface of the body and connected to the first connecting electrode and the second connecting electrode; a first external electrode disposed on a second surface of the body and connected to the first connecting electrode and the second connecting electrode; a third external electrode spaced apart from the first external electrode and connected to the third connecting electrode and the fourth connecting electrode; a fourth external electrode spaced apart from the second external electrode and connected to the third connecting electrode and the fourth connecting electrode, an area or width of a portion of the first connecting electrode and the second connecting electrode that is not connected to the second external electrode on the side of the third connecting electrode and the fourth connecting electrode on the first surface of the body exceeds 0; the third connecting electrode and the fourth connecting electrode are all connected to the fourth external electrode at their cross sections on the first surface of the main body; a first connecting electrode and a second connecting electrode, the first connecting electrode and the second connecting electrode being connected to the second external electrode, the first connecting electrode and the second connecting electrode being exposed to the outside;

2. 2 . The multilayer ceramic capacitor according to claim 1 , wherein an area or width of a portion of the first connecting electrode and the second connecting electrode that is not connected to the first external electrode and the second external electrode on the third connecting electrode and the fourth connecting electrode side on the first surface and the second surface of the body exceeds 0.

3. 3. The multilayer ceramic capacitor according to claim 1, wherein a ratio (d1 / D) of a length (d1) of a portion of the first connecting electrode or the second connecting electrode that is not connected to the second external electrode on the third connecting electrode and the fourth connecting electrode side on the first surface to a diameter (D) of the connecting electrode is within a range of 0.1 to 0.

9.

4. The multilayer ceramic capacitor according to claim 1 , wherein the internal electrodes and the connecting electrodes contain the same metal component.

5. The multilayer ceramic capacitor according to claim 1 , wherein the connecting electrodes and the external electrodes contain the same metal component.

6. The multilayer ceramic capacitor according to claim 1 , wherein the first to fourth external electrodes include a first plating layer and a second plating layer sequentially stacked on a fired electrode.

7. The first internal electrode and the second internal electrode are T-shaped and point-symmetric to each other, the first connecting electrode and the fourth connecting electrode pass through an unarranged region of the second internal electrode; The multilayer ceramic capacitor according to claim 1 , wherein the second connecting electrode and the third connecting electrode pass through an unarranged region of the first internal electrode.

8. The body has a length in the first direction greater than a length in the second direction, the first connecting electrode and the second connecting electrode are spaced apart from each other in the first direction on the main body, the third connecting electrode and the fourth connecting electrode are spaced apart from each other in the first direction on the main body, the first connecting electrode and the third connecting electrode are spaced apart from each other in the second direction on the main body, The multilayer ceramic capacitor of claim 1 , wherein the second connecting electrode and the fourth connecting electrode are spaced apart from each other in the second direction on the main body.

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