Multilayer capacitor

Abstract

To provide a laminate-type capacitor which can reduce the cracking owing to an internal stress, and enables the enhancement in voltage resistance.SOLUTION: A laminate-type capacitor according to an embodiment of the invention comprises: a main body including a capacitance area in which at least one first internal electrode and at least one second internal electrode are alternately laminated in a first direction with at least one dielectric layer arranged therebetween; and first and second external electrodes disposed on the main body apart from each other so that they are connected to at least one first internal electrode and at least one second internal electrode respectively. The main body includes a side margin which does not overlap with at least one first internal electrode and at least one second internal electrode in a first direction; a center width of the side margin may be made larger than a minimum width of the side margin.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] This invention relates to a multilayer capacitor. [Background technology]

[0002] Multilayer capacitors are widely used as components in electronic devices such as computers, PDAs, and mobile phones due to their advantages of being small yet guaranteeing high capacitance and being easy to implement. They are also widely used as components in electrical equipment (including vehicles) due to their high reliability and high strength characteristics.

[0003] High dielectric materials with high dielectric constants that can be used in multilayer capacitors can also possess piezoelectric properties. Therefore, multilayer capacitors can be affected by internal stress due to the inverse piezoelectric (or electrostrictive) phenomenon caused by the application of voltage. This internal stress can cause cracks in the multilayer capacitor or reduce its dielectric strength. [Prior art documents] [Patent Documents]

[0004] [Patent Document 1] Korean Published Patent Gazette No. 10-2015-0042500 [Overview of the Initiative] [Problems that the invention aims to solve]

[0005] This invention provides a multilayer capacitor that can reduce cracks caused by internal stress and improve voltage resistance characteristics. [Means for solving the problem]

[0006] A multilayer capacitor according to one embodiment of the present invention includes a body containing a capacitance region in which at least one first internal electrode and at least one second internal electrode are alternately stacked in a first direction with at least one dielectric layer in between, and first and second external electrodes disposed on the body spaced apart from each other so as to be connected to the at least one first internal electrode and at least one second internal electrode, respectively, wherein the body includes side margins that do not overlap the at least one first internal electrode and at least one second internal electrode in the first direction, and the center width of the side margins can be wider than the minimum width of the side margins.

[0007] A multilayer capacitor according to one embodiment of the present invention includes a body containing a capacitance region in which at least one first internal electrode and at least one second internal electrode are alternately stacked in a first direction with at least one dielectric layer in between, and first and second external electrodes disposed on the body spaced apart from each other so as to be connected to the at least one first internal electrode and at least one second internal electrode, respectively, wherein each of the at least one first internal electrode and at least one second internal electrode may have a recessed region that overlaps with each other in the first direction.

[0008] A multilayer capacitor according to one embodiment of the present invention includes a body containing a capacitance region in which at least one first internal electrode and at least one second internal electrode are alternately stacked in a first direction with at least one dielectric layer in between, and first and second external electrodes disposed on the body spaced apart from each other so as to be connected to the at least one first internal electrode and at least one second internal electrode, respectively, wherein the at least one first internal electrode may have a recessed region including a point at 50% of the body in the direction from the first external electrode toward the second external electrode. [Effects of the Invention]

[0009] One embodiment of the present invention provides a multilayer capacitor that can reduce cracks caused by internal stress and improve voltage withstand characteristics.

Brief Description of the Drawings

[0010] [Figure 1] It is a perspective view showing a structure in which a multilayer capacitor according to an embodiment of the present invention is mounted on a substrate. [Figure 2] It is a perspective view showing the inside of the main body of a multilayer capacitor according to an embodiment of the present invention. [Figure 3a] It is a cross-sectional view showing C-C' of FIG. 2. [Figure 3b] It is a cross-sectional view illustrating a first modified structure of the side margin and the recess region of a multilayer capacitor according to an embodiment of the present invention. [Figure 3c] It is a cross-sectional view illustrating a second modified structure of the side margin and the recess region of a multilayer capacitor according to an embodiment of the present invention. [Figure 3d] It is a cross-sectional view illustrating a second modified structure of the side margin and the recess region of a multilayer capacitor according to an embodiment of the present invention. [Figure 3e] It is a cross-sectional view illustrating a third modified structure of the side margin and the recess region of a multilayer capacitor according to an embodiment of the present invention. [Figure 4a] It is a perspective view showing a multilayer capacitor according to an embodiment of the present invention and its inside. [Figure 4b] It is a perspective view showing a multilayer capacitor according to an embodiment of the present invention and its inside. [Figure 4c] It is a perspective view illustrating a modified structure of the side margin and the recess region of a multilayer capacitor according to an embodiment of the present invention. [Figure 5a] It is a cross-sectional view showing A-A' of FIG. 4a. [Figure 5b] It is a cross-sectional view showing D-D' of FIG. 4b. [Figure 6] It is a cross-sectional view showing B-B' of FIG. 4a. [Figure 7] It is a graph showing the internal stress of a multilayer capacitor according to an embodiment of the present invention. [Figure 8a]This is a cross-sectional view showing the distribution of internal stress in a multilayer capacitor. [Figure 8b] This is a cross-sectional view showing the distribution of internal stress in a multilayer capacitor. [Modes for carrying out the invention]

[0011] Embodiments of the present invention can be modified into several other forms, and the scope of the invention is not limited to the embodiments described below. Furthermore, embodiments of the present invention are provided to give a more complete explanation of the invention to a person with average skill in the art. Accordingly, the shapes and sizes of elements in the drawings may be enlarged or reduced (or highlighted or simplified) for a clearer explanation, and elements indicated by the same reference numerals in the drawings are the same elements.

[0012] Furthermore, in order to clearly explain the present invention in the drawings, parts unrelated to the explanation are omitted, the thickness is enlarged to clearly represent multiple layers and regions, and components with the same function within the scope of the same concept are described using the same reference numerals.

[0013] Throughout the specification, when a part "includes" a certain component, unless otherwise specifically stated, it means that it may include other components rather than excluding them.

[0014] To clearly describe embodiments of the present invention, the directions of the hexahedron are defined as follows: L, W, and T shown in the drawings represent the length direction, width direction, and thickness direction, respectively. Here, the thickness direction is used as a concept identical to the stacking direction in which the dielectric layers are stacked.

[0015] The following describes a multilayer capacitor according to one embodiment of the present invention, specifically referring to it as a multilayer ceramic capacitor (MLCC), but not being limited thereto.

[0016] Figure 1 is a perspective view showing a multilayer capacitor according to one embodiment of the present invention mounted on a substrate; Figure 2 is a perspective view showing the inside of the body of the multilayer capacitor according to one embodiment of the present invention; Figure 3a is a cross-sectional view showing C-C' in Figure 2; Figures 4a and 4b are perspective views showing the multilayer capacitor and its interior according to one embodiment of the present invention; Figure 5a is a cross-sectional view showing A-A' in Figure 4a; Figure 5b is a cross-sectional view showing D-D' in Figure 4b; and Figure 6 is a cross-sectional view showing B-B' in Figure 4a.

[0017] Referring to Figures 1, 2, 3a, 4a, 4b, 5a, and 6, the multilayer capacitor 100 according to one embodiment of the present invention may include a main body 110, a first external electrode 131, and a second external electrode 132.

[0018] The main body 110 may include a laminated structure in which at least one first internal electrode 121 and at least one second internal electrode 122 are alternately stacked in a first direction (e.g., T direction) with at least one dielectric layer 111 in between.

[0019] For example, the main body 110 can be constructed from a ceramic body by firing a laminated structure. Here, at least one dielectric layer 111 placed on the main body 110 is in a sintered state, and the boundaries between adjacent dielectric layers can be integrated to such an extent that they are difficult to see without using a scanning electron microscope (SEM).

[0020] For example, the main body 110 can be formed from a hexahedron having both sides in the length direction L, both sides in the width direction W, and both sides in the thickness direction T, and the corners and / or edges of the hexahedron can be rounded by polishing. However, the shape, dimensions, and number of dielectric layers 111 of the main body 110 are not limited to those shown in this embodiment.

[0021] At least one dielectric layer 111 can have its thickness arbitrarily changed to match the capacitance design of the multilayer capacitor 100, and may contain ceramic powder with a high dielectric constant, such as barium titanate (BaTiO3) based powder, but the present invention is not limited thereto. In addition, various ceramic additives (e.g., MgO, Al2O3, SiO2, ZnO), organic solvents, plasticizers, binders, dispersants, etc., can be added to the ceramic powder according to the requirements of the multilayer capacitor 100.

[0022] The average particle size of the ceramic powder used to form at least one dielectric layer 111 is not particularly limited and can be adjusted according to the requirements of the multilayer capacitor 100 (e.g., whether miniaturization and / or high capacitance are required, as in capacitors for electronic equipment, or whether high voltage withstand characteristics and / or high strength are required, as in capacitors for electrical equipment), but can be adjusted to, for example, 400 nm or less.

[0023] For example, at least one dielectric layer 111 can be formed by coating and drying a slurry containing a powder such as barium titanate (BaTiO3) onto a carrier film to provide a plurality of ceramic sheets. The ceramic sheets can be formed by mixing ceramic powder, a binder, and a solvent to produce a slurry, and then fabricating the slurry into a sheet with a thickness of several micrometers using a doctor blade method, but are not limited to this.

[0024] At least one first internal electrode 121 and at least one second internal electrode 122 can be formed by printing a conductive paste containing a conductive metal so as to be alternately exposed on one side and the other side of the body 110 in the longitudinal direction L along the stacking direction of the dielectric layer (e.g., T direction), and can be electrically insulated from each other by a dielectric layer placed in between.

[0025] For example, each of at least one first internal electrode 121 and at least one second internal electrode 122 may be formed from a conductive paste for internal electrodes containing 40-50% by weight of conductive metal powder with an average particle size of 0.1-0.2 μm, but is not limited thereto. The conductive paste may be nickel (Ni), copper (Cu), palladium (Pd), silver (Ag), lead (Pb), or platinum (Pt), either alone or in alloys thereof, but the present invention is not limited thereto.

[0026] For example, the conductive paste for the internal electrodes can be applied to the ceramic sheet using a printing method to form the internal electrode pattern. The printing method for the conductive paste can be screen printing, gravure printing, or inkjet printing, but the present invention is not limited to these. For example, the main body 110 can be manufactured by laminating 200 to 300 layers of ceramic sheets on which the internal electrode pattern is printed, then pressing and firing them.

[0027] The capacitance of the multilayer capacitor 100 is proportional to the overlapping area in the stacking direction (e.g., T direction) between at least one first internal electrode 121 and at least one second internal electrode 122, proportional to the total number of stacks of at least one first internal electrode 121 and at least one second internal electrode 122, and inversely proportional to the distance between at least one first internal electrode 121 and at least one second internal electrode 122. The above distance can be substantially the same as the thickness of each of the at least one dielectric layer 111.

[0028] The multilayer capacitor 100 can have a larger capacitance relative to its thickness as the distance between at least one first internal electrode 121 and at least one second internal electrode 122 decreases. On the other hand, the withstand voltage of the multilayer capacitor 100 can be higher as the distance increases. Therefore, the distance can be adjusted according to the requirements of the multilayer capacitor 100 (e.g., whether miniaturization and / or high capacitance are required, as in capacitors for electronic equipment, or whether high withstand voltage characteristics and / or high strength are required, as in capacitors for electrical equipment). The thickness of at least one first internal electrode 121 and at least one second internal electrode 122 can also be affected by the distance.

[0029] For example, when high voltage withstand characteristics and / or high strength are required, the multilayer capacitor 100 can be designed such that the distance between at least one first internal electrode 121 and at least one second internal electrode 122 exceeds twice the thickness of each electrode. For example, when miniaturization and / or high capacitance are required, the multilayer capacitor 100 can be designed such that the thickness of at least one first internal electrode 121 and at least one second internal electrode 122 is 0.4 μm or less, and the total number of layers is 400 or more.

[0030] The first and second external electrodes 131 and 132 can be arranged on the main body 110 spaced apart from each other so as to be connected to at least one first internal electrode 121 and at least one second internal electrode 122, respectively.

[0031] For example, the first and second external electrodes 131 and 132 can be formed by dipping in a paste containing a metal component, printing a conductive paste, sheet transfer, pad transfer, sputter plating, or electroplating. For example, the first and second external electrodes 131 and 132 may include a fired layer formed by firing the paste and a plated layer formed on the outer surface of the fired layer, and may further include a conductive resin layer between the fired layer and the plated layer. For example, the conductive resin layer may be formed by incorporating conductive particles into a thermosetting resin such as epoxy. The metal component may be, but is not limited to, copper (Cu), palladium (Pd), platinum (Pt), gold (Au), silver (Ag), lead (Pb), tin (Sn), etc., either alone or in alloys thereof.

[0032] The multilayer capacitor 100 can be mounted or embedded on the substrate 210 and connected to first and second pads 221 and 222 on the substrate 210 via first and second external electrodes 131 and 132, thereby being electrically connected to circuits (e.g., integrated circuits, processors) electrically connected to the substrate 210.

[0033] The solder 230 can be positioned in contact with the first and second external electrodes 131 and 132 and the first and second pads 221 and 222 of the substrate 210 by a reflow process while the first and second external electrodes 131 and 132 of the multilayer capacitor 100 are placed on the first and second pads 221 and 222 of the substrate 210, thereby fixing them together. The solder 230 may have a lower melting point than copper (Cu) which may be contained in the first and second external electrodes 131 and 132, and may contain tin (Sn) or a tin alloy.

[0034] Referring to Figures 4a, 4b, 5a, 5b, and 6, the main body 110 may include an upper cover layer 112, a lower cover layer 113, and a core region 115, the core region 115 may include a side margin SM and a capacity region 116.

[0035] The upper and lower cover layers 112 and 113 are arranged so as to sandwich the core region 115 in a first direction (e.g., the T direction), and each can be thicker than each of at least one dielectric layer 111.

[0036] The upper and lower cover layers 112 and 113 can prevent external environmental elements (e.g., moisture, plating solution, foreign matter) from penetrating the core region 115, protect the main body 110 from external impacts, and improve the bending strength of the main body 110.

[0037] For example, the upper and lower cover layers 112 and 113 may include at least one dielectric layer 111 and other materials (e.g., thermosetting resins such as epoxy resin).

[0038] Since the capacitance region 116 can include the space between at least one first internal electrode 121 and at least one second internal electrode 122, it can form the capacitance of the multilayer capacitor 100.

[0039] The capacitance region 116 may include a laminated structure in which at least one first internal electrode 121 and at least one second internal electrode 122 are alternately stacked in a first direction (e.g., T direction) with at least one dielectric layer 111 in between, and may have the same size as the above laminated structure.

[0040] The side margin SM may include the space between the boundary line M of at least one first internal electrode 121 and at least one second internal electrode 122 and the surface of the main body 110. That is, the side margin SM may not overlap the at least one first internal electrode 121 and at least one second internal electrode 121 in a first direction (e.g., the T direction).

[0041] Multiple side margins SM can be arranged such that a capacity region 116 is sandwiched between them in a second direction (e.g., the W direction) perpendicular to a first direction (e.g., the T direction).

[0042] Multiple side margins SM can prevent at least one first internal electrode 121 and at least one second internal electrode 122 from being exposed to the surface in a second direction (e.g., the W direction) from the main body 110. This prevents external environmental elements (e.g., moisture, plating solution, foreign matter) from penetrating to at least one first internal electrode 121 and at least one second internal electrode 122 through the surface in the second direction, thereby improving the reliability and lifespan of the multilayer capacitor 100. Furthermore, since at least one first internal electrode 121 and at least one second internal electrode 122 can be efficiently extended in the second direction by the multiple side margins SM, the multiple side margins SM can also increase the overlapping area between at least one first internal electrode 121 and at least one second internal electrode 122, contributing to an improvement in the capacitance of the multilayer capacitor 100.

[0043] Figures 8a and 8b are cross-sectional views showing the distribution of internal stress in a multilayer capacitor.

[0044] The capacitance per unit size of the multilayer capacitor 100 can be larger the higher the dielectric constant of at least one dielectric layer 111. Therefore, at least one dielectric layer 111 can include a material with a high dielectric constant, such as barium titanate (BaTiO3). Since materials with a high dielectric constant, such as barium titanate (BaTiO3), are likely to also possess piezoelectric properties, internal stress can be formed due to the inverse piezoelectric (or electrostrictive) phenomenon caused by the application of voltage to the multilayer capacitor 100.

[0045] Referring to Figure 8a, internal stresses can be formed in the direction in which at least one first internal electrode 121 and at least one second internal electrode 122 are stacked (perpendicular direction), and the internal stresses can be even greater on the surface of the multilayer capacitor, and large surface stresses can cause tensile and expansion of the multilayer capacitor.

[0046] Internal stress can include vertical and horizontal vector components, and the overlap of vertical / horizontal vector components is more reinforcing than canceling out as it approaches the surface of the multilayer capacitor; therefore, the internal stress of a multilayer capacitor can be greatest at the side surface of the multilayer capacitor.

[0047] Figure 8b shows that internal stress is most concentrated on the side surface of the multilayer capacitor. This concentration of internal stress can cause cracks or electrical bottlenecks (e.g., air gaps, unstable internal electrode boundaries).

[0048] Referring again to Figures 2, 3a, 4a, 4b, 5a, and 5b, the center width W of the side margin SM is... B The minimum width W of the side margin SM is A It can be wider than that. Alternatively, each of at least one first internal electrode 121 and at least one second internal electrode 122 may include a recessed region RC that overlaps with each other in a first direction (e.g., the T direction).

[0049] As a result, the center of the side margin SM and the recessed region RC can efficiently distribute concentrated internal stress, thus preventing the occurrence of cracks and electrical bottlenecks caused by concentrated internal stress in the side margin SM.

[0050] Side margin SM center width W B The minimum width W of the side margin SM can be measured as the average width between two points in the LW cross-section exposed after cutting or polishing the main body 110, with the width of the side margin SM changing abruptly along the L direction, as the XY plane including the center of the main body 110. A This can be measured as the average width outside the L direction of the two points mentioned above. The center width W of the side margin SM. B and minimum width W AThis can be measured by analysis using at least one of the following: TEM (Transmission Electron Microscopy), AFM (Atomic Force Microscope), SEM (Scanning Electron Microscope), optical microscope, and surface profiler.

[0051] For example, the side margin SM may include a side margin layer 114 and a central margin portion CM. When the side margin SM is provided on both surfaces in the W direction of the main body 110, it can provide multiple side margin layers 114 and multiple central margin portions CM.

[0052] The side margin layer 114 can provide the surface of the main body 110, and the minimum width W of the side margin SM A They can have the same thickness. Multiple side margin layers 114 can be arranged such that capacitive regions 116 are located between them. For example, the side margin layers 114 can include barium titanate (BaTiO3) based ceramic material and can be formed in a manner similar to at least one dielectric layer 111 (but with a different stacking direction).

[0053] The central margin portion CM is located between the center of the side margin layer 114 and the capacitance region 116, and a portion of at least one dielectric layer 111 included in the capacitance region 116 can be placed therein.

[0054] For example, the central margin CM may include portions in at least one dielectric layer 111 that do not overlap with either at least one first internal electrode 121 or at least one second internal electrode 122 in the first direction (e.g., the T direction). Therefore, the central margin CM may include empty space on the upper and / or lower surfaces of at least one dielectric layer 111 equal to the area where at least one first internal electrode 121 and at least one second internal electrode 122 are not located. This empty space can provide margin for fine movement of at least one dielectric layer 111 within the central margin CM due to internal stress concentrated at the center of the side margin SM. As a result, the central margin CM can efficiently relieve the internal stress concentrated at the center of the side margin SM.

[0055] The center of the outer surface of the side margin layer 114, where internal stress can be concentrated, can be the surface of the main body 110 closest to the recessed region RC, and can not be connected to any conductive structures (e.g., external electrodes, via electrodes, terminals, etc.).

[0056] The center of the side margin SM, where internal stress can be concentrated, can include a point at 50% of the body 110 in the direction from the first external electrode 131 to the second external electrode 132 (e.g., the L direction). Therefore, the central margin CM and recessed region RC can efficiently distribute / relax the concentrated internal stress by including a point at 50% of the body 110 in the direction from the first external electrode 131 to the second external electrode 132 (e.g., the L direction).

[0057] The central margin portion CM can be columnar, extending in the first direction (e.g., the T direction). As Figure 8a shows that tensile stress is formed vertically in response to internal stress concentrated on the side surface, the central margin portion CM can efficiently distribute / relax the tensile stress by having a form that extends in the same direction as the tensile stress caused by the internal stress concentrated on the side surface.

[0058] For example, the length of the central margin portion CM in the direction in which the first and second external electrodes 131 and 132 face each other (e.g., the L direction) and the length L of the recess region RC D can be more than 0.25 times and less than 0.7 times the length L of the main body 110. Thereby, the side margin SM and the recess region RC can stably ensure the reliability of the dispersion / relaxation of the internal stress and can not significantly affect the capacitance of the capacitance region 116. The central width W of the side margin SM chip and the minimum width W B are measured in a similar manner. The length L A can be measured as the average length in the LW cross-section including the center of the main body 110. D

[0059] The minimum width W of the side margin SM A can be the width at the 10% point and / or the 90% point of the main body 110 in the direction from the first external electrode 131 to the second external electrode 132 (e.g., the L direction). Therefore, the central width W of the side margin SM B can be wider than the width at the 10% point and / or the 90% point.

[0060] FIG. 7 is a graph showing the internal stress of a multilayer capacitor according to an embodiment of the present invention.

[0061] The horizontal axis of FIG. 7 indicates the position in the L direction of the main body having a length of 2.0 mm, and the vertical axis indicates the internal stress бT for each position in the L direction due to the application of a voltage to the first and second external electrodes. Referring to FIG. 7, in the first case where the central width W of the side margin SM B and the minimum width W A are the same (W A =W B ), the point where the internal stress бT is maximum can be the 50% point in the L direction.

[0062] In the second case where the central width W of the side margin SM B is wider than the minimum width W A (W A <W B), the points where the internal stress бT is maximum can be approximately 30% and 70% in the L direction. That is, in the side margin, the points where the stress due to the voltage applied to the first and second external electrodes is maximum can be outside the center of the side margin (50% point).

[0063] Also, in the second case (W A <W B The maximum value of the internal stress бT in case 1 (W A =W B ) can be lower than that. Therefore, a multilayer capacitor according to one embodiment of the present invention can efficiently distribute / relax internal stress concentrated at 50% of the body in the L direction.

[0064] Figures 3b to 3e are cross-sectional views illustrating the deformation structure of the side margin and recessed region of a multilayer capacitor according to one embodiment of the present invention.

[0065] Referring to Figure 3a, the central margin portion CM and the recessed region RC can have an angular shape, and referring to Figure 3b, the cross-sections of the central margin portion CMb and the recessed region RCb of the side margin SMb of the stacked capacitor 100b according to one embodiment of the present invention can be semicircular.

[0066] Referring to Figures 3a and 3b, the side margins SM and SMb can be in a form that protrudes from the center toward at least one first internal electrode 121 and at least one second internal electrode 122.

[0067] Referring to Figures 3a, 3c, and 3d, a multilayer capacitor 100d according to one embodiment of the present invention may further include a first dummy electrode 141 and a second dummy electrode 142. The first dummy electrode 141 in Figure 3c and the second dummy electrode 142 in Figure 3d may be arranged within the central margin CMb and recessed region RCb in Figure 3a. The first dummy electrode 141 may be surrounded by at least one first internal electrode 121d and may be arranged at a distance from at least one first internal electrode 121d. The second dummy electrode 142 may be surrounded by at least one second internal electrode 122d and may be arranged at a distance from at least one second internal electrode 122d.

[0068] The first and second dummy electrodes 141 and 142 may contain the same material as at least one first internal electrode 121d and at least one second internal electrode 122d and may be formed in the same manner, but are not limited thereto. The influence of the first and second dummy electrodes 141 and 142 on the internal stress mechanism of the body can be closer to the influence of at least one first internal electrode 121d and at least one second internal electrode 122d than to the influence of at least one dielectric layer 111, hence the width W in Figure 3a. B and length L D This can be considered to become even smaller when the first and second dummy electrodes 141 and 142 are added.

[0069] Referring to Figure 3e, at least one second internal electrode 122e of the multilayer capacitor 100e according to one embodiment of the present invention may not provide the central margin CM and recessed region RC of Figure 3a. Here, at least one first internal electrode of the multilayer capacitor 100e may be identical in form to at least one first internal electrode 121 of Figure 3a and at least one first internal electrode 121d of Figure 3c. Therefore, a portion of at least one second internal electrode 122e may overlap the central margin CM and recessed region RC of Figure 3a and the first dummy electrode 141 of Figure 3c in a first direction (e.g., the T direction).

[0070] Figure 4c is a perspective view showing the deformation structure of the side margin and recessed region of a multilayer capacitor according to one embodiment of the present invention.

[0071] Referring to Figure 4c, the central margin portion CMc and the central width Wc of the central margin portion CMc and recessed region RCc of the side margin SMc of the stacked capacitor 100c according to one embodiment of the present invention can be wider than the width Wa of the upper / lower end. Therefore, the central width Wc of the central margin portion CMc and the recessed region RCc can be wider than the width at 1 / 3 of the body 110 in the first direction (e.g., the T direction) and wider than the width at 2 / 3 of the body.

[0072] Internal stress can be distributed while being concentrated in the center of the side margin SMc, and the morphology of the central margin portion CMc and the recessed region RCc can reduce the distance deviation from the center of the side margin SMc to the internal electrode, thereby increasing the efficiency of internal stress distribution.

[0073] Side margin SM center width W B and minimum width W A Similar to the measurement method, the center width Wc and the upper / lower width Wa can be measured in the WT cross section including the center of the main body 110.

[0074] Although embodiments of the present invention have been described in detail above, the present invention is not limited by the embodiments described above and the accompanying drawings, but is limited by the claims provided. Therefore, within the scope of the technical idea of ​​the present invention as described in the claims, various forms of substitution, modification, and alteration are possible by persons with ordinary skill in the art, and these also fall within the scope of the present invention. [Explanation of Symbols]

[0075] 100 Multilayer Capacitors 110 Main unit (body) 111 Dielectric layer 112 Upper cover layer 113 Lower cover layer 114 Side margin layer 115 Core Areas 116 capacity area 121 1st internal electrode 122 2nd internal electrode 131 1st external electrode 132 2nd external electrode CM (Central Margin Section) RC recessed area SM side margin

Claims

1. A body including a capacitive region in which at least one first internal electrode and at least one second internal electrode are alternately stacked in a first direction with at least one dielectric layer in between, It includes first and second external electrodes, which are arranged in the main body spaced apart from each other so as to be connected to at least one first internal electrode and at least one second internal electrode, The main body includes side margins that do not overlap in the first direction between the at least one first internal electrode and the at least one second internal electrode. The center width of the side margin is wider than the minimum width of the side margin. The aforementioned side margin is Multiple side margin layers are arranged such that the aforementioned capacity region is located between them, It includes a plurality of central margin portions, each positioned between the center of the plurality of side margin layers and the capacity region, Each of the aforementioned plurality of central margin portions is columnar in shape and extends in the first direction. Multilayer capacitor.

2. The multilayer capacitor according to claim 1, wherein the length of each of the plurality of central margin portions in the direction in which the first and second external electrodes face each other is greater than 0.25 times but less than 0.75 times the length of the main body.

3. The center width of each of the aforementioned multiple central margin portions is: The multilayer capacitor according to claim 1, wherein in the plurality of central margin portions, the width is wider in the first direction than the width at the point where 1 / 3 of the main body is located and wider than the width at the point where 2 / 3 of the main body is located.

4. The center width of the aforementioned side margin is, The multilayer capacitor according to claim 1, wherein the side margin is wider in the direction from the first external electrode to the second external electrode than the width at the 10% point of the main body and wider than the width at the 90% point.

5. The side margin has a shape that protrudes from the center toward the at least one first internal electrode and the at least one second internal electrode. The multilayer capacitor according to claim 1, wherein the protruding portion of the side margin has a horn-like shape.

6. The multilayer capacitor according to claim 1, wherein the point in the side margin where the stress due to the application of voltage to the first and second external electrodes is maximum is off-center from the side margin.

7. The at least one dielectric layer and the side margin are each made of barium titanate (BaTiO ３ A multilayer capacitor according to claim 6, comprising a ceramic material of the ) type.

8. The stacked capacitor according to claim 1, wherein each of the at least one first internal electrode and the at least one second internal electrode has a recessed region that overlaps with each other in the first direction.

9. The aforementioned main body is A first dummy electrode is disposed in a recessed region of the at least one first internal electrode and is disposed at a distance from the at least one first internal electrode, The stacked capacitor according to claim 8, further comprising a second dummy electrode disposed in a recessed region of the at least one second internal electrode and spaced apart from the at least one second internal electrode.

10. A body including a capacitive region in which at least one first internal electrode and at least one second internal electrode are alternately stacked in a first direction with at least one dielectric layer in between, It includes first and second external electrodes, which are arranged in the main body spaced apart from each other so as to be connected to at least one first internal electrode and at least one second internal electrode, Each of the at least one first internal electrode and the at least one second internal electrode has a recessed region that overlaps with each other in the first direction. A multilayer capacitor in which the central width of the recessed region is wider than the width at one-third of the way across the main body in the first direction and wider than the width at two-thirds of the way across.

11. The multilayer capacitor according to claim 10, wherein the surface of the main body closest to the recessed region is not connected to the conductive structure.

12. The stacked capacitor according to claim 10, wherein the recessed region includes a point at 50% of the body in the direction from the first external electrode toward the second external electrode.

13. The stacked capacitor according to claim 10, wherein the length of the recessed region in the direction in which the first and second external electrodes face each other is greater than 0.25 times but less than 0.75 times the length of the main body.

14. A body including a capacitive region in which at least one first internal electrode and at least one second internal electrode are alternately stacked in a first direction with at least one dielectric layer in between, It includes first and second external electrodes, which are arranged in the main body spaced apart from each other so as to be connected to at least one first internal electrode and at least one second internal electrode, The at least one first internal electrode has a recessed region including a point 50% of the body in the direction from the first external electrode toward the second external electrode, A multilayer capacitor in which the central width of the recessed region is wider than the width at one-third of the way across the main body in the first direction and wider than the width at two-thirds of the way across.

15. The stacked capacitor according to claim 14, wherein the recessed region of at least one first internal electrode overlaps a portion of the at least one second internal electrode in the first direction.

16. The main body further includes a first dummy electrode disposed in a recessed region of the at least one first internal electrode and spaced apart from the at least one first internal electrode, The multilayer capacitor according to claim 14, wherein the first dummy electrode overlaps a portion of at least one second internal electrode in the first direction.

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