Multilayer capacitor and its mounting substrate

Abstract

To provide a multilayer capacitor which may have increased capacitance and may alleviate an electric field concentration phenomenon.SOLUTION: The present invention provides a multilayer capacitor and a substrate including the same mounted thereon. The multilayer capacitor includes: a capacitor body including a dielectric layer and first and second internal electrodes and having first to sixth surfaces; and first and second external electrodes. The capacitor body further includes an active region and upper and lower cover regions. In the active region, width margins divided into a first region on an internal side and a second region on an external side are formed on both sides, and the upper and lower cover regions each are divided into a third region on an internal side and a fourth region on an external side. The active region, the second region, and the fourth region have a same dielectric constant, and the first region and the third region have a same dielectric constant. When the dielectric constant of the active region, the second region, and the fourth region is defined as A, and the dielectric constant of the first region and the third region is defined as B, 0.5≤B / A is satisfied.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a multilayer capacitor and a mounting board thereof. [Background technology]

[0002] Examples of electronic components using ceramic materials include capacitors, inductors, piezoelectric elements, varistors, and thermistors.

[0003] Among these, the multilayer capacitor is used in various electronic devices because it can achieve high capacitance despite its small size.

[0004] Recently, the range of applications of the above-mentioned multilayer capacitors has expanded from IT products to vehicle products. However, the multilayer capacitors used in vehicle products in particular are required to have high reliability due to the severe operating environment.

[0005] Such a multilayer capacitor includes a capacitor body made of a ceramic material, an internal electrode disposed inside the capacitor body, and an external electrode disposed on a surface of the capacitor body so as to be connected to the internal electrode.

[0006] On the other hand, thinning technology is being integrated to miniaturize multilayer capacitors, but a side effect of thinning is that an electric field may concentrate at the tip of the internal electrode when voltage is applied. This phenomenon may induce dielectric breakdown, which is one of the main defects of multilayer capacitors, and may reduce the reliability of the multilayer capacitor.

[0007] Therefore, research is needed to alleviate the electric field concentration at the tip of the internal electrode while still ensuring a certain level of high capacitance. [Prior art documents] [Patent documents]

[0008] [Patent Document 1] Korean Patent Publication No. 2016-0084614 [Patent Document 2] Patent No. 312933 specification Summary of the Invention [Problem to be solved by the invention]

[0009] An object of the present invention is to provide a multilayer capacitor that can maximize the area of ​​the internal electrodes to increase capacitance and can alleviate the electric field concentration phenomenon at the interface between the active region and margin portion of the capacitor body where the tips of the internal electrodes are exposed. [Means for solving the problem]

[0010] According to one aspect of the present invention, there is provided a capacitor body including a dielectric layer and first and second internal electrodes, the capacitor body including first and second surfaces opposed to each other, third and fourth surfaces connected to the first and second surfaces and opposed to each other, and fifth and sixth surfaces connected to the first and second surfaces and connected to the third and fourth surfaces and opposed to each other, the first internal electrode being exposed to the third surface and the second internal electrode being exposed to the fourth surface, and first and second external electrodes respectively disposed on the third and fourth surfaces of the body and connected to the first and second internal electrodes, the capacitor body including an active region in which the first and second internal electrodes are alternately arranged with a dielectric layer sandwiched therebetween, and a lamination method of the active region. and upper and lower cover regions respectively provided on upper and lower surfaces in a direction connecting the fifth and sixth surfaces of the active region, a width margin is formed on both sides of the active region in a direction connecting the fifth and sixth surfaces, the width margin is divided into an inner first region and an outer second region, and the upper and lower cover regions are divided into an inner third region and an outer fourth region, the active region, the second region and the fourth region have the same dielectric constant, the first region and the third region have the same dielectric constant, and when the dielectric constant of the active region, the dielectric constant of the second region and the dielectric constant of the fourth region are defined as A and the dielectric constant of the first region and the dielectric constant of the third region are defined as B, a ratio of 0.5≦B / A is satisfied.

[0011] In one embodiment of the present invention, B / A can satisfy 0.937≦B / A.

[0012] In one embodiment of the present invention, when the average thickness of the dielectric layer is defined as C, the average thickness of the first or second internal electrode is defined as D, and the average width of the first region or third region is defined as E, C≦E and D≦E can be satisfied.

[0013] In one embodiment of the present invention, the active region, the second region, and the fourth region may have a larger grain size than the first region and the third region.

[0014] In an embodiment of the present invention, the first and second internal electrodes may have an average thickness of 0.4 μm or less.

[0015] In one embodiment of the present invention, the average thickness of the dielectric layer may be greater than 0.5 μm.

[0016] In one embodiment of the present invention, the first and second external electrodes may each include first and second connection portions disposed on third and fourth surfaces of the capacitor body, respectively, and connected to the first and second internal electrodes, and first and second band portions each extending from the first and second connection portions to a portion of the first surface of the body.

[0017] Another aspect of the present invention provides a mounting board for a multilayer capacitor, including: a substrate having first and second electrode pads on one surface; and a multilayer capacitor mounted such that first and second external electrodes are connected to the first and second electrode pads, respectively. Effect of the Invention

[0018] According to an embodiment of the present invention, by limiting the dielectric constant of the active region and the ratio of the dielectric constant of the inner margin to that of the outer margin, it is possible to improve the electric field concentration phenomenon at the interface between the active region and the margin of the capacitor body where the tips of the internal electrodes are exposed, thereby preventing dielectric breakdown and improving the reliability of the multilayer capacitor. [Brief description of the drawings]

[0019] [Figure 1] 1 is a perspective view illustrating a multilayer capacitor according to an embodiment of the present invention; [Diagram 2] 2 is a cross-sectional view taken along line II' in FIG. [Diagram 3] 2 is a cross-sectional view taken along line II-II' in FIG. [Figure 4a] 2 is a cross-sectional view showing the structure of a first internal electrode applied to the multilayer capacitor of FIG. 1. [Figure 4b] 2 is a cross-sectional view showing the structure of a second internal electrode applied to the multilayer capacitor of FIG. 1. [Diagram 5] 1 is a graph showing the average electric field measured according to changes in B / A. [Figure 6] 4 is a cross-sectional view showing a state in which the multilayer capacitor of FIG. 3 is mounted on a substrate. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0020] 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.

[0021] Additionally, throughout the specification, unless specifically stated to the contrary, "comprising" an element means that it may further include other elements, rather than excluding other elements.

[0022] In order to clearly explain the embodiments of the present invention, directions are defined as follows: X, Y, and Z shown in the drawings respectively indicate the length direction, width direction, and thickness direction of the multilayer capacitor.

[0023] In this embodiment, the Z direction can be used in the same concept as the lamination direction in which the dielectric layers are laminated.

[0024] FIG. 1 is a schematic perspective view of a multilayer capacitor according to one embodiment of the present invention, FIG. 2 is a cross-sectional view taken along line I-I' in FIG. 1, FIG. 3 is a cross-sectional view taken along line II-II' in FIG. 1, and FIGS. 4a and 4b are cross-sectional views respectively showing the structures of first and second internal electrodes applied to the multilayer capacitor of FIG. 1.

[0025] The multilayer capacitor of this embodiment will be described below with reference to FIGS. 1 to 4b.

[0026] 1 to 4b, the multilayer capacitor 100 of this embodiment includes a capacitor body 110 and first and second external electrodes 131 and 132. As shown in FIG.

[0027] The capacitor body 110 also includes an active area 115 and upper and lower cover areas 112, 113.

[0028] The upper and lower cover regions 112 and 113 are divided into an inner third region adjacent to the active region 115 and an outer fourth region in contact with the outer side of the capacitor body 110 .

[0029] The margin in the Y direction of the active region 115 is defined as a width margin, which is divided into an inner first region adjacent to the active region 115 and an outer second region in contact with the outer side of the capacitor body 110 .

[0030] In this case, the active region 115, the second region, and the fourth region have the same dielectric constant, and the first region and the third region have approximately the same dielectric constant.

[0031] Here, when the dielectric constant of the active region 115, the dielectric constant of the second region, and the dielectric constant of the fourth region are defined as A, and the dielectric constant of the first region and the dielectric constant of the third region are defined as B, 0.5≦B / A is satisfied.

[0032] The capacitor body 110 is formed by stacking a plurality of dielectric layers 111 in the Z direction and then firing them, and the boundaries between adjacent dielectric layers 111 of the capacitor body 110 can be so integrated that they are difficult to see without using a scanning electron microscope (SEM).

[0033] The capacitor body 110 includes a plurality of dielectric layers 111, and first and second internal electrodes 121 and 122 having different polarities and alternately arranged in the Z direction with the dielectric layers 111 interposed therebetween.

[0034] In addition, the capacitor body 110 may include an active region 115 in which first and second internal electrodes are alternately arranged in the Z direction with a dielectric layer 111 sandwiched therebetween as a part that contributes to forming the capacitance of the capacitor, and upper and lower cover regions 112, 113 provided respectively on the upper and lower surfaces of the active region 115 in the Z direction as margin portions.

[0035] The shape of the capacitor body 110 is not particularly limited, but may be a hexahedron and may include first and second surfaces 1, 2 facing each other in the Z direction, third and fourth surfaces 3, 4 connected to the first and second surfaces 1, 2 and facing each other in the X direction, and fifth and sixth surfaces 5, 6 connected to the first and second surfaces 1, 2, connected to the third and fourth surfaces 3, 4, and facing each other. In this case, the first surface 1 may be a mounting surface.

[0036] The dielectric layer 111 may include a ceramic powder, such as a BaTiO3-based ceramic powder.

[0037] In addition, the BaTiO3 ceramic powder is a powder in which Ca, Zr, etc. are partially dissolved in BaTiO3 (Ba 1-x Ca x )TiO3, Ba(Ti 1-y Ca y )O3, (Ba 1-x Ca x )(Ti 1-y Zr y )O3 or Ba(Ti 1-y Zr y )O3, but the present invention is not limited to these.

[0038] In addition to the ceramic powder, the dielectric layer 111 may further contain a ceramic additive, an organic solvent, a plasticizer, a binder, a dispersant, and the like.

[0039] The ceramic additives can include, for example, transition metal oxides or carbides, rare earth elements, magnesium (Mg), or aluminum (Al), and the like.

[0040] In this case, the average thickness C of the dielectric layer 111 may exceed 0.5 μm.

[0041] If the average thickness of the dielectric layer 111 is 0.5 μm or less, a problem of a decrease in BDV (breakdown voltage) may occur.

[0042] The first and second internal electrodes 121, 122 are electrodes to which different polarities are applied, and may be formed on the dielectric layer 111 and stacked in the Z direction, and may be alternately arranged to face each other along the Z direction inside the capacitor body 110 with one dielectric layer 111 sandwiched therebetween.

[0043] In this case, the first and second internal electrodes 121 and 122 may be electrically insulated from each other by the dielectric layer 111 disposed therebetween.

[0044] In addition, the first internal electrode 121 can be exposed to the third surface 3 of the dielectric layer 111 .

[0045] The second internal electrode 122 can be exposed to the fourth face 4 of the dielectric layer 111 .

[0046] In this case, the ends of the first and second internal electrodes 121, 122 alternately exposed to the third and fourth surfaces 3, 4 of the capacitor body 110 may be electrically connected to the first and second external electrodes 131, 132 disposed at both ends of the capacitor body 110 in the X direction, which will be described later.

[0047] With the above-mentioned configuration, when a predetermined voltage is applied to the first and second external electrodes 131 and 132, charges are accumulated between the first and second internal electrodes 121 and 122.

[0048] At this time, the capacitance of the multilayer capacitor 100 is proportional to the overlapping area of ​​the first and second internal electrodes 121 and 122 that overlap each other in the active region 115 along the Z direction.

[0049] Here, the material for forming the first and second internal electrodes 121 and 122 is not particularly limited, but may be formed using a conductive paste made of one or more of precious metal materials, nickel (Ni), and copper (Cu).

[0050] The conductive paste may be printed by screen printing, gravure printing, or the like, but the present invention is not limited to this method.

[0051] Furthermore, the first and second internal electrodes 121, 122 may have an average thickness D of 0.4 μm or less.

[0052] If the average thickness of the first and second internal electrodes 121, 122 exceeds 0.4 μm, the thickness of the capacitor body 110 becomes large, which may cause a disadvantage in achieving high capacitance in a small-sized multilayer capacitor.

[0053] Voltages of different polarities are supplied to the first and second external electrodes 131, 132, and the first and second external electrodes 131, 132 are disposed at both ends of the body 110 in the X direction and may be electrically connected to the portions of the first and second internal electrodes 121, 122 exposed to the third and fourth surfaces 3, 4 of the capacitor body 110, respectively.

[0054] The first external electrode 131 may include a first connection portion 131a and a first band portion 131b.

[0055] The first connection portion 131a is arranged on the third surface 3 of the capacitor body 110 and contacts the end of the first internal electrode 121 that is exposed to the outside on the third surface 3 of the capacitor body 110, thereby serving to physically and electrically connect the first internal electrode 121 and the first external electrode 131 to each other.

[0056] The first band portion 131b is a portion that extends from the first connection portion 131a to a part of the first surface 1 of the capacitor body 110.

[0057] In this case, the first band portion 131b may be further extended to the second, fifth and sixth faces 2, 5 and 6 of the capacitor body 110 in order to improve the fixing strength, if necessary.

[0058] The second external electrode 132 may include a second connection portion 132a and a second band portion 132b.

[0059] The second connection portion 132a is arranged on the fourth surface 4 of the capacitor body 110 and contacts the end of the second internal electrode 122 that is exposed to the outside on the fourth surface 4 of the capacitor body 110, thereby serving to physically and electrically connect the second internal electrode 122 and the second external electrode 132 to each other.

[0060] The second band portion 132 b is a portion that extends from the second connection portion 132 a to a part of the first surface 1 of the capacitor body 110 .

[0061] In this case, the second band portion 132b may be further extended to the second, fifth and sixth faces 2, 5 and 6 of the capacitor body 110 in order to improve the fixing strength, if necessary.

[0062] In this embodiment, when the dielectric constant of the active region 115 and the dielectric constant of the second and fourth regions of the capacitor body 110 are defined as A, and the dielectric constant of the first region and the dielectric constant of the third region of the capacitor body 110 are defined as B, B / A satisfies 0.5≦B / A.

[0063] In this case, B / A more preferably satisfies 0.937≦B / A.

[0064] In addition, when the average thickness of the dielectric layer 111 is defined as C, the average thickness of the first or second internal electrode 121, 122 is defined as D, and the average width of the first or third region is defined as E, C≦E and D≦E can be satisfied.

[0065] In this case, if the average width E of the first region or the third region is smaller than the average thickness C of the dielectric layer 111, the fringing field will cause large electric field distortion, which may result in a problem of increased probability of dielectric breakdown in the widthwise margins and the upper and lower cover regions 112, 113.

[0066] In addition, if the average width E of the first region or the third region is smaller than the average thickness D of the first or second internal electrode 121, 122, the fringing field will increase the electric field distortion phenomenon, which may result in a problem of increased probability of dielectric breakdown in the widthwise margins and the upper and lower cover regions 112, 113.

[0067] Additionally, the grain size of the active region 115 and the second and fourth regions may be larger than the grain size of the first and third regions.

[0068] If the medium is non-magnetic, electromagnetic waves can propagate at the interface between a medium with a large dielectric constant and a medium with a small dielectric constant, inversely proportional to the square of the dielectric constant.

[0069] When the potential pattern at the tip of the internal electrode of the multilayer capacitor is examined, the potential pattern is a pattern that is radiated to the outside of the multilayer capacitor, and this pattern is bent at the boundary surface to the side with the larger dielectric constant.

[0070] Due to this refraction relationship, the electric field becomes stronger in some places and weaker in others. The average electric field value at the tip of the internal electrode, especially at the interface in the Y direction and Z direction where the active region and the margin part meet, becomes smaller as the difference in dielectric constant increases.

[0071] The active region is a portion that realizes the electrical characteristics of the multilayer capacitor, and the width margin and the upper and lower cover regions are portions that are not related to the formation of capacitance.

[0072] Therefore, the stacked capacitor of this embodiment is configured such that the dielectric constant of the active region that realizes the effective capacitance is made different from that of the margin region that is not significantly related to the electrical characteristics, and the difference between the dielectric constant A of the active region and the second and fourth regions outside the margin region, and the dielectric constant B of the first and third regions inside the margin region, satisfies 0.5≦B / A.

[0073] In order to make the difference in the dielectric constant between A and B different in this manner, the composition of the dielectric in the portion of the active region where the internal electrodes are arranged is made different from the composition of the dielectric constituting the inner portion of the widthwise margin portion and the inner portion of the cover region in the active region.

[0074] For example, a dielectric constant difference can be generated by adjusting the content of the minor component contained in the dielectric constituting the portion in the active region where the internal electrode is arranged, and the content of the minor component contained in the dielectric constituting the inner portion of the widthwise margin portion in the active region and the inner portion of the cover region.

[0075] The content of the subcomponents contained in the dielectric constituting the outer portion of the widthwise margin in the active region and the outer portion in the cover region can be made roughly the same as that in the portion in the active region where the internal electrodes are arranged, thereby generating a dielectric constant difference.

[0076] Dielectric breakdown, which is one of the major defects in multilayer capacitors, is caused by an electric field concentrated at the tips of the internal electrodes.

[0077] According to this embodiment, by satisfying 0.5≦B / A, the decrease in capacitance of the multilayer capacitor can be minimized, and the electric field at the interface near the tip of the internal electrode can be dispersed to improve the electric field concentration phenomenon.

[0078] This makes it possible to prevent dielectric breakdown of the multilayer capacitor, thereby improving the reliability of the multilayer capacitor.

[0079] Figure 5 shows the average electric field measured using Ansys Maxwell 2D Simulation in relation to changes in the B / A value of a multilayer capacitor.

[0080] In this case, the dielectric constant A of the active region and the second and fourth regions of the stacked capacitor was set to 3000, and the dielectric constant B of the first and third regions was changed to adjust B / A, and the size of the average electric field at the tip of the internal electrode in the stacked capacitor was confirmed.

[0081] Referring to FIG. 5, it can be seen that as the B / A value increases, the average electric field value of the stacked capacitor decreases exponentially.

[0082] In this case, when the dielectric constant A of the active region and the second and fourth regions and the dielectric constant B of the first and second regions are the same, that is, B / A is 1.0, it can be seen that the dielectric constant is increased by only about 3% compared to when B / A is 0.5.

[0083] Table 1 below shows the failure rate measured according to the change in B / A through a voltage test.

[0084] In this case, B / A was determined by changing experimental conditions such as material bonding and firing conditions, and molar ratio, and the dielectric constants of A and B were measured by back-calculation through basic experiments to confirm the relationship between the measured capacitance, the molar ratio at the time of measurement, and the crystal grain size.

[0085] [Table 1]

[0086] Referring to Table 1, when the B / A value was less than 0.5, the defect rate in the tip electric field of the internal electrode was very high, about 70%.

[0087] In addition, it can be seen that from #2, where the B / A value is 0.5 or more, the defect rate falls to less than 10%, and in the cases of #4 and #5, where the B / A value is 0.937 or more, the defect rate is 0, meaning that no defects occur at all.

[0088] Therefore, the range of the B / A value in which the electric field defect is favorable can be set preferably to 0.5 or more, and more preferably to 0.937 or more.

[0089] Referring to FIG. 6, the mounting substrate for the multilayer capacitor according to this embodiment includes a substrate 210 having a first electrode pad 221 and a second electrode pad 222 on one surface, and a multilayer capacitor 100 mounted on the upper surface of the substrate 210 such that first and second external electrodes 131, 132 are connected to the first electrode pad 221 and the second electrode pad 222, respectively.

[0090] In this embodiment, the stacked capacitor 100 is illustrated and described as being mounted on the substrate 210 by solders 231, 232, but a conductive paste can be used instead of solder if necessary.

[0091] 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. [Item 1] a capacitor body including a dielectric layer and a first internal electrode and a second internal electrode, the capacitor body including a first surface and a second surface facing each other, a third surface and a fourth surface connected to the first surface and the second surface and facing each other, a fifth surface and a sixth surface connected to the first surface and the second surface and connected to the third surface and the fourth surface and facing each other, the first internal electrode being exposed to the third surface and the second internal electrode being exposed to the fourth surface; a first external electrode and a second external electrode disposed on the third surface and the fourth surface of the capacitor body, respectively, and connected to the first internal electrode and the second internal electrode, the capacitor body includes an active region in which the first internal electrodes and the second internal electrodes are alternately arranged with the dielectric layer interposed therebetween, and an upper cover region and a lower cover region respectively provided on upper and lower surfaces of the active region in a lamination direction, a width margin is formed on both sides of the active region in a direction connecting the fifth surface and the sixth surface, the width margin being divided into an inner first region and an outer second region, and the upper cover region and the lower cover region being divided into an inner third region and an outer fourth region; the active region, the second region, and the fourth region have the same dielectric constant, and the first region and the third region have the same dielectric constant; A multilayer capacitor, wherein when the dielectric constant of the active region, the dielectric constant of the second region, and the dielectric constant of the fourth region are defined as A, and the dielectric constant of the first region and the dielectric constant of the third region are defined as B, 0.5≦B / A is satisfied. [Item 2] 2. The multilayer capacitor according to item 1, wherein B / A is 0.937 or less. [Item 3] 3. The multilayer capacitor according to item 1 or 2, wherein, when an average thickness of the dielectric layer is defined as C, an average thickness of the first internal electrode or the second internal electrode is defined as D, and an average width of the first region or the third region is defined as E, C≦E and D≦E are satisfied. [Item 4] 4. The multilayer capacitor according to any one of items 1 to 3, wherein the active region, the second region, and the fourth region have a larger grain size than the first region and the third region. [Item 5] 5. The multilayer capacitor according to any one of items 1 to 4, wherein the first internal electrodes and the second internal electrodes have an average thickness of 0.4 μm or less. [Item 6] 6. The multilayer capacitor according to any one of claims 1 to 5, wherein the average thickness of the dielectric layers is greater than 0.5 μm. [Item 7] The first external electrode and the second external electrode are a first connection portion and a second connection portion disposed on the third surface and the fourth surface of the capacitor body, respectively, and connected to the first internal electrode and the second internal electrode, respectively; 7. The multilayer capacitor according to any one of items 1 to 6, further comprising: a first band portion and a second band portion extending from the first connection portion and the second connection portion, respectively, to a portion of the first surface of the capacitor body. [Item 8] a substrate having a first electrode pad and a second electrode pad on one surface; a capacitor body including a dielectric layer and a first internal electrode and a second internal electrode, the capacitor body including first and second surfaces facing each other, third and fourth surfaces connected to the first and second surfaces and facing each other, fifth and sixth surfaces connected to the first and second surfaces and connected to the third and fourth surfaces and facing each other, the first internal electrode being exposed to the third surface and the second internal electrode being exposed to the fourth surface; and first and second external electrodes disposed on the third and fourth surfaces of the capacitor body, respectively, and connected to the first and second internal electrodes, respectively. The capacitor body includes an active region in which the first internal electrodes and the second internal electrodes are alternately disposed with the dielectric layer interposed therebetween; an upper cover region and a lower cover region respectively provided on an upper surface and an lower surface in a lamination direction of an active region, wherein a width margin is formed on both sides of the active region in a direction connecting the fifth surface and the sixth surface, the width margin being divided into an inner first region and an outer second region, and the upper cover region and the lower cover region being divided into an inner third region and an outer fourth region, the active region, the second region, and the fourth region having the same dielectric constant, the first region and the third region having the same dielectric constant, and wherein, when the dielectric constant of the active region, the dielectric constant of the second region, and the dielectric constant of the fourth region are defined as A, and the dielectric constant of the first region and the dielectric constant of the third region are defined as B, a multilayer capacitor satisfying 0.5≦B / A, a mounting board mounted so that the first external electrode and the second external electrode are connected to the first electrode pad and the second electrode pad, respectively; [Item 9] 9. The mounting board according to item 8, wherein the multilayer capacitor has a B / A ratio of 0.937 or less. [Item 10] 10. The mounting board according to item 8 or 9, wherein, when an average thickness of the dielectric layer is defined as C, an average thickness of the first internal electrode or the second internal electrode is defined as D, and an average width of the first region or the third region is defined as E, the stacked capacitor satisfies C≦E and D≦E. [Item 11] 11. The mounting substrate according to any one of items 8 to 10, wherein in the stacked capacitor, the grain sizes of the active region, the second region, and the fourth region are larger than the grain sizes of the first region and the third region. [Item 12] 12. The mounting board according to any one of items 8 to 11, wherein the average thickness of the first internal electrode and the second internal electrode of the multilayer capacitor is 0.4 μm or less. [Item 13] 13. The mounting board according to any one of items 8 to 12, wherein the average thickness of the dielectric layer of the multilayer capacitor exceeds 0.5 μm. [Item 14] The multilayer capacitor has the first external electrode and the second external electrode, a first connection portion and a second connection portion disposed on the third surface and the fourth surface of the capacitor body, respectively, and connected to the first internal electrode and the second internal electrode, respectively; 14. The mounting board according to any one of items 8 to 13, further comprising: a first band portion and a second band portion extending from the first connection portion and the second connection portion, respectively, to a part of the first surface of the capacitor body. [Explanation of symbols]

[0092] 100 Stacked Capacitor 110 Capacitor body 111 Dielectric layer 112, 113 Upper and lower cover areas 115 Active region 121 1st internal electrode 122 2nd internal electrode 131 1st external electrode 132 2nd external electrode 131a First connection part 132a Second connection part 131b 1st Band 132b 2nd Band 210 Substrate 221 First electrode pad 222 Second electrode pad 231, 232 Solder

Claims

1. a capacitor body including a dielectric layer, and first and second internal electrodes alternately disposed with the dielectric layer therebetween, the capacitor body including first and second surfaces opposed to each other, third and fourth surfaces connected to the first and second surfaces and opposed to each other, fifth and sixth surfaces connected to the first and second surfaces and connected to the third and fourth surfaces and opposed to each other, the first internal electrodes being exposed to the third surfaces and the second internal electrodes being exposed to the fourth surfaces; a first external electrode and a second external electrode disposed on the third surface and the fourth surface of the capacitor body, respectively, and connected to the first internal electrode and the second internal electrode, the capacitor body further includes an active region in which the first internal electrodes and the second internal electrodes are alternately arranged with the dielectric layer interposed therebetween, and an upper cover region and a lower cover region provided above an uppermost internal electrode and below a lowermost internal electrode in a lamination direction of the first internal electrodes and the second internal electrodes, respectively; a width margin of the capacitor body is disposed on both sides of the active region in a direction connecting the fifth surface and the sixth surface, where the first internal electrode and the second internal electrode are not present, the width margin includes a first region adjacent to the first internal electrode and the second internal electrode and a second region disposed outside between the first region and an outer surface of the capacitor body, and the upper cover region and the lower cover region each include a third region adjacent to the first internal electrode and the second internal electrode and a fourth region disposed outside between the third region and the capacitor body, the active region, the second region, and the fourth region have the same dielectric constant A, and the first region and the third region have the same dielectric constant B; A multilayer capacitor, in which A and B are different from each other and satisfy 0.937≦B / A.

2. 2. The multilayer capacitor according to claim 1, wherein, when an average thickness of the dielectric layer is defined as C, an average thickness of the first internal electrode or the second internal electrode is defined as D, and an average width of the first region or the third region is defined as E, C≦E and D≦E are satisfied.

3. 3. The multilayer capacitor according to claim 1, wherein the crystal grain sizes of the active region, the second region, and the fourth region are larger than the crystal grain sizes of the first region and the third region.

4. 4. The multilayer capacitor according to claim 1, wherein the first internal electrodes and the second internal electrodes have an average thickness of 0.4 [mu]m or less.

5. The multilayer capacitor according to claim 1 , wherein the average thickness of the dielectric layers is greater than 0.5 μm.

6. The first external electrode and the second external electrode are a first connection portion and a second connection portion disposed on the third surface and the fourth surface of the capacitor body, respectively, and connected to the first internal electrode and the second internal electrode, respectively; 6. The multilayer capacitor according to claim 1, further comprising: a first band portion and a second band portion extending from the first connection portion and the second connection portion, respectively, to a portion of the first surface of the capacitor body.

7. a capacitor body including internal electrodes including first and second internal electrodes that include a dielectric layer and are alternately arranged with a dielectric layer therebetween; a first external electrode and a second external electrode disposed on outer surfaces of both ends in a longitudinal direction of the capacitor body and connected to the first internal electrode and the second internal electrode, respectively; a dielectric constant B of the capacitor body in an inner region between the internal electrodes and outer surfaces at both ends of the capacitor body in the thickness direction and width direction is different from a dielectric constant A of the capacitor body in an outer region between the internal region and the outer surface of the capacitor body and an active region in which the first internal electrodes and the second internal electrodes are alternately arranged with the dielectric layer therebetween, A multilayer capacitor, wherein, when the average thickness of the dielectric layer is defined as C and the average width of the inner region is defined as E, C and E exceed 0.5 μm.

8. A capacitor body having internal electrodes including a first internal electrode and a second internal electrode, the first internal electrode and the second internal electrode being alternately arranged with a dielectric layer therebetween; a first external electrode and a second external electrode disposed on outer surfaces of both ends in a longitudinal direction of the capacitor body and connected to the first internal electrode and the second internal electrode, respectively; a dielectric constant B of the capacitor body in an inner region disposed between an internal electrode and outer surfaces at both ends of the capacitor body in a thickness direction and a width direction is different from a dielectric constant A of the capacitor body in an outer region disposed between the inner region and the outer surface of the capacitor body; When the average thickness of the dielectric layer is defined as C and the average width of the inner region is defined as E, C and E are greater than 0.5 μm; the capacitor body includes an active region in which the first internal electrodes and the second internal electrodes are alternately arranged with the dielectric layer interposed therebetween; A stacked capacitor, wherein the grain size of the active region and the outer region is larger than the grain size of the inner region.

9. 9. The multilayer capacitor according to claim 7, wherein, when an average thickness of the first internal electrode or the second internal electrode is defined as D, C≦E and D≦E are satisfied.

10. 10. The multilayer capacitor according to claim 7, wherein the first internal electrodes and the second internal electrodes have an average thickness of 0.4 [mu]m or less.

11. The first external electrode and the second external electrode are a first connection portion and a second connection portion disposed on a third surface and a fourth surface of the capacitor body, respectively, and connected to the first internal electrode and the second internal electrode, 11. The multilayer capacitor according to claim 7, further comprising: a first band portion and a second band portion extending from the first connection portion and the second connection portion, respectively, to a portion of the first surface of the capacitor body.

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