Patent Publication Number: US-11049656-B2

Title: Multilayer ceramic capacitor and method of manufacturing the same

Description:
CROSS-REFERENCE TO RELATED APPLICATION(S) 
     This application is a continuation of U.S. patent application Ser. No. 16/175,764, filed on Oct. 30, 2018, which claims benefit of priority to Korean Patent Application No. 10-2018-0102123 filed on Aug. 29, 2018 in the Korean Intellectual Property Office, the disclosure of which is incorporated herein by reference in its entirety. 
    
    
     TECHNICAL FIELD 
     The present disclosure relates to a multilayer ceramic capacitor capable of having improved moistureproof reliability by controlling a thickness of a side margin portion disposed on a side surface of a ceramic body to prevent the permeation of moisture, and a method of manufacturing the same. 
     BACKGROUND 
     Generally, electronic components using a ceramic material, such as a capacitor, an inductor, a piezoelectric element, a varistor, a thermistor, and the like, include a ceramic body formed of the ceramic material, internal electrodes formed in the ceramic body, and external electrodes disposed on surfaces of the ceramic body to be connected to the internal electrodes. 
     Recently, in accordance with miniaturization and multi-functionalization of electronic products, multilayer ceramic electronic components also tend to be miniaturized and multi-functionalized. Therefore, a multilayer ceramic capacitor having a small size and a high capacitance has been demanded. 
     In order to miniaturize the multilayer ceramic capacitor and increase a capacitance of the multilayer ceramic capacitor, it has been required to significantly increase an electrode effective area (increase an effective volume fraction required for implementing a capacitance). 
     In order to implement the miniature and high-capacitance multilayer ceramic capacitor as described above, in manufacturing the multilayer ceramic capacitor, a method of significantly increasing areas of internal electrodes in a width direction of a body through a design that does not have a margin by exposing the internal electrodes in the width direction of the body and completing the multilayer ceramic capacitor by separately attaching side margin portions to electrode exposed surfaces of the multilayer ceramic capacitor in the width direction in a process before sintering after the multilayer ceramic capacitor is manufactured has been used. 
     However, in such a method, in a process of forming the side margin portion, when a thickness of the side margin portion is excessively low, moisture may permeate into the body, such that moistureproof reliability may be decreased. 
     Therefore, research into technology capable of improving moistureproof reliability of a subminiature and high-capacitance multilayer ceramic capacitor has been required. 
     SUMMARY 
     An aspect of the present disclosure may provide a multilayer ceramic capacitor capable of having improved moistureproof reliability by controlling a thickness of a side margin portion disposed on a side surface of a ceramic body to prevent permeation of moisture, and a method of manufacturing the same. 
     According to an aspect of the present disclosure, a multilayer ceramic capacitor may include: a ceramic body including dielectric layers and having first and second surfaces opposing each other, third and fourth surfaces connecting the first and second surfaces to each other, and fifth and sixth surfaces connected to the first to fourth surfaces and opposing each other; a plurality of internal electrodes disposed in the ceramic body, exposed to the first and second surfaces, and having one ends exposed to the third or fourth surface; and a first side margin portion and a second side margin portion disposed, respectively, on side portions of the internal electrodes exposed to the first and second surfaces. A thickness of each of the first and second side margin portions may be 10 μm or more and less than 45 μm. 
     According to another aspect of the present disclosure, a method of manufacturing a multilayer ceramic capacitor may include: preparing first ceramic green sheets on which a plurality of first internal electrodes patterns are formed at predetermined intervals and second ceramic green sheets on which a plurality of second internal electrodes patterns are formed at predetermined intervals; forming a ceramic green sheet multilayer body by stacking the first and second ceramic green sheets so that the first internal electrodes patterns and the second internal electrodes patterns intersect each other; cutting the ceramic green sheet multilayer body to have side surfaces on which distal ends of the first internal electrodes patterns and the second internal electrodes patterns are exposed in a width direction; forming a first side margin portion and a second side margin portion, respectively, on the side surfaces to which the distal ends of the first internal electrodes patterns and the second internal electrodes patterns are exposed; and preparing a ceramic body including dielectric layers and internal electrodes by sintering the cut ceramic green sheet multilayer body. A thickness of each of the first and second side margin portions may be 10 μm or more and less than 45 μm. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
       The above and other aspects, features, and advantages of the present disclosure will be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings, in which: 
         FIG. 1  is a schematic perspective view illustrating a multilayer ceramic capacitor according to an exemplary embodiment in the present disclosure; 
         FIG. 2  is a perspective view illustrating an appearance of a ceramic body of  FIG. 1 ; 
         FIG. 3  is a perspective view illustrating a ceramic green sheet multilayer body before the ceramic body of  FIG. 2  is sintered; 
         FIG. 4  is a side view when viewed in direction B of  FIG. 2 ; and 
         FIGS. 5A through 5F  are schematic cross-sectional views and schematic perspective views illustrating a method of manufacturing a multilayer ceramic capacitor according to another exemplary embodiment in the present disclosure. 
     
    
    
     DETAILED DESCRIPTION 
     Hereinafter, exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. 
       FIG. 1  is a schematic perspective view illustrating a multilayer ceramic capacitor according to an exemplary embodiment in the present disclosure. 
       FIG. 2  is a perspective view illustrating an appearance of a ceramic body of  FIG. 1 . 
       FIG. 3  is a perspective view illustrating a ceramic green sheet multilayer body before the ceramic body of  FIG. 2  is sintered. 
       FIG. 4  is a side view when viewed in direction B of  FIG. 2 . 
     Referring to  FIGS. 1 through 4 , a multilayer ceramic capacitor  100  according to the present exemplary embodiment may include a ceramic body  110 , a plurality of internal electrodes  121  and  122  formed in the ceramic body  110 , and external electrodes  131  and  132  formed on outer surfaces of the ceramic body  110 . 
     The ceramic body  110  may have first and second surfaces  1  and  2  opposing each other, third and fourth surfaces  3  and  4  connecting the first and second surfaces to each other, and fifth and sixth surfaces  5  and  6 , which are upper and lower surfaces, respectively. 
     The first and second surfaces  1  and  2  refer to surfaces of the ceramic body  110  opposing each other in a width direction W, which is a second direction, the third and fourth surfaces  3  and  4  refer to surfaces of the ceramic body  110  opposing each other in a length direction L, which is a first direction, and the fifth and sixth surfaces  5  and  6  refer to surfaces of the ceramic body  110  opposing each other in a thickness direction T, which is a third direction. 
     A shape of the ceramic body  110  is not particularly limited, but may be a rectangular parallelepiped shape as illustrated. 
     One ends of the plurality of internal electrodes  121  and  122  formed in the ceramic body  110  may be exposed to the third surface  3  or the fourth surface  4  of the ceramic body. 
     The internal electrodes  121  and  122  may have a pair of first and second internal electrodes  121  and  122  having different polarities. 
     One ends of the first internal electrodes  121  may be exposed to the third surface  3 , and one ends of the second internal electrodes  122  may be exposed to the fourth surface  4 . 
     The other ends of the first internal electrodes  121  may be spaced apart from the fourth surface  4  by a predetermined interval. The other ends of the second internal electrodes  122  may be spaced apart from the third surface  3  by a predetermined interval. 
     First and second external electrodes  131  and  132  may be formed on the third and fourth surfaces  3  and  4  of the ceramic body, respectively, and may be electrically connected to the internal electrodes. 
     The multilayer ceramic capacitor  100  according to an exemplary embodiment in the present disclosure may include the plurality of internal electrodes  121  and  122  disposed in the ceramic body  110 , exposed to the first and second surfaces  1  and  2 , and having one ends exposed to the third surface  3  or the fourth surface  4 , and first and second side margin portions  112  and  113  disposed on side portions of the internal electrodes  121  and  122  exposed to the first and second surfaces  1  and  2 , respectively. 
     The plurality of internal electrodes  121  and  122  may be formed in the ceramic body  110 , the respective side portions of the plurality of internal electrodes  121  and  122  may be exposed to the first and second surfaces  1  and  2 , which are surfaces of the ceramic body  110  in the width direction, and the first and second side margin portions  112  and  113  may be disposed on the exposed side portions. 
     An average thickness tc of each of the first and second side margin portions  112  and  113  may be 10 μm or more and less than 45 μm. 
     According to an exemplary embodiment in the present disclosure, the ceramic body  110  may include a laminate in which a plurality of dielectric layers  111  are stacked and the first and second side margin portions  112  and  113  disposed on opposite side surfaces of the laminate, respectively. 
     The plurality of dielectric layers  111  may be in a sintered state, and adjacent dielectric layers may be integrated with each other so that boundaries therebetween are not readily apparent. 
     A length of the ceramic body  110  may correspond to a distance from the third surface  3  of the ceramic body to the fourth surface  4  of the ceramic body. 
     A length of the dielectric layer  111  may form a distance between the third and fourth surfaces  3  and  4  of the ceramic body. 
     According to an exemplary embodiment in the present disclosure, the length of the ceramic body may be 400 to 1400 μm, but is not limited thereto. More specifically, the length of the ceramic body may be 400 to 800 μm or may be 600 to 1400 μm. 
     The internal electrodes  121  and  122  may be formed on the dielectric layers  111 , and the internal electrodes  121  and  122  may be formed in the ceramic body with each of the dielectric layers interposed therebetween, by sintering. 
     Referring to  FIG. 3 , the first internal electrodes  121  may be formed on the dielectric layers  111 . The first internal electrodes  121  may not be entirely formed on the dielectric layers in the length direction of the dielectric layers. That is, one end of the first internal electrode  121  may be formed up to the third surface  3  to be exposed to the third surface  3 , and the other end of the first internal electrode  121  may be formed to be spaced apart from the fourth surface of the ceramic body by a predetermined interval. 
     The end portion of the first internal electrode exposed to the third surface  3  of the ceramic body may be connected to the first external electrode  131 . 
     On the contrary to the first internal electrode, one end of the second internal electrode  122  may be exposed to the fourth surface  4  to be connected to the second external electrode  132 , and the other end of the second internal electrode  122  may be formed to be spaced apart from the third surface  3  by a predetermined interval. 
     Four hundred or more internal electrodes may be stacked in order to implement a high-capacitance multilayer ceramic capacitor, but the number of internal electrodes is not necessarily limited thereto. 
     The dielectric layer  111  may have the same width as that of the first internal electrode  121 . That is, the first internal electrodes  121  may be entirely formed on the dielectric layers in the width direction of the dielectric layers  111 . The dielectric layer  111  may have the same width as that of the second internal electrode  122 . That is, the second internal electrodes  122  may be entirely formed on the dielectric layers in the width direction of the dielectric layers  111 . 
     According to an exemplary embodiment in the present disclosure, the width of the dielectric layer and the width of the internal electrode may be 100 to 900 μm, but are not limited thereto. More specifically, the width of the dielectric layer and the width of the internal electrode may be 100 to 500 μm or may be 100 to 900 μm. 
     As the ceramic body is miniaturized, a thickness of each of the side margin portions may have an influence on electrical characteristics of the multilayer ceramic capacitor. According to an exemplary embodiment in the present disclosure, each of the side margin portions may be formed at a thickness less than 45 μm, such that moistureproof characteristics and other electrical characteristics of a miniaturized multilayer ceramic capacitor may be improved. 
     That is, each of the side margin portions may be formed at the thickness less than 45 μm, such that an overlapping area between the internal electrodes forming a capacitance may be secured as much as possible to implement a high-capacitance and miniature multilayer ceramic capacitor. In addition, each of the side margin portions may be formed at the thickness less than 45 μm, such that permeation of moisture into the ceramic body may be prevented to improve moistureproof reliability of the multilayer ceramic capacitor. 
     The ceramic body  110  may include an active portion A contributing to forming a capacitance of a capacitor, and upper and lower cover portions  114  and  115  formed as upper and lower margin portions on upper and lower surfaces of the active portion A, respectively. 
     The active portion A may be formed by repeatedly stacking a plurality of first and second internal electrodes  121  and  122  with each of the dielectric layers  111  interposed therebetween. 
     The upper and lower cover portions  114  and  115  may be formed of the same material as that of the dielectric layer  111  and have the same configuration as that of the dielectric layer  111  except that they do not include the internal electrodes. 
     That is, the upper and lower cover portions  114  and  115  may include a ceramic material such as a barium titanate (BaTiO 3 )-based ceramic material. 
     Each of the upper and lower cover portions  114  and  115  may have a thickness of 20 μm or less, but is not necessarily limited thereto. 
     In an exemplary embodiment in the present disclosure, the internal electrodes and the dielectric layers, which are simultaneously cut and formed, may be formed at the same width. More detailed contents for this will be described below. 
     In the present exemplary embodiment, the dielectric layers may be formed at the same width as that of the internal electrodes, and the side portions of the internal electrodes  121  and  122  may thus be exposed to the first and second surfaces of the ceramic body  110  in the width direction. 
     The first and second side margin portions  112  and  113  may be formed, respectively, on opposite side surfaces of the ceramic body  110  in the width direction to which the side portions of the internal electrodes  121  and  122  are exposed. 
     Each of the first and second side margin portions  112  and  113  may have the thickness less than 45 μm. The smaller the thickness of each of the first and second side margin portions  112  and  113 , the greater the overlapping area between the internal electrodes formed in the ceramic body. 
     The thickness of each of the first and second side margin portions  112  and  113  is not particularly limited as long as a short-circuit between the internal electrodes exposed to the side surfaces of the ceramic body may be prevented, and may be, for example, 10 μm or more. 
     When the thickness of each of the first and second side margin portions  112  and  113  is 10 μm, a moisture permeability rate may be substantially 0. 
     When the thickness of each of the first and second side margin portions  112  and  113  is less than 10 μm, the thickness of each of the first and second side margin portions  112  and  113  may be small, such that moisture may permeate into the ceramic body through the side margin portions to decrease the moistureproof reliability. 
     Meanwhile, when the thickness of each of the first and second side margin portions  112  and  113  is 45 μm or more, the overlapping area between the internal electrodes may be relatively decreased, such that it may be difficult to secure a high capacitance of the multilayer ceramic capacitor. 
     In addition, sintering may not be sufficiently performed at the same sintering temperature in a case in which the thickness of each of the first and second side margin portions  112  and  113  is 45 μm or more as compared to a case in which when the thickness of each of the first and second side margin portions  112  and  113  is less than 45 μm, such that pores may be generated in a surface of each of the first and second side margin portions  112  and  113  to increase a surface moisture absorptivity. Therefore, moistureproof reliability may be decreased. 
     In order to significantly increase a capacitance of the multilayer ceramic capacitor, a method of decreasing a thickness of each of the dielectric layers, a method of increasing the number of stacked dielectric layers each of which a thickness is decreased, a method of increasing a coverage of each of the internal electrodes, and the like, have been considered. 
     In addition, a method of increasing the overlapping area between the internal electrodes forming the capacitance has been considered. 
     In order to increase the overlapping area between the internal electrodes, a margin portion region in which the internal electrodes are not formed needs to be significantly decreased. 
     Particularly, as the multilayer ceramic capacitor is miniaturized, the margin portion region needs to be significantly decreased in order to increase the overlapping area between the internal electrodes. 
     Generally, as the number of stacked dielectric layers is increased, thicknesses of the dielectric layers and the internal electrodes may be decreased. Therefore, a phenomenon in which the internal electrodes are short-circuited may frequently occur. In addition, when the internal electrodes are formed on only portions of the dielectric layers, a step due to the internal electrodes may be generated, such that an insulation resistance or reliability of the multilayer ceramic capacitor may be decreased. 
     However, according to the present exemplary embodiment, even though the internal electrodes and the dielectric layers formed of thin films are formed, the internal electrodes may be entirely formed on the dielectric layers in the width direction of the dielectric layers, and the overlapping area between the internal electrodes may thus be increased, such that the capacitance of the multilayer ceramic capacitor may be increased. 
     In addition, the step due to the internal electrodes may be decreased, such that the insulation resistance may be improved, and a multilayer ceramic capacitor having excellent capacitance characteristics and excellent reliability may be provided. 
     According to the present exemplary embodiment, the internal electrodes may be formed over the entirety of the dielectric layers in the width direction of the dielectric layers, and each of the side margin portions may be set to 10 μm or more and less than 45 μm, such that the overlapping area between the internal electrodes may be great. 
     Therefore, a subminiature and high-capacitance multilayer ceramic capacitor may be implemented, and moistureproof reliability may also be improved. 
     Particularly, the multilayer ceramic capacitor according to an exemplary embodiment in the present disclosure may be a subminiature and high-capacitance multilayer ceramic capacitor in which a thickness of the dielectric layer  111  is 0.4 μm or less and a thickness of each of the internal electrodes  121  and  122  is 0.4 μm or less. 
     As in an exemplary embodiment in the present disclosure, in a case of the subminiature and high-capacitance multilayer ceramic capacitor in which the dielectric layer  111  and the internal electrodes  121  and  122  formed of thin films having the thickness of 0.4 μm or less are used, a decrease problem in the moistureproof reliability due to permeation of moisture into the side margin portion may be a very important issue. 
     That is, as compared to the multilayer ceramic capacitor according to the related art, technology according an exemplary embodiment in the present disclosure is applied to the subminiature and high-capacitance multilayer ceramic capacitor in which the thickness of the dielectric layer  111  is 0.4 μm or less and the thickness of each of the internal electrodes  121  and  122  is 0.4 μm or less. Therefore, the thicknesses of the dielectric layer and the internal electrodes may be small, resulting in an increase in a possibility that the moistureproof reliability will be decreased due to the permeation of the moisture. 
     However, as in an exemplary embodiment in the present disclosure, in the subminiature and high-capacitance multilayer ceramic capacitor in which the separate side margin portions are attached, the average thickness tc of each of the first and second side margin portions  112  and  113  may be controlled to be 10 μm or more and less than 45 μm, such that the moistureproof reliability may be improved even in a case in which the dielectric layer  111  and the first and second internal electrodes  121  and  122  are formed of the thin films having the thickness of 0.4 μm or less. 
     However, the thin films do not mean that the thicknesses of the dielectric layer  111  and the first and second internal electrodes  121  and  122  are 0.4 μm or less, but may conceptually include that the thicknesses of the dielectric layer and the internal electrodes are smaller than those of the multilayer ceramic capacitor according to the related art. 
     Referring to  FIG. 4 , a ratio of a thickness tc 2  of a region of the first or second side margin portion in contact with a distal end of an internal electrode disposed at the outermost side portion to a thickness tc 1  of a region of the first or second side margin portion in contact with a distal end of an internal electrode disposed in a central portion, among the plurality of internal electrodes  121  and  122 , may be 1.0 or less. 
     A lower limit value of the ratio of the thickness tc 2  of the region of the first or second side margin portion in contact with the distal end of the internal electrode disposed at the outermost side portion to the thickness tc 1  of the region of the first or second side margin portion in contact with the distal end of the internal electrode disposed at the central portion is not particularly limited, and may be 0.9 or more. 
     According to an exemplary embodiment in the present disclosure, the first or second side margin portion may be formed by attaching a ceramic green sheet to the side surface of the ceramic body unlike the related art, and a thickness of the first or second side margin portion at each position may thus be constant. 
     That is, in the related art, the side margin portion is formed in a manner of applying or printing a ceramic slurry, and a deviation of a thickness of the side margin portion at each position is thus large. 
     In detail, in the related art, the thickness of the region of the first or second side margin portion in contact with the distal end of the internal electrode disposed at the central portion of the ceramic body is greater than those of other regions. 
     For example, in the related art, the ratio of the thickness of the region of the first or second side margin portion in contact with the distal end of the internal electrode disposed at the outermost side portion to the thickness of the region of the first or second side margin portion in contact with the distal end of the internal electrode disposed at the central portion is less than about 0.9, such that the deviation of the thickness is large. 
     In the related art in which the deviation of the thickness of the side margin portion at each position is large, a portion occupied by the side margin portion in a multilayer ceramic capacitor having the same size is large, such that a large size of a capacitance forming portion may not be secured, resulting in difficulty in securing a high capacitance. 
     On the other hand, in an exemplary embodiment in the present disclosure, the average thickness tc of each of the first and second side margin portions  112  and  113  may be 10 μm or more and less than 45 μm, and the ratio of the thickness tc 2  of the region of the first or second side margin portion in contact with the distal end of the internal electrode disposed at the outermost side portion to the thickness tc 1  of the region of the first or second side margin portion in contact with the distal end of the internal electrode disposed at the central portion among the plurality of internal electrodes  121  and  122  may be 0.9 or more and 1.0 or less. Therefore, the thickness of the side margin portion may be small and the deviation of the thickness of the side margin portion may be small, such that a large size of the capacitance forming portion may be secured. 
     In an exemplary embodiment in the present disclosure, the first or second side margin portion may be formed by attaching the ceramic green sheet to the side surface of the ceramic body unlike the related art, and the thickness of the first or second side margin portion at each position may thus be constant. 
     Therefore, a high-capacitance multilayer ceramic capacitor may be implemented. 
     Meanwhile, referring to  FIG. 4 , a ratio of a thickness tc 3  of a region of the first or second side margin portion in contact with an edge of the ceramic body  110  to the thickness tc 1  of the region of the first or second side margin portion in contact with the distal end of the internal electrode disposed at the central portion among the plurality of internal electrodes  121  and  122  may be 1.0 or less. 
     A lower limit value of the ratio of the thickness tc 3  of the region of the first or second side margin portion in contact with the edge of the ceramic body  110  to the thickness tc 1  of the region of the first or second side margin portion in contact with the distal end of the internal electrode disposed at the central portion may be 0.9 or more. 
     Due to the feature described above, a deviation of the thickness of the side margin portion in each region may be small, such that the large size of the capacitance forming portion may be secured. Therefore, the high-capacitance multilayer ceramic capacitor may be implemented. 
       FIGS. 5A through 5F  are schematic cross-sectional views and schematic perspective views illustrating a method of manufacturing a multilayer ceramic capacitor according to another exemplary embodiment in the present disclosure. 
     According to another exemplary embodiment in the present disclosure, a method of manufacturing a multilayer ceramic capacitor may include: preparing first ceramic green sheets on which a plurality of first internal electrodes patterns are formed at predetermined intervals and second ceramic green sheets on which a plurality of second internal electrodes patterns are formed at predetermined intervals, forming a ceramic green sheet multilayer body by stacking the first and second ceramic green sheets so that the first internal electrodes patterns and the second internal electrodes patterns overlap with each other, cutting the ceramic green sheet multilayer body to have side surfaces on which distal ends of the first internal electrodes patterns and the second internal electrodes patterns are exposed in a width direction, forming a first side margin portion and a second side margin portion, respectively, on the side surfaces to which the distal ends of the first internal electrodes patterns and the second internal electrodes patterns are exposed, and preparing a ceramic body including dielectric layers and first and second internal electrodes by sintering the cut ceramic green sheet multilayer body. An average thickness tc of each of the first side margin portion  112  and the second side margin portion  113  is 10 μm or more and less than 45 μm. 
     The method of manufacturing a multilayer ceramic capacitor according to another exemplary embodiment in the present disclosure will hereinafter be described. 
     As illustrated in  FIG. 5A , the plurality of first internal electrode patterns  221  having a stripe shape may be formed at the predetermined intervals on the ceramic green sheet  211 . The plurality of first internal electrode patterns  221  having the stripe shape may be formed in parallel with one another. 
     The ceramic green sheet  211  may be formed of a ceramic paste including ceramic powders, an organic solvent, and an organic binder. 
     The ceramic powder, which is a material having a high dielectric constant, may be a barium titanate (BaTiO 3 ) based material, a lead composite perovskite based material, a strontium titanate (SrTiO 3 ) based material, or the like, and may be preferably a barium titanate (BaTiO 3 ) powder, but is not limited thereto. When the ceramic green sheet  211  is sintered, the ceramic green sheet  211  may become a dielectric layer  111  constituting the ceramic body  110 . 
     The first internal electrode patterns  221  having the stripe shape may be formed of an internal electrode paste containing a conductive metal. The conductive metal may be nickel (Ni), copper (Cu), palladium (Pd), or alloys thereof, but is not limited thereto. 
     A method of forming the first internal electrode patterns  221  having the stripe shape on the ceramic green sheet  211  is not particularly limited, but may be a printing method such as a screen printing method or a gravure printing method. 
     In addition, although not illustrated, the plurality of second internal electrode patterns  222  having a stripe shape may be formed at the predetermined intervals interposed therebetween on another ceramic green sheet  211 . 
     Hereinafter, the ceramic green sheet on which the first internal electrode patterns  221  are formed may be referred to as a first ceramic green sheet, and the ceramic green sheet on which the second internal electrode patterns  222  are formed may be referred to as a second ceramic green sheet. 
     Then, as illustrated in  FIG. 5B , the first and second ceramic green sheets may be alternately stacked so that the internal electrode patterns  221  having the stripe shape and the second internal electrode patterns  222  having the stripe shape are alternately stacked. 
     Afterward, the first internal electrode patterns  221  having the stripe shape may become the first internal electrode  121 , and the second internal electrode patterns  222  having the stripe shape may become the second internal electrode  122 . 
     According to another exemplary embodiment in the present disclosure, a thickness td of each of the first and second ceramic green sheets may be 0.6 μm or less, and a thickness te of each of the first and second internal electrode patterns may be 0.5 μm or less. 
     Since the subminiature and high-capacitance multilayer ceramic capacitor in which the dielectric layer and the internal electrodes are formed of the thin films having the thickness of 0.4 μm or less is provided in the present disclosure, the thickness td of each of the first and second ceramic green sheets may be 0.6 μm or less, and the thickness te of each of the first and second internal electrode patterns may be 0.5 μm or less. 
       FIG. 5C  is a cross-sectional view illustrating a ceramic green sheet multilayer body  220  in which the first and second ceramic green sheets are stacked according to another exemplary embodiment in the present disclosure, and  FIG. 5D  is a perspective view illustrating the ceramic green sheet multilayer body  220  in which the first and second ceramic green sheets are stacked. 
     Referring to  FIGS. 5C and 5D , the first ceramic green sheets on which the plurality of first internal electrode patterns  221  parallel with one another and having the stripe shape are printed and the second ceramic green sheets on which the plurality of second internal electrode patterns  222  having parallel with one another and having the stripe shape are printed may be alternately stacked. 
     In more detail, the first ceramic green sheets and the second ceramic green sheets may be stacked so that central portions of the first internal electrode patterns  221  having the stripe shape, printed on the first ceramic green sheets and intervals between the second internal electrode patterns  222  having the stripe shape, printed on the second ceramic green sheets overlap each other. 
     Then, as illustrated in  FIG. 5D , the ceramic green sheet multilayer body  220  may be cut across the plurality of first internal electrode patterns  221  having the stripe shape and the plurality of second internal electrode patterns  222  having the stripe shape. That is, the ceramic green sheet multilayer body  220  may be cut along cut lines C 1 -C 1  and C 2 -C 2  intersecting with each other to become multilayer bodies  210 . 
     In more detail, the first internal electrode patterns  221  having the stripe shape and the second internal electrode patterns  222  having the stripe shape may be cut in the length direction to be divided into a plurality of internal electrodes having a predetermined width. In this case, the stacked ceramic green sheets may be cut together with the internal electrode patterns. Therefore, the dielectric layers may be formed to have the same width as that of the internal electrodes. 
     In addition, the ceramic green sheet multilayer body may be cut at individual ceramic body sizes along the cut lines C 2 -C 2 . That is, before the first and second side margin portions are formed, a laminate having a bar shape may be cut at the individual ceramic body sizes along the cut lines C 2 -C 2  to form a plurality of multilayer bodies  210 . 
     That is, the laminate having the bar shape may be cut so that central portions of the first internal electrodes and predetermined intervals formed between the second internal electrodes, which overlap each other, are cut by the same cut lines. Therefore, one ends of the first and second internal electrodes may be alternately exposed to cut surfaces. 
     Then, the first and second side margin portions may be formed on first and second side surfaces of the multilayer body  210 . 
     Then, as illustrated in  FIG. 5E , the first side margin portion  212  and the second side margin portion (not illustrated) may be formed on the first and second side surfaces of the multilayer body  210 , respectively. 
     In detail, in a method of forming the first side margin portion  212 , a ceramic green sheet  212  for a side surface to which an adhesive (not illustrated) is applied may be disposed on a punching elastic material  300  formed of rubber. 
     Then, the multilayer body  210  may be rotated by 90° so that the first side surface of the multilayer body  210  faces the ceramic green sheet  212  for a side surface to which the adhesive (not illustrated) is applied, and the multilayer body  210  may then be pressed and closely adhered to the ceramic green sheet  212  for a side surface to which the adhesive (not illustrated) is applied. 
     When the ceramic green sheet  212  for a side surface is transferred to the multilayer body  210  by pressing and closely adhering the multilayer body  210  to the ceramic green sheet  212  for a side surface to which the adhesive (not illustrated) is applied, the ceramic green sheet  212  for a side surface may be formed up to an edge portion of the side surface of the multilayer body  210  due to the punching elastic material  300  formed of the rubber, and the remaining portions may be cut. 
       FIG. 5F  illustrates that the ceramic green sheet  212  for a side surface is formed up to the edge portion of the side surface of the multilayer body  210 . 
     Then, the multilayer body  210  may be rotated, and the second side margin portion may be formed on the second side surface of the multilayer body  210 . 
     Then, the multilayer body  210  having the first and second side margin portions formed on opposite side surfaces thereof, respectively, may be calcinated and sintered to form the ceramic body including the dielectric layers and the first and second internal electrodes. 
     According to another exemplary embodiment in the present disclosure, the adhesive is applied to the ceramic green sheet  212  for a side surface, and the ceramic green sheet  212  for a side surface may thus be transferred to the side surface of the multilayer body  210  under a low temperature and low pressure condition unlike the related art. 
     Therefore, damage to the multilayer body  210  may be significantly decreased, such that deterioration of electrical characteristics of the multilayer ceramic capacitor after the sintering may be prevented, and reliability of the multilayer ceramic capacitor may be improved. 
     In addition, the ceramic green sheet  212  for a side surface to which the adhesive is applied may be transferred to the side surface of the multilayer body  210  and be pressed in a sintering process to increase close adhesion between the multilayer body and the ceramic green sheet for a side surface. 
     Then, external electrodes may be formed, respectively, on the third side surface of the ceramic body to which the first internal electrodes are exposed and the fourth side surface of the ceramic body to which the second internal electrodes are exposed. 
     According to another exemplary embodiment in the present disclosure, a thickness of the ceramic green sheet for a side surface may be small and a deviation of the thickness of the ceramic green sheet for a side surface may be small, such that the large size of the capacitance forming portion may be secured. 
     In detail, an average thickness tc of each of the first and second side margin portions  112  and  113  after the sintering may be 10 μm or more and less than 45 μm, and the deviation of the thickness of each of the first and second side margin portions  112  and  113  at each position may be small, such that the large size of the capacitance forming portion may be secured, and the moistureproof reliability may be excellent. 
     Therefore, a high-capacitance multilayer ceramic capacitor may be implemented. 
     A description for features that are the same as those in the exemplary embodiment in the present disclosure described above will be omitted in order to avoid an overlapping description. 
     Hereinafter, the present disclosure will be described in more detail through Experimental Example. However, Experimental Example is to assist in the detailed understanding of the present disclosure, and the scope of the present disclosure is not limited by Experimental Example. 
     EXPERIMENTAL EXAMPLE 
     Multilayer ceramic capacitors according to Inventive Examples 1 and 2 were manufactured so that the average thicknesses tc of each of the first and second side margin portions  112  and  113  are 10 μm and 25 μm, and a multilayer ceramic capacitor according to Comparative Example was manufactured so that the average thickness of each of the first and second side margin portions is 45 μm. 
     In addition, ceramic green sheet multilayer bodies were formed to form side margin portions by attaching ceramic green sheets for a side surface to electrode exposed portions of green chips that do not have margins due to exposure of internal electrodes in a width direction as in Comparative Example and Inventive Example. 
     Multilayer ceramic capacitor green chips having a 0603 size (width×length×height is 0.6 mm&gt;0.3 mm×0.3 mm) were manufactured by applying a predetermined temperature and pressure under a condition in which deformation of the chips is significantly suppressed to attach the ceramic green sheets for a side surface to opposite surfaces of the ceramic green sheet multilayer bodies. 
     Multilayer ceramic capacitor specimens of which the manufacture is completed as described above were subjected to a calcinating process in a nitrogen atmosphere at 400° C. or less, and were sintered under a condition of a hydrogen concentration of 0.5% H 2  or less at a sintering temperature of 1200° C. or less. Then, moisture permeability rates of the multilayer ceramic capacitor specimens were confirmed. 
     Measurement of the moisture permeability rates was performed by observing the multilayer ceramic capacitors according to Comparative Example and Inventive Examples 1 and 2 at a temperature of 160° C. and a relative humidity of 90% for 300 minutes. 
     
       
         
           
               
               
               
             
               
                   
                 TABLE 1 
               
               
                   
                   
               
               
                   
                 Thickness (μm) of 
                 Moisture Permeability 
               
               
                   
                 Side Margin Portion 
                 Rate (wt %) 
               
               
                   
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
            
               
                   
                 Inventive 
                 10 
                 0.001 
               
               
                   
                 Example 1 
               
               
                   
                 Inventive 
                 25 
                 0.002 
               
               
                   
                 Example 2 
               
               
                   
                 Comparative 
                 45 
                 0.783 
               
               
                   
                 Example 
               
               
                   
                   
               
            
           
         
       
     
     As a measurement result of the above experiment, it may be seen that in Inventive Examples 1 and 2, moisture permeability rates have values almost close to 0, such that moistureproof reliability is excellent. 
     On the other hand, it may be seen that in Comparative Example, a moisture permeability rate is high (0.783 wt %), such that moistureproof reliability is low. 
     It proved that in Comparative Example, a case in which the multilayer ceramic capacitor is manufactured so that the average thickness of each of the first and second side margin portions is 45 μm, such that the average thickness of each of the first and second side margin portions is 45 μm or more, sintering is not sufficiently performed, such that pores are generated in an inner portion and a surface of each of the side margin portions and moisture thus permeates into the multilayer ceramic capacitor. 
     As set forth above, according to an exemplary embodiment in the present disclosure, the thickness of the side margin portion disposed on the side surface of the ceramic body may be controlled to prevent the permeation of the moisture, resulting in improvement of the moistureproof reliability. 
     While exemplary embodiments have been shown and described above, it will be apparent to those skilled in the art that modifications and variations could be made without departing from the scope of the present invention as defined by the appended claims.