JP2006013245A - Multilayer ceramic capacitor and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for easily and certainly manufacturing a multilayer ceramic capacitor in which an internal electrode is provided at the central position of a multilayer ceramic element and which is high in reliability and excellent in shape accuracy. <P>SOLUTION: In the method for manufacturing the multilayer ceramic capacitor, a laminate 21 is formed by arranging a plurality of internal electrode pattern groups 22 respectively composed of internal electrode patterns 12 (12a, 12b, and 12b') in a matrix. Each internal electrode pattern 12 is formed by arranging the internal electrode pattern 12a which becomes an internal electrode drawn out to one end face 24a and the internal electrode patterns 12b and 12b', which become internal electrodes drawn out from the other end face 24b by shifting the positions of the patterns 12a, 12b, and 12b' in three or more steps in a direction Y which is almost perpendicular to the drawing-out direction X of the internal electrodes. Then, the laminate 21 is divided into individual multilayer ceramic elements 1 through a step of cutting the laminate 21 at intermediate positions P1 and P2 of the gaps G1 and G2 between adjacent internal electrode pattern blocks 22a and 22b when each internal electrode pattern group is considered as one block. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a multilayer ceramic capacitor and a method of manufacturing the same, and more specifically, a step of cutting a multilayer body formed by laminating ceramic green sheets provided with internal electrode patterns and dividing the multilayer body into individual multilayer ceramic elements. The present invention relates to a multilayer ceramic capacitor manufactured through the manufacturing method and a manufacturing method thereof.

  For example, as shown in FIG. 5, the multilayer ceramic capacitor includes a plurality of internal electrodes 52 a and 52 b stacked in a multilayer ceramic element 51 via a ceramic layer 53 and facing each other via the ceramic layer 53. The electrodes 52a and 52b are alternately drawn out to the end faces 54a and 54b on the opposite side of the multilayer ceramic element 51 and connected to external electrodes 55a and 55b formed on the end faces.

  Such a multilayer ceramic capacitor is formed by laminating a ceramic green sheet having an internal electrode pattern formed on the surface by printing and applying a conductive paste, and a ceramic green sheet having no internal electrodes formed on the upper and lower surfaces ( It is manufactured through a process of forming external electrodes on both ends of the fired laminate (laminated ceramic element) after laminating and pressing (dummy sheet), dividing into individual elements (cutting) and firing. Yes.

  However, in a multilayer ceramic capacitor, since there is a shrinkage difference between the internal electrodes 52a and 52b of the multilayer ceramic element and the ceramic layer 53 during firing, the combination of the material constituting the internal electrode and the material constituting the ceramic layer Depending on the case, the shrinkage strain generated during firing may remain as residual stress, causing delamination and cracking after firing, plating of external electrodes, etc. There is a problem in that structural defects such as delamination that increase with time due to intrusion occur, resulting in poor reliability such as deterioration of insulation resistance.

  In recent years, in order to meet the demands such as downsizing, large capacity, high performance, low ESR (equivalent series resistance) of multilayer ceramic capacitors, the ceramic layers have been made thinner, the number of stacked layers has been increased (internal electrodes). ) / Thickness of the ceramic layer between the internal electrodes), the residual stress tends to increase, and the above-described problems are more likely to occur.

  Therefore, in order to solve the above-described problems, the formation position of the first internal electrode 52a connected to the first external electrode 55a and the second internal electrode 52b connected to the second external electrode 55b As shown in FIGS. 6A and 6B, the formation position is substantially perpendicular to the direction in which the internal electrodes 52a and 52b are drawn out (the direction indicated by the arrow X in FIGS. 5 and 6B) (FIG. 6). A multilayer ceramic capacitor shifted in the direction indicated by arrow Y in (a) and (b) has been proposed (see Patent Document 1).

  However, in the multilayer ceramic capacitor disclosed in Patent Document 1, the first internal electrode 52a and the second internal electrode 52b are arranged so as to be shifted in a direction substantially orthogonal to the direction in which the internal electrodes 52a and 52b are drawn. For example, as schematically shown in FIG. 7, the internal electrode patterns exposed on one and the other pair of end surfaces of the mother laminate 60 are visually observed, and the gaps between the adjacent internal electrode patterns 62 a and 62 a are observed. When the mother laminate 60 is cut using a line L connecting the central portion C1 and the central portion C2 of the gap between the internal electrode patterns 62b and 62b exposed on the opposite end face as the cutting line, the internal electrode patterns 62a, The distances G2 and G1 from the side portion 62b to the side surface of the multilayer ceramic element 51 are different in each multilayer ceramic element 51, and the internal electrodes 52a, 5 Relates cleavage of b the pull-out direction (in the direction indicated by the arrow X in FIG. 6 (b)), there is a problem that the incidence of cutting failure is high.

  Further, as shown in FIG. 7, when the mother laminated body 60 is cut, only the multilayer ceramic element 51 whose planar shape is not square (for example, a parallelogram whose planar shape is not square) can be obtained. There is a problem that shape defects occur.

  In order to solve the above-described problems, cutting is performed along cutting lines corrected so that the distances G2 and G1 from the side portions of the internal electrode patterns 62a and 62b to the side surfaces of the multilayer ceramic element 51 are equal. However, for this purpose, it is necessary to perform position correction when determining the cutting line (cutting position).

And to make an appropriate correction,
(1) When the shift amount of the internal electrode pattern is known, the cutting position is corrected accordingly.
(2) It is necessary to take measures such as cutting the mother laminate, visually checking the position of the internal electrode pattern exposed in the cross section, and cutting at an appropriate position. However, in the case of the above method (1), there is a case where the target value of the shift amount and the actual shift amount do not coincide with each other, and there is a problem that the reliability becomes insufficient. In the case of the method (2), not only is the process complicated, but there is a problem that the number of products taken from the mother laminate is reduced.
JP-A-10-335168

  The present invention solves the above-mentioned problems, and it is possible to determine an appropriate cutting position by visually confirming the internal electrode pattern exposed on the end face of the mother laminated body. A multilayer ceramic capacitor having a structure in which a plurality of internal electrodes are arranged to face each other through layers, and ends of the internal electrodes are alternately drawn to one end face and the other end face of the multilayer ceramic element. It is an object of the present invention to provide a multilayer ceramic capacitor that can be manufactured and a method for manufacturing the same.

In order to solve the above-described problem, a method for manufacturing a multilayer ceramic capacitor of the present invention (Claim 1) includes:
A plurality of internal electrodes are arranged inside the multilayer ceramic element so as to face each other through the ceramic layer, and ends of the internal electrodes are alternately drawn out to one end face and the other end face of the multilayer ceramic element, A method for producing a multilayer ceramic capacitor having a structure connected to a pair of external electrodes disposed on one end face and the other end face of a multilayer ceramic element,
(a) An internal electrode pattern group consisting of three or more layers of internal electrode patterns opposed via a ceramic green sheet by laminating ceramic green sheets having a plurality of internal electrode patterns formed in a matrix on the surface. In the state of the multilayer ceramic element, an internal electrode pattern serving as an internal electrode drawn out to one end face and an internal electrode pattern serving as an internal electrode drawn from the other end face, and a direction substantially orthogonal to a direction serving as a drawing direction of the internal electrode Forming a laminated body in which a plurality of internal electrode pattern groups consisting of internal electrode patterns arranged in three or more stages are arranged in a matrix;
(b) When each of the plurality of internal electrode pattern groups is viewed as one block, the side electrode sides that are substantially parallel to the direction in which the internal electrode pattern blocks are adjacent to each other as viewed in a plan view. A step of cutting the laminated body at an intermediate position of the gap and dividing the laminated body into individual laminated ceramic elements.

  According to a second aspect of the present invention, there is provided a method for manufacturing a multilayer ceramic capacitor comprising: (a) forming a multilayer body; , Defined by a side portion on one side surface of the internal electrode closest to one side surface of the multilayer ceramic element and a side portion on the other side surface of the internal electrode closest to the other side surface exposed to the same end surface The internal electrode pattern is arranged so that the narrower region is included in the wider region of one end surface or the other end surface when viewed in a region perpendicular to the direction in which the internal electrode is drawn out. It is characterized by forming a laminated body.

  The method of manufacturing a multilayer ceramic capacitor according to claim 3 is characterized in that the internal electrode pattern group is composed of internal electrode patterns that are stacked via ceramic green sheets and that are continuous in the stacking direction.

The multilayer ceramic capacitor of the present invention (Claim 4) is:
A plurality of internal electrodes are arranged inside the multilayer ceramic element so as to face each other through the ceramic layer, and ends of the internal electrodes are alternately drawn out to one end face and the other end face of the multilayer ceramic element, A multilayer ceramic capacitor having a structure connected to a pair of external electrodes disposed on one end face and the other end face of a multilayer ceramic element,
The plurality of internal electrodes includes an internal electrode group consisting of three or more layers of internal electrodes arranged in three or more stages in a direction substantially perpendicular to the direction in which the internal electrodes are drawn; and
When the internal electrode group is viewed as a block, the internal electrode block is positioned substantially at the center of the multilayer ceramic element in a direction substantially perpendicular to a direction in which the internal electrode of the multilayer ceramic element is drawn. It is said.

  The multilayer ceramic capacitor according to claim 5 is a side portion on one side surface of the internal electrode closest to one side surface of the multilayer ceramic element of the internal electrode exposed on one end surface and the other end surface of the multilayer ceramic element; When looking at the region in the direction perpendicular to the lead-out direction of the internal electrode, defined by the side of the other side of the internal electrode closest to the other side exposed at the same end, The narrower region is included in the wider region.

  The multilayer ceramic capacitor according to claim 6 is characterized in that the internal electrode group is composed of internal electrodes stacked in a stacking direction and stacked via ceramic layers.

  The method for manufacturing a multilayer ceramic capacitor according to the present invention (Claim 1) includes three or more layers facing each other through ceramic green sheets by laminating ceramic green sheets having a plurality of internal electrode patterns formed in a matrix on the surface. The internal electrode pattern group consisting of internal electrode patterns, including an internal electrode pattern serving as an internal electrode drawn out to one end face and an internal electrode pattern serving as an internal electrode drawn from the other end face in the state of each multilayer ceramic element In addition, a plurality of internal electrode pattern groups each including three or more layers of internal electrode patterns arranged in three or more stages in a direction substantially orthogonal to the direction in which the internal electrodes are drawn out are arranged in a matrix. The stacked body is formed, and each of the plurality of internal electrode pattern groups is formed into one block. When viewed as a plan view, the internal electrode pattern blocks adjacent to each other in plan view are cut at an intermediate position of a gap on the side substantially parallel to the direction of the internal electrode drawing direction. The internal electrode pattern exposed on the end face of the mother laminate) can be visually confirmed to determine an appropriate cutting position, and the multilayer ceramic capacitor can be efficiently manufactured.

  That is, the amount of displacement of the internal electrode pattern is obtained by cutting the laminate at an intermediate position of the gap on the side of the internal electrode pattern blocks adjacent to each other in plan view that is substantially parallel to the direction in which the internal electrode is drawn out. Even when it is not known, it becomes possible to cut the laminate at an appropriate position, it becomes possible to suppress the occurrence of cutting failure, and when the laminate (mother laminate) is cut, It is possible to obtain a monolithic ceramic element having a planar shape of a square or close to it and having high shape accuracy, and a highly reliable monolithic ceramic capacitor can be manufactured efficiently and reliably.

  In addition, by laminating the internal electrode patterns at different positions, it becomes possible to suppress the occurrence of internal defects due to firing shrinkage differences and delamination caused by the surroundings of the internal electrode patterns rising in a so-called saddle shape. Also in this respect, a highly reliable multilayer ceramic capacitor can be obtained.

  Further, in the multilayer ceramic capacitor manufacturing method according to claim 2, in the step of forming the multilayer body, the multilayer ceramic element of the internal electrode exposed on one end face and the other end face of the multilayer ceramic element in the state of the multilayer ceramic element Of the internal electrode defined by a side portion on one side surface of the internal electrode closest to the one side surface of the internal electrode and a side portion on the other side surface of the internal electrode closest to the other side surface exposed to the same end surface. When a region in a direction orthogonal to the lead-out direction is viewed, a laminated body in which the internal electrode pattern is disposed is formed so that the narrower region is included in the wider region of one end surface or the other end surface. In such a case, the intermediate positions of the gaps on the side sides that are substantially parallel to the direction of the internal electrode lead-out direction between the internal electrode pattern blocks of the end surfaces corresponding to each other of the stacked body By cutting the laminate as a cutting line a line connecting the allows the internal electrode block can be more reliably producing a multilayer ceramic capacitor located in the center of the laminated ceramic device.

  Further, when the internal electrode pattern group is constituted by internal electrode patterns that are laminated via ceramic green sheets and are continuous in the lamination direction, as in the method for manufacturing a multilayer ceramic capacitor according to claim 3, the lamination direction A predetermined internal electrode pattern (internal electrode pattern group consisting of internal electrode patterns arranged in three or more stages in a direction substantially orthogonal to the direction in which the internal electrode is drawn out) It is possible to determine the cutting position of the laminated body (mother laminated body) by paying attention to only, and to simplify the lamination process of the ceramic green sheet on which the internal electrode pattern is formed. It is possible to efficiently manufacture a highly functional multilayer ceramic capacitor.

The multilayer ceramic capacitor according to the present invention (Claim 4) is a multilayer ceramic capacitor having three or more layers in which a plurality of internal electrodes are arranged at three or more stages in a direction substantially perpendicular to the direction in which the internal electrodes are drawn. When the internal electrode group is viewed as a block, the internal electrode block is positioned approximately at the center of the multilayer ceramic element in a direction substantially perpendicular to the direction of drawing the internal electrode of the multilayer ceramic element. Therefore, the distance from the side surface of the multilayer ceramic element to the side portion of the internal electrode does not become too small, and high reliability can be realized.
The multilayer ceramic capacitor of the present invention (Claim 4) can be efficiently manufactured by any one of the methods of Claims 1 to 3 of the present application, and is excellent in economy.

The multilayer ceramic capacitor according to claim 5 is the same as the side portion of one side surface of the internal electrode closest to one side surface of the multilayer ceramic element of the internal electrode exposed on one end surface and the other end surface of the multilayer ceramic element. When viewed in a region perpendicular to the lead-out direction of the internal electrode defined by the side of the other side of the internal electrode closest to the other side exposed at the end surface, one end surface or the other end surface, It is configured to include the narrower region within the wider region, and the internal electrode block is positioned at the center of the multilayer ceramic element without increasing the size of the product, thereby realizing high reliability. It becomes possible.
The multilayer ceramic capacitor of claim 5 can be efficiently manufactured by the method of claim 2 or 3 of the present application.

Further, as in the multilayer ceramic capacitor according to claim 6, when the internal electrode group is composed of internal electrodes that are stacked via the ceramic layers and that are continuous in the stacking direction, the internal electrode block is also formed of the multilayer ceramic capacitor. It is possible to achieve high reliability by being positioned at the center of the element.
The multilayer ceramic capacitor of claim 6 can be efficiently manufactured by the method of claim 3 of the present application.

  The features of the present invention will be described in more detail below with reference to examples of the present invention.

  In Example 1, as shown in FIGS. 2 (a) and 2 (b), a plurality of internal electrodes 2 (2a, 2b, 2b ′) are laminated through a ceramic layer 3 in the laminated ceramic element 1, Further, the internal electrodes 2 (2a, 2b, 2b ′) facing each other through the ceramic layer 3 are alternately drawn out to the end faces 4a, 4b on the opposite side of the multilayer ceramic element 1, and the external electrodes formed on the end faces A method of manufacturing a multilayer ceramic capacitor having a structure connected to 5a and 5b will be described with reference to FIG.

  FIG. 1 is a view showing a method of manufacturing a multilayer ceramic capacitor according to one embodiment (Example 1) of the present invention, and is for a ceramic green sheet having an internal electrode pattern and an outer layer in which no internal electrode pattern is formed. It is a figure which shows the principal part of the mother laminated body formed by laminating | stacking a ceramic green sheet, Comprising: (a) is an end view seen from one side, (b) is a top view, (c) is from the other side FIG. FIG. 1 shows a pair of portions to be two multilayer ceramic capacitors in the mother multilayer body.

  In this embodiment, ceramic green sheets having a plurality of internal electrode patterns formed in a matrix are stacked on the surface, thereby facing each other through the ceramic green sheets 13 as shown in FIGS. A laminated body (mother laminated body) 21 including an internal electrode pattern group 22 composed of a plurality of layers of internal electrode patterns 12 was formed.

  In this laminated body (mother laminated body) 21, in the state of the laminated ceramic element 1 (FIG. 2), the internal electrode pattern that becomes the internal electrode 2a drawn to one end face 24a (FIGS. 1A and 2). 12a and internal electrode patterns 12b and 12b ′ to be internal electrodes 2b and 2b ′ drawn from the other end face 24b (FIGS. 1C and 2), and are opposed to each other through the ceramic green sheet 13 Direction (direction indicated by arrow Y) in which electrode pattern 12 (12a, 12b, 12b ′) is substantially orthogonal to the direction in which internal electrode pattern 12 (12a, 12b, 12b ′) is drawn (direction indicated by arrow X) Are arranged with their positions shifted. In other words, in this embodiment, the internal electrode patterns 12 (12a, 12b, 12b ′) are arranged with the positions shifted in three stages, and the internal electrode patterns 12a are substantially in the lead-out direction (direction indicated by the arrow X). In the orthogonal direction (direction indicated by the arrow Y), it is disposed so as to be located at the center of the internal electrode patterns 12b and 12b ′.

  Further, as shown in FIG. 2, the internal electrodes 2 (2a, 2b, 2b ′) facing each other through the ceramic layer 3 are alternately drawn out to the opposite end faces 4a, 4b of the multilayer ceramic element 1, and The laminated ceramic element 1 is laminated in the order of 2a, 2b, 2a, 2b ′, 2a... From the upper surface side to the lower surface side, and the internal electrode 2b and the internal electrode 2b ′ are alternately sandwiched between the internal electrodes 2a. Are stacked.

  Further, as shown in FIG. 1, the mother multilayer body 21 includes a multilayer ceramic element of the internal electrode 2a exposed on one end face 4a (24a) of the multilayer ceramic element 1 in the state of the multilayer ceramic element 1 (see FIG. 2). A direction (indicated by an arrow Y) orthogonal to an internal electrode lead-out direction (indicated by an arrow X) defined by a side portion 32a on the one side surface 34a side and a side portion 32a on the other side surface 34b side. Of the internal electrode 2b 'closest to the one side surface 34a of the multilayer ceramic element 1 of the internal electrodes 2b and 2b' exposed on the other end surface 4b (24b). The lead-out direction of the internal electrode defined by 32b ′ and the side portion 32b on the other side surface 34b side of the internal electrode 2b closest to the other side surface 34b exposed on the same end surface 4b (24b) ( When the region R2 in the direction orthogonal to the direction indicated by the mark X (direction indicated by the arrow Y) is viewed, the narrower one in the wider region R2 (FIG. 1 (b), FIG. 2 (b)). The region R1 (FIG. 1B, FIG. 2B) is included.

  When the mother laminate 21 is viewed as a single block for each of the plurality of internal electrode pattern groups 22, the internal electrodes of the internal electrode pattern blocks (internal electrode pattern groups) 22 that are adjacent in plan view. The mother laminated body 21 is cut at an intermediate position between the gaps G1 and G2 (FIG. 1) on the side substantially parallel to the drawing direction of the pattern 12 (direction indicated by the arrow X), and the drawing direction of the internal electrode pattern 12 (arrow X) Are divided into individual multilayer ceramic elements (unfired multilayer ceramic elements) 1 (1a) by cutting even at predetermined positions in a direction (direction indicated by arrow Y) orthogonal to the direction indicated by.

  Specifically, the internal electrode pattern block (internal electrode pattern group) 22 (22a) composed of the internal electrode patterns 12a exposed on the one end surface 24a is approximately in the drawing direction (direction indicated by the arrow X) of the internal electrode patterns 12a. The inner position of the internal electrode pattern block (internal electrode pattern group) 22 (22b) consisting of the central position P1 of the parallel side gap G1 (FIG. 1) and the internal electrode patterns 12b and 12b ′ exposed on the other end face 24b. A line connecting the central position P2 of the gap G2 (FIG. 1) on the side substantially parallel to the drawing direction (direction indicated by the arrow X) of the electrode patterns 12b and 12b ′ is cut as a cutting line.

  Then, after degreasing and firing the individual multilayer ceramic elements, external electrodes are formed on the individual multilayer ceramic elements to obtain a multilayer ceramic capacitor having the internal electrode group 23 as shown in FIG.

  According to the method of the above embodiment, the internal electrode patterns exposed on the one end face and the other end face of the mother laminate are visually checked, the center positions P1 and P2 of the gaps G1 and G2 are confirmed, and P1 and P2 are connected. By simply cutting the line as a cutting line, as shown in FIG. 2B, the internal electrodes 2a, 2b, 2b ′ are each in a direction (indicated by the arrow Y) perpendicular to the direction in which the internal electrode is drawn (indicated by the arrow X). The internal electrode group (internal electrode block) 23 is drawn in the direction in which the internal electrode 2 of the multilayer ceramic element 1 is drawn out when the internal electrode group 23 is viewed as a block. In a direction (direction indicated by arrow Y) substantially orthogonal to (direction indicated by arrow X), it becomes possible to efficiently manufacture the multilayer ceramic capacitor located at the approximate center of the multilayer ceramic element 1.

  In the multilayer ceramic capacitor manufactured by the above-described manufacturing method, as shown in FIG. 2B, the internal electrodes 2a, 2b, 2b ′ are each orthogonal to the direction in which the internal electrodes are drawn (direction indicated by the arrow X). When the internal electrode group 23 is viewed as a block, the internal electrode group (internal electrode block) 23 is arranged inside the multilayer ceramic element 1 in the direction (direction indicated by the arrow Y). In a direction (direction indicated by arrow Y) substantially orthogonal to the direction in which the electrode 2 is drawn (direction indicated by arrow X), it is located at the approximate center of the multilayer ceramic element 1, and the internal electrode 2 (2a , 2b, 2b '), the distance (gap) Ga to the side closest to the side surface is the same on both side surfaces of the multilayer ceramic element 1, so that the multilayer ceramic element It is possible to prevent the distance (gap) Ga from the side surface of the inner electrode 2 (2a, 2b, 2b ′) to the nearest side of the internal electrode 2 (2a) from becoming too small, and provide a highly reliable multilayer ceramic capacitor. It becomes possible.

In addition, it is possible to obtain a multilayer ceramic capacitor having a planar shape of the multilayer ceramic element and excellent shape accuracy.
Furthermore, when the mother laminate 1 is cut and divided into individual multilayer ceramic elements, correction of the cutting position is not necessary, so that when the ceramic green sheets on which the internal electrode patterns are formed are stacked, the internal electrode pattern Since it becomes unnecessary to confirm the shift amount in advance, the manufacturing process can be simplified and the productivity can be improved.

In addition, by the method of shifting the position of the internal electrode of the above Example 1 in three stages, for example,
(1) Length (L) = 3.2mm, Width (W) = 1.6mm Height (T) = 1.25mm
(2) Distance (gap) Ga = 270 μm (when unfired), 210 μm (after firing) from the side surface of the multilayer ceramic element to the nearest side of the internal electrode 2 (2a, 2b, 2b ′)
(3) Internal electrode displacement = 30 μm (when unfired), 24 μm (after firing)
(However, regarding the displacement amount of the internal electrode, the displacement amount of the internal electrode pattern 12b with respect to the internal electrode pattern 12a is set to 30 μm (when not fired) and 24 μm (after firing) on the left in FIG. The amount of displacement of the internal electrode pattern 12b ′ was set to 30 μm (when not fired) and 24 μm (after firing) on the right in FIG.
(4) When a multilayer ceramic capacitor was manufactured under the condition of the number of internal electrodes = 30, the cutting failure rate when the mother multilayer body was cut in a direction parallel to the lead-out direction of the internal electrodes was 0.42%. .
On the other hand, as shown in FIG. 7, in the case of the conventional method in which the position of the internal electrode is shifted in two stages (shift amount: 30 μm alternately (in the unfired), 24 μm in the direction orthogonal to the internal electrode drawing direction) The defective cutting rate (after firing) was 0.93%.
Thus, in the case of the method of Example 1, it was confirmed that the cutting defect rate can be reduced to ½ or less as compared with the conventional manufacturing method in which the position of the internal electrode is shifted in two stages.

Hereinafter, a multilayer ceramic capacitor according to another embodiment (Example 2) of the present invention and a method for manufacturing the same will be described with reference to FIGS.
FIG. 3 is a diagram showing a method for manufacturing a multilayer ceramic capacitor according to Example 2, in which a ceramic green sheet having an internal electrode pattern and a ceramic green sheet for an outer layer on which no internal electrode pattern is formed are stacked. It is a figure which shows the principal part of the mother laminated body formed by this, Comprising: (a) The end view seen from one side, (b) is a top view, (c) is the end view seen from the other side, FIG. 4A and 4B are diagrams showing the configuration of the multilayer ceramic capacitor according to Example 2, wherein FIG. 4A is a cross-sectional view, and FIG. 4B is a plan view.
3A, 3B, and 3C show a pair of portions that are two multilayer ceramic capacitors of the mother multilayer body.
3 and 4, the same reference numerals as those in FIGS. 1 and 2 indicate the same or corresponding parts.

  In the first embodiment, the case where the position of the internal electrode pattern is shifted in three steps has been described as an example. However, in the second embodiment, the mode shown in FIGS. 3A, 3B, and 3C is used. The position of the internal electrode pattern to be drawn to one end face of the multilayer ceramic element is shifted in two stages, and the position of the internal electrode pattern to be drawn to the other end face is shifted in three stages to The pattern is shifted in five stages in total.

  That is, in the first embodiment, the position of the internal electrode pattern 12a to be drawn to one end face is fixed, and the positions of the internal electrode patterns 12b and 12b ′ to be drawn to the other end face are shifted in two stages, so that the total However, in the second embodiment, as shown in FIG. 3, the internal electrode patterns 12a and 12a which are to be drawn out to the one end face 24a are arranged. 'Are shifted in position, and the internal electrode patterns 12b and 12b'12b' 'to be drawn out to the other end face 24b are shifted in three stages, and the internal electrode The pattern was arranged at five different positions.

  Furthermore, as shown in FIG. 4, internal electrodes 2 (2a, 2a ′, 2b, 2b ′, 2b ″) facing each other through the ceramic layer 3 are alternately arranged on the opposite end face 4a, 4b and laminated in the order of 2b ′, 2a ′, 2b, 2a, 2b ″, 2a ′, 2b, 2a, 2b ′... From the upper surface side to the lower surface side of the multilayer ceramic element 1. ing.

  Further, as shown in FIG. 3, the mother laminated body 21 is in the state of the laminated ceramic element 1 (see FIG. 4), and the internal electrodes 2 a and 2 a ′ exposed on the one end face 4 a (24 a) of the laminated ceramic element 1. The side electrode 32a ′ on the side surface 34a side of the internal electrode 2a ′ closest to the one side surface 34a of the multilayer ceramic element 1 and the internal electrode 2a closest to the other side surface 34b exposed on the same end surface 4a (24a). Exposed to the region R1 in the direction (indicated by arrow Y) orthogonal to the internal electrode lead-out direction (indicated by arrow X) defined by the side portion 32a on the other side surface 34b and the other end surface 24b The same end face 4b (2) as the side part 32b '' on the side surface 34a side of the internal electrode 2b '' closest to the one side face 34a of the multilayer ceramic element 1 of the internal electrodes 2b, 2b ', 2b' ' b) orthogonal to the internal electrode lead-out direction (direction indicated by arrow X) defined by the side portion 32b ′ on the side of the other side surface 34b of the internal electrode 2b ′ closest to the other side surface 34b. When viewing the region R2 in the direction (indicated by the arrow Y), the narrower region R1 (FIG. 3 (b), FIG. 3B) is included in the wider region R2 (FIG. 3 (b), FIG. 4 (b)). 4 (b)) is included.

  Since Example 2 is configured as described above, an internal electrode pattern block (internal electrode pattern group) composed of internal electrode patterns 12a and 12a ′ exposed on one end face 24a, as in Example 1 above. 22 (22a), the central position P1 of the gap G1 (FIG. 3) on the side substantially parallel to the drawing direction of the internal electrode patterns 12a and 12a ′ (direction indicated by the arrow X), and the internal exposed at the other end face 24b. Pull-out direction of the internal electrode patterns 12b, 12b ′, 12b ″ between the internal electrode pattern blocks (internal electrode pattern group) 22 (22b) including the electrode patterns 12b, 12b ′, 12b ″ (direction indicated by the arrow X) By cutting the line connecting the central position P2 of the gap G2 (FIG. 3) on the side substantially parallel to the cutting line as a cutting line, no cutting failure occurs. Can be divided by cutting the mother laminate 21 in a predetermined position, the respective laminated ceramic device (unfired multilayer ceramic element) 1 (1a).

  Therefore, when the internal electrode group is viewed as a block, the internal electrode group (internal electrode block) 23 is in a direction (indicated by the arrow Y) substantially orthogonal to the direction in which the internal electrode 2 of the multilayer ceramic element 1 is drawn (direction indicated by the arrow X). In the direction shown), the multilayer ceramic element 1 is positioned substantially at the center, and is closest to the side surface among the side portions of the internal electrodes (2a, 2a ′, 2b, 2b ′, 2b ″) from the side surface of the multilayer ceramic element. It is possible to provide a highly reliable multilayer ceramic capacitor in which the distance (gap) Ga to the object is substantially the same on both side surfaces of the multilayer ceramic element 1.

In addition, it is possible to obtain a multilayer ceramic capacitor having a planar shape of the multilayer ceramic element and excellent shape accuracy.
Furthermore, when the mother laminate is cut and divided into individual multilayer ceramic elements, correction of the cutting position becomes unnecessary, and the amount of shift of the internal electrode pattern when stacking the ceramic green sheets on which the internal electrode pattern is formed Since it is not necessary to confirm the above in advance, it is possible to simplify the manufacturing process and improve productivity.

In the first embodiment, the position of the internal electrode is shifted in three stages. In the second embodiment, the position of the internal electrode is shifted in five stages in total. The above is sufficient, and it is possible to shift to four stages, five stages,... However, if there are too many stages,
(a) When the dimensions of the multilayer ceramic element are the same, the distance (gap) from the side surface of the multilayer ceramic element to the side closest to the side surface of the internal electrode is reduced, the cut defect rate increases, Leading to reduced reliability,
(b) In order to secure a distance (gap) from the side surface of the multilayer ceramic element to the side portion closest to the side surface of the internal electrode, the shift amount must be reduced, and the internal electrode and the ceramic layer are fired. The effect of preventing the occurrence of internal defects due to shrinkage differences and the suppression of the occurrence of delamination caused by the so-called saddle shape around the internal electrode pattern is impaired.
(c) Depending on how the internal electrodes are stacked, the effective area (overlapping area of the internal electrodes) may be greatly reduced, so there is a problem that the capacity may be greatly reduced. In this case, the number of stages is preferably 5 or less, and in particular, a highly reliable product can be manufactured more effectively by using 3 stages.

  The present invention is not limited to the first and second embodiments, but relates to a specific amount of internal electrode displacement, the number of internal electrode layers, the shape and constituent materials of the internal electrodes, the dimensions of the multilayer ceramic capacitor, and the like. Various applications and modifications can be made within the scope of the invention.

As described above, according to the present invention, it is possible to visually check the internal electrode pattern exposed on the end face of the laminated body (mother laminated body) to determine an appropriate cutting position, and the internal electrode is a laminated ceramic element. It is possible to easily and surely manufacture a monolithic ceramic capacitor that is disposed at the center position and has high reliability and excellent shape accuracy.
Therefore, the present invention can be widely applied to the manufacture of multilayer ceramic capacitors manufactured through a process of dividing a mother multilayer body into individual multilayer ceramic elements.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows the manufacturing method of the multilayer ceramic capacitor concerning one Example (Example 1) of this invention, Comprising: It is a figure which shows the principal part of a mother laminated body, (a) is the end elevation seen from one side, (b) is a plan view, and (c) is an end view as seen from the other side. (a) is front sectional drawing of the multilayer ceramic capacitor concerning this invention (Example 1), (b) is a top view. It is a figure which shows the manufacturing method of the multilayer ceramic capacitor concerning this invention (Example 2), Comprising: It is a figure which shows the principal part of a mother laminated body, Comprising: (a) is an end elevation seen from one side, (b) A plan view, (c) is an end view seen from the other side. (a) is front sectional drawing of the multilayer ceramic capacitor concerning this invention (Example 2), (b) is a top view. It is sectional drawing of the conventional multilayer ceramic capacitor. (a) is the end surface sectional drawing of the conventional multilayer ceramic capacitor which shifted the formation position of the 1st internal electrode and the 2nd internal electrode, (b) is a top view. It is a figure explaining the method of cut | disconnecting the conventional multilayer ceramic capacitor.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Multilayer ceramic element 1a Unsintered multilayer ceramic element 2 (2a, 2a ', 2b, 2b', 2b '') Internal electrode 3 Ceramic layer 4a, 4b End surface of multilayer ceramic element 5a, 5b External electrode 12 (12a, 12a ', 12b, 12b', 12b '') Internal electrode pattern 13 Ceramic green sheet 21 Laminate (mother laminate)
22 internal electrode pattern group 22a, 22b internal electrode pattern block 23 internal electrode group (internal electrode block)
24a One end face 24b The other end face 32a, 32a ′, 32b, 32b ′, 32b ″ Side of the internal electrode 34a One side of the multilayer ceramic element 34b The other side of the multilayer ceramic element G1, G2 Gap Ga Side of the multilayer ceramic element Distance from the side of the internal electrode closest to the side (gap)
P1, P2 Gap center position R1, R2 region X Internal electrode pattern extraction direction Y Direction substantially orthogonal to internal electrode pattern extraction direction

Claims (6)

A plurality of internal electrodes are arranged inside the multilayer ceramic element so as to face each other through the ceramic layer, and ends of the internal electrodes are alternately drawn out to one end face and the other end face of the multilayer ceramic element, A method for producing a multilayer ceramic capacitor having a structure connected to a pair of external electrodes disposed on one end face and the other end face of a multilayer ceramic element,
(a) An internal electrode pattern group consisting of three or more layers of internal electrode patterns opposed via a ceramic green sheet by laminating ceramic green sheets having a plurality of internal electrode patterns formed in a matrix on the surface. In the state of the multilayer ceramic element, an internal electrode pattern serving as an internal electrode drawn out from one end face and an internal electrode pattern serving as an internal electrode drawn out from the other end face, and substantially orthogonal to the direction serving as the lead-out direction of the internal electrode A step of forming a laminated body in which a plurality of internal electrode pattern groups composed of internal electrode patterns arranged in three or more stages in a direction to be arranged in a matrix,
(b) When each of the plurality of internal electrode pattern groups is viewed as one block, the side electrode sides that are substantially parallel to the direction in which the internal electrode pattern blocks are adjacent to each other as viewed in a plan view. And a step of cutting the multilayer body at a middle position of the gap and dividing the multilayer body into individual multilayer ceramic elements. A method for producing a multilayer ceramic capacitor, comprising:   In the step of forming the multilayer body of (a), an internal electrode closest to one side surface of the multilayer ceramic element of the internal electrode exposed on one end face and the other end face of the multilayer ceramic element in the state of the multilayer ceramic element The region in the direction orthogonal to the lead-out direction of the internal electrode defined by the side portion on one side surface and the side portion on the other side surface of the internal electrode closest to the other side surface exposed on the same end surface In this case, the laminate in which the internal electrode pattern is disposed is formed so that the narrower region is included in the wider region of one end surface or the other end surface. A method for producing a monolithic ceramic capacitor according to 1.   3. The method for manufacturing a multilayer ceramic capacitor according to claim 1, wherein the internal electrode pattern group is composed of internal electrode patterns that are stacked via ceramic green sheets and that are continuous in the stacking direction. A plurality of internal electrodes are arranged inside the multilayer ceramic element so as to face each other through the ceramic layer, and ends of the internal electrodes are alternately drawn out to one end face and the other end face of the multilayer ceramic element, A multilayer ceramic capacitor having a structure connected to a pair of external electrodes disposed on one end face and the other end face of a multilayer ceramic element,
The plurality of internal electrodes includes an internal electrode group consisting of three or more layers of internal electrodes arranged in three or more stages in a direction substantially perpendicular to the direction in which the internal electrodes are drawn; and
When the internal electrode group is viewed as a block, the internal electrode block is positioned substantially at the center of the multilayer ceramic element in a direction substantially perpendicular to a direction in which the internal electrode of the multilayer ceramic element is drawn. Multilayer ceramic capacitor.   The inner electrode exposed on the one end surface and the other end surface of the multilayer ceramic element is the side of the inner electrode closest to one side surface of the multilayer ceramic element and the side surface exposed on the same end surface is the most exposed on the other side surface. The narrower one in the wider region of one end surface or the other end surface when viewed in the region perpendicular to the lead-out direction of the internal electrode, defined by the side portion on the other side surface of the near inner electrode The multilayer ceramic capacitor according to claim 4, wherein the region is included.   6. The multilayer ceramic capacitor according to claim 4, wherein the internal electrode group is composed of internal electrodes that are stacked via ceramic layers and that are continuous in the stacking direction.

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