JP4375006B2 - Multilayer ceramic capacitor and manufacturing method thereof - Google Patents

Description

  The present invention relates to a multilayer ceramic capacitor and a method for manufacturing the multilayer ceramic capacitor, and more particularly to a multilayer ceramic capacitor provided with a determination mark for determining whether the arrangement state of internal electrodes is good and a method for manufacturing the same.

  As shown in FIGS. 12A and 12B, the multilayer ceramic capacitor is disposed in a ceramic multilayer element 51 such that a plurality of internal electrodes 53a and 53b are opposed to each other via a ceramic layer 52. One end side is alternately drawn out to an end face on a different side of the ceramic multilayer element 51, and a pair of external electrodes 54a and 54b are disposed on both end sides of the ceramic multilayer element 51 so as to be electrically connected to the internal electrodes 53a and 53b. Has a structured.

  The external electrodes 54a and 54b are formed by applying and baking a conductive paste containing a conductive metal material such as Ag powder, glass frit, resin and solvent, and the surface of the external electrodes 54a and 54b is usually A Ni plating film 55 for preventing soldering of the Ag electrode and a Sn plating film 56 for improving solderability are formed.

  By the way, in the multilayer ceramic capacitor having the above-described configuration, when the Ni plating film 55 and the Sn plating film 56 are formed on the surfaces of the external electrodes 54a and 54b by performing Ni plating or Sn plating, There is a problem that an internal defect is caused by intruding from the exposed portion of the internal electrode on the end face of the ceramic multilayer element 51.

Therefore, as shown in FIG. 13, the width W ₁ of the portions (leading portions) 63a and 63b drawn to the end face of the ceramic multilayer element 51 of the internal electrodes 53a and 53b is made larger than the width W ₂ of the capacitance forming portions 57a and 57b. There has been proposed a multilayer ceramic capacitor that is made narrow to suppress the penetration of the plating solution (see, for example, Patent Document 1 and Patent Document 2).

However, since the widths of the capacitance forming portions 57a and 57b and the lead portions 63a and 63b of the internal electrodes 53a and 53b are different, the internal electrodes 53a and 53b exposed on the end face of the ceramic multilayer element 51 (FIG. 12) are observed. However, there is a problem in that it cannot be determined whether or not the capacitance forming portions 57a and 57b of the internal electrodes 53a and 53b are disposed at appropriate positions. That is, portions of the internal electrodes 53a and 53b other than the lead portions 63a and 63b are not exposed to the outside from the side surfaces and end surfaces of the ceramic multilayer element 51 so as not to cause electrical continuity with the outside. However, when the width W ₁ of the lead portions 63a and 63b is narrower than the width W ₂ of the capacitance forming portions 57a and 57b, the internal electrodes 53a and 53a on the end face of the ceramic multilayer element 51 are required. Even if the exposed state of 53b is observed, there is a problem that it is impossible to confirm that the capacitance forming portions 57a and 57b of the internal electrodes 53a and 53b are disposed at appropriate positions.

  In addition, when the width of the lead-out portion is narrowed, the internal electrodes on both sides of the lead-out portions 63a and 63b are not present in the step of forming a laminated body (mother laminated body) by laminating and pressing the ceramic green sheets. In this part, pressure is not easily applied, and it is not pressurized enough, so peeling (delamination) is likely to occur at the boundary of the ceramic green sheet, and it is difficult to ensure sufficient reliability. is there.

In addition, since there are portions where no internal electrode exists on both sides of the lead portions 63a and 63b, as shown in FIG. 14, the shoulder portion of the ceramic multilayer element 51 has a rounded shape. There is a problem that the mounting reliability is lowered.
Further, the structure of the conventional example has a problem that the displacement of the internal electrodes 53a and 53b in the drawing direction cannot be confirmed unless the ceramic multilayer element is cut, and the reliability is low.
Japanese Utility Model Publication No. 54-166560 Japanese Patent Laid-Open No. 5-326317

  SUMMARY OF THE INVENTION The present invention solves the above-described problems, and is a highly reliable multilayer ceramic capacitor capable of suppressing the occurrence of delamination and reliably detecting the presence / absence of displacement of internal electrodes, and a method for manufacturing the same It is an issue to provide.

In order to solve the above problems, the multilayer ceramic capacitor of the present invention (Claim 1) is:
A plurality of internal electrodes are arranged so as to face each other through the ceramic layer, and external ends are connected to the internal electrodes at both end sides of the ceramic multilayer element in which one end side is alternately drawn to the end face on the different side. In a multilayer ceramic capacitor having a structure in which electrodes are arranged,
The width of the lead portion of the internal electrode to the end face of the ceramic multilayer element is formed narrower than the width of the capacitance forming portion that contributes to the capacitance formation of the internal electrode,
At least a part of one side and / or the other side of the extension line on one side and the other side of both sides of the capacitance forming portion of the predetermined internal electrode extending in the direction of drawing out the internal electrode. A dummy electrode that does not contribute to capacitance formation is disposed, and
When viewed with respect to one predetermined internal electrode and / or when viewed with respect to a plurality of predetermined internal electrodes, the dummy electrode is located on the extension line on one side and the extension line on the other side,
By examining the exposure state of the dummy electrode on the end face of the ceramic multilayer element, it is possible to determine whether or not at least the amount of positional deviation in the width direction of the internal electrode is within an allowable range. .

  Further, in the multilayer ceramic capacitor according to claim 2, the dummy electrode is disposed on both one side and the other side of the extension of the capacitance forming portion of each internal electrode extending in the direction of drawing out the internal electrode. It is characterized by being.

  According to a third aspect of the present invention, there is provided the multilayer ceramic capacitor as the dummy electrode, wherein the dummy electrode is provided with a dummy electrode in which a length in the lead-out direction of the internal electrode is shorter than a permissible displacement in the lead-out direction of the internal electrode. It is characterized in that it can be determined whether or not the amount of positional deviation in the lead-out direction of the internal electrode is within an allowable range depending on whether or not the end face of the multilayer element is exposed.

  According to a fourth aspect of the present invention, in the multilayer ceramic capacitor, the dummy electrode is shaped so that the width varies depending on the position of the internal electrode in the lead-out direction, and the internal electrode depends on the width of the dummy electrode exposed on the end face of the ceramic multilayer element. It is characterized in that it can be determined whether or not the amount of positional deviation in the pull-out direction is within an allowable range.

  In the multilayer ceramic capacitor according to claim 5, a second dummy electrode having a length shorter than the dummy electrode is disposed in parallel with the dummy electrode, and the second dummy electrode is exposed to the end face of the ceramic multilayer element. It is characterized in that it can be determined whether or not the amount of positional deviation in the lead-out direction of the internal electrode is within an allowable range depending on the presence or absence of this.

In addition, the manufacturing method of the multilayer ceramic capacitor of the present invention (Claim 6) is as follows.
A plurality of internal electrodes are arranged so as to face each other through the ceramic layer, and external ends are connected to the internal electrodes at both end sides of the ceramic multilayer element in which one end side is alternately drawn to the end face on the different side. In the method of manufacturing a multilayer ceramic capacitor having a structure in which electrodes are disposed,
A pair of capacitance forming region is provided at both ends, and a capacitance forming region at both ends is connected to the central portion, and has a leading portion region that is narrower than the width of the capacitance forming portion, and is cut at the leading portion region. And a plurality of internal electrode patterns divided into two internal electrodes and both sides of one capacitance forming portion region constituting the predetermined internal electrode pattern are extended toward both sides of the other capacitance forming portion region. The ceramic green sheets on which the dummy electrode patterns are arranged so that at least a part of the extension line on one side and / or the other side of the extension line on one side and / or the other side are located are alternately arranged. A step of forming a mother laminated body by laminating and crimping by a predetermined amount in the direction of the internal electrode drawing direction,
When the mother laminate is viewed at a predetermined position by cutting the mother stacked body at a predetermined position so that the lead-out region at the center of the internal electrode pattern is cut, and / Alternatively, when viewed with respect to a predetermined plurality of internal electrodes, the process of dividing the dummy electrode into individual unfired ceramic multilayer elements having a structure located on one extension line and on the other extension line;
Firing the green ceramic multilayer element;
And a step of forming external electrodes on the fired ceramic laminated element.

  The method for manufacturing a multilayer ceramic capacitor according to claim 7 is characterized in that a ceramic green sheet in which dummy electrode patterns are disposed on both of the extension lines on the one side and the other side is used as the ceramic green sheet. .

  The multilayer ceramic capacitor of the present invention (Claim 1) is one of two extension lines on one side and the other side of a predetermined internal electrode, in which both sides of a capacitance forming portion are extended in the direction of drawing out the internal electrode. A dummy electrode that does not contribute to capacitance formation is arranged so that at least a part thereof is located on the extended line on the side and / or the other side, and when the predetermined one internal electrode is viewed, and / or When looking at a plurality of internal electrodes, the dummy electrodes are positioned on the extension line on one side and the extension line on the other side, so by examining the exposure state of the dummy electrode on the end face of the ceramic multilayer element, It is possible to reliably determine whether or not the amount of displacement in the width direction of the electrode is within an allowable range, and remove defective products to ensure a highly reliable multilayer ceramic capacitor. It is possible to get to.

  Further, as in the multilayer ceramic capacitor according to claim 2, the dummy electrodes are disposed on both one side and the other side of the extension of the capacitance forming portion of each internal electrode extending in the direction of drawing out the internal electrode. As a result, it is possible to reliably determine whether or not the amount of positional deviation in the width direction is within an allowable range for all the internal electrodes, and it is possible to further improve the reliability.

Further, as in the multilayer ceramic capacitor according to claim 3, the dummy electrode has a dummy electrode in which the length of the internal electrode in the lead-out direction is shorter than the allowable positional deviation in the lead-out direction of the internal electrode. Depending on whether or not the dummy electrode is exposed to the end face of the ceramic multilayer element, it is possible to determine whether or not the amount of positional deviation in the lead-out direction of the internal electrode is within an allowable range. It becomes possible to obtain.
In the multilayer ceramic capacitor according to the third aspect of the present invention, a dummy electrode whose length in the lead-out direction is shorter than the allowable displacement in the lead-out direction of the internal electrode is used for all or a part of the plurality of dummy electrodes. It is possible.

Further, as in the multilayer ceramic capacitor according to claim 4, when the shape of the dummy electrode is such that the width varies depending on the position of the internal electrode in the drawing direction, it depends on the width of the dummy electrode exposed on the end face of the ceramic multilayer element. In addition, it becomes possible to determine whether or not the amount of positional deviation in the lead-out direction of the internal electrode is within an allowable range and the magnitude of the positional deviation, and it becomes possible to obtain a more reliable multilayer ceramic capacitor. .
Examples of the shape whose width varies depending on the position in the lead-out direction of the internal electrode include, for example, a triangular shape with one side positioned on the extension line.

Further, when the second dummy electrode having a shorter length than the dummy electrode is arranged in parallel with the dummy electrode as in the multilayer ceramic capacitor according to claim 5, the end face of the ceramic multilayer element is also arranged. Whether or not the second dummy electrode is exposed makes it possible to efficiently determine whether or not the amount of positional deviation in the lead-out direction of the internal electrode is within an allowable range.
Note that the number of second dummy electrodes is not limited and may be one or more. Further, in the case where a plurality of dummy electrodes are provided, all of the second dummy electrodes can have the same length, and some or all of the second dummy electrodes can have different lengths.

  The method for manufacturing a multilayer ceramic capacitor according to the present invention (Claim 6) is provided with a pair of capacitance forming portion regions at both ends and having a width larger than the width of the capacitance forming portion connecting the capacitance forming portion region to the central portion. A plurality of internal electrode patterns each having a narrow lead portion region and divided into two internal electrodes by cutting at the lead portion region, and both sides of one capacitance forming portion region are connected to the other capacitance forming portion region. The dummy electrode pattern is disposed so that at least a part of the extension line on one side and / or the other side of the extension line on one side and / or the other side extends toward both sides of The ceramic green sheets are alternately laminated by a predetermined amount in the direction of the internal electrode extraction direction, and bonded to form a mother laminate, which is formed at the central extraction portion of the internal electrode pattern. Since the external electrode is formed after being cut at a predetermined position so that a portion to be cut is fired, and / or when viewed with respect to one predetermined internal electrode, and / or a plurality of predetermined internal electrodes When it sees, it becomes possible to obtain the laminated ceramic capacitor provided with the structure where the dummy electrode is located on the extension line on one side and the extension line on the other side. In such a multilayer ceramic capacitor, the exposure state of the dummy electrode on the end face of the ceramic multilayer element is examined to reliably determine whether or not the amount of positional deviation in the width direction of the internal electrode is within an allowable range. Therefore, it is possible to reliably obtain a multilayer ceramic capacitor with high reliability by removing defective products.

  Further, as in the method of manufacturing a multilayer ceramic capacitor according to claim 7, by using a ceramic green sheet in which dummy electrode patterns are arranged on both one side and the other side as a ceramic green sheet, A more reliable monolithic ceramic capacitor that has dummy electrodes on both extension lines on one side and the other side of the electrode, and can check the amount of displacement in the width direction for all internal electrodes. It becomes possible to manufacture efficiently.

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

  FIG. 1A is a perspective plan view showing the arrangement of internal electrodes and dummy electrodes of a ceramic multilayer element constituting a multilayer ceramic capacitor according to an embodiment of the present invention, and FIG. 1B is an exploded perspective view showing the shape of 3b, FIG. 1C is a cross-sectional view taken along the line CC of FIG. 1A, and FIG. 2A is a multilayer ceramic capacitor according to an embodiment of the present invention. FIG. 2B is a perspective view of FIG.

  In the multilayer ceramic capacitor of this embodiment, as shown in FIGS. 1 (a), (b), (c), and FIGS. 2 (a), (b), a plurality of internal electrodes 3a, 3b have ceramic layers 2. External electrodes 4a and 4b are formed on both end sides of a ceramic multilayer element (multilayer ceramic capacitor element) 1 that is disposed so as to face each other, and one end side of which is alternately drawn out to an end face on a different side, In addition, the surface of the external electrodes 4a and 4b has a structure in which an Ni plating film 5 for suppressing solder erosion and an Sn plating film 6 for improving solderability are sequentially formed.

In this multilayer ceramic capacitor, the width W ₁ of the lead portions 13a and 13b of the internal electrodes 3a and 3b drawn out to the end face of the ceramic multilayer element 1 is determined via the other internal electrodes 3a and 3b and the ceramic layer 2. contribute capacitance forming part 7a in the capacitor formed by opposite, with being narrower than the width W ₂ of 7b, the inner electrodes 3a, the 3b, capacitance forming portion 7a, the internal electrodes 3a to both sides of 7b, 3b A linear dummy electrode 10 that does not contribute to capacitance formation is arranged so that its main part is positioned on two extension lines X and Y on one side and the other side that extend in the direction of drawing out.

  In the multilayer ceramic capacitor configured as described above, as shown in FIG. 1 (c), both sides of the capacitance forming portions 7a and 7b of the internal electrodes 3a and 3b are extended in the lead-out direction of the internal electrode, A dummy electrode 10 is disposed on the other two extension lines X (FIG. 1 (a)) and Y (FIG. 1 (a)) so as to sandwich the internal electrodes 3a and 3b. Therefore, it is possible to easily and reliably determine whether or not the amount of positional deviation in the width direction of the internal electrodes 3a and 3b is within an allowable range based on the exposed position of the dummy electrode 10 on the end face of the ceramic multilayer element 1. For example, in this embodiment, as shown in FIG. 1C, if the dummy electrodes 10 on both sides of the lead portions 13a and 13b of the internal electrodes 3a and 3b are detected from the end face of the ceramic multilayer element 1, The amount of displacement in the width direction of the electrodes 3a and 3b is within an allowable range (that is, the capacitance forming portions 7a and 7b are securely arranged in the ceramic multilayer element 1 with a necessary gap from the side surface of the ceramic multilayer element 1). You can see that it is installed. Therefore, it is possible to reliably supply a highly reliable multilayer ceramic capacitor.

Next, a method for manufacturing the above multilayer ceramic capacitor will be described.
In manufacturing the multilayer ceramic capacitor having the structure as described above, first, as shown in FIG. 3, on both sides of the ceramic green sheet 21, the other internal electrodes are opposed to each other through the ceramic layer. Regions (capacitor forming portion regions) 17a and 17b serving as capacitance forming portions 7a and 7b (FIGS. 1A and 1B) contributing to the capacitance formation are provided, and a width W ₀₁ (FIG. 4) is provided at the center. A region (leader region) 13 serving as a lead-out portion to the end face of the ceramic multilayer element 1 (FIG. 1), which is narrower than the width W ₀₂ (FIG. 4) of the capacitor forming portion regions 17a and 17b, is provided. A plurality of internal electrode patterns 20 that are divided into two internal electrodes 3a and 3b (FIGS. 1A and 1B) by being cut in the region 13, and one of the predetermined internal electrode patterns 20 Capacitance forming region 17a (1 7b) above the two extension lines X ′ and Y ′ (see FIG. 4) on one side and the other side, which are extended toward both sides of the capacitance forming portion region 17b (17a) on the other side. The ceramic green sheets 21 provided with the linear dummy electrode patterns 30 that do not contribute to capacitance formation are alternately shifted by a predetermined amount in the drawing direction of the internal electrodes 3a and 3b (FIG. 1). The mother laminate is formed by laminating and pressing. The internal electrode pattern 20 and the dummy electrode pattern 30 are preferably formed from the same material (conductive paste) from the viewpoint of simplifying the process, but may be formed from different materials.

  At this time, as shown in FIG. 4, the internal electrode patterns 20 (20a and 20b) facing each other through the ceramic green sheets are provided for the positional relationship of the internal electrode patterns 20 that are alternately stacked. Among the capacitance forming portion regions 17a and 17b, that is, the capacitance forming portion region 17b of the internal electrode pattern 20 (20a) and the capacitance forming portion region 17a of the internal electrode pattern 20 (20b) overlap each other, and the central lead portion region 13 1A, the lead portions 13a and 13b and the dummy electrodes 10 on both sides thereof are exposed from the end face of the ceramic multilayer element 1 as shown in FIG.

  Then, the mother laminated body configured as described above is cut at a predetermined position so that the lead-out region 13 at the center of the internal electrode pattern 20 is cut, and individual unfired ceramic laminated elements 1 (FIG. 5). ).

Then, after firing the ceramic multilayer element, a conductive paste is applied to the fired ceramic multilayer element, dried and baked to form an external electrode, and Ni plating for suppressing solder erosion on the surface of the external electrode An Sn plating film for improving the film and solderability is sequentially formed.
As a result, a multilayer ceramic capacitor having a structure as shown in FIGS. 1A, 1B, 1C and 2A, 2B is obtained.

  In the process of manufacturing the multilayer ceramic capacitor in this way, when the mother multilayer body is cut at a predetermined position and divided into individual unfired ceramic multilayer elements 1 (FIG. 5), the position of the internal electrode It is determined whether or not the deviation amount is within an allowable range.

That is, as shown in FIG. 5A, when both dummy electrodes 10 on both sides of the internal electrode lead-out portion 13a (13b) are detected, the positional deviation in the width direction of the internal electrodes 3a and 3b is within an allowable range. It is determined that there is.
On the other hand, as shown in FIG. 5B, when the distance (gap size) from the side surface of the ceramic multilayer element 1 to each of the dummy electrodes 10, 10 is different on both sides, the narrower gap size is measured. A determination is made whether it is within an acceptable range.
Further, as shown in FIG. 5C, when any one of the dummy electrodes 10 on both sides of the lead portion 13a (13b) of the internal electrode is not detected, the positional deviation in the width direction of the internal electrode exceeds the allowable range. It is determined that the capacitance forming portion of the internal electrode is exposed on the side surface of the ceramic multilayer element 1.

  As a result, it is possible to easily and reliably determine the presence or absence of misalignment exceeding the permissible range of the internal electrode (the quality of the internal electrode arrangement state), reliably removing defective products, and providing high reliability. It becomes possible to provide a multilayer ceramic capacitor.

  In addition, as shown in FIG. 5A and the like, when the ceramic multilayer element 1 includes the dummy electrode 10, the portion where the internal electrode is not disposed is reduced as compared with the case where the dummy electrode 10 is not included. Since pressure is uniformly applied during crimping, the occurrence of delamination can be suppressed.

  Further, in the case of the conventional structure not provided with the dummy electrode, there are portions where the internal electrode is not disposed on both sides of the lead portion, so that the shoulder portion of the ceramic multilayer element 51 is formed as shown in FIG. There is a problem that the mounting reliability is lowered due to the rounded shape. However, since the multilayer ceramic capacitor of the present invention has a dummy electrode, it is possible to prevent the shoulder of the ceramic multilayer element from being rounded. Thus, it is possible to prevent the occurrence of the above-described problem that has occurred in the conventional multilayer ceramic capacitor.

  In the above embodiment, a multilayer ceramic capacitor having a structure in which linear dummy electrodes are arranged on both sides of the lead portion of each internal electrode is shown. However, as will be described below, the arrangement of dummy electrodes It is possible to add various application modifications.

<Modification 1>
FIG. 6A is a diagram showing the shape and arrangement of the internal electrode pattern 20 and the dummy electrode pattern 30 before cutting in the lead portion region 13, and FIG. FIG. 3 is a diagram showing a configuration and a positional relationship between an internal electrode 3a (3b) and a dummy electrode 10 in a state divided into two.

  In this multilayer ceramic capacitor, as shown in FIG. 6 (b), the length of the dummy electrode 10 is set to an allowable amount of displacement in the direction in which the internal electrodes 3a and 3b (internal electrode 3a in FIG. 6 (b)) are pulled out. It is shorter.

As a result, by checking whether or not the dummy electrode 10 is exposed to the end face of the ceramic multilayer element 1, the positional deviation amount of the internal electrodes 3 a and 3 b (internal electrode 3 a in FIG. 6B) in the lead-out direction is allowed. It is possible to determine whether the value is within the range of the value (target value of the size of the gap G to be secured between the end of the internal electrode 3a (3b) and the end face of the ceramic multilayer element 1).
That is, when the amount of positional deviation in the lead-out direction of the internal electrode exceeds the allowable range, the position of the dummy electrode is also shifted by that amount, so that it is not exposed at the end face of the ceramic multilayer element 1, and the amount of positional deviation in the lead-out direction of the internal electrode is It is possible to detect that the allowable range is exceeded.

<Modification 2>
FIG. 7A is a diagram showing the shape and arrangement of the internal electrode pattern 20 and the dummy electrode pattern 30 before cutting in the lead portion region 13 of the multilayer ceramic capacitor according to Modification 2. FIG. 4B is a diagram showing the configuration and positional relationship between the internal electrode 3a (3b) and the dummy electrode 10 in a state of being divided into individual ceramic multilayer elements 1; 7A and 7B, the same reference numerals as those in FIGS. 6A and 6B denote the same or corresponding parts.

  In this multilayer ceramic capacitor, as shown in FIG. 7B, the second dummy electrode 10a having the same configuration as that of the first embodiment is disposed inside the dummy electrode 10 and shorter than the dummy electrode 10. Is arranged. Therefore, the positional deviation amount of the internal electrodes 3a and 3b (internal electrode 3a in FIG. 7B) in the lead-out direction is within an allowable range depending on whether or not the second dummy electrode 10a is exposed to the end face of the ceramic multilayer element 1. It is possible to determine whether or not it exists. A positional deviation exceeding the allowable range in the width direction of the internal electrode 3a (3b) can be detected by the dummy electrode 10.

<Modification 3>
FIG. 8A is a diagram showing the shapes and arrangement of the internal electrode pattern 20 and the dummy electrode pattern 30 before cutting in the lead region 13 of the multilayer ceramic capacitor according to Modification 3. FIG. 4B is a diagram showing the configuration and positional relationship between the internal electrode 3a (3b) and the dummy electrode 10 in a state of being divided into individual ceramic multilayer elements 1; 8A and 8B, the same reference numerals as those in FIGS. 6A and 6B denote the same or corresponding parts.

  In this multilayer ceramic capacitor, as shown in FIG. 8B, a dummy electrode 10 having a long length and a length as dummy electrodes on both sides of the lead portions 13a and 13b (the lead portion 13a in FIG. 8B) are used. Since the short dummy electrode 10 (10b) is disposed, the displacement of the internal electrodes 3a and 3b (internal electrode 3a in FIG. 8B) in the pulling direction is shifted to the shorter dummy electrode 10 ( 10b), and whether or not the internal electrode 3a (3b) is displaced in the width direction can be detected by the dummy electrode 10 having the longer length.

<Modification 4>
FIG. 9A is a diagram showing the shapes and arrangement of the internal electrode pattern 20 and the dummy electrode pattern 30 before cutting in the lead portion region 13 of the multilayer ceramic capacitor according to Modification 4. FIG. 4B is a diagram showing the configuration and positional relationship between the internal electrode 3a (3b) and the dummy electrode 10 in a state of being divided into individual ceramic multilayer elements 1; 9A and 9B, the same reference numerals as those in FIGS. 6A and 6B indicate the same or corresponding parts.

In this multilayer ceramic capacitor, as shown in FIG. 9B, the width of the dummy electrode 10 varies depending on the position of the internal electrodes 3a and 3b (internal electrode 3a in FIG. 9B) in the lead-out direction. It has a flat, triangular shape.
Therefore, when the positional deviation occurs in the direction in which the internal electrode is drawn, the width of the dummy electrode 10 exposed at the end face of the ceramic multilayer element 1 changes, so the width of the dummy electrode exposed at the end face of the ceramic multilayer element 1 is examined. Accordingly, it is possible to detect whether or not the internal electrode 3a (3b) is misaligned beyond the allowable range in the width direction and the amount of misalignment in the lead-out direction of the internal electrode 3a (3b).

<Modification 5>
FIG. 10 is a side cross-sectional view of a multilayer ceramic capacitor according to Modification 5. In this multilayer ceramic capacitor, as shown in FIG. 10, the dummy electrodes 10 are not disposed on both sides of each internal electrode 3a (3b), and the lead portions 13a and 13b of each internal electrode 3a (3b) are not provided. When the dummy electrode 10 is disposed only on one side and the lead portions of the pair of internal electrodes facing each other are viewed, the dummy electrode 10 is disposed on both sides thereof. Also in this configuration, it is possible to detect a positional shift in the width direction of the internal electrode.

<Modification 6>
FIG. 11 is a side sectional view of a multilayer ceramic capacitor according to Modification 6. In this multilayer ceramic capacitor, as shown in FIG. 11, the dummy electrode 10 is disposed only on one side of the lead portions 13a and 13b of the predetermined internal electrode 3a (3b), and the predetermined plurality of internal electrodes are viewed. In this case, the dummy electrode 10 is arranged on both sides. Also in this configuration, it is possible to detect a positional shift in the width direction of the internal electrode.

  The invention of the present application is not limited to the above-described embodiments and modifications, and various modifications can be made within the scope of the invention with respect to the specific shape and number of stacked internal electrodes and dummy electrodes, the arrangement of dummy electrodes, and the like. Application and deformation can be added.

In the present invention, one side and / or the other side of the two extension lines on one side and the other side, in which both sides of the capacitance forming portion of the predetermined internal electrode are extended in the direction of drawing out the internal electrode A dummy electrode that does not contribute to the capacitance formation is disposed so that at least a part of the dummy electrode is located on the extended line of the electrode. Since it is determined whether or not there is, it is possible to reliably detect a positional deviation exceeding the allowable range of the internal electrodes and reliably supply a highly reliable multilayer ceramic capacitor.
Therefore, the present invention can be widely applied to a multilayer ceramic capacitor having a structure in which the width of the lead portion of the internal electrode is narrower than that of the capacitance forming portion, and a method for manufacturing the same.

(a) is a perspective plan view showing the arrangement of internal electrodes and dummy electrodes of a ceramic multilayer element constituting a multilayer ceramic capacitor according to an embodiment of the present invention, and (b) is an exploded perspective view showing the shape of the internal electrodes. FIG. 4C is a cross-sectional view (side cross-sectional view) taken along the line CC of FIG. (a) is front sectional drawing of the multilayer ceramic capacitor concerning one Example of this invention, (b) is a perspective view. It is a top view which shows the shape and positional relationship of the internal electrode pattern and dummy electrode pattern which were arrange | positioned at the ceramic green sheet used for manufacture of the multilayer ceramic capacitor of this invention. It is a figure which shows the overlapping state of the internal electrode pattern and dummy electrode pattern which were arrange | positioned at the ceramic green sheet used for manufacture of the multilayer ceramic capacitor of this invention. (a), (b), (c) is a figure which shows the exposure state of the drawer | drawing-out part of the internal electrode to the end surface of the ceramic multilayer element which comprises the multilayer ceramic capacitor concerning one Example of this invention. (a) is a figure which shows the shape and arrangement | positioning aspect of the internal electrode pattern and dummy electrode pattern before cut | disconnecting in the extraction | drawer part area | region in the modification 1, (b) divided | segmented into each ceramic multilayer element It is a figure which shows the structure and positional relationship of a state internal electrode and a dummy electrode. (a) is a figure which shows the shape and arrangement | positioning aspect of an internal electrode pattern and a dummy electrode pattern before cut | disconnecting in the extraction | drawer part area | region in the modification 2, (b) was divided | segmented into each ceramic multilayer element It is a figure which shows the structure and positional relationship of a state internal electrode and a dummy electrode. (a) is a figure which shows the shape and arrangement | positioning aspect of the internal electrode pattern and dummy electrode pattern before cut | disconnecting in the extraction | drawer part area | region in the modification 3, (b) divided | segmented into each ceramic multilayer element It is a figure which shows the structure and positional relationship of a state internal electrode and a dummy electrode. (a) is a figure which shows the shape and arrangement | positioning aspect of the internal electrode pattern and dummy electrode pattern before cut | disconnecting in the extraction | drawer part area | region in the modification 4, (b) was divided | segmented into each ceramic laminated element It is a figure which shows the structure and positional relationship of a state internal electrode and a dummy electrode. It is a figure which shows the further another modification of the multilayer ceramic capacitor of this invention. It is a figure which shows the further another modification of the multilayer ceramic capacitor of this invention. (a) is front sectional drawing of the conventional multilayer ceramic capacitor, (b) is a perspective view. It is a figure which shows the shape of the internal electrode of the other conventional multilayer ceramic capacitor. It is side surface sectional drawing of the ceramic multilayer element for demonstrating the problem of the conventional multilayer ceramic capacitor.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Ceramic laminated element 2 Ceramic layer 3a, 3b Internal electrode 4a, 4b External electrode 5 Ni plating film 6 Sn plating film 7a, 7b Capacity | capacitance formation part 10 Dummy electrode 10a 2nd dummy electrode 10b Short dummy electrode 13 Lead-out part Region 13a, 13b Lead-out portion 17a, 17b Capacitance formation region 20 (20a, 20b) Internal electrode pattern 21 Ceramic green sheet 30 Dummy electrode pattern G Gap between end of internal electrode and end face of ceramic multilayer element X, Y Internal Extension lines X ', Y' from the electrode capacitance forming portion Extension lines from the capacitance forming portion region of the internal electrode pattern W ₁ , W ₀₁ Lead width W ₂ , W ₀₂ Capacitance formation width

Claims (7)

A plurality of internal electrodes are arranged so as to face each other through the ceramic layer, and external ends are connected to the internal electrodes at both end sides of the ceramic multilayer element in which one end side is alternately drawn to the end face on the different side. In a multilayer ceramic capacitor having a structure in which electrodes are arranged,
The width of the lead portion of the internal electrode to the end face of the ceramic multilayer element is formed narrower than the width of the capacitance forming portion that contributes to the capacitance formation of the internal electrode,
At least a part of one side and / or the other side of the extension line on one side and the other side of both sides of the capacitance forming portion of the predetermined internal electrode extending in the direction of drawing out the internal electrode. A dummy electrode that does not contribute to capacitance formation is disposed, and
When viewed with respect to one predetermined internal electrode and / or when viewed with respect to a plurality of predetermined internal electrodes, the dummy electrode is located on the extension line on one side and the extension line on the other side,
By examining the exposure state of the dummy electrode on the end face of the ceramic multilayer element, it is possible to determine whether or not at least the amount of positional deviation in the width direction of the internal electrode is within an allowable range. Multilayer ceramic capacitor.   2. The dummy electrode according to claim 1, wherein the dummy electrode is arranged on both one side and the other side of the extension of the capacitance forming portion of each internal electrode extending in the direction of drawing out the internal electrode. Multilayer ceramic capacitor.   As the dummy electrode, the length of the internal electrode in the lead-out direction is provided with a dummy electrode that is shorter than the positional deviation allowable range in the lead-out direction of the internal electrode, and depending on whether the dummy electrode is exposed to the end face of the ceramic multilayer element, 3. The multilayer ceramic capacitor according to claim 1, wherein the multilayer ceramic capacitor is configured so as to be able to determine whether or not a positional deviation amount in the lead-out direction of the internal electrode is within an allowable range.   The shape of the dummy electrode is shaped so that the width varies depending on the position of the internal electrode in the drawing direction, and the positional deviation amount in the drawing direction of the internal electrode is within an allowable range depending on the width of the dummy electrode exposed on the end face of the ceramic multilayer element. The multilayer ceramic capacitor according to claim 1, wherein the multilayer ceramic capacitor is configured so as to be able to determine whether or not the capacitor is present.   A second dummy electrode having a length shorter than that of the dummy electrode is disposed in parallel with the dummy electrode. Depending on whether the second dummy electrode is exposed on the end surface of the ceramic multilayer element, the second dummy electrode is exposed in the direction of drawing out the internal electrode. The multilayer ceramic capacitor according to claim 1, wherein the multilayer ceramic capacitor is configured to be able to determine whether or not the positional deviation amount is within an allowable range. A plurality of internal electrodes are arranged so as to face each other through the ceramic layer, and external ends are connected to the internal electrodes at both end sides of the ceramic multilayer element in which one end side is alternately drawn to the end face on the different side. In the method of manufacturing a multilayer ceramic capacitor having a structure in which electrodes are disposed,
A pair of capacitance forming region is provided at both ends, and a capacitance forming region at both ends is connected to the central portion, and has a leading portion region that is narrower than the width of the capacitance forming portion, and is cut at the leading portion region. And a plurality of internal electrode patterns divided into two internal electrodes and both sides of one capacitance forming portion region constituting the predetermined internal electrode pattern are extended toward both sides of the other capacitance forming portion region. The ceramic green sheets on which the dummy electrode patterns are arranged so that at least a part of the extension line on one side and / or the other side of the extension line on one side and / or the other side are located are alternately arranged. A step of forming a mother laminated body by laminating and crimping by a predetermined amount in the direction of the internal electrode drawing direction,
When the mother laminate is viewed at a predetermined position by cutting the mother stacked body at a predetermined position so that the lead-out region at the center of the internal electrode pattern is cut, and / Alternatively, when viewed with respect to a predetermined plurality of internal electrodes, the process of dividing the dummy electrode into individual unfired ceramic multilayer elements having a structure located on one extension line and on the other extension line;
Firing the green ceramic multilayer element;
And a step of forming an external electrode on the fired ceramic multilayer element.   7. The method of manufacturing a multilayer ceramic capacitor according to claim 6, wherein the ceramic green sheet is a ceramic green sheet in which dummy electrode patterns are disposed on both of the extension lines on the one side and the other side.

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