JP2004111608A - Laminated ceramic capacitor and method of manufacturing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a laminated ceramic capacitor which can prevent generation of internal voltage breakdown mainly generated from the starting point at the end part of an internal electrode and also provide a method of manufacturing the same laminated ceramic capacitor. <P>SOLUTION: The ceramic element formed using dielectric material ceramics having different dielectric strengths in the structure that a high dielectric strength region having the dielectric strength higher than the other region is provided and the end part of the internal electrode arranged in the ceramic element is located within the high dielectric strength region. Moreover, an internal electrode pattern is formed in the profile, where the end part is located on the higher dielectric strength region, on a ceramic green sheet (composite green sheet) provided with the dielectric strength region which is higher than the other region in the breakdown voltage, a plurality of sheets of this composite green sheet where the internal electrode pattern is formed are laminated and pressure-bonded in such positional relationship where each internal electrode pattern is provided at the predetermined position in order to form a laminated body. After this laminated green sheets are then sintered, an external electrode is formed. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a multilayer ceramic capacitor and a method of manufacturing the same, and more particularly, to a medium-to-high pressure type multilayer ceramic capacitor requiring a high withstand voltage and a method of manufacturing the same.
[0002]
[Prior art]
2. Description of the Related Art In recent years, the size and capacity of multilayer ceramic capacitors have been increasing due to miniaturization and surface mounting of electronic devices and the like. This trend has spread to medium- and high-voltage multilayer ceramic capacitors.For example, medium- and high-voltage multilayer ceramic capacitors, such as those for backlights of liquid crystal displays and switching power supplies, also need to be smaller and have larger capacities. It is supposed to be.
[0003]
In order to reduce the size and increase the capacity of the multilayer ceramic capacitor, it is necessary to make the ceramic layer (dielectric layer) thinner and more multilayer. However, if the ceramic layer becomes thinner, the pressure resistance is impaired. The fact is that it is difficult to increase the size and the capacity of the type of multilayer ceramic capacitor as compared with the low-voltage type.
[0004]
Incidentally, the internal voltage breakdown of the multilayer ceramic capacitor mainly occurs starting from the end of the internal electrode. This is because electric field concentration occurs at the end of the internal electrode.
On the other hand, the dielectric breakdown voltage increases as the loss decreases and the dielectric constant decreases, and the breakdown electric field strength increases.
[0005]
Therefore, as shown in FIG. 8, a low dielectric constant having a lower dielectric constant than the surrounding dielectric 51 is provided near an edge 52a of the internal electrode 52 provided in the dielectric 51 constituting the multilayer ceramic capacitor. A multilayer ceramic capacitor in which the provision of the portion 53 reduces the concentration of an electric field on the end portion 52a of the internal electrode 52 and suppresses the loss is disclosed (for example, see Patent Document 1).
[0006]
As shown in FIG. 9, on both upper and lower surfaces of a laminated body 63 in which dielectric layers 61 and internal electrode layers 62 are alternately laminated, the dielectric constant is lower than that of the dielectric layer 61 constituting the laminated body 63. A multilayer ceramic capacitor in which a plurality of dielectric layers 64 are provided to improve the creeping discharge resistance is disclosed (for example, see Patent Document 2).
[0007]
[Patent Document 1]
Japanese Patent Application Laid-Open No. 2000-331872 [Patent Document 2]
JP-A-9-320887
[Problems to be solved by the invention]
However, in the structure of the multilayer ceramic capacitor disclosed in Patent Document 1, a low dielectric constant portion 53 having a lower dielectric constant than the surrounding dielectric material 51 is provided near the edge 52a of the internal electrode 52. Since the end of the internal electrode is located in the dielectric material 51 having a low dielectric constant, the concentration of the electric field is reduced to some extent, but it is not always possible to obtain a sufficient effect of improving the breakdown voltage. is there.
[0009]
Further, in the structure of the multilayer ceramic capacitor of Patent Document 2, since the internal electrode layer 62 is located in the dielectric layer 61 whose dielectric constant is not low, the internal electrode layer 62 is mainly generated starting from the end of the internal electrode. It is difficult to sufficiently prevent internal voltage breakdown.
The present invention has been made in view of the above circumstances, and it is possible to prevent the occurrence of internal voltage destruction occurring mainly from the ends of the internal electrodes, and to provide a multilayer ceramic capacitor excellent in pressure resistance. It is an object of the present invention to provide a manufacturing method thereof.
[0010]
[Means for Solving the Problems]
In order to achieve the above object, a multilayer ceramic capacitor of the present invention (claim 1)
A multilayer ceramic capacitor having a structure in which a plurality of internal electrodes are stacked via a ceramic layer which is a dielectric inside a ceramic element,
The ceramic element is formed using dielectric ceramics with different withstand voltage, and has a high withstand voltage region with higher withstand voltage than other regions,
A tip of the internal electrode provided in the ceramic element is located in the high withstand voltage region.
[0011]
An internal electrode is arranged in a ceramic element having a high withstand voltage region having a higher withstand voltage than other regions, formed by using dielectric ceramics having different withstand voltage, and a tip portion of the internal electrode is provided with a high withstand region. By positioning it inside, it is possible to suppress and prevent the electric field from concentrating on the tip of the internal electrode, and to prevent the occurrence of internal voltage breakdown that occurs mainly from the end of the internal electrode. As a result, it is possible to improve the withstand voltage performance of the multilayer ceramic capacitor.
[0012]
Note that the dielectric breakdown voltage increases as the loss decreases and the dielectric constant decreases, and the breakdown electric field strength increases.Therefore, a ceramic dielectric with a low dielectric constant is used in the high withstand voltage region, and the dielectric breakdown voltage in other regions is increased. A ceramic dielectric having a higher dielectric constant than the ceramic dielectric forming the high breakdown voltage region is used.
[0013]
In the present invention, the tip of the internal electrode is a concept that means the end of the internal electrode that is not drawn out to the end face of the ceramic element, and both ends of the ceramic element like a floating internal electrode. When it is not drawn out to the end face, it is a concept meaning both ends.
Note that the internal electrodes are usually drawn out alternately to the opposite ends of the ceramic element, and the tips of the internal electrodes are located at the ends opposite to each other. It will be configured to be an area.
[0014]
The multilayer ceramic capacitor of the present invention (claim 2)
(A) a first extraction internal electrode connected to one external electrode and a second extraction internal electrode connected to the other external electrode, which are disposed on one plane in the ceramic element; (B) a floating electrode layer formed of a floating internal electrode that is not connected to an external electrode and is disposed on one plane different from the plane on which the extraction electrode layer is disposed in the ceramic element; Each capacitor, which is alternately disposed via a certain ceramic layer, and is formed from the extraction electrode layer and the floating electrode layer, is connected in series between a pair of external electrodes disposed on both ends of the ceramic element. A multilayer ceramic capacitor configured as follows,
The ceramic element is formed of a dielectric material having a different withstand voltage, and includes a high withstand voltage region having a higher withstand voltage than other regions.
At least the end portions of the first and second lead internal electrodes and both end portions of the floating internal electrode are located in the high withstand voltage region.
[0015]
As described above, the first extraction internal electrode connected to one external electrode, the extraction electrode layer including the second extraction internal electrode connected to the other external electrode, and the plane on which the extraction electrode layer is disposed The floating electrode layers composed of floating internal electrodes that are not connected to the external electrodes and are arranged alternately via a ceramic layer that is a dielectric, and are arranged alternately via a ceramic layer that is a dielectric. In a multilayer ceramic capacitor configured so that each formed capacitor is connected in series between a pair of external electrodes disposed on both ends of a ceramic element, at least the tip of the first and second lead internal electrodes In addition, even when both ends of the floating internal electrode are located in the high withstand voltage region, the concentration of the electric field at the tip of the internal electrode is suppressed and prevented, and the internal electrode is mainly It is possible to prevent the occurrence of internal voltage breakdown which occurs the end as a starting point, it is possible to improve the pressure resistance of the monolithic ceramic capacitor.
[0016]
Further, in the multilayer ceramic capacitor of the present invention, a floating internal electrode is disposed on the same plane between the first and second lead internal electrodes, and both ends of the floating internal electrode are in the high withstand voltage region. It is characterized by being located.
[0017]
Even in a multilayer ceramic capacitor having a structure in which a floating internal electrode is also provided on the same plane between the first and second lead internal electrodes, by positioning both ends of the floating internal electrode in the high breakdown voltage region, the internal By suppressing and preventing the electric field from concentrating on the tip of the electrode, it is possible to prevent the occurrence of internal voltage breakdown mainly from the end of the internal electrode, and the withstand voltage performance of the multilayer ceramic capacitor Can be improved.
[0018]
Further, the method for manufacturing a multilayer ceramic capacitor according to the present invention (claim 4) includes:
A method for manufacturing a multilayer ceramic capacitor having a structure in which a plurality of internal electrodes are stacked via a ceramic layer which is a dielectric inside a ceramic element,
The tip is formed on a ceramic green sheet provided with a high withstand voltage region having a higher withstand voltage than other regions when formed using dielectric ceramics having different withstand voltage and viewed in a plan view. Forming an internal electrode pattern in such a manner as to be located in,
The step of forming a laminate by laminating a plurality of ceramic green sheets on which the internal electrode patterns are formed so that each internal electrode pattern has a predetermined positional relationship, and pressing and bonding.
Baking the laminate to form a ceramic element having a structure in which a plurality of internal electrodes are disposed inside so as to face each other via a ceramic layer that is a dielectric;
Applying a conductive paste to the ceramic element and subjecting the paste to a heat treatment to bake the conductive paste to form external electrodes.
[0019]
A tip (a multilayer ceramic capacitor having a floating internal electrode) is formed on a ceramic green sheet that is formed from a plurality of materials having different withstand voltages and has a high withstand voltage region that is higher than other regions when viewed in plan. In the case of manufacturing the same, the internal electrode pattern is formed in such a manner that both end portions are located on the high withstand voltage region, and the ceramic green sheet on which the internal electrode pattern is formed is formed into a predetermined shape. By stacking a plurality of sheets so as to be in a positional relationship and pressing them to form a stacked body, the tip of the internal electrode (both ends in the case of having a floating internal electrode) is made of a dielectric ( (High breakdown voltage region), it is possible to prevent the occurrence of internal voltage destruction that mainly occurs from the end of the internal electrode as a starting point, and it is a multilayer ceramic with high withstand voltage performance Capacitor becomes possible to efficiently and reliably manufactured.
[0020]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described, and features thereof will be described in more detail.
[0021]
[Embodiment 1]
In the multilayer ceramic capacitor according to the first embodiment, as shown in FIG. 1, a plurality of internal electrodes 2a and 2b are arranged inside a ceramic element 1 via a ceramic layer 3 which is a dielectric. Internal electrodes 2a and 2b opposed to each other are alternately drawn to opposite end surfaces 1a and 1b of ceramic element 1 and connected to external electrodes 4a and 4b formed on the end surfaces. .
[0022]
In the multilayer ceramic capacitor according to the first embodiment, both ends of the ceramic element 1 from which the internal electrodes 2a and 2b are drawn out have a higher pressure resistance than the dielectric (ceramic) constituting the other parts. The high-voltage region 15 made of a large dielectric (ceramic) and having the tips P (ends opposite to the lead-side end) P of the internal electrodes 2a and 2b formed of the high-voltage dielectric. Located inside.
[0023]
Next, a method of manufacturing the multilayer ceramic capacitor will be described.
(1) First, a slurry A is prepared by adding a solvent, an organic binder, a dispersant, and a plasticizer to a ceramic raw material powder having a dielectric constant of 3000 and mainly having a dielectric constant of BaTiO ₃ .
(2) On the other hand, a solvent, an organic binder, a dispersant, and a plasticizer were added to a ceramic raw material powder having a dielectric constant of 300 (high-pressure resistant ceramic raw material powder) containing BaTiO ₃ as a main component and Ca and Mg added thereto. A slurry B is prepared.
(3) Then, as shown in FIGS. 2 (a) and 2 (b), the slurry dam 11 for storing the slurry is partitioned into three regions R ₁ , R ₂ and R ₃ by providing a partition plate 12, and the slurry dam is formed. It was charged a in the region _{R 2,} introducing a slurry B in the region _R 1, _{R 3} each slurry dam 11.
Then, as shown in FIG. 2A, a composite green sheet 13 made of a low dielectric constant material (high withstand voltage material) and a high dielectric constant material (low withstand voltage material) is manufactured by a doctor blade method.
As shown in FIG. 3, the composite green sheet 13 includes a high withstand voltage region 15 having higher withstand voltage than other regions and a low withstand voltage region 16 as another region when viewed in plan.
(4) Next, an internal electrode pattern 17 as shown in FIG. 4 is formed by printing an internal electrode paste mainly composed of Ag-Pd on the composite green sheet 13 in a predetermined pattern. At this time, the tip 17 a (P) of the internal electrode pattern 17 is located on the high withstand voltage region 15.
(5) Then, as shown in FIG. 3, several composite green sheets 13 (13a) (green sheets for the outer layer) on which the internal electrode pattern is not formed are stacked, and then the internal green is formed in a pattern as shown in FIG. The composite green sheet 13 (13b) (green sheet for the inner layer) on which the electrode pattern 17 is printed is stacked in multiple layers, and the composite green sheet 13 for the outer layer where the internal electrode pattern is not formed as shown in FIG. Several layers of (13a) are stacked and pressed to form a laminate (pressure-bonded laminate).
(6) Then, after the pressure-bonded laminate is cut at a predetermined position and divided into individual elements, degreased at about 400 ° C. and fired at 1200 to 1300 ° C. to form the ceramic element 1.
(7) After firing, a conductive paste for an external electrode is applied to a region including both end surfaces of the ceramic element 1 and baked, and a Ni plating film and a Sn plating film are sequentially formed to form the external electrodes 4a and 4b. Formed. Thus, a multilayer ceramic capacitor (Example) as shown in FIG. 1 was obtained.
[0024]
For comparison, only ceramic green sheets made of the above-mentioned slurry A prepared by adding a solvent, an organic binder, a dispersant, and a plasticizer to a ceramic raw material powder having a dielectric constant of 3000 and having a dielectric constant of 3,000 mainly composed of BaTiO ₃ were used. Thus, a multilayer ceramic capacitor (comparative example) as shown in FIG. 5 was produced. Note that, in FIG. 5, portions denoted by the same reference numerals as those in FIG. 1 indicate the same or corresponding portions.
[0025]
Then, the DC breakdown voltage of the multilayer ceramic capacitors of the embodiment and the comparative example was examined.
The conditions are as follows.
(A) Dimension length of multilayer ceramic capacitor L = 3.2 mm
Width W = 1.6mm
(B) Internal electrode dimensions 2.6 mm (L) x 0.8 (W) mm
(C) Thickness (element thickness) of a ceramic layer between a pair of opposing internal electrodes
30 μm
[0026]
As a result, in the case of the multilayer ceramic capacitor of the comparative example, the DC breakdown voltage was 1.5 kV, whereas in the case of the multilayer ceramic capacitor of the example, the DC breakdown voltage was 1.8 kV. It was confirmed that the multilayer ceramic capacitor of the example had a higher breakdown voltage than the multilayer ceramic capacitor of the comparative example. In addition, the destruction mode was internal destruction in both the examples and the comparative examples.
[0027]
As described above, the internal electrodes 2a and 2b are arranged in the ceramic element 1 having the high withstand voltage region 15 having higher withstand voltage than other regions, formed by using dielectric ceramics having different withstand voltage. By locating the tips P of the internal electrodes 2a, 2b in the high withstand voltage region 15, the concentration of the electric field on the tips P of the internal electrodes 2a, 2b is suppressed and prevented, and the end of the internal electrodes is mainly It is possible to prevent the occurrence of internal voltage destruction occurring from the portion as a starting point, and it is possible to improve the breakdown voltage performance of the multilayer ceramic capacitor.
[0028]
[Embodiment 2]
FIG. 6 is a view showing a multilayer ceramic capacitor according to another embodiment of the present invention.
As shown in FIG. 6, the multilayer ceramic capacitor according to the second embodiment has a first lead internal electrode 22a connected to one external electrode 4a and a second internal electrode 22a provided on one plane in the ceramic element 1. An extraction electrode layer 23 composed of a second extraction internal electrode 22b connected to the external electrode 4b, and an external electrode disposed on one plane different from the plane on which the extraction electrode layer 23 is disposed in the ceramic element 1. Floating electrode layers 25 composed of floating internal electrodes 24 not connected to the electrodes 4a and 4b are alternately arranged via the ceramic layer 3 which is a dielectric, and the lead electrode layers 23 and the floating electrode layers 25 Each formed capacitor is configured to be connected in series between a pair of external electrodes 4a and 4b disposed on both ends of the ceramic element 1.
[0029]
In this multilayer ceramic capacitor, the ceramic element 1 includes a high withstand voltage region 15 having a higher withstand voltage than other regions and a low withstand voltage region 16 which is another region, which is formed of a dielectric having a different withstand voltage. In addition, at least the leading end P of the first and second lead-out internal electrodes 22 a and 22 b and both ends P ₁ and P _{2 of the} floating internal electrode are located in the high withstand voltage region 15.
[0030]
In addition, this multilayer ceramic capacitor prepares a composite green sheet having a high breakdown voltage region and a low breakdown voltage region that is another region, and forms an internal electrode pattern for a drawn internal electrode on a predetermined composite green sheet, On other predetermined composite green sheets, an internal electrode pattern for a floating internal electrode is formed, and a composite green sheet on which an internal electrode pattern is printed with these patterns, and a green for an outer layer on which the internal electrode pattern is not printed. After laminating the sheets and pressing them to form a laminate, the laminate is cut at a predetermined position and divided into individual elements. Then, degreasing, firing, and external processing are performed in the same manner as in the first embodiment. It can be manufactured through steps such as the shape of the electrode.
[0031]
As described above, the first extraction internal electrode connected to one external electrode, the extraction electrode layer including the second extraction internal electrode connected to the other external electrode, and the plane on which the extraction electrode layer is disposed Is a multilayer ceramic capacitor in which floating electrode layers formed of floating internal electrodes that are not connected to external electrodes and disposed on one different plane are alternately disposed via ceramic layers that are dielectrics. The electric field concentrates on the tip of the internal electrode even when at least the tip of the end on the extraction side and both ends of the floating internal electrode are located in the high withstand voltage region. To prevent the occurrence of internal voltage destruction that occurs mainly from the ends of the internal electrodes, thereby improving the withstand voltage performance of the multilayer ceramic capacitor. That.
[0032]
[Embodiment 3]
FIG. 7 is a view showing a multilayer ceramic capacitor according to still another embodiment of the present invention.
Note that, in FIG. 7, the portions denoted by the same reference numerals as those in FIG. 6 indicate the same or corresponding portions as those in FIG.
[0033]
Like the monolithic ceramic capacitor of the third embodiment, the monolithic ceramic capacitor having a structure in which the floating internal electrode 24a is also arranged on the same plane between the first and second lead-out internal electrodes 22a and 22b, By locating both ends P ₁ and P ₂ of the electrode 24 a in the high withstand voltage region 15, concentration and concentration of an electric field at the tip of the internal electrode is suppressed and prevented, and mainly the end of the internal electrode is used as a starting point. Thus, it is possible to prevent the occurrence of internal voltage destruction, and to obtain a multilayer ceramic capacitor having high withstand voltage.
[0034]
The invention of the present application is not limited to the above embodiment, but includes the type of ceramic constituting the ceramic element, the electrode material constituting the internal electrode, the arrangement mode and the specific pattern shape of the internal electrode, and the internal electrode. Regarding the number of layers, various applications and modifications can be made within the scope of the invention.
[0035]
【The invention's effect】
As described above, the multilayer ceramic capacitor of the present invention (claim 1) is a ceramic element having a high withstand voltage region having a higher withstand voltage than other regions, formed using dielectric ceramics having different withstand voltage. In addition to the internal electrodes being arranged, the tip of the internal electrode is located in the high withstand voltage region, so that the concentration of the electric field at the tip of the internal electrode is suppressed and prevented, and the internal electrode is mainly used. Of the multilayer ceramic capacitor can be prevented, and the withstand voltage performance of the multilayer ceramic capacitor can be improved.
[0036]
Further, as in the multilayer ceramic capacitor of the present invention (claim 2), a lead electrode layer including a first lead internal electrode connected to one external electrode and a second lead internal electrode connected to the other external electrode. And a floating electrode layer formed of a floating internal electrode that is not connected to an external electrode and disposed on a plane different from the plane on which the extraction electrode layer is disposed alternately via a ceramic layer that is a dielectric. A multilayer ceramic capacitor arranged so that each capacitor formed from the extraction electrode layer and the floating electrode layer is connected in series between a pair of external electrodes provided at both ends of the ceramic element; In the above, even when at least the end portions of the first and second extraction internal electrodes and both end portions of the floating internal electrode are located in the high withstand voltage region, the internal electrode By suppressing and preventing the electric field from concentrating at the ends, it is possible to prevent the occurrence of internal voltage destruction that occurs mainly from the ends of the internal electrodes, improving the withstand voltage performance of multilayer ceramic capacitors. It becomes possible to do.
[0037]
Also, in the multilayer ceramic capacitor having a structure in which a floating internal electrode is further provided on the same plane between the first and second lead internal electrodes as in the multilayer ceramic capacitor of claim 3, By locating both ends in the high withstand voltage region, the concentration of the electric field at the tip of the internal electrode is suppressed and prevented, and the occurrence of internal voltage breakdown mainly from the end of the internal electrode as a starting point is reduced. This makes it possible to improve the withstand voltage performance of the multilayer ceramic capacitor.
[0038]
Further, the manufacturing method of the multilayer ceramic capacitor according to the present invention (claim 4) includes a high withstand voltage region formed from a plurality of materials having different withstand voltages and having a higher withstand voltage than other regions when viewed in plan. An internal electrode pattern is formed on the ceramic green sheet in such a manner that the end portions (both ends in the case of manufacturing a multilayer ceramic capacitor having a floating internal electrode) are positioned on the high withstand voltage region. Since a plurality of ceramic green sheets on which the electrode patterns are formed are laminated and pressed together so that each internal electrode pattern has a predetermined positional relationship, a laminated body is formed. In the case of having an electrode, both ends of the electrode have a structure that is located in a dielectric material with a high withstand voltage (high withstand voltage region), and mainly occurs starting from the end of the internal electrode. That is possible to prevent the occurrence of internal voltage breakdown, it is possible to manufacture a highly laminated ceramic capacitor pressure resistance efficiently and reliably.
[Brief description of the drawings]
FIG. 1 is a sectional view showing a multilayer ceramic capacitor according to an embodiment (Embodiment 1) of the present invention.
FIGS. 2A and 2B are diagrams showing a state in which a composite green sheet is being manufactured in a manufacturing process of a multilayer ceramic capacitor according to an embodiment (Embodiment 1) of the present invention; FIG. Is a plan view, and (b) is a front sectional view.
FIG. 3 is a view showing a composite green sheet formed in a manufacturing process of the multilayer ceramic capacitor according to one embodiment (Embodiment 1) of the present invention.
FIG. 4 is a diagram showing a state in which an internal electrode pattern is formed on a composite green sheet formed in a manufacturing process of the multilayer ceramic capacitor according to one embodiment (Embodiment 1) of the present invention.
FIG. 5 is a cross-sectional view showing a conventional multilayer ceramic capacitor (comparative example).
FIG. 6 is a sectional view showing a multilayer ceramic capacitor according to another embodiment (Embodiment 2) of the present invention.
FIG. 7 is a sectional view showing a multilayer ceramic capacitor according to still another embodiment (Embodiment 3) of the present invention.
FIG. 8 is a sectional view showing a conventional multilayer ceramic capacitor.
FIG. 9 is an exploded perspective view showing another conventional multilayer ceramic capacitor.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Ceramic element 1a, 1b Both end surfaces 2a, 2b of ceramic element Internal electrode 3 Ceramic layer 4a, 4b External electrode 11 Slurry dam 12 Partition plate 13 Composite green sheet 13a, 13c Composite green sheet 13b for outer layer Composite green sheet for inner layer Reference Signs List 15 High withstand voltage region 16 Low withstand voltage region 17 Internal electrode pattern 17a Front end portion 22a of internal electrode pattern First lead internal electrode 22b Second lead internal electrode 23 Lead electrode layers 24, 24a Floating internal electrode 25 Floating electrode layers A, B Slurry P Tip of the internal electrode (end opposite to the end on the drawer side)
Sections of both ends R ₁ , R ₂ , R _{3 of the} P ₁ , P ₂ floating internal electrode slurry dam

Claims (4)

A multilayer ceramic capacitor having a structure in which a plurality of internal electrodes are stacked via a ceramic layer which is a dielectric inside a ceramic element,
The ceramic element is formed using dielectric ceramics with different withstand voltage, and has a high withstand voltage region with higher withstand voltage than other regions,
A multilayer ceramic capacitor, wherein a tip end of an internal electrode provided in the ceramic element is located in the high withstand voltage region. (A) a first extraction internal electrode connected to one external electrode and a second extraction internal electrode connected to the other external electrode, which are disposed on one plane in the ceramic element; (B) a floating electrode layer formed of a floating internal electrode that is not connected to an external electrode and is disposed on one plane different from the plane on which the extraction electrode layer is disposed in the ceramic element; Each capacitor, which is alternately disposed via a certain ceramic layer, and is formed from the extraction electrode layer and the floating electrode layer, is connected in series between a pair of external electrodes disposed on both ends of the ceramic element. A multilayer ceramic capacitor configured as follows,
The ceramic element is formed of a dielectric material having a different withstand voltage, and includes a high withstand voltage region having a higher withstand voltage than other regions.
A multilayer ceramic capacitor, wherein at least a tip portion of each of the first and second lead internal electrodes and both end portions of the floating internal electrode are located in the high withstand voltage region. The floating internal electrode is disposed on the same plane between the first and second lead internal electrodes, and both ends of the floating internal electrode are located in the high breakdown voltage region. 2. The multilayer ceramic capacitor according to 2. A method for manufacturing a multilayer ceramic capacitor having a structure in which a plurality of internal electrodes are stacked via a ceramic layer which is a dielectric inside a ceramic element,
The tip is formed on a ceramic green sheet provided with a high withstand voltage region having a higher withstand voltage than other regions when formed using dielectric ceramics having different withstand voltage and viewed in a plan view. Forming an internal electrode pattern in such a manner as to be located in,
A step of laminating a plurality of ceramic green sheets on which the internal electrode patterns are formed so that each internal electrode pattern has a predetermined positional relationship, and pressing and forming a laminate.
Baking the laminate to form a ceramic element having a structure in which a plurality of internal electrodes are disposed so as to face each other via a ceramic layer that is a dielectric,
Applying a conductive paste to the ceramic element and subjecting the paste to a heat treatment, thereby baking the conductive paste to form external electrodes.

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