WO2007060774A1

WO2007060774A1 - Ceramic electronic part

Info

Publication number: WO2007060774A1
Application number: PCT/JP2006/316466
Authority: WO
Inventors: Masahiro Matsuo
Original assignee: Murata Manufacturing Co., Ltd.
Priority date: 2005-11-28
Filing date: 2006-08-23
Publication date: 2007-05-31
Also published as: JP4697231B2; CN101273421A; TWI313015B; TW200721210A; JPWO2007060774A1; CN101273421B

Abstract

A ceramic electronic part that permits identifying of the orientation of the ceramic electronic part through the use of a marker provided thereinside, and that avoids drop of reliability through inhibition of any diffusion of coloring component from the marker. Stator (101) constituting part of a trimmer condenser is disposed between ceramic sintered body (103) composed of, superimposed one upon another, multiple ceramic layers (102) and ceramic layer (102). The stator (101) includes internal conductor (104) drawn out to a side face of the ceramic sintered body (103); external conductor (105a) provided on a side face of the ceramic sintered body (103) and electrically connected to the internal conductor (104); external conductor (105b) provided on a side face of the ceramic sintered body (103) opposite to the side face provided with the external conductor (105a); and black ceramic layer (106) disposed between ceramic layers (102). The black ceramic layer (106) contains an Mn oxide and an Fe oxide in a weight ratio of 3:2 to 1:3 in terms of MnCO3 and Fe2O3, respectively. The internal conductor (104) and the black ceramic layer (106) are arranged in such a fashion that in the direction of ceramic layer (102) lamination, they substantially do not overlap each other.

Description

Specification

Ceramic electronic components

Technical field

TECHNICAL FIELD [0001] The present invention relates to a ceramic electronic component that needs to identify the orientation of the component in terms of assembly and mounting, and more particularly to a ceramic electronic component such as a trimmer capacitor in which an internal conductor is unevenly distributed.

Background art

FIG. 7 is a schematic cross-sectional view showing a conventional trimmer capacitor. As shown in FIG. 7, the trimmer capacitor 500 includes a ceramic sintered body 503 in which a plurality of ceramic layers 502 are laminated, and an internal structure that is disposed between the ceramic layers 502 and drawn to the side surface of the ceramic sintered body 503. A stator 501 is provided which includes a conductor 504, outer conductors 505a and 505b formed on a side surface of the ceramic sintered body 503, and the like. In addition, a metal rotor 507 is disposed on the upper portion of the stator 501, and terminal electrodes 508 and protrusions 509 formed on the lower portion of the rotor 507 are in contact with the upper surface of the ceramic sintered body 503. The rotor 507 is covered with a metal cover 511 via a spring washer 510. A terminal 512 formed by extending a part of the metal cover 511 is electrically connected to the external conductor 505b on the side surface of the ceramic sintered body 503. The metal cover 511 is provided with a through hole 513, and a screwdriver is inserted into the driver groove 514 formed in the rotor 507 through the through hole 513.

[0003] In trimmer capacitor 500, the force by which a capacitance is formed between internal conductor 504 and terminal electrode 508 cannot form a desired capacitance if the ceramic sintered body is turned upside down. Therefore, when the ceramic sintered body 503 and the metal cover 511 are joined, a mark (marker) for identifying the upper and lower sides of the ceramic sintered body 503 is required.

[0004] In order to solve such a problem, in Patent Document 1, TiO and Mn are interposed between ceramic layers.

twenty three

A ceramic paste containing O is printed and baked to form a marker.

Four

It has been proposed to identify the top and bottom of electronic components.

Patent Document 1: Japanese Utility Model Publication 7-47862

Disclosure of the invention Problems to be solved by the invention

However, in Patent Document 1, the marker formed between the ceramic layers and the internal electrode formed between the ceramic layers are arranged so as to overlap in the stacking direction of the ceramic layers. For this reason, the portion where the marker and the internal electrode overlap with each other becomes thicker than other portions, which may cause structural defects in the ceramic sintered body. In addition, the marker strength coloring component may diffuse into the ceramic layer and reach the internal electrode during baking, which may reduce the reliability of the ceramic electronic component.

[0006] In order to suppress the diffusion of the coloring component, it is considered that a marker may be formed on the surface of the ceramic sintered body after the ceramic sintered body is produced. As described, problems such as mounting defects may occur.

[0007] The present invention solves the above-described problem, and can identify the directionality of the ceramic electronic component by the marker formed inside, and can diffuse the coloring component from the marker. It is an object to provide a ceramic electronic component which is suppressed and reliability is not lowered.

Means for solving the problem

[0008] A ceramic electronic component according to the present invention comprises a ceramic sintered body comprising a plurality of ceramic layers containing La oxide and Ti oxide, and having one main surface, the other main surface, and side surfaces; An inner conductor disposed between the ceramic layers and drawn out to a side surface of the ceramic sintered body; an outer conductor formed on a side surface of the ceramic sintered body and electrically connected to the inner conductor; Mn oxide and Fe oxide are converted into MnCO equivalents between the layers of the ceramic layer and on one main surface side of the ceramic sintered body from the middle point of the thickness of the ceramic sintered body. , So as to have a weight ratio of 3: 2 to 1: 3 in terms of Fe O

3 2 3

A black ceramic layer is disposed, and the inner conductor and the black ceramic layer are disposed so as not to substantially overlap in the stacking direction of the ceramic layers.

[0009] It is preferable that the inner conductor is disposed on the other main surface side of the ceramic sintered body from a middle point of the thickness of the ceramic sintered body.

[0010] In the ceramic electronic component according to the present invention, the other main body of the ceramic sintered body. A terminal electrode may be provided outside the ceramic sintered body so as to be in contact with the surface and to face the internal conductor.

[0011] The terminal electrode may be provided so as to be slidably in contact with the other main surface of the ceramic sintered body.

[0012] The ceramic layer may have a dielectric force, and a capacitor may be formed between the inner conductor and the terminal electrode.

The invention's effect

In the present invention, Mn oxide and Fe oxide are converted into MnCO equivalent and Fe O equivalent, respectively.

The black ceramic layer contained in 3 2 3 so as to have a weight ratio of 3: 2 to 1: 3 serves as a marker. The Mn oxide and Fe oxide contained in this black ceramic layer react with La oxide and Ti oxide contained in the adjacent ceramic layer, and as a result, LaFe is present at the interface between the black ceramic layer and the ceramic layer. Ti 2 O phase is formed. This LaFe Ti O phase itself is black

4 6 19 4 6 19

Therefore, it assists the color development of the black ceramic layer and plays a role in preventing the coloring component from spreading into the ceramic layer.

[0014] In addition, Mn oxide and Fe oxide are respectively MnCO converted and Fe O converted 3: 2-1

3 2 3

When contained so as to have a weight ratio of 3, it is possible to exhibit an appropriate color and to prevent warpage of the ceramic sintered body.

Brief Description of Drawings

1 is a schematic cross-sectional view and a schematic bottom view showing a stator that constitutes a part of a trimmer capacitor in Embodiment 1. FIG.

2 is a schematic cross-sectional view showing a trimmer capacitor using the stator 101 shown in FIG.

FIG. 3 is a schematic cross-sectional view and a schematic bottom view showing a stator that constitutes a part of the trimmer capacitor in Embodiment 2.

4 is a schematic cross-sectional view showing a trimmer capacitor using the stator 201 shown in FIG.

FIG. 5 is a schematic sectional view showing a ceramic sintered body used in Experimental Example 1.

FIG. 6 is a schematic cross-sectional view showing an unfired ceramic laminate used in Experimental Example 2.

FIG. 7 is a schematic cross-sectional view showing a conventional trimmer capacitor.

Explanation of symbols o

Trimmer Capacitor (Ceramic Electronics Port ¾)

1001 Stator

Yes

102 Ceramic layer

103 Ceramic sintered body

104 Inner conductor

105a, 105b Outer conductor

106 Black ceramic layer

200 Trimmer Capacitor (Ceramic Electronics Port ¾)

201 stator

202 Ceramic layer

203 Ceramic sintered body

204a, 204b Inner conductor

205a, 205b Outer conductor

206 Black ceramic layer

303 Ceramic sintered body

304 Inner conductor

306 Black ceramic layer

BEST MODE FOR CARRYING OUT THE INVENTION

[0017] (Embodiment 1)

FIG. 1 is a schematic sectional view and a schematic bottom view showing a stator constituting a part of the trimmer capacitor in the present embodiment. As shown in FIG. 1, the stator 101 is disposed between the ceramic sintered body 103 in which a plurality of ceramic layers 102 are laminated and the ceramic layer 102, and is drawn out to the side surface of the ceramic sintered body 103. The inner conductor 104 is formed on the side surface of the ceramic sintered body 103, and the outer conductor 105a electrically connected to the inner conductor 104 is opposed to the side surface of the ceramic sintered body 103 where the outer conductor 105a is formed. An outer conductor 105b formed on the side surface, and a black ceramic layer 106 disposed between the ceramic layers 102.

[0018] The ceramic layer 102 contains La oxide and Ti oxide. Such as ceramic For example, CaO-La O—TiO—Nd O-based ceramics, BaO—TiO—La O—N

2 3 2 2 3 2 2 3 Doo ceramics can be used.

twenty three

The internal conductor 104 is disposed so as not to overlap the black ceramic layer 106 in the stacking direction of the ceramic layers 102. For this reason, a portion where the internal conductor 104 and the black ceramic layer 106 overlap is suppressed from being locally thick, and structural defects of the ceramic sintered body 103 can be prevented.

Further, as shown in FIG. 1, the internal conductor 104 is disposed on the bottom surface side of the ceramic sintered body 103 from the midpoint of the thickness of the ceramic sintered body 103 (distance from the top surface to the bottom surface). I like it. This makes it easier to form a capacitance in a trimmer capacitor described later.

[0021] As the internal electrode 104, for example, gold, silver, copper, iron << radium, silver Z palladium alloy, nickel, etc. can be used.

[0022] As the outer conductors 105a and 105b, for example, gold, silver, noradium, silver Z palladium alloy, or the like can be used.

The black ceramic layer 106 functions as a marker that indicates the upper and lower sides of the ceramic sintered body 103. Since it is black, even if the ceramic sintered body 103 is made of a dark ceramic such as green or brown, it can be identified as a marker. As shown in FIG. 1, the color indication of the black ceramic layer 106 can be clearly identified from the bottom surface of the ceramic sintered body 103. Although not shown, the black ceramic layer 106 appears lighter than the color at which the bottom force can be seen from the upper surface of the ceramic sintered body 103 or not at all. This difference in appearance makes it possible to determine that the black ceramic layer 106 is located on the bottom surface side (one main surface side) of the ceramic sintered body 103.

[0024] The black ceramic layer 106 contains Mn oxide and Fe oxide in terms of MnCO, F

It is contained so as to be a weight ratio of 3: 2 to 1: 3 in terms of 3 e O. Mn acid is more than this ratio

twenty three

When the amount of Fe oxide is decreased, the ceramic sintered body 103 may be deformed or the black ceramic layer 106 may be identified from the upper surface of the ceramic sintered body 103 due to excessive diffusion of the Mn component. On the other hand, when the amount of Mn oxide is less than this ratio and the amount of Fe oxide is increased, the black color becomes too strong, and this also causes the black ceramic layer 106 to be formed from the upper surface of the ceramic sintered body 103. May be identified. [0025] The stator 101 is manufactured as follows, for example. First, a ceramic slurry in which ceramic powder, an organic binder, and a solvent are mixed is formed into a sheet shape, and a ceramic green sheet constituting the ceramic layer 102 after firing is produced.

[0026] Next, a metal powder, an organic binder, and a solvent are mixed to produce a conductive paste that constitutes the internal conductor 104 after firing, and is printed on the ceramic green sheet. In addition, ceramic paste containing La oxide and Ti oxide, organic noda, and solvent are mixed to produce a ceramic paste constituting the black ceramic layer 106 after firing, and printed on the ceramic dust sheet. To do. At this time, the ratio of the ceramic powder in the ceramic paste is preferably 30 to 70% by weight. If it is less than 30% by weight, the color may not be sufficiently developed. If it exceeds 70% by weight, it may be difficult to produce a paste.

Next, ceramic green sheets are laminated to produce an unfired ceramic laminate.

Next, the unfired ceramic laminate is fired to obtain a fired ceramic laminate. Next, a metal powder, an organic binder, and a solvent are mixed to produce a conductive paste constituting the external conductors 105a and 105b after firing, and a conductive paste is baked on the side surface of the fired ceramic laminate. Outer conductors 105a and 105b are formed.

FIG. 2 is a schematic cross-sectional view showing a trimmer capacitor using the stator 101 shown in FIG. As shown in FIG. 2, in the trimmer capacitor 100, a metal rotor 107 is disposed on the upper portion of the stator 101, and the terminal electrode 108 and the protrusion 109 formed on the lower portion of the rotor 107 are connected to one main surface of the ceramic sintered body 103. It touches. The rotor 107 is covered with a metal cover 111 via a spring washer 110. A terminal 112 formed by extending a part of the metal cover 111 is electrically connected to the external conductor 105b on the side surface of the ceramic sintered body 103. A through hole 113 is provided in the metal cover 111, and a driver is inserted into the driver groove 114 formed in the rotor 107 through the through hole 113.

In the trimmer capacitor 100, a capacitance is formed between the inner conductor 104 and the terminal electrode 108, and the capacitance is changed by rotating the rotor 107 with a driver.

[0030] When the trimmer capacitor 100 is manufactured, the lower force is also placed in the order of the metal cover 111, the spring washer 110, the rotor 107, and the stator 101, and the external electrode 105a and the terminal 112 are soldered. At this time, if the stator 101 is upside down, a desired capacity cannot be formed. Therefore, the stator 101 is placed with the other main surface that can identify the black ceramic layer 106 facing upward.

Note that according to the present embodiment, the ceramic layer 102 may be composed of a force resistor that exemplifies a dielectric ceramic as a material constituting the ceramic layer 102 or a semiconductor ceramic. . In this case, the structure shown in FIG. 1 alone can function as a chip resistor or chip thermistor. At this time, the black ceramic layer 106 functions as a marker for identifying the upper and lower sides when the board is mounted. Further, when the ceramic layer 102 is formed of a resistor, it can function as a variable resistor if the structure shown in FIG. 2 is adopted.

[0032] (Embodiment 2)

FIG. 3 is a schematic cross-sectional view and a schematic bottom view showing a stator constituting a part of the trimmer capacitor in the present embodiment. As shown in FIG. 3, the stator 201 is disposed between the ceramic sintered body 203 in which a plurality of ceramic layers 202 are laminated and the ceramic layer 202, and is drawn out to a side surface of the ceramic sintered body 203. Black ceramics disposed between the ceramic layer 202 and the outer conductors 205a and 205b formed on the side surfaces of the inner conductors 204a and 204b and the ceramic sintered body 203 and electrically connected to the inner conductors 204a and 204b, respectively. And layer 2 06.

[0033] The stator in the present embodiment differs from that in the first embodiment in the arrangement of the internal electrodes and the black ceramic layer. Other configurations are the same as those of the first embodiment, and the description thereof is omitted.

FIG. 4 is a schematic cross-sectional view showing a trimmer capacitor using the stator 201 shown in FIG. As shown in FIG. 4, in the trimmer capacitor 200, a metal rotor 207 is disposed on the upper portion of the stator 201, and the terminal electrode 208 and the protrusion 209 formed on the lower portion of the rotor 207 are connected to one main surface of the ceramic sintered body 203. It touches. The rotor 207 is covered with a metal cover 211 via a spring washer 210. A through hole 213 is provided in the metal cover 211, and a driver is inserted into the driver groove 214 formed in the rotor 207 through the through hole 213.

In trimmer capacitor 200, a capacitance is formed between inner conductors 204a and 204b and terminal electrode 208, and the capacitance is changed by rotating rotor 207 with a screwdriver. The trimmer capacitor in the present embodiment differs from that in the first embodiment in the arrangement of internal electrodes, the arrangement of the black ceramic layer, the structure of the rotor, the structure of the metal cover, and the location where the capacitance is formed. Other configurations are the same as those of the first embodiment, and the description thereof is omitted.

[0037] Note that, according to the present embodiment, the ceramic layer 202 may be made of a force resistor that exemplifies a dielectric ceramic as a material constituting the ceramic layer 202, or a semiconductor ceramic. . In this case, the structure shown in FIG. 3 alone can function as a chip resistor or chip thermistor. At this time, the black ceramic layer 206 functions as a marker for identifying the upper and lower sides when the board is mounted. Further, when the ceramic layer 202 is formed of a resistor, it can function as a variable resistor if the structure shown in FIG. 3 is adopted.

Experimental example 1

[0038] In this experimental example, the influence of the composition of the black ceramic layer was verified.

[0039] First, as a ceramic powder, CaO-La O-TiO-Nd O-based ceramic powder (fired)

2 3 2 2 3

After that, a green color) was prepared. Next, the ceramic powder is mixed with a solvent (ethyl acetate) and an organic binder (acrylic resin) to produce a ceramic slurry, which is then formed into a sheet shape by a doctor blade, and a ceramic green sheet having a thickness of 20 m. Was made.

[0040] Next, Pd powder as a metal powder, a tervineol as a solvent, and ethylcellulose as an organic binder were prepared, and these were mixed to prepare an internal conductor paste.

[0041] Next, MnCO, Fe 2 O, and the organic vehicle are weighed so as to have the composition shown in Table 1 below.

3 2 3

The ceramic paste for the black ceramic layer was prepared. Α-Tabineol was used as the solvent contained in the organic vehicle, and ethicellulose was used as the organic binder.

[0042] Next, an internal conductor paste or a black ceramic layer paste was printed on a predetermined ceramic green sheet, and a plurality of ceramic green sheets were laminated to produce an unfired ceramic laminate.

Next, the unfired ceramic laminate was fired in an air atmosphere and a firing temperature of 1240 ° C. (kept for 2 hours) to prepare ceramic sintered body samples 1 to 11 shown in Table 1 below.

[0044] [Table 1] Sample MnC0 ₃ Fe ₂ 0 ₃

MnC0 ₃ : Fe ₂ 0 ₃ organic vehicle

Coloring penetrability warping

Number (heavy scenery ¾) [wt%] (wt%)

* 1 40 0 1: 0 60 ○ X X

* 2 30 10 3: 1 60 ○ X X

* 3 26.7 13.3 2: 1 60 〇 X X

4 24 16 3 ： 2 60 ○ ○ ○

5 20 20 1: 1 60 O ○ ○

6 35 35 1: 1 30 ○ ○ ○

7 15 15 1: 1 70 ○ ○ O

8 16 24 2: 3 60 o ○ ○

9 13.3 26.7 1: 2 60 ○ ○ ○

10 10 30 1: 3 60 ○ O ○

* 11 0 40 0: 1 60 ○ X ○

* Mark is outside the scope of claims of the present invention

FIG. 5 is a schematic cross-sectional view showing a ceramic sintered body in this experimental example. As shown in FIG. 5, the ceramic sintered body 303 includes an inner conductor 304 and a black ceramic layer 306 inside. In FIG. 5, the ceramic layers are not shown one by one for convenience.

[0046] The size of each sample of the ceramic sintered body was 4.9 mm X 4.8 mm X 1.2 mm. In each sample, the black ceramic layer was arranged at a position of 0.02 mm from the upper surface of the ceramic sintered body.

[0047] Next, color development, permeability and warpage were evaluated for each sample. The results are shown in Table 1.

[0048] Regarding color development, the case where the black ceramic layer could be identified visually from the bottom surface (one main surface) of the ceramic sintered body was evaluated as ◯, and the case where the black ceramic layer could not be identified was evaluated as X.

[0049] With respect to the permeability, the case where the black ceramic layer could not be visually identified from the upper surface (the other main surface) of the ceramic sintered body was evaluated as "O", and the case where the ceramic layer could be identified was evaluated as "X".

[0050] Regarding warpage, the difference in height between the side surface and the center of the ceramic sintered body was evaluated as ◯, and when the difference in height was 0.5 mm or more was evaluated as X.

[0051] As shown in Table 1, Samples 4 to 10 gave good results in any of color development, permeability, and warpage. On the other hand, for samples 1 to 3, the Mn component is excessively added. Because of being carotened, the evaluation of permeability and warpage was bad. In addition, for Sample 11, since the Fe component was excessively added, black color development was too strong. Therefore, the evaluation of permeability was bad.

Example 2

[0052] In this experimental example, the influence of the formation position of the black ceramic layer was verified.

[0053] First, as a ceramic powder, CaO—La O—TiO—Nd O-based ceramic powder (fired)

2 3 2 2 3

And then green) and BaO-TiO -La O — Nd O ceramic powder (after firing, brown)

2 2 3 2 3

Present). Using these ceramic powders, two types of ceramic green sheets with a thickness of 20 μm were prepared in the same manner as in Experimental Example 1.

Next, a ceramic paste for a black ceramic layer having the same composition as Sample 5 prepared in Experimental Example 1 was prepared, and this ceramic paste was printed on two types of ceramic green sheets, respectively. The coating thickness of the ceramic paste was

[0055] In this experimental example, a plurality of unfired ceramic laminates were produced by changing the lamination position of the ceramic Darin sheet printed with the ceramic paste for the black ceramic layer. FIG. 6 is a schematic sectional view showing the unfired ceramic laminate used in this experimental example. As shown in FIG. 6, the unfired ceramic laminate 403 includes a ceramic paste 406 for the black ceramic layer inside, but the internal conductor is not formed because it has nothing to do with this experiment. In FIG. 6, the ceramic green sheets are not shown one by one for convenience.

[0056] As shown in FIG. 6, in the thickness direction of the unfired ceramic laminate 403, the upper surface 403a force is also the distance to the black ceramic layer ceramic paste 406, X (m), and the black ceramic layer ceramic paste 406 The distance from the bottom to 403b is Y (m). The thickness of the unsintered ceramic laminate 403 was 1.2 mm.

[0057] In FIG. 6, for the sake of convenience, the distance to the middle point in the thickness direction of the ceramic paste 406 for the black ceramic layer is illustrated, but in practice, up to the portion where the black ceramic layer ceramic paste 406 is formed. The distance X was determined by counting the number of ceramic green sheets and multiplying the thickness (50 m) of the ceramic green sheets. Also, Y is the distance obtained by subtracting X from the total thickness of 1200 m.

[0058] Then, as shown in Table 2 below, the ceramic green sheets were laminated while changing the distance X. Thus, a plurality of unfired ceramic laminates were produced. When producing an unfired ceramic laminate, the same type of ceramic green sheets were laminated. These unfired ceramic laminates were fired under the same conditions as in Experimental Example 1 to produce ceramic sintered body samples 21 to 46 shown in Table 2.

[0059] [Table 2]

* Mark is outside the scope of claims of the present invention

[0060] In Table 2, the ceramic sintered body A is a CaO-LaO-TiO-NdO-based ceramic powder.

2 3 2 2 3

It is the green ceramic sintered compact produced using the powder. Further, the ceramic sintered body B is, B AO- Ti_〇 ₂ - Nd 0 ₃ based ceramic sintered body brown produced using the ceramic powder - La ₂ 〇 _3.

[0061] Next, each sample was evaluated for display identifiability and front / back identifiability. The results are shown in Table 2. [0062] Regarding the display identifiability, ◯ indicates that the black mark can be clearly identified from at least one of the upper surface side or the bottom surface side of the ceramic sintered body, X indicates that the unidentifiable force is X, If it was not clear! / ヽ was identified as △.

[0063] For the possibility of discriminating between the front and back sides, it is better to look from either the top side or the bottom side of the ceramic sintered body and from the main surface side close to the side on which the black ceramic layer is formed. The darker and clearer black marks could be identified as ◯, those that could not be identified as X, and those that were not clear but generally identified as △.

[0064] As shown in Table 2, sample No. 30 has a black ceramic layer formed at the midpoint of the thickness of the ceramic sintered body. Therefore, which is the darker force, that is, which is the front I couldn't discern what it was. In sample No. 42, a black ceramic layer is formed at the midpoint of the thickness of the ceramic sintered body, and the distance from the main surface to the black ceramic layer is longer than that in sample No. 30. The power was unidentifiable.

[0065] Sample numbers 21, 29, 31, and sample numbers 33, 41, and 43 are all subject data of the present invention, and the black dot mark can be identified as well as the front and back sides. The position of the formation was more clearly identified as the midpoint force was further away.

[0066] In the above-described embodiment, the inner conductor is disposed so as not to overlap the black ceramic layer in the stacking direction of the ceramic layers. However, the black ceramic layer unintentionally extends and expands in the direction perpendicular to the stacking direction, for example, depending on the pressure applied after the green sheets are laminated, or depending on the viscosity of the green sheets. There may be some overlap with the inner conductor. Even in such a case, the structural defect does not become apparent when it becomes a ceramic sintered body, and as long as there is a strong overlap between the inner conductor and the black ceramic layer, the effect of the present invention is impaired. However, it is within the scope of the present invention.

Claims

The scope of the claims

[1] A ceramic sintered body formed by laminating a plurality of ceramic layers containing La oxide and Ti oxide, and having one main surface, the other main surface, and side surfaces;

An inner conductor disposed between the ceramic layers and drawn out to a side surface of the ceramic sintered body;

An outer conductor formed on a side surface of the ceramic sintered body and electrically connected to the inner conductor;

With

Mn oxide and Fe oxide are respectively converted into MnCO between the ceramic layers and on one main surface side of the ceramic sintered body from the midpoint of the thickness of the ceramic sintered body.

3 The black ceramic layer is placed so that the weight ratio is 3: 2 to 1: 3 in terms of FeO.

twenty three

And

The ceramic electronic component, wherein the inner conductor and the black ceramic layer are arranged so as not to substantially overlap in the stacking direction of the ceramic layers.

[2] The ceramic electronic part according to [1], wherein the inner conductor is arranged on the other main surface side of the ceramic sintered body from a middle point of the thickness of the ceramic sintered body.

P

PPo

[3] A terminal electrode is provided outside the ceramic sintered body so as to be in contact with the other main surface of the ceramic sintered body and opposed to the internal conductor. The ceramic electronic component according to claim 1 or 2.

4. The ceramic electronic component according to claim 3, wherein the terminal electrode is slidably in contact with the other main surface of the ceramic sintered body.

5. The ceramic electronic component according to claim 3, wherein the ceramic layer has a dielectric force, and a capacitance is formed between the inner conductor and the terminal electrode.