JP2003068568A - Laminated ceramic capacitor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a laminated ceramic capacitor for which many capacitor elements are constituted in a laminated body in high density. SOLUTION: For the laminated ceramic capacitor, internal electrodes 2, 3 and 4 and ground electrodes 5, 6 and 7 are alternately laminated through a dielectric layer 8 and turned to the laminated body, external electrodes connected to the internal electrodes and external ground electrodes connected to the ground electrodes are alternately formed respectively on both surfaces of the laminated body, the capacitor elements are constituted between the adjacent ground electrode and external electrode on both surfaces of the laminated body, and the capacitor elements are constituted between the external ground electrode and the external electrode facing each other on both surfaces of the laminated body.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laminated body in which internal electrodes and ground electrodes are alternately laminated via dielectric layers, and the laminated body is connected to the external electrodes and the ground electrodes. The present invention relates to a laminated ceramic capacitor including the external ground electrode.

[0002]

2. Description of the Related Art The structure of a laminated ceramic capacitor as a general laminated electronic component will be described below.

FIG. 7 is an exploded perspective view of the monolithic ceramic capacitor, FIG. 8 is an external perspective view of the monolithic ceramic capacitor, and FIG. 9 is an electric circuit diagram of the monolithic ceramic capacitor.

In FIGS. 7, 8 and 9, reference numeral 101 denotes a monolithic ceramic capacitor. The monolithic ceramic capacitor 101 has internal electrodes 103 to 108 and ground electrodes 109 to 114 via a dielectric layer 102 made of a dielectric material. Are alternately laminated, and ineffective layers 115 and 116 are provided at the top and bottom.
To form a laminated body 117, and the extended portions 118 to 12 of the internal electrodes 103 to 108 are formed on the surface of the laminated body 117.
3 and external ground electrodes 136-141 connected to the extension parts 130-135 of the ground electrodes 109-114, and opposed to the external electrodes 124-129 of the laminate 117. External ground electrode 13
6 to 141 and capacitors C101 to C1 respectively.
It is composed of 06.

A method of manufacturing the monolithic ceramic capacitor 101 having the above structure will be described below.

First, a ceramic slurry containing barium titanate as a main component is applied on a carrier film by a known doctor blade method and then dried to obtain the dielectric layer 10.
2 and a ceramic green sheet (not shown) to be the ineffective layers 115 and 116 are prepared.

Next, among the ceramic green sheets,
A predetermined number of ceramic green sheets to be the ineffective layer 116 are pressed and repeatedly pressed, and a conductive paste made of palladium or nickel is printed on the upper surface of the upper stage by a screen printing method or the like and dried to form the internal electrodes 103. Further, the ceramic green sheet to be the dielectric layer 102 is pressure-bonded thereon, a conductive paste made of palladium or nickel is printed on the upper surface, and dried to form the ground electrode 109. After that, the internal electrodes 1 are sequentially inserted through a ceramic green sheet that becomes the dielectric layer 102.
04 and the ground electrode 110, the internal electrode 105 and the ground electrode 111, the internal electrode 106 and the ground electrode 1
12, the internal electrode 107 and the ground electrode 113, the internal electrode 108 and the ground electrode 114 are formed and pressure-bonded, and a predetermined number of ceramic green sheets to be the ineffective layer 115 are stacked on the uppermost layer and pressure-bonded. A block of the laminated body 117 is produced, and the block of the laminated body 117 is cut into a predetermined size to obtain the laminated ceramic capacitor 101.
Make a green chip.

Next, after degreasing and firing the green chip to obtain a sintered body, the extension portions 118 to 12 of the plurality of internal electrodes 103 to 108 exposed on the surface of the laminated body 117.
3 and extension parts 130-1 of the ground electrodes 109-114
35 is coated with a conductive paste so as to cover 35 and baked, and the external electrodes 124 to 129 and the external ground electrodes 136 to 14
1 to form a monolithic ceramic capacitor 101 having the same number of capacitor elements C101 to C106 as the pair of the external electrodes 124 to 129 and the external ground electrodes 136 to 141.

[0009]

However, according to the structure of the conventional monolithic ceramic capacitor 101,
The internal electrodes 103 to 108 and the ground electrodes 109 to 114
And only the number of capacitor elements C101 to C106 that are overlapped with each other via the dielectric layer 102 can be obtained, and in order to configure a large number of capacitor elements with one laminated body 117, the number of laminated internal electrodes and ground electrodes is Since it is necessary to increase the number of external electrodes and external ground electrodes formed on both surfaces of the laminated body, productivity may be impaired, and the outer shape of the laminated body may become large, making it difficult to perform high-density mounting. there were.

The present invention solves the above-mentioned problems of the prior art by constructing a combination of a large number of capacitor elements without increasing the number of external electrodes and external ground electrodes formed on the surface of the laminated body, which is suitable for electronic equipment. An object is to provide a monolithic ceramic capacitor that can be mounted at high density.

[0011]

In order to achieve the above object, the laminated ceramic capacitor of the present invention has the following constitution.

According to the first aspect of the present invention, the internal electrodes and the ground electrodes are alternately laminated via the dielectric layers to form a laminated body, and the internal electrodes are connected to both surfaces of the laminated body. External electrodes and external ground electrodes connected to the ground electrodes are alternately formed to form a capacitor element between the external ground electrodes and the external electrodes that are adjacent to each other on both sides of the laminated body and face both sides of the laminated body. A multilayer ceramic capacitor in which a capacitor element is formed between the external ground electrode and the external electrode, whereby a first capacitor element is formed between the external electrode and the external ground electrode facing each other on both surfaces of the multilayer body. Since a capacitor element can be formed between the external electrode and the external ground electrode, which are arranged side by side on both sides of the laminated body, a large number of capacitors can be formed by a pair of the internal electrode and the ground electrode. Can configure the child, effect that it is possible to obtain an excellent multilayer ceramic capacitor of value added which can be mounted densely on the electronic equipment, the effect can be obtained.

According to a second aspect of the present invention, a plurality of extension portions exposed on both sides of the laminated body are arranged in parallel to the ground electrode, and a pair of extension portions exposed on both sides of the laminated body are formed on the internal electrode. Then, every time the internal electrode and the ground electrode are laminated via the dielectric layer, the extension portion of the internal electrode is sequentially shifted and laminated in the juxtaposed direction of the ground electrode, and the extension portion of the ground electrode and the internal portion are laminated. The multilayer ceramic capacitor according to claim 1, wherein extension parts of the electrodes are alternately arranged, and a plurality of external electrodes connected to the internal electrodes and external ground electrodes connected to the ground electrodes are alternately formed on both surfaces of the multilayer body. As a result, each of the external ground electrodes alternately arranged with the external electrodes is electrically short-circuited and the potentials become equal, so that the electrical grounding effect is good, and the external ground electrodes are formed between the adjacent external electrodes. Since there are multiple external power Can prevent crosstalk between, effect that it is possible to obtain an excellent multilayer ceramic capacitor of the electrical properties is possible configure multiple capacitor elements in a pair of overlap between the internal electrode and the ground electrode, the effect can be obtained.

The invention according to claim 3 of the present invention is the monolithic ceramic capacitor according to claim 1 in which the internal electrodes are separated by a pair of internal electrodes between opposite surfaces of the laminate. As a result, since the external electrodes facing each other on both sides of the laminated body are independently configured without short-circuiting, it is possible to configure a larger number of capacitor elements at high density and obtain a laminated ceramic capacitor having excellent electrical characteristics. Action and effect can be obtained.

The invention according to claim 4 of the present invention is the monolithic ceramic capacitor according to claim 3, wherein the areas of the pair of internal electrodes are different from each other, whereby the capacitance on both surfaces of the laminate is increased. Since different capacitor elements can be configured, a large number of various capacitor elements can be configured at high density,
The action and effect of obtaining a monolithic ceramic capacitor having an excellent added value can be obtained.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION (Embodiment 1) In the following, the invention described in claims 1 and 2 of the present invention will be described with reference to Embodiment 1.

FIG. 1 is an exploded perspective view of a monolithic ceramic capacitor according to Embodiment 1 of the present invention, FIG. 2 is an external perspective view of the monolithic ceramic capacitor, and FIG. 3 is an electric circuit diagram of the monolithic ceramic capacitor.

1 to 3, reference numeral 1 denotes a monolithic ceramic capacitor, and the monolithic ceramic capacitor 1 has internal electrodes 2, 3, 4 and ground electrodes 5, 6, 7 as a dielectric layer 8.
And the external electrodes 12 connected to the internal electrodes 2, 3 and 4 respectively on both surfaces of the laminated body 11 by stacking a plurality of ineffective layers 9 and 10 on the upper and lower layers alternately. ˜17 and external ground electrodes 18 to 23 connected to the ground electrodes 5, 6 and 7 are alternately formed.

The laminated body 11 is formed on the ground electrodes 5, 6 and 7.
A plurality of extension parts 24 to 29 exposed on both surfaces of the laminate 11 are arranged side by side, and a pair of extension parts 30 and 31, 32, 33, 34 and 35 exposed on both surfaces of the laminated body 11 on the internal electrodes 2, 3 and 4. And the internal electrodes 2, 3, 4 and the ground electrodes 5, 6,
7 and the extension portions 30 and 31, 32 and 33, 34 and 35 of the internal electrodes 2, 3 and 4 each time the dielectric layer 8 is laminated via the extension portions of the ground electrodes 5, 6 and 7. 24 to 29 are sequentially staggered in the juxtaposed direction to be laminated, and the ground electrodes 5, 6,
7 extending portions 24 to 29 and the extending portions 30 and 31, 32 and 33, 34 and 35 of the internal electrodes 2, 3 and 4 are alternately arranged, and the internal electrodes 2 to 4 are provided on both surfaces of the laminated body 11. A plurality of external electrodes 12 to 17 connected to and external ground electrodes 18 to 23 connected to the ground electrodes 5 to 7 are alternately formed.

A method of manufacturing the monolithic ceramic capacitor 1 having the above structure will be described below.

First, a ceramic slurry containing barium titanate as a main component is applied on a carrier film by a known doctor blade method and then dried to form a ceramic green sheet for forming the dielectric layer 8 and the ineffective layers 9 and 10 (see FIG. And (not shown).

Next, among the ceramic green sheets,
A predetermined number of ceramic green sheets to be the ineffective layer 10 are pressed and repeatedly pressed, and a conductive paste made of palladium or nickel is printed on the upper layer and dried to form the internal electrodes 2, and a dielectric substance is further formed thereon. The ceramic green sheet to be the layer 8 is pressure-bonded, a conductive paste made of palladium or nickel is printed on the upper surface, and dried to form the ground electrode 5. At this time, the ground electrode 5 has a plurality of extension parts 2 extending to both ends of the dielectric layer 8 and forming a pair.
4 and 25, 26 and 27, 28 and 29 are formed, and a pair of extension portions 30 and 31 are formed in the internal electrode 2. Then, each time the layers are laminated with the dielectric layer 8 interposed therebetween, the extension portions 30 and 31, 32 and 33, 34 and 3 of the internal electrodes 2, 3 and 4 are laminated.
5 and 5 are sequentially shifted in the direction in which the extension portions 24 to 29 of the ground electrodes 5, 6 and 7 are arranged in parallel, and are stacked to form the ground electrodes 5, 6, 7
24 to 29 and the extension parts 30 and 31, 32 and 33, 34 and 35 of the internal electrodes 2, 3 and 4 are alternately arranged and crimped to form the ineffective layer 9 at the uppermost stage. A predetermined number of sheets are stacked and pressure-bonded to produce a block of the laminated body 11, and the block of the laminated body 11 is cut into a predetermined size to produce a green chip of the laminated ceramic capacitor 1.

Next, after degreasing and firing the green chip into a sintered body, the extension portions 30 to 35 of the plurality of internal electrodes 2 to 4 exposed on the surface of the laminated body 11 and the ground electrode 5 are exposed. 7. A conductive paste is applied so as to cover the extended portions 24 to 29 of 7 and baked to form the external electrodes 12 to 17 and the external ground electrodes 18 to 23, thus completing the monolithic ceramic capacitor 1.

With the above structure, in the monolithic ceramic capacitor 1, the external electrodes 12, 13 and the external ground electrode 18,
Capacitor element C1 is respectively formed between 19, 20, 21, 22, and 23, and capacitor element C2 is respectively formed between the external electrodes 14, 15 and the external ground electrodes 18, 19, 20, 21, 22, 23. And external electrodes 16 and 17
And external ground electrodes 18, 19, 20, 21, 22, and 23, respectively, to form a capacitor element C3, and the internal electrode and the ground electrode overlap with each other in three pairs.
The capacitor elements of C3 are external ground electrodes 18-2, respectively.
Since it can be obtained by each combination with 3, a large number of capacitor elements can be configured even if the number of overlapping internal electrodes and ground electrodes is small.

(Second Embodiment) The second embodiment of the present invention will be described below. Since the monolithic ceramic capacitor according to the second embodiment has basically the same configuration as that of the monolithic ceramic capacitor according to the first embodiment, common components are designated by the same reference numerals and detailed description thereof will be omitted.

FIG. 4 is an exploded perspective view of the monolithic ceramic capacitor according to the second embodiment of the present invention, FIG. 5 is an external perspective view of the monolithic ceramic capacitor, and FIG. 6 is an electric circuit diagram of the monolithic ceramic capacitor.

In FIGS. 4 to 6, reference numeral 41 denotes a monolithic ceramic capacitor.
1 is a pair of internal electrodes 42, 43 separated by forming a gap
And the ground electrode 54, the internal electrodes 44, 45 and the ground electrode 55,
The internal electrodes 46, 47 and the ground electrode 56 are alternately laminated with the dielectric layer 8 interposed therebetween, and a plurality of ineffective layers 9, 10 are laminated on the upper and lower layers to form a laminated body 74. An external electrode 63 connected to the internal electrodes 42 to 47
To 68 and external ground electrodes 69 to 74 connected to the ground electrodes 57 to 62 are alternately formed so as to face opposite surfaces of the laminate 74.

The ground electrodes 54, 55 and 56 are provided with extension portions 57, 59 and 61 extending toward one end of the dielectric layer 8 and extension portions 58, 60 and 62 extending toward the other end of the dielectric layer 8. Then, extending portions 48, 50, 52 are formed on the internal electrodes 42, 44, 46 toward one end of the dielectric layer 8, and the internal electrodes 43, 45, 47 are extended toward the other end of the dielectric layer 8. The extension parts 49, 51 and 53 are formed, and the internal electrode 4 is formed.
2, 44, 46 extended portions 48 to 52 and the external electrode 63
To 68, the extension portions 57 to 62 of the ground electrodes 54, 55, 56 and the external ground electrodes 69 to 74 are connected. At this time, the internal electrodes 42, 4
The areas of 4, 46 are formed to be half the area of the internal electrodes 43, 45, 47.

With the above structure, in the multilayer ceramic capacitor 41, the external electrode 63 and the external ground electrode 6 are provided.
9 to 74, a capacitor element C21 is formed between the external electrode 64 and the external ground electrodes 69 to 74, and a capacitor element C22 is formed between the external electrode 64 and the external ground electrodes 69 to 74. 74 to form a capacitor element C23 between them and the internal electrode 66.
And a capacitor element C24 between the external ground electrodes 69 to 74 and a capacitor element C between the external electrode 67 and the external ground electrodes 69 to 74, respectively.
25, and includes the external electrode 68 and the external ground electrode 6
Capacitor element C26 is formed between each of them and 9 to 74.

With the above structure, although the internal electrode and the ground electrode overlap with each other in three pairs, the C21, C22, C23, C
Since 24, C25, and C26 capacitor elements are obtained by respectively combining with the external ground electrodes 69 to 74, a large number of capacitor elements can be configured even if the number of overlapping internal electrodes and ground electrodes is small, and external The capacitor element connected to the electrodes 63, 65 and 67 has a capacitance that is half that of the capacitor element connected to the external electrodes 64, 66 and 67, and can have two types of capacitance values. As a result, a monolithic ceramic capacitor with high added value has been obtained.

If the areas of the internal electrodes 42 to 48 are formed to be different from each other, various capacitor elements having different electrostatic capacities can be formed in one laminated body, and each of the plurality of capacitor elements is formed. Capacitor elements having different temperature characteristics can be formed by changing the materials of the dielectric layers.

[0032]

INDUSTRIAL APPLICABILITY As described above, according to the present invention, the first capacitor element can be formed between the external electrode and the external ground electrode facing each other on both sides of the laminated body, and the external electrodes arranged side by side on both sides of the laminated body. Since a capacitor element can be formed between the external electrode and the external ground electrode, a large number of capacitor elements can be densely formed by a pair of the internal electrode and the ground electrode, and a multilayer ceramic capacitor with excellent added value can be obtained. it can.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a monolithic ceramic capacitor according to a first embodiment of the present invention.

FIG. 2 is an external perspective view of the monolithic ceramic capacitor according to the first embodiment.

FIG. 3 is an electric circuit diagram of the monolithic ceramic capacitor according to the first embodiment.

FIG. 4 is an exploded perspective view of a monolithic ceramic capacitor according to a second embodiment of the present invention.

FIG. 5 is an external perspective view of the monolithic ceramic capacitor according to the second embodiment.

FIG. 6 is an electric circuit diagram of the monolithic ceramic capacitor according to the second embodiment.

FIG. 7 is an exploded perspective view of a conventional monolithic ceramic capacitor.

FIG. 8 is an external perspective view of the multilayer ceramic capacitor.

FIG. 9 is an electric circuit diagram of the multilayer ceramic capacitor.

[Explanation of symbols]

1,41 Multilayer ceramic capacitors 2, 3, 4, 42-47 Internal electrodes 5,6,7,54,55,56 Ground electrode 8 Dielectric layer 9,10 Invalid layer 11 laminate 12-17 External electrode 18-23 External ground electrode 24-35, 48-53, 57-62 Extension

Claims (4)

[Claims] 1. An internal electrode and a ground electrode are alternately laminated through a dielectric layer to form a laminated body, and an external electrode connected to the internal electrode and the ground electrode are connected to both surfaces of the laminated body. External ground electrodes are alternately formed to form a capacitor element between the external electrodes and the external ground electrodes that are adjacent to each other on both sides of the laminated body, and the external electrodes and the outside that are opposed to both sides of the laminated body. A monolithic ceramic capacitor that has a capacitor element between it and the ground electrode. 2. A ground electrode is provided with a plurality of extension portions that are exposed on both sides of the laminate, and a pair of extension portions that are exposed on both sides of the laminate are formed on the internal electrode. The internal electrode and the ground electrode are connected to each other. Every time the layers are laminated via the dielectric layer, the extension parts of the internal electrodes are sequentially shifted in the juxtaposed direction of the ground electrodes, and the extension parts of the ground electrodes and the extension parts of the internal electrodes are alternately arranged to form a laminate. The multilayer ceramic capacitor according to claim 1, wherein a plurality of external electrodes connected to the internal electrodes and external ground electrodes connected to the ground electrodes are alternately formed on both surfaces of the multilayer ceramic capacitor. 3. The monolithic ceramic capacitor according to claim 1, wherein the internal electrode is formed between a pair of internal electrodes separated from each other on opposite sides of the laminated body. 4. The monolithic ceramic capacitor according to claim 3, wherein the areas of the pair of internal electrodes are different from each other.