KR102584968B1 - Capacitor component - Google Patents

Abstract

One embodiment of the present invention includes a body including first and second internal electrodes alternately disposed with a dielectric layer therebetween; a pair of first connection electrodes that penetrate the body in the thickness direction, are connected to the first internal electrode, and are spaced apart from each other by V1 in the width direction of the body; a pair of second connection electrodes that penetrate the body in the thickness direction, are connected to the second internal electrode, and are spaced apart from each other by V2 in the width direction of the body; and first and second external electrodes disposed on the body and connected to the first and second connection electrodes, respectively, wherein when the width direction length of the first and second internal electrodes is defined as W, V1 /W and V2/W are available for capacitor components that are greater than 0.7.

Description

Capacitor component {CAPACITOR COMPONENT}

The present invention relates to capacitor components.

Multilayer ceramic capacitors, one of the capacitor components, are used as printed circuit boards for various electronic products such as video devices such as liquid crystal displays (LCDs) and plasma display panels (PDPs), computers, smartphones, and mobile phones. It is a chip-type condenser that is mounted on and plays the role of charging or discharging electricity. These multi-layered ceramic capacitors (MLCC) can be used as components in various electronic devices due to their small size, high capacity, and easy mounting.

These MLCCs can be used as components in various electronic devices due to their advantages of being small, having guaranteed capacity, and being easy to mount, and development has recently progressed in the direction of high capacity and high reliability.

Recently, as electronic products have become smaller and thinner, passive components are also required to be smaller and thinner. In response to these needs, the development of a multilayer ceramic capacitor is in progress, which forms a via or through hole, fills it with a conductive material to form a via electrode connected to the internal electrode, and forms a bottom electrode for connection to the via electrode.

One purpose of the present invention is to provide a capacitor component with low equivalent series inductance (hereinafter referred to as 'ESL').

As a method for solving the above-described problem, the present invention seeks to propose a capacitor component of a novel structure through an example, and specifically, a body including first and second internal electrodes alternately disposed with a dielectric layer interposed therebetween. ; a pair of first connection electrodes that penetrate the body in the thickness direction, are connected to the first internal electrode, and are spaced apart from each other by V1 in the width direction of the body; a pair of second connection electrodes that penetrate the body in the thickness direction, are connected to the second internal electrode, and are spaced apart from each other by V2 in the width direction of the body; and first and second external electrodes disposed on the body and connected to the first and second connection electrodes, respectively, wherein when the width direction length of the first and second internal electrodes is defined as W, V1 /W and V2/W are 0.7 or more.

According to one embodiment of the present invention, it is possible to provide a capacitor component with a low equivalent series inductance (ESL) by controlling the arrangement of the connection electrodes. Additionally, the capacity and reliability of capacitor components can be improved.

Figure 1 schematically shows a perspective view of a capacitor component according to an embodiment of the present invention.
FIG. 2 schematically shows a cross-sectional view along the thickness and length direction of the capacitor component of FIG. 1.
FIG. 3 schematically shows a cross-sectional view of the capacitor component of FIG. 1 along the width and length directions.
Figure 4 schematically shows a cross-sectional view in the width and length directions of a capacitor component according to another embodiment of the present invention.
Figure 5 is an enlarged view of B in Figure 4.
Figure 6 schematically shows a circuit board on which capacitor components are mounted according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described with reference to specific embodiments and attached drawings. However, the embodiments of the present invention may be modified into various other forms, and the scope of the present invention is not limited to the embodiments described below. Additionally, embodiments of the present invention are provided to more completely explain the present invention to those skilled in the art. Accordingly, the shapes and sizes of elements in the drawings may be exaggerated for clearer explanation. In addition, components having the same function within the scope of the same idea shown in the drawings of each embodiment will be described using the same reference numerals.

In order to clearly explain the present invention in the drawings, parts that are not relevant to the description are omitted, and the thickness is enlarged to clearly express various layers and regions. Components with the same function within the scope of the same idea are referred to by the same reference. Explain using symbols. Furthermore, throughout the specification, when a part is said to “include” a certain element, this means that it may further include other elements rather than excluding other elements, unless specifically stated to the contrary.

In the drawings, the

Figure 1 schematically shows a perspective view of a capacitor component according to an embodiment of the present invention. FIG. 2 schematically shows a cross-sectional view along the thickness and length direction of the capacitor component of FIG. 1. FIG. 3 schematically shows a cross-sectional view in the width and length directions of the capacitor component of FIG. 1.

1 to 3, the structure of the capacitor component 10 according to an embodiment of the present invention will be described.

The capacitor component 10 according to an embodiment of the present invention includes a body 110 and first and second external electrodes 141 and 142 disposed outside the body.

The body 110 is formed by stacking a plurality of dielectric layers 111 and can be obtained by stacking a plurality of green sheets and then sintering them. Through this sintering process, the plurality of dielectric layers 111 may have an integrated form. The shape and dimensions of the body 110 and the number of stacks of the dielectric layers 111 are not limited to those shown in this embodiment. For example, as shown in FIG. 1, the body 110 may have a rectangular parallelepiped shape. You can.

The dielectric layer 111 included in the body 110 may include a ceramic material having a high dielectric constant, for example, a barium titanate (BaTiO ₃ )-based or strontium titanate (SrTiO ₃ )-based material, but may contain a sufficient dielectric constant. Other materials known in the art may also be used as long as the capacitance can be achieved. The _{BaTiO 3 -based ceramic} powder is _, for example _, (Ba _{1 -x} Ca (Ba _1-x Ca _x )(Ti _1-y Zr _y )O ₃ or Ba(Ti _1-y Zr _y )O ₃ . The dielectric layer 111 may further include additives, organic solvents, plasticizers, binders, and dispersants, if necessary, along with the ceramic material as the main component. Among these, the same materials as those added to the internal electrodes 121 and 122 may be used as the additives. may be included, and the concentration of these additives is appropriately adjusted locally to ensure uniform sintering characteristics.

Cover layers 112 formed by stacking dielectric layers that do not include internal electrodes may be disposed on the upper and lower portions of the body 110.

The inside of the body 110 includes first and second internal electrodes 121 and 122 arranged to face each other with the dielectric layer 111 therebetween. The first and second internal electrodes 121 and 122 are connected to different external electrodes 141 and 142 and may have different polarities when driven. The first and second internal electrodes 121 and 122 can be obtained by printing a paste containing a conductive metal to a predetermined thickness on one side of a ceramic green sheet and then sintering the paste. The main constituent materials of the first and second internal electrodes 121 and 122 include nickel (Ni), copper (Cu), palladium (Pd), and silver (Ag), and alloys thereof can also be used. There will be.

At this time, the first and second internal electrodes 121 and 122 may include first and second insulating portions 121a and 122a, respectively. The first and second insulating portions 121a and 122a refer to areas in which the first and second internal electrodes 121 and 122 are not formed, respectively, and the first and second internal electrodes 121 and 122 are formed in different regions, respectively. It can play a role in allowing connection only to external electrodes of polarity. That is, the first connection electrode 131 is spaced apart from the second internal electrode 122 by the second insulating part 122a, and the second connection electrode 132 is spaced apart from the first internal electrode 122 by the first insulating part 121a. It is spaced apart from the electrode 121.

The first and second internal electrodes 121 and 122 are respectively connected to the first and second external electrodes 141 and 142 by the first and second connection electrodes 131 and 132, thereby forming the dielectric layer 111. The area where the first and second internal electrodes 121 and 122 overlap each other can be increased, and thus the capacitance of the capacitor component 10 can be increased.

The first connection electrode 131 penetrates the body 110 in the thickness direction and is connected to the first internal electrode 121, and the pair of first connection electrodes 131 are connected to each other by V1 in the width direction of the body 110. They are placed spaced apart.

The second connection electrode 132 penetrates the body 110 in the thickness direction and is connected to the second internal electrode 122, and the pair of second connection electrodes 132 are connected to each other by V1 in the width direction of the body 110. They are placed spaced apart.

When the width direction length of the first and second internal electrodes 121 and 122 is defined as W, V1/W and V2/W are 0.7 or more.

The first and second connection electrodes 131 and 132 may be formed by filling a via penetrating the body 110 with a conductive material. It can be formed by applying a conductive paste or filling a conductive material using a method such as plating. Main constituent materials of the conductive material include nickel (Ni), copper (Cu), palladium (Pd), and silver (Ag), and alloys thereof may also be used.

Figure 6 schematically shows a circuit board 100 on which a capacitor component 10 is mounted according to an embodiment of the present invention.

As the frequency increases, alternating current flows through the capacitor component 10, and the ESL is determined by the magnetic flux generated by this current. Therefore, in order to minimize ESL, it is important to minimize the current path.

In addition, when the current signal becomes high frequency, it tries to form the shortest path with the smallest impedance, so when the high frequency signal flows, the current signal flows closer to the other devices 30 and 40. Therefore, the arrangement of the connection electrode affects ESL, and by setting V1/W and V2/W to 0.7 or more, ESL can be lowered by shortening the current path (F').

Figure 4 schematically shows a cross-sectional view in the width and length directions of a capacitor component according to another embodiment of the present invention. Figure 5 is an enlarged view of B in Figure 4.

Referring to FIGS. 4 and 5, when the area where the first and second internal electrodes 121 and 122 are not formed is defined as the margin M based on the longitudinal and width direction cross-section of the body, the first and second internal electrodes 121 and 122 are defined as the margin M. A portion of the second connection electrodes 131 and 132 may be disposed in the margin portion M.

Accordingly, the current path (F') between the capacitor component mounted on the board 20 and the other elements 30 and 40 can be made shorter, which has the effect of further lowering the ESL. In addition, the area where the first and second internal electrodes 121 and 122 overlap can be increased compared to the case where a portion of the first and second connection electrodes 131 and 132 are not disposed in the margin portion M. , thus the capacitor capacity can be increased.

At this time, when the cross-sectional area of the first and second connection electrodes 131 and 132 is defined as S, and the area of S excluding the area formed in the margin portion M is defined as A, A/S may be 0.70 or more.

If A/S is less than 0.70, the contact between the internal electrode and the connecting electrode may be poor, which may reduce reliability.

Therefore, in order to ensure reliability while lowering ESL as much as possible, it is desirable for A/S to be 0.70 or higher.

After manufacturing the sample by adjusting the arrangement spacing of the first and second connection electrodes 131 and 132, capacity, ESL, and reliability were tested and are listed in Table 1 below.

At this time, the pair of first connection electrodes were arranged with the distance spaced apart in the width direction of the body as V, and the pair of second connection electrodes were arranged with the distance spaced apart in the width direction of the body as V, and then V/W was measured and listed in Table 1 below.

In addition, A/S was measured with the cross-sectional area of the first and second connection electrodes being S, and the area of S excluding the area formed in the margin portion being A, and the results are listed in Table 1 below.

Reliability was evaluated by whether or not there was a contact defect between the internal electrode and the connecting electrode. 100 samples were measured, and if there were 0 contact defects, it was marked as good, and if there was more than 1 contact defect, it was marked as bad.

exam number V/W A/S Capacitance (μF) ESL(pH) reliability One* 0.450 1.00 0.46 48.17 Good 2* 0.500 1.00 0.46 47.40 Good 3 0.750 1.00 0.46 45.95 Good 4 0.875 0.90 0.47 45.26 Good 5 0.900 0.83 0.47 44.87 Good 6 0.925 0.76 0.47 45.27 Good 7* 0.975 0.67 0.48 45.35 error 8* 1.000 0.59 0.48 45.65 error 9* 1.025 0.41 0.48 46.21 error

In test numbers 1 and 2, V/W was less than 0.7 and the ESL was high.

In the case of test numbers 7 to 9, it can be seen that A/S is less than 0.7, indicating poor reliability.

On the other hand, in the case of test numbers 3 to 6 where V/W is more than 0.7 and A/S is more than 0.7, it can be confirmed that ESL is low and reliability is excellent.

Meanwhile, referring to FIGS. 2 and 3 , the first and second connection electrodes 131 and 132 may be arranged to be spaced apart from each other in the longitudinal direction in the central portion C when the body is divided into three parts in the longitudinal direction. By disposing the first and second connection electrodes 131 and 132 in the central portion (C), the current path (F) can be minimized, thereby lowering the ESL. However, depending on the diameter of the first and second connection electrodes 131 and 132, the shape of the body 110, etc., the first and second connection electrodes 131 and 132 may be disposed in areas other than the central portion C, It should be noted that the present invention does not exclude the case where the first and second connection electrodes 131 and 132 are disposed in areas other than the central portion C.

In addition, if the distance (H) between the first and second connection electrodes is too short, there is a risk of short circuit defects due to contact, so the first and second connection electrodes must be spaced a certain distance in consideration of their diameters. It is desirable to form

The first external electrode 141 is disposed on one side of the body 110 and connected to the first connection electrode 131, and the second external electrode 142 is disposed on one side of the body 110 and is connected to the second connection electrode ( 132).

Meanwhile, the first and second external electrodes 141 and 142 may be disposed on only one side of the body 110. In this way, if the first and second external electrodes 141 and 142 are disposed on only one side of the body 110, they can be defined as electrodes. The capacitor component 10 having such a bottom electrode structure reduces the margin on the side connecting the upper and lower surfaces of the body 110 and increases the area where the first and second internal electrodes 121 and 122 are formed. The capacitor capacity of the capacitor component 10 can be improved. That is, the capacitor component 10 according to an embodiment of the present invention has a bottom electrode structure, and has a structure in which the internal electrode is connected to the external electrode by a connection electrode penetrating the body, so the capacitor capacity can be improved.

Although the embodiments of the present invention have been described in detail above, the present invention is not limited by the above-described embodiments and the attached drawings, but is intended to be limited by the appended claims.

Accordingly, various forms of substitution, modification, and change may be made by those skilled in the art without departing from the technical spirit of the present invention as set forth in the claims, and this also falls within the scope of the present invention. something to do.

10: Capacitor parts
110: body
111: dielectric layer
112: cover layer
121, 122: internal electrode
131, 132: connection electrode
141, 142: external electrode

Claims (6)

A body including first and second internal electrodes alternately disposed with a dielectric layer interposed therebetween;
a pair of first connection electrodes that penetrate the body in the thickness direction, are connected to the first internal electrode, and are spaced apart from each other by V1 in the width direction of the body;
a pair of second connection electrodes that penetrate the body in the thickness direction, are connected to the second internal electrode, and are spaced apart from each other by V2 in the width direction of the body; and
It includes first and second external electrodes disposed on the body and connected to the first and second connection electrodes, respectively,
When the width direction length of the first and second internal electrodes is defined as W, V1/W and V2/W are 0.75 or more,
Based on the cross-section in the length and width directions of the body, the area where the first and second internal electrodes are not formed is the margin, the cross-sectional area of the first and second connection electrodes is S, and the area formed in the margin among the S is When the excluded area is defined as A, A/S is more than 0.76,
The first and second connection electrodes are disposed only in the central portion when the body is divided into three parts in the longitudinal direction and are spaced apart from each other in the longitudinal direction.
According to paragraph 1,
A capacitor component in which a portion of the first and second connection electrodes are disposed in the margin portion.
delete delete According to paragraph 1,
The first connection electrode is spaced apart from the second internal electrode by a second insulating part, and the second connection electrode is spaced apart from the first internal electrode by a first insulating part.
According to paragraph 1,
A capacitor component in which the first and second external electrodes are disposed only on one side of the body.

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