JPH07106196A - Laminated ceramic electronic component with built-in capacity - Google Patents

Abstract

PURPOSE:To adjust an electrostatic capacity in a wide range without lowering the mechanical strength and the Q of the title electronic component and without remarkably lowering its weatherability by a method wherein a part of a laminated body which is composed of a ceramic layer and an internal electrode is cut. CONSTITUTION:A pattern for an internal electrode 3 is formed as a pattern in which a narrow-width part 2a whose width is narrower than that of other parts is formed in a shallow position from a face 3a nearly perpendicular to a face on which the internal electrode 2 has been formed in a laminated body 3 which is composed of a ceramic layer 1 and the internal electrode 2. A part of the laminated body 3 is cut up to a prescribed depth from the face 3a nearly perpendicular to the face on which the internal electrode 2 has been formed of the laminated body 3. Thereby, the narrow-width part 2a at the internal electrodes 2 in a prescribed number is cut, and opposite areas of the internal electrodes 2 are adjusted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ceramic electronic component, and more particularly to a capacitor built-in type monolithic ceramic electronic component such as a ceramic capacitor or an LC composite component.

[0002]

2. Description of the Related Art For example, as a method of adjusting the electrostatic capacitance of a built-in capacitance type monolithic ceramic electronic component such as a ceramic capacitor or an LC composite component, there is a method of removing an internal electrode by using a laser or the like.

A conventional monolithic ceramic capacitor generally has a ceramic layer 21 and an internal electrode 2 as shown in FIG.
2 are alternately laminated horizontally, and the internal electrodes 22 are drawn out every other layer to the opposite end face side of the laminated body 23 of the ceramic layers 21 and the internal electrodes 22 to form external electrodes 24. It is connected. And, for example,
As shown in FIG. 6, by removing a part of the internal electrode 22 together with the ceramic layer 21 from the upper surface 23a side of the laminated body 23 of the ceramic layer 21 and the internal electrode 22 by using a laser or the like, the internal electrodes face each other. The capacitance is adjusted by changing the area.

[0004]

However, in the above-mentioned conventional method, when the capacity is adjusted by removing one internal electrode, for example, when the trimming range (that is, the capacity adjusting range) is increased, the cutting area is increased. I have to do it. In addition, if the trimming range is further increased, not only one internal electrode but also a plurality of internal electrodes are cut (for example, a plurality of internal electrodes are cut at a predetermined position, and the facing area of the internal electrodes as a whole is cut). Is required to be changed significantly), and as shown in FIG.
It is necessary to cut 3 to a deep position.

Therefore, the above conventional capacity adjusting method is
There are problems that the mechanical strength of the monolithic ceramic capacitor is lowered, the quality of the ceramic layer is changed in a wide range by the heat of the laser, the Q is lowered, or the weather resistance is significantly deteriorated.

The present invention solves the above-mentioned problems. By cutting a part of the laminated body of the ceramic layer and the internal electrodes, the mechanical strength and Q are lowered, and the weather resistance is remarkable. An object of the present invention is to provide a multilayer ceramic electronic component with a built-in capacitor that can adjust the electrostatic capacitance in a wide range without causing deterioration.

[0007]

In order to achieve the above-mentioned object, the capacitor built-in type multilayer ceramic electronic component of the first invention of the present application is obtained by stacking a ceramic layer and an internal electrode.
In a capacitor built-in multilayer ceramic electronic component having a structure in which internal electrodes are opposed to each other with a ceramic layer in between, the pattern of the internal electrodes is substantially perpendicular to the surface of the laminated body of the ceramic layers and the internal electrodes on which the internal electrodes are formed. The pattern is such that a narrow portion having a narrower width than other portions is formed at a position shallower than the surface of the laminated body, and the laminated body is exposed from the side of the laminated body which is substantially perpendicular to the surface on which the internal electrodes are formed. The structure is characterized in that a narrow portion of a predetermined number of internal electrodes can be cut by cutting the portion to a predetermined depth.

In addition, the second aspect of the present invention is a built-in capacitor type laminated ceramic electronic component having a structure in which the ceramic layer and the internal electrode are laminated so that the internal electrodes are opposed to each other with the ceramic layer interposed therebetween. In the electronic component, the pattern of the internal electrodes has a narrow portion narrower than other portions at a position shallower from a surface of the laminated body of the ceramic layer and the internal electrodes substantially perpendicular to the surface on which the internal electrodes are formed. With a pattern that is formed, a part of the laminated body is cut to a predetermined depth from the side of the laminated body that is substantially perpendicular to the surface on which the internal electrodes are formed. It is characterized in that the area is cut to adjust the facing area of the internal electrodes.

In the capacitor built-in multilayer ceramic electronic component of the present invention, there is no particular limitation on the number of narrow portions to be formed on each internal electrode, and one or a plurality of narrow portions may be formed for each internal electrode. It is possible to form, also, there is no particular restriction as to which internal electrode of the plurality of internal electrodes is provided with a narrow width portion, all the internal electrodes may be provided with a narrow width portion, Further, the narrow width portion may be provided only in a specific internal electrode.

[0010]

In the capacitor built-in type monolithic ceramic electronic component of the first invention of the present application, the internal electrode is located at a position shallower than the surface of the laminated body of the ceramic layer and the internal electrode, which is substantially perpendicular to the surface on which the internal electrode is formed. Since the pattern is formed so that a narrow width portion that is narrower than other portions is formed, it is possible to cut a part of the laminated body to a predetermined depth without cutting the laminated body in a wide range or to a deep position. Only by cutting up to that point, it becomes possible to cut a predetermined number of internal electrodes in the narrow width portion and adjust the facing area of the internal electrodes in a wide range. Therefore, the capacitance is not deteriorated by cutting the laminated body in a wide range or in a deep position, the deterioration of the mechanical strength, the deterioration of the Q due to the alteration of the ceramic layer, or the remarkable deterioration of the weather resistance. Can be adjusted in a wide range.

Further, in the multilayer ceramic electronic component with built-in capacitor according to the second aspect of the present invention, only a part of the surface of the laminated body substantially perpendicular to the surface on which the internal electrodes are formed is cut to a predetermined depth, The facing area of the internal electrodes is adjusted by cutting the narrow portion of the internal electrodes, which is located at a shallow position from the surface of the stacked body that is substantially perpendicular to the surface on which the internal electrodes are formed.
Therefore, the mechanical strength is not reduced by cutting the laminated body in a wide range or at a deep position, the Q is not deteriorated due to the alteration of the ceramic layer, or the weather resistance is not significantly deteriorated. It is possible to obtain an accurate adjusted highly reliable multilayer ceramic electronic component with a built-in capacitor.

In the capacitor built-in monolithic ceramic electronic component of the present invention, the number of internal electrodes to be cut and, if each internal electrode is provided with a plurality of narrow width portions, the cut points and the internal electrodes to be cut The adjustment range of the electrostatic capacity can be managed by the number of sheets.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a partially exploded perspective view showing a built-in capacitor type laminated ceramic electronic component (a chip type laminated ceramic capacitor in this example) according to an example of the first invention of the present application.

As shown in FIG. 1, the capacitance built-in type monolithic ceramic electronic component of the present embodiment is formed by alternately laminating the ceramic layers 1 and the internal electrodes 2, and the internal electrodes 2 are provided every other layer. It is drawn out to the opposite end face of the laminated body 3 and connected to the external electrode 4. The vicinity of the portion of each internal electrode 2 that is drawn out to the end surface of the laminated body 3 is a narrow portion 2a that is narrower than the other portions.

That is, in this capacitance built-in type monolithic ceramic electronic component, the pattern of the internal electrodes 2 is substantially perpendicular to the surface of the laminated body 3 of the ceramic layer 1 and the internal electrodes 2 on which the internal electrodes 2 are formed. (Upper surface) At a shallow position from 3a,
The pattern is formed so that the narrow portion 2a is formed. However, in the capacitor-embedded multilayer ceramic electronic component of the present invention, the required characteristics and applications such as in which position of the internal electrode the narrow width portion is formed, in which internal electrode the narrow width portion is formed, etc. In consideration of the above, it is possible to make an appropriate decision. From the viewpoint of simplifying the manufacturing process, it is desirable that the position where the narrow width portion is formed is a position that does not matter the directionality such as front and back in the cutting stage.

In this capacitance built-in laminated ceramic electronic component, as shown in FIG. 2, a part of the laminated body 3 is cut from the upper surface 3a side of the laminated body 3 to a predetermined depth by using, for example, a laser. By doing so, a predetermined number of internal electrodes (not shown in FIG. 2) are cut into narrow portions, and the facing area of the internal electrodes 2 (FIG. 1) as a whole is adjusted to adjust the capacitance. It can be carried out.

In this embodiment, the cutting portion (cutting portion) 6a
Is only a part of the laminated body 3, and by cutting a part of the laminated body 3 from its upper surface 3a to a predetermined depth, a predetermined number of internal electrodes 2 are cut at the narrow width portion 2a, The facing area of the electrode 2 can be adjusted in a wide range. Therefore, the electrostatic capacity is not deteriorated by cutting the laminated body 3 in a wide range or at a deep position without lowering mechanical strength, deterioration of Q due to alteration of the ceramic layer, or remarkable deterioration of weather resistance. Can be adjusted in a wide range to obtain a desired capacitance.

In the above embodiment (FIG. 2), the laminated body 3
The case where the cutting portion 6a is formed by cutting only a part on the right side of the above is described, but further another part is cut (for example, as shown in FIG. 3, a part on the left side of the laminate 3 is cut to form a cutting part). By forming 6b), it is possible to increase the adjustment range of the facing area of the internal electrode 2, that is, the adjustment range of the capacitance.

However, the cutting location, the cutting depth, etc. are not limited to those in the above embodiment, and the size of the capacitance to be formed, the pattern of the internal electrodes, the stacking pitch, the position of the narrow portion, etc. It is possible to determine a preferable cutting location in consideration.

As a means for cutting the laminate, a laser is used because it is excellent in workability and can be quickly trimmed even if the cutting amount (trimming amount) is large. Although preferable, various known cutting means other than laser can be used.

The capacitance built-in type monolithic ceramic electronic component (FIGS. 2 and 3) of the above embodiment in which the capacitance is adjusted by cutting the narrow portion 2a of the internal electrode 2 is the second embodiment of the present invention. It corresponds to the built-in capacitor type multilayer ceramic electronic component of the present invention.

FIG. 4 is a partially exploded perspective view showing a capacitance built-in type monolithic ceramic electronic component according to another embodiment of the first invention of the present application.

In the capacitor built-in type monolithic ceramic electronic component of this embodiment, the internal electrodes 2 having the narrow width portions 2a formed at three positions at regular intervals are alternately laminated with the ceramic layers 1 and each layer is laminated. And is connected to the external electrode 4 formed on the end surface side of the laminated body 3 including the ceramic layer 1 and the internal electrode 2.

In this multilayer ceramic electronic component with a built-in capacitor, since each internal electrode 2 is formed with a plurality of narrow width portions 2a, electrostatic discharge can be achieved by appropriately selecting the cutting location and the number of internal electrodes to be cut. The capacity can be adjusted more finely.

In the above embodiments, the chip-type monolithic ceramic capacitor has been described as an example, but the present invention is not limited to the chip-type monolithic ceramic capacitor, and various types of capacitance built-in type monolithic capacitors such as ceramic filters (LC composite parts). It can be applied to ceramic electronic components.

Also in other respects, the present invention is not limited to the above-mentioned embodiment, and the specific pattern of the internal electrodes such as the number of narrow portions and formation positions, the number of laminated internal electrodes, and Various applications and modifications can be made within the scope of the invention with respect to the number of internal electrodes to be cut in the width portion, the position to cut the laminate, and the like.

[0027]

As described above, in the capacitor-embedded monolithic ceramic electronic component according to the first aspect of the present invention, the pattern of the internal electrodes is located at a position shallower than the surface of the laminated body substantially perpendicular to the surface on which the internal electrodes are formed. The pattern is such that a narrow portion is formed,
From the surface side of the laminated body which is substantially perpendicular to the surface on which the internal electrodes are formed,
By cutting a part of the laminated body to a specified depth, it is possible to cut a narrow part of the internal electrodes of a specified number, so it is possible to cut a specified number of parts by cutting a part of the laminated body to a specified depth. It becomes possible to cut the internal electrode of the above in the narrow portion and adjust the facing area of the internal electrode in a wide range. Therefore, the mechanical strength is reduced by cutting the laminated body in a wide range or to a deep position,
It is possible to obtain a multilayer ceramic electronic component with a built-in capacitor capable of adjusting the electrostatic capacitance in a wide range without deteriorating Q due to alteration of the ceramic layer or significantly deteriorating weather resistance.

In the capacitor built-in type multilayer ceramic electronic component of the second invention of the present application, the internal electrode pattern is
Part of the surface of the laminate, which is substantially perpendicular to the surface on which the internal electrodes are formed, has a pattern such that a narrow portion is formed at a shallow position from the surface of the laminate on which the internal electrodes are formed. Since the opposing area of the internal electrodes is adjusted by cutting only the area to a predetermined depth and cutting the narrow part of the internal electrodes, it is possible to mechanically cut the laminated body in a wide range or to a deep position. It is possible to obtain a highly reliable capacitor built-in type monolithic ceramic electronic component in which the electrostatic capacitance is accurately adjusted without causing deterioration of the strength or Q due to alteration of the ceramic layer or deterioration of weather resistance.

[Brief description of drawings]

FIG. 1 is a partially exploded perspective view showing a built-in capacitor type monolithic ceramic electronic component according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a capacitance built-in monolithic ceramic electronic component according to an embodiment of the present invention in which the capacitance is adjusted.

FIG. 3 is a perspective view showing a capacitance built-in type monolithic ceramic electronic component according to an embodiment of the present invention in which the capacitance is adjusted.

FIG. 4 is a partial exploded perspective view showing a built-in capacitor type laminated ceramic electronic component according to another embodiment of the present invention.

FIG. 5 is a partial exploded perspective view showing a conventional multilayer ceramic electronic component with a built-in capacitor.

FIG. 6 is a perspective view showing a conventional capacitance-embedded monolithic ceramic electronic component whose capacitance has been adjusted.

FIG. 7 is a perspective view showing a conventional capacity-embedded monolithic ceramic electronic component whose capacity has been adjusted.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Ceramic layer 2 Internal electrode 2a Narrow width part 3 Laminated body 3a Surface of the laminated body substantially perpendicular to the surface on which the internal electrode is formed (upper surface) 4 External electrode

Claims (2)

[Claims] 1. A capacitor built-in multilayer ceramic electronic component having a structure in which internal electrodes are opposed to each other through a ceramic layer by stacking the ceramic layer and the internal electrodes, the internal electrode pattern is a ceramic layer and an internal electrode. And the inner electrode of the laminated body is formed in a pattern such that a narrow width portion narrower than other portions is formed at a position shallower than the surface substantially perpendicular to the surface on which the internal electrode is formed. A capacitor built-in type having a structure capable of cutting a narrow width portion of a predetermined number of internal electrodes by cutting a part of the laminated body to a predetermined depth from a surface side substantially perpendicular to the formed surface. Multilayer ceramic electronic components. 2. A capacitor built-in type multilayer ceramic electronic component having a structure in which internal electrodes are opposed to each other through a ceramic layer by stacking the ceramic layer and the internal electrodes, the internal electrode pattern includes a ceramic layer and an internal electrode. And the inner electrode of the laminated body is formed in a pattern such that a narrow width portion narrower than other portions is formed at a position shallower than the surface substantially perpendicular to the surface on which the internal electrode is formed. The facing area of the internal electrodes was adjusted by cutting a part of the laminated body to a predetermined depth from the surface side substantially perpendicular to the formed surface to cut a narrow portion of the predetermined number of internal electrodes. A built-in capacitor type multilayer ceramic electronic component characterized by: