JPH05190379A - Capacitance adjustment of laminated capacitor - Google Patents

Abstract

PURPOSE:To raise environment resistance and to reduce the number of manufacturing processes of a laminated capacitor. CONSTITUTION:A lamination adding part 4 constituted by alternately laminating capacitance adjustment adding electrodes 6 and a dielectric body internal part is integrally provided on the outer layer of a laminated body 3 consisting of a dielectric body 1 and an internal electrode 2, and the adding electrode 6 is buried between dielectric bodies 7 and 1 in the entire laminate body including the lamination adding part 4. A laminated capacitor having a portion facing the internal electrode 2 through only the dielectric bodies 7 and 1 is provided, and the lamination adding part 4 of the laminated capacitor is ground parallel to the laminated surface so as to delete a specified number of adding electrodes 6, thus capacitance is adjusted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a capacitance adjusting method for a multilayer capacitor.

[0002]

2. Description of the Related Art As a method for adjusting the capacitance of a multilayer capacitor, the one shown in FIG. 6 is conventionally known. In the figure, (A) is a longitudinal sectional view and (B) is a plan view.

First, a dielectric 21 is used as a multilayer capacitor.
The capacitor 23 is formed by alternately stacking the internal electrode 22 and the internal electrode 22, and the capacitance adjusting electrode 24 is formed on the upper surface or the lower surface of the stacked body 23. Then, the capacitance adjustment electrode 24 is ground by sandblasting or laser irradiation to adjust the capacitance. In the figure, reference numeral 25 is an external electrode.

[0004]

By the way, in the conventional method for adjusting the capacitance of the multilayer capacitor, since the capacitance adjusting electrode 24 is exposed to the outside, there is a problem in environment resistance and migration occurs due to the influence of moisture. Or a flashover occurs.

In order to prevent problems such as migration, it is necessary to perform insulation processing after the capacitance adjustment, which results in many processing steps and high cost.

In view of the above-mentioned conventional problems, the present invention improves the environment resistance and reliability of the multilayer capacitor, reduces the number of manufacturing steps, and reduces the cost of the multilayer capacitor. It is an object to provide an adjustment method.

[0007]

In order to achieve the above object, the present invention has a method for adjusting the capacitance of a multilayer capacitor as follows. That is, a laminated addition portion is integrally provided on an outer layer of a laminated body including a dielectric and an internal electrode, and the laminated addition portion is formed by alternately laminating additional electrodes for capacitance adjustment and dielectrics. Is a multilayer capacitor that is embedded between the dielectrics inside the entire laminated body including the laminated addition portion and has a portion facing the internal electrode through only the dielectric, and the laminated addition portion of this laminated capacitor is prepared. Is polished parallel to the laminated surface to remove the required number of additional electrodes.

[0008]

In the method of adjusting the capacitance of the multilayer capacitor having the above structure, not only the additional electrode is not exposed to the outside before the capacitance adjustment, but also after the capacitance adjustment, the additional electrode on the surface layer side is removed and the dielectric inside the electrode is removed. The electrode for capacitance adjustment (additional electrode) does not expose the additional electrode on the inner layer side only by exposing it.
Does not need to be insulated in a separate process.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the present invention will be described below with reference to the illustrated embodiments. 1A and 1B show a multilayer capacitor used in a capacitance adjusting method according to a first embodiment of the present invention. FIG. 1A is a vertical sectional view before the capacitance adjustment, FIG. 1B is a plan view thereof, and FIG. A later vertical sectional view, (D) is a plan view thereof.

As shown in FIGS. 1A and 1B, in this multilayer capacitor, a stacking addition portion 4 is provided on the outer layer of a stacking body 3 in which dielectrics 1 and internal electrodes 2 are stacked alternately. It is provided integrally. External electrodes 5 and 5 ′ are provided on both left and right ends of the entire laminated body including the laminated body adding portion 4, and each internal electrode 2 in the laminated body 3 is alternately arranged on the left and right external electrodes 5.
It is connected to 5 '.

The stacking addition section 4 includes an additional electrode 6 for adjusting the capacitance.
And the dielectric 7 are alternately laminated, and the additional electrode 6 is embedded between the dielectrics 7 (or 1) to form the laminated body 3
It is laminated and integrated. There are usually a plurality of additional electrodes 6, three additional electrodes 6 in this embodiment, all of which are connected to one external electrode 5. These additional electrodes 6 extend to the side of the other external electrode 5 ′ toward the surface layer so that any of the additional electrodes 6 can be extended.
Also has a portion facing the internal electrode 2 connected to the other external electrode 5 ′ via only the dielectrics 7 and 1, so that a capacitance corresponding to the facing portion is generated between the internal electrode 2 and the internal electrode 2. Is becoming According to FIG. 1A, the additional electrode 6 in the inner layer
Is the portion of E ₁ , the additional electrode 6 of the intermediate layer is the portion of E ₂ , and the additional electrode 6 of the surface layer is the portion of E ₃ , which faces the nearest internal electrode 2.

As described above, in the state before the capacitance adjustment, the additional electrode 6 for capacitance adjustment is buried between the dielectrics 7 and is not exposed to the outside.

Next, a capacity adjusting method will be described. Capacitance adjustment is performed on the unadjusted multilayer capacitor shown in FIGS. 1A and 1B, and the stacking addition portion 4 is parallel to the stacking surface, and the dielectric 7 of any inner layer from the outer layer side. , 1 is removed and the required number of additional electrodes 6 are removed. In the illustrated example, the second layer dielectric 7 is ground from the outside, the additional electrode 6 on the surface layer is removed, and an adjusted multilayer capacitor as shown in (C) and (D) is obtained. In this capacitance adjustment, by removing the additional electrode 6 on the surface layer, E of the additional electrode 6 is removed.
_The total capacity is reduced by the capacity corresponding to the part of ₃ .

2A and 2B show a multilayer capacitor used in a capacitance adjusting method according to a second embodiment of the present invention. FIG. 2A is a vertical sectional view before the capacitance adjustment, FIG. 2B is its plan view, and FIG. Is a vertical sectional view after capacity adjustment, and (D) is a plan view thereof.

In this laminated capacitor, a laminated addition portion 4 formed by alternately laminating an additional electrode 6 for capacitance adjustment and a dielectric 7 is laminated on an outer layer of a laminated body 3 composed of a dielectric 1 and an internal electrode 2. The point of being integrated is the same as that of the first embodiment, and the portions corresponding to those of the first embodiment are designated by the same reference numerals.

The multilayer capacitor of this embodiment is different from that of the first embodiment in the way of forming the additional electrode 6. That is, although each of the additional electrodes 6 is connected to one of the external electrodes 5, as shown in FIG. 2B, the additional electrode 6 has a width narrower than that of the laminated body 3 and is different from that of each of the other additional electrodes 6. The additional electrodes 6 are formed at different width positions from each other, so that any of the additional electrodes 6 is connected to the other external electrode 5 '.
Are opposed to each other via only the dielectrics 7 and 1, and a capacitance is generated between the internal electrodes 2 and.

The capacitance adjusting method in the multilayer capacitor of the second embodiment is the same as that of the first embodiment, and the lamination adding portion of the unadjusted multilayer capacitor shown in FIGS. 2A and 2B. 4 is polished in parallel with the laminated surface from the outer layer side to any of the inner layer dielectrics 7 and 1 to remove the required number of additional electrodes 6. In the illustrated example, the second layer dielectric 7 is ground from the outside, the additional electrode 6 on the surface layer is removed, and an adjusted multilayer capacitor as shown in (C) and (D) is obtained. In this capacitance adjustment, the overall capacitance is reduced by the amount corresponding to the additional electrode 6 on the surface layer.

FIG. 3 shows a multilayer capacitor used in a capacitance adjusting method according to a third embodiment of the present invention. (A) is a longitudinal sectional view before the capacitance adjustment, (B) is a plan view thereof, and (C). Is a vertical sectional view after capacity adjustment, and (D) is a plan view thereof.

The multilayer capacitor of the third embodiment is basically the same as the first and second embodiments except that the lamination addition portion 4 is provided on the outer layer of the lamination body 3. The internal structure of each stacking addition unit 4 is different from that of the first and second embodiments. That is, in the laminated body 3 of this embodiment, the inner electrode 2 connected to the outer electrodes 5, 5'and the intermediate inner electrode 2A not connected to any of the outer electrodes 5, 5'interpose the dielectric 1 between them. Are stacked. Further, in the stacking addition portion 4, the additional electrode 6A for capacitance adjustment is stacked alternately with the dielectric 7 in the form of an intermediate electrode which is not connected to any of the external electrodes 5 and 5 '.

The additional electrode 6A as an intermediate electrode
Of the surface layer, the longer it spreads between the outer electrodes 5 and 5 ′, so that any additional electrode 6 A is
The internal electrode 2 and the dielectric 7, which are connected to the external electrodes 5 and 5 ',
It has a portion facing each other via only 1 and produces an intermediate capacitance corresponding to the facing portion with the internal electrode 2.

The capacitance adjusting method in the multilayer capacitor of the third embodiment is the same as that of the first and second embodiments, and the unadjusted multilayer shown in FIGS. 2A and 2B is used. The laminated addition portion 4 of the capacitor is polished in parallel with the laminated surface from the outer layer side to any one of the inner layer dielectrics 7 and 1 to remove the required number of additional electrodes 6A. In the illustrated example, the second layer dielectric 7 is polished from the outside, the additional electrode 6A on the surface layer is removed, and an adjusted multilayer capacitor as shown in (C) and (D) is obtained. In this capacitance adjustment, both external electrodes 5, 5 '
Since the additional electrode 6A on the surface layer is not interposed between the pair of internal electrodes 2 and 2 respectively connected to, the total capacitance is reduced by the intermediate capacitance.

FIG. 4 is a longitudinal sectional view showing a state before the capacitance adjustment of the multilayer capacitor used in the capacitance adjusting method of the fourth embodiment of the present invention. As in this embodiment, the laminating unit 4
May be provided in both upper and lower outer layers of the laminated body 3 including the dielectric 1 and the internal electrode 2. In this example, the stack 3
The internal electrodes 2 are both connected to the external electrodes 5 and 5'as in the first or second embodiment, and the additional electrode 6 of each laminated additional portion 4 is also connected to either one of the external electrodes 5.
It is connected to (5 ').

FIG. 5 is a longitudinal sectional view showing a state before the capacitance adjustment of the multilayer capacitor used in the capacitance adjusting method of the fifth embodiment of the present invention. In this embodiment, as in the third embodiment, the stacking addition portion 4 having the additional electrode 6A which is not connected to any of the outer electrodes 5 and 5'is provided on both upper and lower outer layers of the stack 3 having the intermediate inner electrode 2A. It is provided.

The method of adjusting the capacitance in the multilayer capacitor used in the above-mentioned fourth or fifth embodiment is not particularly different from the case of the first or second embodiment, and the upper and lower outer layers of the laminated body 3 are the same. It is sufficient to grind each of the laminated addition portions 4 in parallel with the laminated surface and remove the required number of additional electrodes 6 (6A).

[0025]

As described in detail above, according to the present invention,
Before and after the capacitance is adjusted, the additional electrode for capacitance adjustment is embedded between the dielectrics, and the capacitance adjustment electrode is not exposed to the outside like the conventional capacitance adjustment method of a multilayer capacitor. Excellent in reliability and improved in reliability.

Further, since the additional electrode for adjusting the capacitance is not exposed to the outside, the subsequent insulation processing is unnecessary, and the manufacturing process is simplified.

[Brief description of drawings]

1A and 1B show a multilayer capacitor used in a first embodiment of the present invention and a method for adjusting the capacitance thereof, where FIG. 1A is a longitudinal sectional view before the capacitance adjustment, FIG. 1B is a plan view thereof, and FIG. A vertical cross-sectional view after capacity adjustment, (D) is a plan view thereof.

2A and 2B show a multilayer capacitor used in a second embodiment of the present invention and a method for adjusting the capacity thereof, where FIG. 2A is a longitudinal sectional view before adjusting the capacity, FIG. 2B is its plan view, and FIG. A vertical cross-sectional view after capacity adjustment, (D) is a plan view thereof.

3A and 3B show a multilayer capacitor used in a third embodiment of the present invention and a method of adjusting the capacitance thereof, where FIG. 3A is a vertical sectional view before the capacitance adjustment, FIG. 3B is its plan view, and FIG. A vertical cross-sectional view after capacity adjustment, (D) is a plan view thereof.

FIG. 4 is a vertical sectional view showing a multilayer capacitor used in a fourth embodiment of the present invention and a capacitance adjusting method thereof, showing a state before capacitance adjustment.

FIG. 5 is a vertical sectional view showing a multilayer capacitor used in a fifth embodiment of the present invention and a capacitance adjusting method thereof, showing a state before capacitance adjustment.

FIG. 6 shows a method of adjusting the capacitance of a conventional multilayer capacitor,
(A) is a longitudinal sectional view and (B) is a plan view thereof.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Dielectric 2 Internal electrode 2A Internal electrode (intermediate electrode) 3 Laminated body 4 Laminated addition part 6 Additional electrode 6A Additional electrode (intermediate electrode) 7 Dielectric

Front page continuation (72) Inventor Katsuhiko Hashimoto 2-10-10 Tenjin, Nagaokakyo-shi, Kyoto Murata Manufacturing Co., Ltd.

Claims (1)

[Claims] 1. A stacking addition part (4) is integrally provided on an outer layer of a stacking body (3) comprising a dielectric (1) and an internal electrode (2), and the stacking addition part (4) is for capacity adjustment. The additional electrodes (6) and the dielectrics (7) are alternately laminated, and the additional electrodes (6) are disposed inside the entire laminated body including the laminated addition portion (4). ), A capacitance adjustment type capacitor having a portion facing the internal electrode (2) via only the dielectric (7, 1) is prepared, and a laminated addition portion (4) of this laminated capacitor is prepared. A method for adjusting the capacitance of a multilayer capacitor, characterized in that the required number of additional electrodes (6) are removed by polishing in parallel with the laminated surface.