JPS645872Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a multilayer capacitor whose capacitance can be adjusted in stages.

Conventionally, as shown in FIG. 1, a multilayer capacitor has been manufactured by laminating a plurality of dielectric sheets 1, 1, . . . , 1, . . . , 1, 1, electrodes 5 formed on the dielectric sheets 1, 1, .
5, . . . are alternately drawn out from every other dielectric sheet 1, 1, .

By the way, in this type of multilayer capacitor, the capacitance C is determined by the dielectric constant ε of the dielectric sheet 1,
It is uniquely determined by the area of the electrode 5 and the number and thickness of the dielectric sheets 1.

For this reason, the capacitance C
If the capacitance C is not within the standard range (small C, large C), the capacitance C cannot be adjusted, and as shown in Figure 2, the capacitance C cannot be adjusted. Products other than non-defective products with a capacity of C were discarded as having no C, missing C, small C, or large C.

In addition, in the multilayer capacitor as mentioned above,
Even if the designed capacitance C was obtained, it was impossible to change the capacitance C by changing the application thereafter.

The present invention was made in view of the above-mentioned circumstances regarding conventional multilayer capacitors, and its purpose is to
In conventional multilayer capacitors, by changing the number of electrodes formed on the dielectric sheet connected to the external electrodes, the total opposing area of the electrodes is changed, and the capacitance of the multilayer capacitor is adjusted in stages. .

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

In Figures 3, 4 and 5, 11
a, 11b,..., 11a, 11b are dielectric sheets; 12 is a dielectric sheet 11a, 11b,..., 1
Electrodes 13 and 14 formed on 1a and 11b, respectively
is a connection electrode, and 15 and 16 are external electrodes.

As shown in FIG. 6, the dielectric sheet 11a is a rectangular sheet material 17 made of a dielectric material.
A dielectric sheet 11a having an electrode 12a formed on one main surface of the sheet material 17 with a certain width left at the periphery of the sheet material 17, and a rectangular small hole 18 provided approximately at the center of one side of the electrode 12a. As shown in FIG. 7, a dielectric material is formed on one main surface of a sheet material 17 similar to the above, with an electrode 12b formed on the periphery of the sheet material 17 and the periphery of the small hole 18 by a certain width. It consists of a sheet 11b.

The electrode 12b of the dielectric sheet 11b is connected to the side 19 of the sheet material 17 near the small hole 18.
It has an extraction electrode part 21 for extraction on the opposite side 20 of the electrode.

The above-mentioned lead-out electrode section 21 includes each dielectric sheet 11b.
As a result, as can be seen from FIG. 3, they are sequentially displaced in the direction of the side 20 of the sheet material 17.

The dielectric sheets 11a and 11b having the above electrode structure are as shown in FIGS. 3 and 4.
The lead electrode portions 21, 21, .
3 and 14 are connected to an external electrode 15 formed on one end surface of the stacked body 22 of the dielectric sheets 11a and 11b.

Note that among the connection electrodes 13 and 14, the connection electrode 14 is as shown in FIGS. 3 and 4.
Among the dielectric sheets 11b, 11b, . . . , 11b, the electrodes 12b of the dielectric sheets 11b, 11b, .

On the other hand, the dielectric sheets 11a, 11a,..., 11
Each electrode 12a, 12a, .

If the multilayer capacitor has the electrode configuration as described above and the connecting electrodes 13 are sequentially cut in the middle, the total facing area of the electrodes of the multilayer capacitor changes in stages. Furthermore, if the connection electrode 14 is separated at the connection part of the electrode 12b of the dielectric sheet 11b with the extraction electrode part 21, the area of the electrode 12b at this part changes in the stacking direction of the dielectric sheets 11a and 11b. , the change in the total opposing area becomes smaller.

Therefore, when manufacturing a multilayer capacitor as shown in FIGS. 3 to 4, one having a capacitance larger than the desired capacitance is manufactured, and when testing the capacitance, the connection electrodes 13 and 14 are connected to an appropriate By cutting at a certain position, a multilayer capacitor having a specified capacitance can be obtained.

In addition, in the above embodiment, the dielectric sheet 11
In place of the small holes 18 in the sheet material 17 of a and 11b,
Various configurations can be made, such as embedding the external electrode 16 in this notch as a notch. Further, without providing the small hole 18 or the notch, an extraction electrode may be connected to the electrode 12a so that the electrode 12a is led out to the outside of the laminate. Furthermore, the shapes of the connection electrodes 13 and 14 are not limited to those shown in the drawings.

As is clear from the detailed description above, the present invention reduces the number of electrodes connected to external electrodes through connection electrodes in conventional multilayer capacitors by cutting or connecting the connection electrodes so that the total number of electrodes facing each other is reduced. Since the area is changed, the capacitance changes according to the total facing area of the electrodes, and the capacitance is made larger than the specified value during manufacturing.
It is possible to match the specified capacitance during inspection.
A connecting electrode that can be used as a simple trimmer capacitor that adjusts the capacitance by cutting or connecting the connecting electrode.The capacitance can be selected to the required value at the time of shipment, and manufacturing and inventory types can be standardized. is provided on the side surface of the laminate of dielectric sheets, so that the capacitance can be easily adjusted even after being mounted on a printed circuit board.

[Brief explanation of drawings]

Fig. 1 is a vertical cross-sectional view of a conventional multilayer capacitor, Fig. 2 is a distribution diagram showing the incidence of good and defective products during the manufacturing of conventional multilayer capacitors, and Fig. 3 is a top view of the multilayer capacitor according to the present invention. , FIG. 4 is a cross-sectional view taken along the line -- in FIG. 3, FIG. 5 is a cross-sectional view taken along the line -- in FIG. 3, and FIGS. 6 and 7 are plan views of the electrode-forming surface of the dielectric sheet. 11a, 11b...dielectric sheet, 12a, 1
2b... Electrode, 13, 14... Connection electrode, 15,
16... External electrode, 17... Sheet material, 18...
Small hole, 21... Leading electrode part.

Claims (1)

[Claims for Utility Model Registration] (1) A plurality of dielectric sheets each having a roughly rectangular shape are laminated in a rectangular parallelepiped shape, and the dielectric sheets are formed on the side surfaces parallel to the lamination direction of the laminated body of dielectric sheets. In a multilayer capacitor formed by drawing out electrodes, a dielectric sheet is provided with an extraction electrode portion extending from the electrode to the side surface of the laminate, and these extraction electrode portions are formed on the side surface of the laminate of dielectric sheets. 1. A multilayer capacitor, characterized in that the multilayer capacitor is connected by an electrode, and the connection electrode is electrically connected to an external electrode formed on the end face of the multilayer body. (2) The upper dielectric sheet has the same electrode area as the first
and a second group in which the area of the electrodes changes sequentially in the stacking direction of the dielectric sheets, the electrodes of the first group of dielectric sheets and the electrodes of the second group of dielectric sheets. 2. The multilayer capacitor according to claim 1, wherein the multilayer capacitor is electrically connected to the external electrode by a separate connecting electrode.