JPH0128496B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a composite electronic component device in which elements such as capacitors, resistors, and coils are built into a flat base material. The purpose is to improve the

In conventional composite electronic components, in order to reduce distributed capacitance and mutual induction between each element in a flat substrate,
Some had configurations such as increasing the distance between adjacent elements or providing ground electrodes between the elements. However, the above-mentioned conventional structure has many drawbacks, such as a considerable waste of space within the limited area of the composite electronic component and the generation of new distributed capacitance relative to the ground. Ceramic films also had long thin grooves (slits), but they had the disadvantage of being easily broken.

The present invention solves the above-mentioned conventional drawbacks, and is characterized by providing a large number of columnar cavities in rows between elements in one plane. DESCRIPTION OF THE PREFERRED EMBODIMENTS As an embodiment of the present invention, an electronic component device having a composite capacitor will be described below with reference to the drawings.

Figure 1 is a front view of the composite capacitor, Figure 2 is A
-A cross-sectional top view taken along line A. 1 is a base material made of a dielectric material formed into a plate shape. This base material is
A printing method that thickens and forms by printing several times,
It is formed by a sheet construction method, etc., in which sheet-shaped dielectrics are bonded together and fired.

Note that in the case of forming a composite coil, a magnetic material is preferable as a base material, and an insulating material is preferable as a resistor and other base materials in general.

A composite capacitor using the sheet construction method will be explained below. The dielectric material is formed into a sheet called a green sheet with a thickness of about 40 μm, and if necessary, electrodes 2, 3, and 4 with a thickness of several μm are formed on the surface of the sheet by printing. Leading electrodes 2a, 3a, and 4a are formed from each electrode to one of the end faces. Also, for green sheets, a large number of round holes are punched in a row. These green sheets are combined and laminated to form end electrodes 5, which are connected to the extraction electrodes 2a, 3a, and 4a.
After printing 6 and 7, it is fired to make a composite.

In the drawing, electrode 2 and electrode 4 form a first capacitor, and electrode 3 and electrode 4 form a second capacitor. As is clear from the drawings, 4 is a single continuous common electrode. By stacking the green sheets provided with the row of holes, a row of cylindrical cavities 8 are formed between the electrodes 2 and 3.

In the above configuration, the dielectric constant between the electrodes 2 and 3 is greatly reduced due to the row of columnar cavities, and the dielectric constant between the electrodes 2 and 3 is greatly reduced.
The distributed capacitance between can be made sufficiently small. This is because the dielectric constant of the base material made of dielectric material is large, ranging from tens to tens of thousands, while the dielectric constant of the air inside the cavity is 1, and the cross-sectional area of the dielectric material portion between electrodes 2 and 3 is large. This is because the cavity was significantly narrowed. Note that the larger the inner diameter of the cavity, the greater the effect, but if it is too large, or in the extreme, all the cavities are connected to form a single groove, the base material body will easily break, which is not practical. Furthermore, even if large holes are made in the green sheet, the shape becomes unstable during sintering, which is a drawback, and large grooves and the like cannot be provided.

In the above embodiment, two capacitors are arranged side by side in a plane in the base material 1, but next, an embodiment will be described in which two capacitors are arranged side by side in different planes. FIG. 3 is a front view of another embodiment, and FIG. 4 is a cross-sectional top view taken along line BB. In this case as well, the sheet construction method is used.

11 is a base material, 12 and 13 are electrodes, and 14 is a common electrode. Electrodes 12, 14 form a first capacitor, electrodes 13, 14 form a second capacitor, and the two capacitors lie in the same plane. On the other hand, 15 and 16 are electrodes, and the electrodes 15 and 14 form a third capacitor, and the electrodes 16 and 14 form a fourth capacitor. The third and fourth capacitors are in the same plane, but in a different plane from the first and second capacitors. Note that 12a, 13a, 1
4a, 15a, 16a are extraction electrodes of each electrode, 1
Reference numerals 7, 18, 19, 20, and 21 are end surface electrodes connected to the extraction electrodes and provided on the end surfaces. 22
is a cylindrical cavity formed by stacking the sheets, and the hole previously formed in the sheet by punching in the same manner as in the embodiment described above is a cylindrical cavity formed by stacking the sheets, and extends from the surface to the depth of the common electrode 14 between the electrodes 12 and 13. are arranged in a row at Further, 23 is also a cylindrical hollow portion, which is provided in a line between the electrodes 15 and 16 from the other surface to the depth of the common electrode.
The rows of cylindrical cavities 22 and 23 are the fourth column.
As is clear from the figure, they are installed in different positions,
Therefore, they are present in the base material 1 in a staggered manner.

According to this configuration, a row of cylindrical cavities 22 is provided between the first and second capacitors, equivalently lowering the dielectric constant and reducing the distributed capacitance between the electrodes 12 and 13. On the other hand, there is a row of cylindrical cavities 23 between the third and fourth capacitors, which equivalently lowers the dielectric constant and reduces the distributed capacitance between the electrodes 20 and 21. At this time, by differentiating the positions of the rows of cylindrical cavities 22 and 23, it is possible to prevent the base material main body from being easily broken from the center.

In each of the above examples, a green sheet with holes was formed by punching, but this itself can be easily formed, so the process is almost the same as the conventional one, mass production is high, and the cost is almost negligible. It doesn't rise.

In addition, although the above describes an electronic component device that combines capacitors, when combining resistors and coils, if cylindrical or prismatic cavities are formed in a row between each element, the electrodes can be connected to each other. Distribution capacity can be made sufficiently small. Further, it is possible to reduce mutual induction between coils. Furthermore, if a vibrating body such as a ceramic vibrator is used, it is also possible to adjust the amount of vibration wetting.

As described above, according to the present invention, a plurality of electrodes or resistors are formed in at least one plane of a flat base material, and a large number of columnar cavities are formed in the base material between these electrodes or resistors. By dispersing the columnar cavities in a single row without being continuous, it is possible to reduce the overall shape, greatly reduce the distributed capacitance between the different electrodes or resistors, and make it difficult to crack. This makes it possible to provide a composite electronic component device having excellent electrical characteristics without compromising mass productivity. Furthermore, even if multiple electrodes or resistors are similarly formed on different planes of the base material, sufficient strength of the base material can be ensured by varying the position of each row of columnar cavities. be.

[Brief explanation of drawings]

FIG. 1 is a front view of a composite capacitor in an embodiment of the composite electronic component device of the present invention, and FIG.
3 is a front view of a composite capacitor of another embodiment, and FIG. 4 is a sectional view taken along line BB in FIG. 3. 1... Base material, 2, 3, 4... Electrode, 8... Cylindrical cavity, 11... Base material, 12, 13, 14, 1
5, 16... Electrode, 22, 23... Cylindrical cavity.

Claims (1)

[Claims] 1. A plurality of electrodes or resistors are formed in at least one plane of a flat base material, and a large number of columnar cavities are formed in the base material between these electrodes or resistors in each columnar shape. A composite electronic component device characterized in that the hollow portions are not continuous but are scattered in a single row. 2 A plurality of electrodes or resistors are provided in different planes in a base material, and a large number of columnar cavities are provided in the base material between the electrodes or resistors on each plane, and each columnar cavity is not continuous. Claims characterized in that the columnar cavities are scattered in rows, and the rows of columnar cavities provided on the first plane are different from the rows of columnar cavities provided on the second plane. The composite electronic component device according to item 1.