JPH0360148A - Laminated type lcr element - Google Patents

Abstract

PURPOSE:To increase the values of capacitance and inductance by alternately laminating magnetic substance layers and capacitor electrode layers, laminating alternately magnetic substance layers and spiral patterns for a coil in the manner in which the spiral patterns are connected between layers, and forming a resistor on the magnetic substance layer. CONSTITUTION:Magnetic substance sheets 5a-5i are formed by using resin sheets impregnated with magnetic substance powder of ferrite; spiral patterns 6a-6d of a coil part 2 are formed by spreading Ag-Pb conductive paste on the upper and the lower surfaces of the magnetic substance sheets 5a-5d by printing. At this time, through holes 10 are previously formed on the magnetic sheets 5a-5d by plating. Similarly, capacitor electrodes 8a, 8b of a capacitor part 3 are formed by spreading Ag-Pb conductive paste on the upper surface of magnetic substance sheets 5e-5h by printing. A resistor 11 of a resistor part 4 is formed by spreading RuO2 paste on the upper surface of the magnetic substance sheet 5i by printing. The magnetic substance sheets 5a-5i prepared in the above manner are stacked together with dummy sheets 15, which are fixed en bloc by pressure and formed in a laminated body. After that, external electrodes A, B, C are printed on the right and the left parts and the central part of the laminated body.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an LCR element for electromagnetic interference countermeasures or an LCR element for a membrane circuit.
The present invention relates to a stacked LCR element used as a CR element or the like.

Conventional Technologies and Problems Conventionally, this type of multilayer device has a capacitor portion in which dielectric layers and capacitor electrode layers are alternately laminated, and a capacitor portion in which dielectric layers and coil spiral patterns are alternately laminated. It is known that the capacitor part and the coil part are integrally laminated.

The capacitor section and the coil section are electrically connected to form an LC circuit inside the chip. A multilayer element with such a structure uses only a dielectric material for the element matrix, so the capacitor part has a large capacitance C, but the coil part is similar to a so-called air-core coil, and the inductance L is small. Only small values of can be obtained.

Therefore, as an improvement to the laminated element, it has been proposed to use a magnetic layer instead of the dielectric layer only in the coil portion. A stacked LC element with such a structure is
A capacitance C and an inductance L having large values can be obtained.

However, in device manufacturing, the dielectric layer and the magnetic layer must be fired under the same firing conditions, which limits the material for the dielectric layer, complicates the manufacturing process, and requires precise production control. There was a problem that

In addition, this type of stacked LC element is often combined with a resistor element to form a desired circuit, and as a result, mounting it on a printed wiring board occupies a large area, making it impossible to meet the recent needs for higher density. It's coming.

Therefore, an object of the present invention is to provide a multilayer LCR element that has large values of capacitance C and inductance L, also includes a resistance element, and is excellent in mass production.

In order to solve the problem more than the means for solving the problem, the stacked LCR according to the present invention
The element includes a capacitor portion in which magnetic layers and capacitor electrode layers are alternately laminated, and magnetic layers and coil spiral patterns are alternately layered such that the coil spiral patterns are connected between the layers. a resistor part having a resistor formed on a surface of a magnetic layer, the capacitor part, the coil part and the resistor part forming a laminated structure, and the capacitor electrode layer and the coil part The spiral pattern and the resistor are electrically connected to each other via external electrodes.

Due to the configuration described above, only a magnetic material is used for the element matrix, so the coil portion functions as a so-called cored coil, and has a large value of inductance L due to the magnetic permeability of the magnetic material itself.

On the other hand, the capacitor section has a relatively large value of capacitance C by utilizing the dielectric constant of the magnetic material itself filling between the capacitor electrodes. The inductance L and the capacitance C constitute an LCR circuit via the resistance R of the resistor and the external electrode.

EXAMPLES Hereinafter, examples of the stacked LCR element according to the present invention will be described with reference to the drawings.

The stacked LCR element 1 shown in FIG. 1 includes one coil,
It is equipped with a capacitor and a resistor. As shown in FIG. 1 (8), the coil part 2 and the capacitor part 3 are stacked vertically with three dummy sheets 15 interposed therebetween, and the coil part 2
The resistor section 4 is laminated on the upper side of the resistor section 4 with two dummy sheets 15 interposed therebetween. Furthermore, two dummy sheets 15 are stacked above the resistor section 4 and three dummy sheets 15 are stacked below the capacitor section 3.

The coil portion 2 includes magnetic sheets 5a, 5b, 5c,
5d and coil spiral patterns 6a, 6b, 6c, and 6d formed on their surfaces. Ag--Pd conductive paste or the like is used as the material for the spiral patterns 6a, 6b, 6c, and 6d. The magnetic sheets 5a* 5b, 5c, and 5d are stacked in the vertical direction. The magnetic sheet 5a has a spiral pattern 6a formed on its upper and lower surfaces, and electrical connection between the upper and lower surfaces is made using through holes 10. The lead-out portion 7a of the spiral pattern 6a on the top surface is exposed on the left side of the magnetic sheet 5a. The connecting end 7b of the spiral pattern 6a on the lower surface is
In the stacked state, the spiral patterns 6a and 6b overlap with the connecting end 7c of the spiral pattern 6b formed on the magnetic sheet 5b, and the spiral patterns 6a and 6b are electrically connected. Similarly, connecting end 7d of spiral pattern 6b - spiral pattern 6c
The connecting ends 70 of the spiral pattern 6c and the connecting ends 7f of the spiral pattern 6c and the connecting ends 7g of the spiral pattern 6d are electrically connected. Therefore, in the stacked state, the spiral pattern 6a
.

6b, 6c, and 6d are electrically connected in series to form a coil. Note that the drawer portion 7h of the spiral pattern 6d on the lower surface of the magnetic sheet 5d
is exposed on the right side of the magnetic sheet 5d. The coil portion 2 having the above configuration includes magnetic sheets 5a and 5b.

It functions as a cored coil that is magnetically shielded by 5c and 5d, and has a large inductance L due to the large magnetic permeability of the magnetic material itself.

The capacitor section 3 includes magnetic sheets 5e, 5f, and 5g.
, 5h and capacitor electrodes 8b, 8a, 8b, and 8a formed on their upper surfaces, respectively. ) The material of the capacitor electrodes 8a * 8b is A.
Use conductive paste such as g-Pd. Capacitor electrode 8 formed on the top surface of magnetic sheets 5e and 5g
The drawer portions 9b and 9b of the magnetic sheets 5e and 8b are
, is exposed on the right side of 5g. Capacitor electrode 8a*
The drawer part 9a of 8a, 9a is a magnetic sheet 5f,
It is exposed on the left side of 5h. In the stacked state,
The capacitor section 3 has a capacitance C using the dielectric constant ε of the magnetic sheets 5e, 5f, and 5g filling the spaces between the opposing capacitor electrodes 8a and 8b. Usually, a magnetic sheet 5e.

By using a magnetic material having a dielectric constant ε of about 30 or more for 5f and 5g and reducing the thickness of the magnetic sheets 5e, 5f and 5g, a relatively large value of capacitance C can be obtained.

The resistor section 4 is composed of a magnetic sheet 51 and a resistor 11 formed on the upper surface thereof. Resistance book 11
In addition, carbon paste, Rub paste, metal resistor of Cu-Mn alloy, etc. are used.

One of the lead-out portions 12a of the resistor 11 is made of a magnetic material 5.
It is exposed on the right side of i. The other drawer portions 12b and 12
c are exposed at the center of the front side and the center of the back side of the magnetic sheet 5i, respectively. The resistor 11 has a resistance R between the lead-out portions 12a and 12b and between 12a and 12a, respectively.

Here, the magnetic sheets 58 to 51 and the dummy sheet 15
is a sheet made by printing or rolling a resin paste impregnated with magnetic powder such as ferrite. The magnetic sheets 58 to 51 and the dummy sheet 15 may all be made of the same magnetic material, or may be made of different magnetic materials depending on their respective purposes.

As shown in FIG. 1(b), the coil section 2, the capacitor section 3, and the resistor section 4 are stacked to form an integral laminate.

External electrodes (A) and (B) are placed on the left, right and center portions of this laminate.
, (C) are formed. External electrodes (A) and (B) have coil spiral patterns 6a and 6d with lead-out portions 7m,
7b and the lead-out portion 9a of the capacitor electrodes 8a, 8b,
9b is connected, and an inductance L and a capacitance C are formed in parallel between the external electrodes (A> and (B). Furthermore, the external electrode (B) is connected to the resistor 11. The lead portion 12b of the resistor 11 is connected to the external electrode (C).

Since 12c is connected, external electrodes (B)-(C)
A resistance R is formed between them. Therefore, a laminated LCR element 1 having several circuits as shown in FIG. 1(c) is obtained.

The laminated LCR element 1 having the above configuration was manufactured, and the results of measuring its electrical characteristics will be described in detail. The device to be measured was manufactured by the method shown below.

The magnetic sheets 5a to 51 were resin sheets impregnated with ferrite magnetic powder and having a thickness of 50 μm. The magnetic sheets 5a to 51 had a wide area and were later cut to a predetermined size. The spiral patterns 6a to 6d of the coil portion 2 are A
Magnetic sheet by printing g-Pd conductive paste)5
It was formed by coating on the upper and lower surfaces of a to 5d.

At this time, the through holes 10 are formed in advance in the magnetic sheets 5a to 5a.
5d by plating. Similarly, the capacitor electrodes 8a and gb of the capacitor section 3 are also made of Ag-Pd.
Magnetic sheets 5e to 5h are formed by printing conductive paste.
It was formed by coating it on the top surface of. The resistor 11 of the resistor section 4 is
Rub paste was applied to the upper surface of the magnetic sheet 5 by printing. The thus prepared magnetic sheets 58 to 51 are shown in FIG. 1(a) together with the dummy sheet 15.
After stacking them in the order shown, they were integrally pressure-molded to form a laminate. The laminate has the specified dimensions (32mm x 16mm x
After cutting into pieces (16 mmt), firing was performed at 900°C for 90 minutes. Thereafter, external electrodes (A), (B), and (C) were baked on the left, right, and center portions of the laminate. Electrical characteristics were measured using the device to be measured thus obtained.

The measurement results are shown in Table 1 below as Example ①.

[As is clear from the results of Example ■ in Table 1 below,
A multilayer LCR element was obtained in which the values of inductance L, capacitance C, and resistance R were practically usable. Example ■.

(2) increases the number of turns of the spiral pattern of the coil part 2 and the number of capacitor electrodes of the capacitor part 3 so that the inductance, capacitance C, and resistance R become three times and ten times the values of Example (2), respectively; In addition, these are the measurement results when the width of the resistor of the resistor section 4 is made smaller.

In addition, as a modification of this example, a laminated type L shown in FIG.
A CR element 16 was manufactured and its electrical characteristics were measured. The device to be measured was manufactured by the method shown below. First, the magnetic sheets 58 to 5h are stacked in the order shown in FIG. 2(a). At this time, the dummy sheet 15 is
3 on the upper side of the
Lay 3 sheets on top of each other under the capacitor section. After pressure-molding these together to form a laminate, the predetermined size (32 m
It was cut into a size (m x 16 mm x 16 mm). The cut laminate was fired at 900° C. for 90 minutes, and then Ru0g paste was applied by printing to the magnetic surface of this laminate and baked to form the resistor 11.

After this, external electrodes (A) are placed on the left, right, and center portions of the laminate.

(B) and (C) were printed. Furthermore, a glaze made of Pb0-Btu, -5iO* was applied to the surface on which the resistor 11 was formed, and then baked at a temperature of 850° C. to form a protective film 17 on the surface of the resistor 11. The device thus obtained has the same circuit configuration as the device shown in FIG. 1, as shown in FIG. 2(c). Electrical characteristics were measured using this device. The measurement results are shown in Example 2 in Table 1. There was no difference in the electrical properties from those obtained in Example (2), indicating that the laminated LCR element was practically usable. Example ■.

(2) is the inductance, and the number of turns of the spiral pattern of the fill part 2 and the number of capacitor electrodes of the capacitor part 3 are increased so that the values of capacitance C and resistance R become three times and ten times the values of Example (2), respectively. This is the measurement result when the width of the resistor 11 is made smaller.

3 to 6 each show other embodiments of the present invention.

The laminated LCR element 20 shown in FIG. 3 includes two coils, one capacitor, and one resistor. Figure 3 (
Coil parts 21 and 22 stacked vertically as shown in a)
A capacitor section 23 is stacked between the coil section 22 and a dummy sheet 15, and a resistor section 24 is stacked above the coil section 22 with a dummy sheet 15 interposed therebetween.

Both ends of a resistor 25 are connected to the external electrodes (A) and (B), and a resistance R is connected between the external electrodes (A) and (B).
is formed. Both ends of the coil spiral pattern 26 are connected to the external electrodes (A) and (C), and an inductance L1 is formed between the external electrodes (A) and (C). Furthermore, both ends of another coil spiral pattern 27 are connected to the external electrodes (B) and (C).
An inductance L2 is formed between B) and (C). The external electrodes (C) and (D) include capacitor electrodes 28a,
28b are connected to each other, and the external electrodes (C)-
(D), a capacitance C is formed between them, so that a laminated LCR element 20 having the equivalent circuit shown in FIG. 3(C) is obtained.

The laminated LCR element 30 shown in FIG. 4 includes one coil, one resistor, and two capacitors. Figure 4 (
As shown in a), capacitor parts 31 and 32 are stacked vertically with a dummy sheet 15 in between, a coil part 33 is stacked on top of the capacitor part 32 with a dummy sheet 15 in between, and further, a coil part 33 is stacked on top of the capacitor part 32 with a dummy sheet 15 in between. A resistor section 34 is laminated on the dummy sheet 15 via the dummy sheet 15. external electrode (A),
Both ends of the resistor 35 and both ends of the coil spiral pattern 36 are connected to (B), and the external electrodes (A)-(B)
A resistance R and an inductance L are formed in parallel therebetween. Capacitor electrodes 37b and 37a are connected to the external electrodes (A) and (C), respectively, and a capacitance C1 is formed between the external electrodes (A) and (C>).

Furthermore, other capacitor electrodes 38b and 38a are connected to the external electrodes (B) and (C), respectively, and a capacitance C2 is formed between the external electrodes (B) and (C). Therefore, a laminated LCR element 30 having the equivalent circuit shown in FIG. 4(C) is obtained.

The laminated LCR element 40 shown in FIG. 5 includes one coil, one capacitor, and two resistors. Figure 5 (
As shown in a), a coil section 41 and a capacitor section 42 are stacked vertically with a dummy sheet 15 in between, and resistor sections 43 and 44 are stacked above and below with a dummy sheet 15 in between. Both ends of the resistor 45 and both ends of the coil spiral pattern 46 are connected to the external electrodes (A) and (B), and a resistance R1 and an inductance L are connected in parallel between the external electrodes (A) and (B). It is formed with Both ends of another resistor 47 are connected to the external electrodes (B) and (C), and a resistance R2 is formed between the external electrodes (B) and (C). In addition, the external electrode (
Capacitor electrodes 48g and 48b are connected to B) and (D), respectively, and a capacitance C is formed between the external electrodes (B) and (D). Therefore, Fig. 5(c)
) A laminated LCR element 40 having the equivalent circuit shown in FIG.

The stacked LCR element 50 shown in FIG. 6 is an array type element each having four fills, four capacitors, and four resistors. As shown in FIG. 6(a), a coil section 51 and a capacitor section 52 are stacked vertically with a dummy sheet 15 in between, and a dummy sheet 15 is placed on top 411 of the coil section 51.
A resistor section 53 is stacked with the resistor section 53 interposed therebetween. External electrode (AI
) and (CI) are connected to both ends of the leftmost resistor 54 of the four resistors and coil spiral pattern 55, and there is a resistance R and an inductance L between the external electrodes (AI) and (CI>). Out of the four external electrodes (At) and (Bl), the leftmost capacitor electrode 56b is formed in a parallel relationship.

56b, 56a, and 56a are connected, respectively.
A capacitance C is formed between the external electrodes (AI) and (Bl). Similarly, other external electrodes (A2
> to (C4) are also connected to both ends of the resistor 54 and coil spiral pattern 55, or to the capacitor electrode 56a,
56b to form a resistance R1 inductance L or capacitance C between the external electrodes.

Therefore, an array type stacked LCR element 50 in which four circuits are arranged in parallel as shown in FIG. 6(c) is obtained.

However, the present invention is not limited to the array type, and it is also possible to form a plurality of resistors R1 inductances L1 and capacitances C at arbitrary positions, and various circuits can be arbitrarily configured. can.

Note that the stacked LCR element according to the present invention is not limited to the above-mentioned embodiments, and can be variously modified within the scope of the gist thereof.

It is not always necessary to use a magnetic sheet to form the magnetic layer; instead, a resin paste impregnated with magnetic powder can be stacked and printed multiple times to form appropriate spiral patterns for capacitor electrodes, resistors, and coils. There may be.

According to the present invention, since the base of the element is composed only of magnetic material, the coil portion functions as a so-called cored filter, and a large value of inductance L can be obtained due to the large magnetic permeability of the magnetic material. It will be done. On the other hand, in the capacitor section, a relatively large value of capacitance C can be obtained by utilizing the dielectric constant of the magnetic material itself filled between the capacitor electrodes. These inductance L and capacitance C constitute an LCR circuit with resistance R of a resistor to provide a laminated LCR element.

Furthermore, since they can be manufactured using the same magnetic material, the manufacturing process is simple and the production period can be shortened.

Furthermore, since a plurality of coils, capacitors, and resistors can be mounted in one element, the installation work can be simplified and costs can be reduced in the assembly process.

Since it is a chip-type element, it can be mounted on a surface, and it occupies a small area when mounted on a printed wiring board, allowing high-density mounting.

Moreover, since the coil, capacitor, and resistor are magnetically shielded with magnetic material, no harmful electromagnetic waves are emitted around the element.

[Brief explanation of drawings]

FIG. 1 shows a stacked LCR device that is an embodiment of the present invention, (a) is an exploded perspective view of the device, (b) is a perspective view showing the external appearance of the device, and (e) is an equivalent circuit. It is a diagram. Second
The figures show a modification of the element shown in Fig. 1, in which (a) is an exploded perspective view of the element, (b) is a perspective view showing the external appearance of the element, (
c) is an equivalent circuit diagram. 3, 4, 5, and 6 show other embodiments, in which (a) is an exploded perspective view of the device, (b) is a perspective view showing the external appearance of the device, and (c) ) is an equivalent circuit diagram. DESCRIPTION OF SYMBOLS 1... Laminated LCR element, 2... Coil part, 3...
- Capacitor section, 4... Resistance section, 58-51... Magnetic layer (magnetic sheet), 6a-6d... Spiral pattern for coil, 8a, 8b... Capacitor electrode layer (capacitor electrode) , 10... through hole, 11...
Resistor, 15... Magnetic layer (dummy sheet), 16.
20... Multilayer LCR element, 21.22... Coil part, 23... Capacitor part, 24... Resistance part, 25
...Resistor, 26.27... Coil spiral pattern, 28a, 28b... Capacitor electrode layer (capacitor electrode), 30... Multilayer LCR element, 31.32...
... Capacitor part, 33... Coil part, 34... Resistor part, 35... Resistor, 36... Coil spiral pattern, 37a, 37b, 38a, 38b ・":'
Capacitor electrode layer (capacitor electrode), 40... Multilayer LCR element, 41... Coil part, 42... Capacitor part, 43° 44... Resistor part, 45... Resistor, 4
6... Coil spiral pattern, 47... Resistor, 4
8a, 48b... Capacitor electrode layer (capacitor electrode), 50... Multilayer LCR element, 51... Coil section, 52... Capacitor section, 53... Resistance section, 54
... Resistor, 55 ... Spiral pattern for coil, 56
a, 56b... Capacitor electrode layer (capacitor electrode)
, (A). (B), (C), (D), (AI), (Bl),
(C1), (A2) to (C4>...external electrodes.

Claims (1)

[Claims] 1. A capacitor part in which magnetic layers and capacitor electrode layers are alternately laminated; and a coil part in which magnetic layers and coil spiral patterns are alternately laminated such that the coil spiral patterns are connected between the layers. and a resistance part in which a resistor is formed on the surface of a magnetic layer, wherein the capacitor part, the coil part, and the resistance part form a monolayer structure, and the capacitor electrode layer and the coil spiral pattern and a multilayer LCR element, characterized in that the resistor is electrically connected via an external electrode.