JPH03140006A - Electronic component for noise elimination - Google Patents

Abstract

PURPOSE:To evade the generation of band or crack even when a coil part and a capacitor are fired integrally by using ceramics for the base of the coil part. CONSTITUTION:A T-shaped noise filter 1 is provided with 2 spiral coils and a laminating capacitor and a capacitor part 4 is laminated between coil parts 2, 3. The coil part 2 consists of a ceramic sheet 5a and a coil spiral pattern 6a placed thereon and the coil part 3 consists of a ceramic sheet 5b and a coil spiral pattern 6b placed thereon. The capacitor part 4 consists of dielectric sheets 10a-10c and capacitor electrodes 11a-11c formed on them respectively, and since the base of the coil parts 2, 3 is made of a ceramics, the firing contract ratio of the coil parts is closer to that of the dielectric substance being the base of the capacitor part 4 in comparison with that of the magnetic substance. Thus, even when the coil parts 2, 3 and the capacitor part 4 are fired integrally, generation of band or crack is avoided.

Description

[Detailed description of the invention] Demon! TECHNICAL FIELD The present invention relates to a chip-type noise countermeasure electronic component having a laminated structure and incorporating a coil.

This type of chip-type noise countermeasure electronic components includes noise coilers, varistors, etc. A noise coiler can be constructed by combining a fundensor and a coil. Conventionally, a chip-type coiler having a laminated structure is manufactured by bonding a capacitor part made of a dielectric matrix and a coil part made of a magnetic matrix.

However, since the sintering shrinkage rates of the respective base bodies are greatly different, when the capacitor part and the coil part are joined by integral sintering, warping, cracking, etc. may occur in the capacitor part and the coil part.

On the other hand, there are many cases in which surges (abnormal voltages) enter electronic components such as ICs along with electromagnetic noise, and varistor components are sometimes required in addition to noise coilers in order to protect ICs and the like so that they function properly. Therefore, there has been a desire for a chip-type noise coiler that also has a varistor function and has a laminated structure. In this case, it is conceivable to join the varistor part and the coil part by integral sintering. However, when a magnetic material is used for the base body of the coil portion, there is a risk that warping, cracking, etc. may occur in the varistor portion and the coil portion due to the difference in firing shrinkage rate, as in the case of the noise coiler.

SUMMARY OF THE INVENTION An object of the present invention is to provide an electronic component for noise suppression in which a capacitor part and a coil part or a varistor part and a coil part can be joined together by integral sintering.

Means for Solving the Problems In order to solve the problems above, the electronic component for noise suppression according to the present invention includes: (a) a capacitor section in which dielectric sheets and capacitor electrode layers are alternately laminated; b) a coil portion consisting of a ceramic sheet and a coil spiral pattern formed on the surface of the ceramic sheet, the capacitor portion and the coil portion forming a laminated structure, and the capacitor electrode layer and It is characterized in that the coil spiral patterns are connected by electrical connection means.

(e) a varistor section in which varistor material sheets and varistor electrode layers are alternately laminated; (d) a coil section consisting of a ceramic sheet and a coil spiral pattern formed on the surface of the ceramic sheet; The varistor part and the coil part have a monolayer structure, and the varistor electrode layer and the coil spiral pattern are connected by an electrical connection means. In this case, it is preferable that the varistor material sheet is made of a high dielectric constant material.

Furthermore, it is preferable to use the same material as the dielectric sheet (or varistor material sheet) of the capacitor part (or varistor part) for the ceramic sheet of the coil part so that the firing shrinkage rate is the same.

Due to the above-described structure, the base material of the coil part is made of ceramics, so the sintering shrinkage rate is close to that of the dielectric material, which is the base material of the capacitor part, and the varistor material, which is the base material of the varistor part. Or barista department)
The coil part and the capacitor part (or varistor part) can be joined without warping or cracking even if they are fired together.

Further, when the varistor material sheet of the varistor section is made of a high dielectric constant material, the varistor becomes a noise coiler that also has a varistor function due to its dielectric constant characteristics.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the noise countermeasure electronic component according to the present invention will be described with reference to the accompanying drawings.

[First Embodiment, FIGS. 1 to 3] A T-type noise coiler 1 shown in FIG. 1 includes two spiral coils and one multilayer capacitor. Coil part 2
A capacitor section 4 is stacked between and 3. Furthermore, one insulating sheet 35 is laminated on the upper side of the coil part 2 and one sheet on the lower side of the coil part 3.

The coil portion 2 is composed of a ceramic sheet 5a and a coil spiral pattern 6a formed on the top surface of the ceramic sheet 5a. The ceramic sheet 5a is a sheet made by kneading dielectric powder with a resin binder. The spiral pattern 6a is formed using Ag--Pd conductive paste or the like by a method such as printing. The drawn-out portion 7a of the spiral pattern 6a is exposed on the left side of the ceramic sheet 5a.

A rectangular through hole 8 is provided in the center of the ceramic sheet 5a, and one end of the spiral pattern 6a is connected to this.

Similarly, the coil portion 3 is composed of a ceramic sheet 5b and a coil spiral pattern 6b formed on the top surface of the ceramic sheet 5b. The drawn-out portion 7b of the spiral pattern 6b is exposed on the right side of the ceramic sheet 5b. A rectangular connection electrode 9 is completely formed in the center of the upper surface of the ceramic sheet 5b, and one end of the spiral pattern 6b is connected to this.

The capacitor section 4 includes dielectric sheets 10a, 10b,
10c, and capacitor electrodes 11a, llb, and llc formed on their upper surfaces, respectively. The dielectric sheets 10a, 10b, 10c are Bar
Ceramic powder such as iOs is kneaded with an SL binder and made into a sheet. capacitor electrode 11a,
llb and lie are formed using Ag-Pd conductive paste or the like by a method such as printing. Rectangular through holes 12.12 are provided on the left and right sides of the capacitor electrode 118. Lead-out portions 14a, 1 of capacitor electrode 11b
4b is exposed at the center of the front side and the center of the back side of the dielectric sheet 10b. Rectangular through holes Is, 15 are provided on the left and right sides of the dielectric sheet 10b, with the capacitor electrode 11b sandwiched therebetween. The rectangular through holes 15 and 15 are connected to the dielectric sheet 10 in the fully laminated state.
It is electrically connected to the rectangular through hole 12.12 provided in a. A rectangular through hole 16 is provided in the center of the dielectric sheet 10c, and a rectangular through hole 16 is provided in the center of the dielectric sheet 10c.
c is connected to this. The capacitance C1 is the electrode 11a
It is formed between -11b and between llb and -11c.

The above-described coil parts 2, 3 and capacitor part 4 are laminated together with the insulating sheet 35, and then fired at a predetermined temperature to form a single laminated structure. At this time, the firing shrinkage rates of the ceramic sheets 5a, 5b of the coil parts 2, 3 are different from those of the dielectric sheets LOa, 10b, 10c of the capacitor part 4 compared to the case of conventionally used magnetic materials. Because they are close together, warping and cracking that occur during firing can be suppressed. In particular, using the same material as the dielectric sheets 10a, 10b, 10e for the ceramic sheets 5a, 5b so that they have the same firing shrinkage rate is most effective in preventing warping and cracking.

In this laminated state, the spiral pattern 68 formed on the ceramic sheet 5a is electrically connected to the capacitor electrode 11a via the rectangular through hole 8. Similarly, the capacitor electrode 11a is connected to the capacitor electrode 1 through the rectangular through holes 12 and 15.
1c, and furthermore, a capacitor electrode 11
c is electrically connected to the spiral pattern 6b via a rectangular through hole 16.

Next, the laminated structure has an external electrode (A) on its surface, (
B) and (C) are completed, and the T-shaped noise coiler 1 shown in FIG. 2 is obtained. The lead-out portions 7a and 7b of the coil spiral patterns 6a and 6b are not connected to the external electrodes (A) and (B), and inductances L1 and L2 are in a series relationship between the external electrodes (A) and (B). It has been completely formed. Furthermore, since the lead-out portions 14a and 14b of the capacitor electrode 11b are connected to the external electrode (C), a T-type noise coiler 1 having the electrical equivalent circuit shown in FIG. 3 is obtained. Note that the external electrode (C) may be wound around the body of the coiler 1.

[Second Actual Travel Example, Figures 1 and 4 to 6] In Figure 1, a sheet group having the configuration shown in Figure 4 is placed at position X between the dielectric sheet 10c and the ceramic sheet 5b. When inserted, a double T-shaped noise coiler 25 with three spiral coils and two laminated capacitors is obtained.

FIG. 4 shows a state in which the capacitor section 23 is completely disposed below the coil section 22. The coil section 22 is composed of a ceramic sheet 5C and each coil spiral pattern 6 formed on its upper surface. ceramic sheet 5c
A rectangular connection electrode 17 is formed at the center of the upper surface, and a rectangular through hole 18 is provided at a position closer to the right side, and the two terminal ends of the spiral pattern 6C read closely to these, respectively.

The capacitor section 23 includes dielectric sheets 10d, 10e,
10f and capacitor electrodes lid, lie, and llf formed on their upper surfaces, respectively. Rectangular through holes 19.19 are provided on the left and right sides of the capacitor electrode lid. Rectangular through holes 20 and 20 are provided on the left and right sides of the dielectric sheet 10e for capacitor electrodes l.
IE is placed in between. Dielectric sheet 10f
A rectangular through hole 21 is provided in the center of the hole.

Capacitance C2 is between electrodes 1id-1ie and 1ie-11
It is formed between f.

The sheet group having the configuration shown in FIG. 4 is inserted into the position X shown in FIG. 1 and laminated to form a fired laminated structure. In this laminated state, one end of the spiral pattern 6c formed on the ceramic sheet 5C is electrically connected to the capacitor electrode 11c via the connection electrode 17 and the rectangular through hole 16. The other end of the spiral pattern 6C is electrically connected to the capacitor electrode lid via a rectangular through hole 18. Similarly, the capacitor electrode lid is electrically connected to the capacitor electrode 11f through the rectangular through holes 19 and 20, and further, the capacitor electrode 11f is electrically connected to the spiral pattern 6b through the rectangular through hole 21. There is.

This monolayer structure has an external electrode (A) on its surface.

(B) and (C) are formed to obtain the double T-shaped noise coiler 25 shown in FIG. The electrical equivalent circuit is shown in FIG.

[Third Embodiment, FIGS. 7 to 9] The π-type noise coiler 26 shown in FIGS.
It has two spiral coils and two laminated capacitors. A coil section 29 is laminated between capacitor sections 27 and 28. In addition, one insulating sheet 35 is laminated on the upper side of the capacitor section 27 and one sheet on the lower side of the capacitor section 28. A capacitor electrode 11h is connected to the external electrode (A), a capacitor electrode 11g is connected to the external electrode (C), and a capacitance C1 is formed between the external electrodes (A) and (C). A capacitor electrode 11i is connected to the external electrode (B), a capacitor electrode 11j is connected to the external electrode (C), and a capacitance C2 is formed between the external electrodes (B) and (C). Further, one end of the coil spiral pattern 6d is connected to the external electrode (A), and the other end is electrically connected to the capacitor electrode 11i via the rectangular through hole 30, so that the external electrode (A") - (B), an inductance L1 is formed between them.Therefore, a π-type noise coiler 26 having the electrical equivalent circuit shown in FIG. 9 is obtained.

In addition, the inductance L1 between the external electrodes (A) and (B)
In order to increase the value of , a ceramic sheet with a spiral pattern formed between the dielectric sheet 10h and the ceramic sheet 5d may be further inserted.As in rHJ, the values of capacitance CI and C2 are increased. Therefore, between dielectric sheets 10g and 10h, or dielectric sheet 1
A dielectric sheet on which a capacitor electrode is formed may be further inserted between Oi and 10j.

[Fourth embodiment, FIGS. 10 to 12] Capacitor sections 4 and 2 shown in FIGS. 1, 4, and 7
3.27.28 becomes a varistor portion that also functions as a capacitor when a varistor material sheet having a high dielectric constant is used instead of the dielectric sheets 10a to 10j. The varistor material sheet having a high dielectric constant is made by kneading powder mainly composed of, for example, ZnO and an organic binder, and forming the mixture into a sheet.

Therefore, in the first embodiment, the dielectric sheet 108
When a material sheet having a high dielectric constant is used instead of 10c, a T-type noise coiler with a varistor function having an electrical equivalent circuit shown in FIG. 10 can be obtained. Similarly, in the case of the second embodiment, a double T-type noise coiler with a varistor function having the electric circuit shown in FIG.
In the case of the third embodiment, a π-type noise coiler with a varistor function having the electric circuit shown in FIG. 12 is obtained.

Note that the material used for the varistor material sheet is not limited to a material with a high dielectric constant, but may also be a material with a low dielectric constant. In this case, the varistor part has almost no capacitor function. Since there is no such thing, it functions only as a coil-varistor component.

[Other Embodiments] Note that the noise countermeasure electronic component according to the present invention is not limited to the above-mentioned embodiments, and can be modified in various ways within the scope of the gist. By changing the pattern formed on the sheets and changing the stacking configuration, various noise coilers such as L-shaped, double L-shaped, double π-shaped, etc. can be manufactured.

As is clear from the above explanation, according to the present invention, the matrix of the coil part is made of ceramics, so compared to a magnetic material, the dielectric material, which is the matrix of the capacitor part and the varistor part, Since the firing shrinkage rate is close to that of the varistor material, warping and cracking will not occur even if the coil part and the capacitor part (or the varistor part) are fired together, and a chip-type noise countermeasure electronic component that can be easily laminated can be obtained. Moreover, since ceramics have high mechanical strength, they can be used as electronic components for noise countermeasures with high mechanical strength.

In addition, if the varistor material sheet of the varistor part is made of a high dielectric constant material, a noise coiler that also has a varistor function can be obtained.1 For example, if a double T-shaped circuit is used, surge absorption can be performed in two stages, and the signal line It can be brought closer to the voltage, and in addition to protecting electronic components such as ICs,
It becomes possible to prevent these electronic components from malfunctioning.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view of a noise countermeasure electronic component according to a first embodiment of the present invention, FIG. 2 is a perspective view showing its external appearance, and FIG.
The figure is its electrical equivalent circuit diagram. FIG. 4 is a partially exploded perspective view of a noise countermeasure electronic component according to a second embodiment of the present invention, FIG. 5 is a perspective view showing the external appearance of the component, and FIG. 6 is an electrical equivalent circuit diagram thereof. FIG. 7 is an exploded perspective view of a noise countermeasure electronic component according to a third embodiment of the present invention, FIG. 8 is a perspective view showing its appearance, and FIG. 9 is an electrical equivalent circuit diagram thereof. FIG. 10, FIG. 11, and FIG. 12 are electrical equivalent circuit diagrams of a noise countermeasure electronic component according to a fourth embodiment of the present invention. 1...Electronic components for noise countermeasures (T-type noise coiler)
, 2.3... Coil part, 4... Capacitor part, 5a
. 5b, 5c, 5d--ceramic sheet, 6a,
6b, 6c, 6d... spiral pattern for coil, 10a, 10b, 10c, 10d, 10e. 10f, 10g, 10h, 10i, 10j - dielectric sheet, lla, llb. lie, lid, lie, llf, l1g,
llb, lli, llj = :I indensa Kanpoku,
22... Coil part, 23... Capacitor part, 25.
・・Electronic component for noise countermeasure (double T type noise coiler), 26 ・・Electronic component for noise countermeasure (π type noise coiler), 27.28 ・・Capacitor section, 29...
Coil part.

Claims (3)

[Claims] 1. a capacitor section in which dielectric sheets and capacitor electrode layers are alternately laminated; and a coil section consisting of a ceramic sheet and a coil spiral pattern formed on the surface of the ceramic sheet, the capacitor section and the coil 1. An electronic component for noise countermeasures, characterized in that the capacitor electrode layer and the coil spiral pattern are connected to each other by an electrical connection means. 2. a varistor section in which varistor material sheets and varistor electrode layers are alternately laminated; and a coil section consisting of a ceramic sheet and a coil spiral pattern formed on the surface of the ceramic sheet, the varistor section and the coil 1. An electronic component for noise countermeasures, characterized in that the varistor electrode layer and the coil spiral pattern are connected by an electrical connection means. 3. 3. The electronic component for noise countermeasures according to claim 2, wherein the varistor material sheet is made of a high dielectric constant material.