JPH05152134A - Green sheet for inductance component and inductance component using thereof - Google Patents

Abstract

PURPOSE:To obtain an inductance component wherein it is provided with an excellent electric characteristic and it is small-sized and thin in the inductance component which is used for various kinds of electronic apparatuses. CONSTITUTION:A green sheet for inductance component is constituted as follows: conductor layers 2, 4 and insulator layers 3, 5 are laminated alternately on a base film 1 to form a laminated body; through holes 6 are made in the laminated body; and one foil is formed by connecting ends, on one side, of the conductor layers 2, 4 with each other. The green sheet is transferred to a magnetic substrate; in addition, an E-shaped core composed of a magnetic substance is installed in the through holes 6; thus an inductance component is formed. Thereby, since the magnetic substance whose magnetic characteristic is high can be used and a magnetic flux is passed mostly through the magnetic substance, and it is possible to obtain the inductance component which is small- sized and thin and whose electric characteristic is excellent.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inductance component green sheet (hereinafter simply referred to as a green sheet) and an inductance component having a magnetic body using the same.

[0002]

2. Description of the Related Art In recent years, the miniaturization and thinning of inductance components have been promoted due to the demand for miniaturization and high density of electronic equipment.

Conventionally, as an inductance component, a winding-type inductance component obtained by winding a conductive wire, which is insulatingly coated on a magnetic material, is generally known. Further miniaturization,
To reduce the thickness, there has been proposed a laminated inductance component in which a conductor pattern is formed in a magnetic material by alternately laminating magnetic material layers and conductor layers by a printing method or a sheet method.

[0004]

However, in the above laminated inductor, the magnetic layer and the silver or the conductor layer containing silver as a main component must be fired at the same time. It is necessary to add copper or the like to lower the temperature. However, since copper deteriorates the magnetic characteristics, a magnetic body having sufficient magnetic characteristics cannot be used as the magnetic layer. Further, since the conductor is formed in the magnetic body, there is a problem in electrical characteristics that short-circuit magnetic flux is generated near the conductor and the inductance value is reduced.

On the other hand, in the wire-wound inductor, Mn-Zn or Ni-Zn ferrite having excellent magnetic properties can be used because the magnetic material is fired alone. However, there is a limit to miniaturization and thinning of parts, and there is a problem such as disconnection or heat resistance because a conductive wire is used.

Further, even if an attempt is made to integrate these inductance components together with a thick film resistor and a thick film capacitor to manufacture various small and thin modules, it is difficult to realize them due to the above problems. It was

The present invention solves the above problems, and an object of the present invention is to provide a green sheet which realizes an inductance component having a small size and a thin shape and excellent electric characteristics, and an inductance component using the green sheet.

[0008]

To achieve this object, the present invention provides a base film, a first insulator layer overlying a first conductor layer printed on the base film and the first insulator layer. A laminated body composed of a second insulator layer covering the second conductor layer printed on the insulator layer, wherein one end of the first conductor layer and one end of the second conductor layer are connected to each other. To form a single coil, and a through hole is further provided in the central portion of the laminated body to form a green sheet for an inductance component.

A magnetic substrate, a laminated body formed by transferring and firing the above-mentioned inductance green sheet on the magnetic substrate, and a magnetic body partially inserted into a through hole of the laminated body It is a component of an inductance component.

[0010]

With the above-mentioned structure, Mn-Zn system or Ni-Zn system having excellent magnetic properties as a magnetic body is obtained.
Since a sintered body of a system ferrite can be used and most of the generated magnetic flux passes through the magnetic body, an inductance component having excellent electrical characteristics can be obtained. Also,
Since the structure is made by stacking the insulator layer and the conductor layer, it is possible to reduce the size and thickness of the inductance component, especially when forming various modules on a ceramic substrate using a thick film resistor or a thick film capacitor. The above-mentioned characteristics of the inductance component of the present invention can be exhibited, and high integration can be achieved. Furthermore, since the insulator layer, the conductor layer, and the magnetic body are all fired products, the inductance component has excellent heat resistance.

[0011]

【Example】

(Embodiment 1) Hereinafter, a first embodiment of the present invention will be described with reference to the drawings.

1A and 1B are a front sectional view and a plan view of a green sheet according to a first embodiment of the present invention. Here, 1 is a base film used as a printing support, and 2 and 4 are the first and second base films, respectively.
Are conductive layers, 3 and 5 are first and second insulating layers, 6 is a through hole, and 7 is a terminal electrode. Further, FIG. 2 shows each printing pattern used at the time of printing. In FIG.
(A) and (c) are printing patterns of the first conductor layer 2 and the second conductor layer 4, and (b) and (d) are printing of the first insulator layer 3 and the second insulator layer 5. It is a pattern.
FIGS. 3 and 4 are an exploded perspective view and a sectional view of the inductance component according to the present embodiment, respectively.
Is a magnetic substrate, 9 is an adhesive layer, 10 is a laminated body of four layers after peeling off the green sheet base film 1, and 11 is an E-shaped core.

Next, the procedure for producing the green sheet in this embodiment will be described. First, an electrode paste containing silver as a main component is formed on a base film 1 serving as a printing support by using a printing pattern of the first conductor layer 2 in FIG. Formed. Then, 8 parts by weight of butyral resin, 24 parts by weight of butyl carbitol, and 4 parts by weight of butyl benzyl phthalate were mixed with 100 parts by weight of glass powder of alumina and lead borosilicate glass in a weight ratio of 6: 4. An insulator paste was produced by kneading using a triple roll. Base film 1 obtained by forming a first conductor layer 2 from this insulator paste
The first insulating layer 3 was formed by screen-printing the print pattern of the first insulating layer 3 shown in FIG. next,
The second conductor layer 4 is formed on the first insulator layer 3 by screen printing an electrode paste similar to that of the first conductor layer 2 using the print pattern of the second conductor layer 4 of FIG. 2C. Then, an insulating paste similar to that of the first insulating layer 3 is added to FIG.
The second insulating layer 5 was formed by screen printing using the print pattern of the second insulating layer 5 in (d). In this way, a green sheet of a four-layer laminate having one coil per green sheet was produced.

The electrical connection between the first conductor layer 2 and the second conductor layer 4 is at the center of the printed pattern, that is, after the first conductor layer 2 is formed, the first insulation layer is formed. When the body layer 3 is printed, the center of the first conductor layer 2 is not printed with an insulator, and the second conductor layer 4 is printed so that the connection is made. In the present embodiment, the first conductor layer 2 and the second conductor layer 4 are connected by the printing pattern as described above, but punching or laser perforation is performed and the conductors are connected by through holes. I don't mind if you go. Further, the insulator layer may have a low magnetic permeability and a high electrical insulation property, and the electrode may be a material having a low electric resistance such as silver, silver-palladium, copper or gold. Although the through holes 6 are formed by the printing pattern in this embodiment, the through holes 6 may be formed by a laser or a punching jig after forming the green sheet on the base film.

Next, a procedure for manufacturing an inductance component using the above green sheet will be described with reference to FIGS.

First, 100 parts by weight of glass powder of alumina and lead borosilicate glass in a weight ratio of 6: 4, 12 parts by weight of butyral resin, and butyl are placed on a magnetic substrate 8 made of Mn-Zn system or Ni-Zn system ferrite. Carbitol 2
4 parts by weight and 8 parts by weight of butylbenzyl phthalate were mixed, and an adhesive layer 9 was formed by screen printing using a paste prepared by kneading these with a triple roll. next,
The green sheet is heat-transferred onto the adhesive layer 9, that is, the temperature of the mold surface is 150 ° C. and the pressure is 12 from the base film of the green sheet using a heating press.
Hot pressing was performed under the conditions of 0 kg / cm ² and a pressing time of 30 seconds, and then the base film was peeled off to form a four-layer laminate 10.

Next, E consisting of Mn-Zn type ferrite
Glass paste is applied to the contact portion between the V-shaped core 11 and the magnetic substrate 8 to bring the E-shaped core 11 into contact with the magnetic substrate 8.
Fixed 440 ℃ for removing the binder in the air
After being held for 30 minutes on the way, it was baked at 850 ° C. for 2 hours. As a result of measuring the inductance of the obtained inductance component at a measurement frequency of 500 kHz using an LCR meter, it was 200 μH when the Mn—Zn ferrite was used for the magnetic substrate 8 and 150 μH when the Ni—Zn ferrite was used.

As described above, the inductance component of this embodiment has excellent electrical characteristics and is thin because it is formed by stacking the conductor layer and the insulator layer, and is an inductance component having excellent heat resistance. ..

Although only one green sheet is transferred to the magnetic substrate 8 in this embodiment, the coils can be connected in parallel or in series by transferring an arbitrary number of green sheets. In addition, the thermal transfer of the green sheet to the magnetic substrate 8 as described above is not performed, but after printing the adhesive layer 9 on the magnetic substrate 8, the green sheet is brought into close contact with the base sheet to peel off the base film and then dried to produce an inductance. It has been confirmed that the same electrical characteristics as described above can be obtained for the parts.

(Embodiment 2) In this embodiment, a method of manufacturing a transformer having one primary coil and three secondary coils will be described. FIG. 5 is a cross-sectional view of the transformer according to this embodiment, in which 12 is a magnetic substrate, 13 is an adhesive layer, 14, 15, 1
6 and 17 are the first, second, third and fourth coils,
18 is an E-shaped core.

2A and 2C of the first embodiment, the printed patterns of two kinds of conductor layers having the same terminal electrode positions (designated as patterns A and B) and the first embodiment.
The printed patterns (patterns C, D, and 6) of the conductor layers in which the terminal electrodes are located at positions different from those shown in the embodiment of
E, F, G, and H), a total of eight types of printed patterns of conductor layers were used, and four types of green sheets having different terminal electrode positions were prepared in the same manner as in the first embodiment. here,
Printed pattern A and B, C and D, E and F, G and H of conductor layer
The coils formed by the first, second, third, and
The fourth coils 14, 15, 16 and 17 are used. Four kinds of green sheets having these coils were sequentially transferred by the same method as in the first embodiment to form four coils on the magnetic substrate 12. Then, the E-shaped core 18 was fixed to the magnetic substrate 12, the binder was removed, and the firing was performed in the same manner as in the first embodiment.

Using the second coil 15 of the transformer thus manufactured as the primary coil, the coupling coefficient with the first, third and fourth coils 14, 16 and 17 which are the secondary coils was measured by an LCR meter. Obtained from the results. as a result,
The coupling coefficient of the second coil 15 with the first coil 14 and the third coil 16 was 0.998, and the coupling coefficient with the fourth coil 17 was 0.999. As described above, the inductance component of this example had excellent transformer characteristics as a transformer.

[0023]

According to the present invention, a non-magnetic material layer similar to the above is further formed on a pair of conductor layers connected through a non-magnetic material layer having an electrically insulating property to form a through hole. By forming an inductance component having a pair of magnetic bodies that are in contact with each other through the through holes of the green sheet or that are separated from each other by a necessary gap, it is possible to obtain an Mn-Zn-based or Ni-Zn-based ferrite having excellent magnetic properties as a magnetic body. Since a sintered body can be used and most of the generated magnetic flux passes through the magnetic body, an inductance component having excellent electrical characteristics can be obtained. Further, since the structure is made by stacking the insulating layer and the conductor layer, it is possible to reduce the size and thickness of the components, and when used as a module, a small and thin module can be obtained. Furthermore, since the insulator layer, the conductor layer, and the magnetic body are all fired products, the inductance component has excellent heat resistance.

[Brief description of drawings]

FIG. 1A is a front sectional view of a green sheet according to a first embodiment of the present invention, and FIG. 1B is a plan view of the green sheet.

2A is a print pattern diagram of a first conductor layer in the first embodiment of the present invention, FIG. 2B is a print pattern diagram of the same first insulator layer, and FIG. 2C is a second conductor diagram thereof. Print pattern diagram of layer (d) is a print pattern diagram of the same second insulator layer

FIG. 3 is an exploded perspective view of an inductance component according to the first embodiment of the present invention.

FIG. 4 is a sectional view of the same inductance component.

FIG. 5 is a sectional view of a transformer according to a second embodiment of the present invention.

[Explanation of symbols]

 1 Base Film 2 1st Conductor Layer 3 1st Insulator Layer 4 2nd Conductor Layer 5 2nd Insulator Layer 6 Through Hole 7 Terminal Electrode 8 Magnetic Substrate 9 Adhesive Layer 10 Laminated Body 11 E-shaped Core

Claims (2)

[Claims] 1. A base film, a first insulator layer covering a first conductor layer printed on the base film, and a second conductor layer printed on the first insulator layer. A laminated body including a second insulator layer, one end of the first conductor layer and one end of the second conductor layer are connected to form one coil, and further, in a central portion of the laminated body. Green sheet for inductance parts with through holes. 2. A magnetic substrate, a laminated body formed by transferring the green sheet for inductance according to claim 1 onto the magnetic substrate and firing the magnetic sheet, and a magnetic body partly inserted into a through hole of the laminated body. Inductance parts consisting of the body.