JPH0456108A - Inductance part and its preparation - Google Patents

Abstract

PURPOSE:To reduce production cost of an inductance part and to enhance the magnetic property of the inductance part over a high frequency range by laminating mixed layers of an insulating layer, dielectric layer or non-magnetic layer, and ferrite magnetic layer concentrically or into a roll. CONSTITUTION:Ferrite magnetic layer 1 and insulating layer 2 form a cylindrical magnetic member 4. The outer surface of this magnetic member 14 is wound round with coil 3. With such structure, even when the operating frequency is increased, the inductance part maintains the same characteristics as those obtained at a low frequency. Even when the insulating layer 2 is replaced with a dielectric layer, non-magnetic layer, or further by a mixed layer of these, the result is the same. As stated above, since the inductance part has a structure such that more than one type of layer out of the insulating layer, dielectric layer or non-magnetic layer and ferrite layer are laminated concentrically or to form a roll, various magnetic characteristics are superior in frequency characteristic. In particular, this magnetic member for inductance part is suitable for operation in high frequency range where various magnetic characteristics such as magnetic permeability are maintained.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an inductance component suitable for operation at high frequencies, and particularly to an inductance component with good frequency characteristics and a method for manufacturing the same.

BACKGROUND OF THE INVENTION Ferrite is a magnetic material often used in conventional inductance components. Ferrite is widely used in inductance components such as coils and transformers for communication equipment and consumer equipment, but in recent years, the operating frequency has been increasing, and inductance components with sufficient performance to be used at high frequencies are becoming more and more popular. requested.

Up to now, the type or composition of ferrite has been used appropriately, such as using NiZn thread ferraferrite for inductance parts operated in a high frequency region, and MnZn-based ferrite when the operating frequency force S is relatively low. Although MnZn-based ferrite has a high initial magnetic permeability, it has problems in the high frequency range. In addition, various measures have been proposed to improve these problems, such as adding various elements.

For example, improvement of the Q of Zn-based ferrite (as shown in Japanese Patent Application Laid-Open No. 63-260006) or
There is an improvement in magnetic permeability in a high frequency region as shown in Japanese Patent Application No. 0-16863.

Problems to be Solved by the Invention As mentioned above, various improvements in frequency characteristics that can be used sufficiently even in high frequency regions have been proposed, but they are still insufficient, and therefore, it is difficult to operate at high frequencies. There were major issues regarding application to various electronic components, etc.

The present invention aims to eliminate the above-mentioned conventional drawbacks and provide an inductance component that maintains sufficient characteristics at high frequencies. In order to achieve this, the present invention provides a structure in which at least one of an insulating layer, a dielectric layer, a non-magnetic layer, or a mixture thereof and a ferrite magnetic layer are laminated in a concentric or spiral shape. A coil is attached to the magnetic material to create an inductance component.

Function: By forming an inductance component with the above-described structure, a layer of at least one of an insulating layer, a dielectric layer, a non-magnetic layer, or a mixture thereof and a ferrite magnetic layer can be formed in concentric circles or glued together. By creating an inductance component that is constructed by installing a coil in a magnetic material layered in a spiral shape, each ferrite magnetic layer can be magnetically separated by the layer described above, resulting in cost savings that could not be achieved with conventional inductance components. can be reduced and the magnetic properties in the high frequency region improved.

Example Examples of the present invention will be described below.

The inductance component of the present invention has at least one of an insulating layer, a dielectric layer, a non-magnetic layer, or a mixture thereof and a ferrite magnetic layer laminated in a concentric spiral shape. This is an inductance component constructed by installing a coil on a magnetic material. The insulator layer is a layer mainly made of an insulator, and the same applies to the dielectric layer and the nonmagnetic layer. Furthermore, a layer formed from a mixture of these may be used. FIG. 1 shows a schematic diagram of an example of an inductance component of the present invention. FIG. 1 shows an example of an inductance component using a cylindrical magnetic body. 1 is a ferrite magnetic layer, 2 is an insulating layer, and these form a cylindrical magnetic body 4. 3 is a coil wound around the outer periphery of this magnetic body 4. FIGS. 2 and 3 are partially enlarged views showing an example of lamination of the magnetic material 4 shown in FIG. 1, and for the sake of clarity, the magnetic material is shown in a planar shape. In FIG. 2, there are three ferrite magnetic layers 1, and in FIG. 3, there are two ferrite magnetic layers 1. 6 is a nonmagnetic layer. Second
As shown in the figure, the ferrite magnetic layer 1 of the magnetic material 4 constituting the inductance component of the present invention has a laminated structure with an insulating layer 2 interposed therebetween.

With such a structure, even if the operating frequency is increased, the inductance component maintains the same characteristics as at a low frequency. The same effect can be obtained by replacing the insulating layer 2 shown in FIG. 2 with a dielectric layer, a nonmagnetic layer, or a layer of a mixture thereof.

The magnetic material 6 used in the inductance component of the present invention shown in FIG. 3 has a structure in which a layer having good matching with the ferrite magnetic layer 1 is brought into contact with the ferrite magnetic layer 1, and another layer is provided in between. In the case of FIG. 3, a non-magnetic layer 6 is used as a layer with good matching, and an insulating layer 2 is used as a layer therebetween. In this way, FIG. 3 shows a magnetic material 4 having a structure in which three types of layers are laminated.

The ferrite magnetic layer 1 may be made of MnZn ferrite, NiZn ferrite, or other spinel-type ferrites, which are commonly used in inductance parts, or a mixture thereof.

The material for forming the insulator layer 2 is alumina (mu-12).
03), mullite (3M1205.2SiO2), beryllia (BeO), steatite (MgO-8iO2),
Various ceramics such as forsterite (2MgO・5in2), magnesia (MgO), titania (TiO2), titania + zirconia (ZrO2), titania + magnesia, etc. -8in2-B203. Mu12
03-PbO-3in2・B2O3, Mu1205-Mg
0-5iO2B203. Mu7120. -CaO-MgO
Examples include glass ceramics such as -5in□-B203, various types of materials, combs, oils, nitrides, carbides, etc.

Materials for forming the dielectric layer include those included in the above-mentioned insulators, norium titanate, potassium niobate, and the like.

Materials for forming the non-magnetic layer 6 include zinc ferrite, which is a spinel type ferrite magnetic layer, α-Fe, etc.
03 etc. As described above, there are many substances that cannot be clearly classified into insulators, dielectrics, and nonmagnetic substances, but belong to two or more. As mentioned above, the above three layers do not necessarily have to be made of one material, but may be made of a mixture of various materials.

In this way, since it has a structure in which one or more of an insulating layer, an N-electric layer, or a non-magnetic layer and a ferrite magnetic layer are laminated in a concentric or spiral shape, the frequency of various magnetic characteristics can be varied. Good LfW properties. It is a magnetic material for inductance parts that exhibits its power particularly in the high frequency range where various properties such as magnetic permeability are maintained even at high frequencies. Furthermore, the magnetic material constituting the inductance component of the present invention is made of a very inexpensive material and can be obtained by a highly productive method as described below.

Next, several examples of methods for manufacturing the inductance component of the present invention will be described.

Ferrite powder and solvents such as butyl calpitol, terpineol, alcohol, and ethyl cellulose. Binders such as polyvinyl butyral, polyvinyl alcohol lv, polyethylene oxide, ethylene-vinyl acetate, etc., as well as sintering aids such as oxides or glasses, and plasticizers such as butylbenzyl phthalate, dibutyl phthalate, glycerin, etc. may be added. A magnetic sheet is produced by forming a kneaded mixture of these into a sheet shape. Similarly, an insulating sheet is produced by forming a kneaded mixture of insulating powder, a binder, and a solvent into a sheet shape. A laminate is produced by laminating the insulating sheet and the magnetic sheet in a concentric or multi-wound configuration. Alternatively, after laminating them in a plane, the laminated body is formed into a concentric circular shape.

Next, a magnetic material is formed by high-temperature treatment at a predetermined temperature.

This is a method of providing a coil on this magnetic material.

The second method is to knead the magnetic sheet obtained in the above method with insulating powder, a binder, and a solvent, apply this kneaded material to the magnetic sheet, and then form the magnetic sheet into a concentric or spiral shape. Stack them like this. Next, a magnetic material is formed by high-temperature treatment at a predetermined temperature. This is a method of providing a coil on this magnetic material.

Although the above example shows a case where an insulator is used, a dielectric material, a nonmagnetic material, or a mixture thereof may be used instead of an insulator. Furthermore, instead of these single-layer structures, a multi-layer structure as shown in FIG. 3 may be used.

Methods for manufacturing the coil of the inductance component of the present invention include a method in which a bobbin with a wire wound thereon is mounted on the magnetic body 4, or a method in which the entire surface of the magnetic body 4 is insulated and a coil is formed directly on the magnetic body 4. be. Further, when winding the wire directly around the magnetic body 4, the wire may be wrapped in a wrapping shape instead of a cylindrical shape to facilitate winding.

Next, more specific embodiments of the present invention will be described.

Example 1 Mn0 3011047%, ZnO1sao1%, Fe
2O.

After holding the powder mixed with 61m01% in the air at AOO'C for 2 hours, it was pre-calcined by cooling in nitrogen.

This powder was crushed and classified to produce MnZn with an average particle size of 3 μm.
A ferrite powder was prepared.

Next, 10 g of a mixture of butyl calpitol, ethyl cellulose, and glutyl benzyl phthalate in a weight ratio of 20:1:2 was mixed with 30 g of the MnZn-based ferrite powder prepared earlier, and kneaded into a paste. I made something. A magnetic sheet having 100 layers and a thickness of 1 m was prepared from this kneaded material using a doctor blade method. Similarly, terpineol.

A mixture of ethyl cellulose and butyl benzyl phthalate in a weight ratio of 20:1:1 was prepared by mixing 7 to 10
g and glass powder (powder composition is B20523wt%, 51
0244wt%, ZnO16wt%.

A paste-like kneaded product was prepared by mixing 30 g of BaOswt% (average particle size: 1 μII). A glass sheet with a thickness of 10 μm was prepared from this kneaded product using a doctor blade method. This magnetic sheet and a glass sheet were stacked and rolled into a roll so that there were 10 layers of magnetic sheets. This laminate was subjected to high-temperature treatment at 1000° C. for 1 hour in a nitrogen atmosphere.

A coil was wound around this high temperature treated product and the frequency characteristics of magnetic permeability and relative loss coefficient were measured using an impedance analyzer. The magnetic permeability extends almost flat up to 7MHz.
The relative loss factor extends to high frequencies as well. The inductance component of the present invention was a magnetic material that had sufficiently high characteristics even at high frequencies.

Instead of glass powder, sheets were prepared in the same way using titanium oxide powder, barium titanate powder, zinc ferrite powder, and aluminum oxide powder, treated at high temperature, and measured for magnetic permeability and relative loss coefficient. However, the value was similar to that of glass.

Example 2 10 g of a mixture of terpineol, polyvinyl butyral and butylbenzyl phthalate in a weight ratio of 20:1:2 and Ni prepared in the same manner as in Example 1
Zn-based ferrite powder (powder composition is NiO2omo1%
, Zn030110A'%, Fe2Fe2056o%,
(average particle size: 3 μm) were mixed to prepare a paste-like kneaded product. A magnetic notebook with a thickness of 80 μm was prepared from this kneaded product using the doctor grade method. Similarly, 10 g of a mixture of terpineol, polyvinyl butyral, and dibutyl phthalate in a 3ti ratio of 20:1:2 was mixed with 10 g of glass powder (powder composition was 60 mog% PbO).
, B20B2O31o%, Mu/! 20520m01%,
(average particle size: 1 μm') were mixed to prepare a paste-like kneaded product. A glass sheet with a thickness of 8 μl was prepared from this kneaded product using a doctor grade method. The magnetic sheets and glass sheets were alternately laminated and wound into a υ-wound shape until the magnetic sheets had 10 layers.

This laminate was subjected to high temperature treatment by holding it at 1000° C. for 1 hour in the atmosphere.

When the magnetic permeability and relative loss coefficient of the obtained high-temperature treated product were measured in the same manner as in Example 1, the magnetic permeability was extended to 8 MHz, and the relative loss coefficient was similarly extended to high frequencies. The inductance component of the present invention had characteristics that could be used satisfactorily even at high frequencies.

Example 3 10 g of a mixture of butyl calpitol and ethyl cellulose at a weight ratio of 20:1 and crow powder (powder composition: B2O52 awt%).

510244wt%, ZnO1ewt%, BaOswt
%.

(average particle size: 1 μm) were mixed to prepare a paste-like kneaded product. The kneaded material was applied to the magnetic sheet prepared in Example 1, and the magnetic sheet was rolled in a cylindrical shape until 10 layers were formed. This laminate was heated at 1200°C in nitrogen for 1
Treated at high temperature and kept for an hour.

When the magnetic permeability and relative loss coefficient of the obtained high-temperature treated product were measured in the same manner as before, the magnetic permeability extended almost flatly up to 7 MHz, and the relative loss coefficient similarly extended to the high frequency range. The inductance component of the present invention was a magnetic material that exhibited very high characteristics even at high frequencies.

Instead of glass powder, a base was made in the same way using titanium oxide powder, barium titanate powder, zinc ferrite powder, and aluminum oxide powder, and after coating it on a magnetic sheet, it was rolled into multiple rolls. When the magnetic permeability and relative loss coefficient were measured after high-temperature treatment, the values were similar to those of glass.

Example 4 10 g of a mixture of butyl calpitol and ethyl cellulose in a weight ratio of 20=1 and glass powder (powder composition: B 20 s 18 ” t %).

SiO□49wt%, ZnO16wt%, BaO8wt
%.

(average particle size: 1 μm) were mixed to prepare a paste-like kneaded product. The kneaded material was applied to the magnetic sheet prepared in Example 2, and the magnetic sheet was wound in a pastry shape until the magnetic sheet had 10 layers. This laminate was heated at 1200°C in the atmosphere for 1
Treated at high temperature and kept for an hour.

When the magnetic permeability and relative loss coefficient of the obtained high-temperature treated product were measured in the same manner as before, the magnetic permeability extended to aMHz, and the relative loss coefficient similarly extended to high frequencies. The inductance component of the present invention has high characteristics that can be used satisfactorily even at high frequencies.

Pastes were made in the same way using titanium oxide powder, barium titanate powder, zinc ferrite powder, and aluminum oxide powder instead of glass powder, treated at high temperature, and the magnetic permeability and relative loss coefficient were measured. The value was similar to that of glass.

Effects of the Invention As described above, the inductance component of the present invention includes a layer formed of at least one of an insulating layer, a dielectric layer, a nonmagnetic layer, or a mixture thereof, and a ferrite magnetic layer. It has a structure in which a coil is provided on a magnetic material laminated in a concentric circle or in a multi-turn shape, and it is an inductance component with extremely good frequency characteristics that maintains various magnetic properties even in the high frequency range. As a result, an inductance component that can be operated at a high frequency regardless of the type of ferrite and is fully applicable to various electronic components is realized.

Furthermore, the present invention provides a method for obtaining an inductance component having such excellent characteristics.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing the structure of a typical inductance component of the present invention, and FIGS. 2 and 3 are front views showing the laminated structure of the magnetic material portion of the inductance component of the present invention. 1... Ferrite magnetic layer, 2... Insulator layer, 3... Coil, 4... Magnetic material,
6...Nonmagnetic layer. Name of agent: Patent attorney Shigetaka Awano and 1 other person 1st
figure!・ ・Ferrite Ishiku = +'*H Industry 2 diagram!・ , Ferrite Ishigame 7υ1 Fig. 3 1・ Ferrite Ishio I・1 Tang 2... Shaved Ilj Original Counterfeit

Claims (3)

[Claims] (1) A magnetic material consisting of a ferrite magnetic layer, an insulator layer, a dielectric layer, a non-magnetic layer, or a mixture of these layers laminated in a concentric or spiral shape, and a coil An inductance component configured by providing. (2) An insulator sheet made of a kneaded mixture of insulating powder, a binder, and a solvent, a dielectric sheet made of a kneaded mixture of dielectric powder, a binder, and a solvent, and a dielectric sheet made of a kneaded mixture of insulating powder, a binder, and a solvent. A non-magnetic sheet made of a kneaded mixture of magnetic powder, a binder and a solvent, or a mixture sheet made of a kneaded mixture of these powders, a binder and a solvent. A magnetic sheet made by mixing at least one type of sheet with ferrite powder, a binder, and a solvent is formed into a sheet, and the magnetic sheets are laminated in a concentric or spiral shape, and then a coil is formed on the magnetic body formed by high temperature treatment. A manufacturing method for inductance parts that provides (3) A kneaded mixture of ferrite powder, a binder, and a solvent was formed into a sheet, and a powder containing at least one of insulating powder, dielectric powder, and nonmagnetic powder, a binder, and a solvent were mixed. A method for manufacturing inductance parts in which a kneaded material is applied to a magnetic sheet, laminated in a concentric or spiral shape, and then subjected to high temperature treatment and a coil is attached to the formed magnetic material.