JPH02177404A - In-phase type impedance element and manufacturing device therefor - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a high-performance and inexpensive common-mode impedance element that is surface-mounted on a substrate of electronic equipment, telecommunication equipment, etc., and an apparatus for manufacturing the same.

<Prior Art> Surface-mounted common-mode impedance elements are used in electronic devices, which can block electromagnetic interference generated by the device itself or received from the outside, and which can be easily attached to a board.

Conventional examples of this type of in-phase impedance element include multiple turns or one turn of a conducting wire around a magnetic core made of ferromagnetic material in which a closed magnetic path is formed.

Each is formed by processing the start and end terminals.

As another example, a magnetic thin film is produced by a printing method or a doctor blade method using a magnetic paste containing ferrite as a main component, and a plurality of layers are laminated and dried to form a magnetic plate. Here, multiple conductors with both ends protruding slightly from both end surfaces of the magnetic plate are printed on a part of the lower magnetic plate, and the magnetic plate is laminated again on top of this upper layer to create a raw impedance. An element is formed. Therefore, the two upper and lower magnetic plates are stacked to form a closed magnetic path with respect to the magnetic path generated by the current flowing through the conductor. The raw impedance element is sintered into one piece, and a terminal electrode is provided which is connected to both ends of the conductor and covers both end faces with a conductive material, thereby obtaining an in-phase impedance element.

<Problems to be solved by the invention> However, in conventional in-phase impedance elements using magnetic cores, the magnetic core has a large external shape and occupies a large proportion of the terminal processing portion of the winding conductor, making it difficult to miniaturize for surface mounting. I can't. Furthermore, in the conventional integrally sintered in-phase impedance element in which a conductor is sandwiched between two layers of upper and lower magnetic plates, characteristics such as impedance values can be maintained sufficiently in the desired frequency band and in the state of superimposed DC values. to get to.

It is necessary to ensure a sufficient magnetic path made up of magnetic plates.

In order to obtain a sufficient magnetic path, the thickness of each magnetic plate is usually 1
(2) It requires at least 0.5 m, and since it is made of a magnetic plate rather than a magnetic thin film, there are many steps of film formation, drying, and lamination, which makes it impossible to obtain an economical in-phase impedance element.

Further, in order to increase the withstand voltage between the plurality of conductors superimposed between the upper and lower two layers of magnetic plates, it is necessary to maintain a sufficient distance between the conductors. However, the reduction in the coupling coefficient between conductors has the disadvantage that it is not suitable for high-performance applications in which the normal mode component is reduced, such as in common mode coils.

In addition, in the case of printing a non-magnetic material between printed conductors to prevent a decrease in the coupling coefficient, the number of steps is further increased, and when a large number of elements are obtained by the printing method, individual elements are cut from a continuous element material. This method has the disadvantage that it is not possible to carry out the steps up to obtaining the impedance element in a consistent process, and that the cost is low.

Means for Solving the Problems> The present invention solves the above drawbacks of the conventional method and provides a magnetic material 4-4 containing magnetic powder that can be mixed and kneaded with a binding resin and a solvent.
Between the longitudinal centers of two magnetic plates extruded from a steel plate, between the longitudinal centers of two magnetic plates, and between a plurality of rod-shaped conductors extruded from a metal powder (-a conductor to which metal powder has been added)
After sintering a raw impedance element in which an insulator extruded from an insulating paste containing non-dielectric insulating material powder was laminated, a terminal electrode made of a conductive material was connected to the end of each conductor on the end surface of the cylinder. It is an in-phase impedance element, and these magnetic plates, insulators, and conductors are extruded from respective extrusion mechanisms and extrusion heads that house the respective magnetic bodies (-st, insulator 4-st, and conductor paste) and sent to the feed roller. It is transported by a transport mechanism such as
Finally, the apparatus for manufacturing an in-phase impedance element is provided with a crimping mechanism for crimping two superimposed and laminated magnetic plates by a second extrusion mechanism containing magnetic paste.

Function: Both the conductor and insulator are completely wrapped in magnetic material, so all the magnetic flux generated around the conductor when current is passed through the conductor is concentrated in the magnetic material and does not leak to the outside, and unnecessary magnetic flux from the outside is also absorbed. Do not let it get inside. Furthermore, these magnetic plates, conductors, and insulators are extruded and molded by respective extrusion mechanisms, and raw impedance elements are continuously produced in an integrated manner.

<Example> A first example of the in-phase impedance element according to the present invention is described below.
2 and 3.

FIG. 1 shows a first embodiment of the present invention, in which ferrite magnetic powder is bonded with a binding resin such as methyl cellulose.

A solvent is mixed and kneaded to form a magnetic paste, which is then extruded to form slightly thick magnetic plates 1, 1'.

Ag or Ag-Pd is placed on one of the magnetic plates 1.
A plurality of conductors 3.3' are formed by extruding a conductor paste made of a high melting point metal or a silver alloy from an extrusion head. Also, it does not cause thermal decomposition during sintering of alumina etc.9
An insulating paste made of a mixture of non-ferromagnetic and non-ferroelectric powder, a binding resin and a solvent is extruded between the conductors 3 and 3' to form a non-magnetic insulator 4. The other magnetic plate 1' is laminated on top of this to form a raw impedance element 6 in which the ends of the conductors 3, 3' and the insulator 4 are exposed at the center of both end faces as shown in b). The raw impedance element 6 is integrally sintered and connected to the respective conductors 3 and 3' exposed at both end faces, and is connected to a film-like terminal electrode 5 using a conductive material.
5', 5'' 5/// form a common-mode impedance element as shown in (c).

FIG. 2 shows a second embodiment of the present invention, in which a wide flat insulator 4 is molded with insulating paste on the central part of a magnetic plate 1 which is extruded into a magnetic material by one stroke.
Furthermore, a plurality of parallel conductors 3, 3' are superimposed on the top surface using conductor paste, and the magnetic plate 1 is again stacked on top of the conductors 3, 3'. Therefore, as shown in (b), a raw impedance element 6 is obtained in which the ends of the insulator 4 and the conductor 3.degree. 3' are exposed at the center of both end faces. The raw impedance element is sintered into one piece, connected to each conductor 3.3' on both end faces, and covered with a film-like terminal electrode 5.5', 5" 5/// of a conductive material (C) A common-mode impedance element like this is obtained.

FIG. 3 shows a third embodiment of the present invention, in which a magnetic plate 1,
An insulator 4 is stacked all over the center part except for both sides of 1', and eight bar-shaped conductors 3 as shown in this example are placed on top of it in parallel, and a magnetic plate 1' is stacked and fixed on top of it. After integral sintering,
As shown in (b), a terminal electrode 5 is provided on each conductor 3 to obtain a common-mode impedance element.

As described above, in both the in-phase type in-dance elements according to the present invention, the non-magnetic insulator 4 and the conductor 3 are wrapped in the magnetic plates 1 and 1', and magnetic flux is generated by the current flowing through each conductor 3. Since all of the magnetic fluxes are concentrated in the magnetic path formed by the two magnetic plates 1 and 1', the coupling coefficient takes a high value.

Still magnetic plate 1. Insulator 4. Since the conductor 3 is all extruded by an extrusion head, the desired thickness is always maintained, and the entire process from film forming to cutting can be performed consistently.

FIGS. 4 and 5 show a manufacturing apparatus used for manufacturing a common-mode impedance element according to the present invention.

In FIG. 4, it is used to generate the raw impedance element shown in FIG. The plate 1 is extruded, shaped, and conveyed by a conveyance mechanism such as a feed roller 8. Further, a continuous layer of the insulator 4 is pushed onto the magnetic plate 1 by the push head 7 from the insulator extrusion mechanism 11 in which the insulator 4-st is housed.
are stacked on top of each other and transported. Next, a plurality of consecutive conductors 3.37, 3// are simultaneously extruded and conveyed onto the insulator 4 by the extrusion head 7 from the conductor extrusion mechanism 12 containing the conductor paste.

Finally, the magnetic material plate 1' continuously pushed out by the magnetic material extrusion head 7 from the second magnetic material extrusion mechanism 10' in which the magnetic material 4-st is stored is transferred to the second feed roller 8'.
The upper and lower magnetic plates 1, 1' are conveyed by a conveying mechanism such as a conveyor, and are laminated on top of the conductor 3.
Pressure is applied between them to form a continuous in-phase raw impedance element 6.

In addition, in FIG. 5, an insulator extrusion mechanism 11 and a conductor extrusion machine 12 are integrated in the position of the insulator extrusion mechanism 11 in FIG. The insulators 4 and conductors 3 are alternately arranged in the width direction by the extrusion head 7 in which respective discharge holes are arranged alternately, and are superimposed on the magnetic material plate 1 that has already been continuously produced. Further, a second magnetic plate 1' continuously produced by a second magnetic body mechanism 10' extrusion head is superimposed on this, and is pressed by a pressure mechanism such as a pressure roller 9. A continuous in-phase raw impedance element is formed.

Note that the extrusion head 7 in these manufacturing devices, like a mold or a nozzle, has a uniform thickness of the desired magnetic shape, and can be processed from the material to the raw inductance element 6 in one integrated process, unlike the conventional stacking process. .

The third embodiment shown in FIG. 3 also achieves this goal.

<Effects of the Invention> As described above, according to the present invention, the non-magnetic insulator 4 is interposed between the conductors 3 provided inside the magnetic plate 1,
These conductors3. Since the insulator 4 is entirely wrapped in a magnetic material, all the magnetic paths generated by the current flowing through the conductor 3 are concentrated in the magnetic material, resulting in a common-mode impedance element with a high coupling coefficient.

Also, magnetic plate 1. Conductor 3. Since both insulator 4 and insulator 4 are produced by one continuous extrusion molding, the

[Brief explanation of the drawing]

FIG. 1 is a perspective view of the first embodiment of the in-phase impedance element of the present invention, (&) is an exploded external perspective view of the raw impedance element, and (b) is a raw impedance (external external perspective view of the Slith element). 2 is a perspective view of an in-phase impedance element in which terminal electrodes are provided on both end faces of the raw impedance element, FIG. 2 is a perspective view of a second embodiment of the present invention, and (a) is an exploded perspective view of the raw impedance element. figure,(
b) is an external perspective view of a raw impedance element, (C) is an external perspective view of an in-phase impedance element in which terminal electrodes are provided on both end faces of the raw impedance element, and Fig. 3 is a perspective view of a third embodiment according to the present invention. In the figures, (a) is an external perspective view of a raw impedance element, (b) is an external perspective view of a raw impedance element with terminal electrodes provided on both end faces, and Figure 4 is a perspective view of the raw impedance element according to the present invention. FIG. 2 is a schematic perspective view showing the structure of a manufacturing apparatus in which a continuum of similar raw impedance elements is formed. Note that 1.1': magnetic plate, 3.3', 3'': conductor, 4: insulator 5, 5/, 5/Z 5///; terminal electrode, 6: raw impedance element, 7: extrusion head , 8
．． 8': feed roller, 9: pressure roller, 10.10',
111.2 No.: Extrusion mechanism.

Claims (2)

[Claims] 1. Between the longitudinal centers of the two magnetic plates 1 and 1', which are made from a magnetic paste containing magnetic powder, which is mixed and kneaded with a binding resin and a solvent, and from a conductive paste containing metallic powder. A plurality of rod-shaped conductors 3, 3
A raw impedance element 6 in which an insulator 4 made of an insulator paste containing non-magnetic, non-dielectric insulating material powder is extruded and laminated is sintered, and the conductor 3, A common-mode impedance element in which terminal electrodes 5, 5', 5'', and 5'' made of a conductive material are connected to each end of 3'. 2. An extrusion mechanism 10 that stores magnetic paste and extrudes the magnetic plate 1 from the extrusion head 7, an extrusion mechanism 11 that stores the insulating paste and extrudes the insulator 4 from the extrusion head 7, and an extrusion head 7 that stores the conductive paste. It consists of an extrusion mechanism 12 for extruding a plurality of conductors 3, 3', 3'', and a second extrusion mechanism 10' for storing the magnetic paste, and each extrusion mechanism 10, 10', 11, 1. An in-phase impedance element manufacturing apparatus comprising a conveyance mechanism for conveying the members extruded from each of 12 and a pressure mechanism for press-bonding two magnetic plates 1 and 1'.