JPH02155206A - Impedance element or in-phase type impedance element and production device thereof - Google Patents

Abstract

PURPOSE:To obtain a low-cost impedance element or in-phase type impedance element having large reliability by inserting magnetic paste and conductor paste into an extrusion molding head and acquiring the continuum of a green ferrite magnetic substance through extrusion molding. CONSTITUTION:Magnetic paste, in which a bonding resin and a solvent are mixed and kneaded with ferrite magnetic powder, and conductor paste in which the bonding resin and the solvent are mixed and kneaded with a high melting- point metal such as Ag or the powder of an alloy are formed. In a extrusion molding head 7 in which a cylindrical internal frame 6 is installed at the central section of a cylindrical external frame 5 having a rectangular cross section, the continuum of a green ferrite magnetic substance 4 in which a conductor 21 extruded from the internal frame 6 is penetrated to the center of a ferrite green thick board 1 shaped by extruding magnetic paste from a section between the external frame 5 and the internal frame 6 is formed. Accordingly, the green ferrite magnetic substance 4, which is cut in desired length and exposed from a center of which the conductor 21 consisting of conductor paste is exposed, is acquired.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention is directed to f+) for preventing electromagnetic interference in electronic equipment.
The present invention relates to an impedance element or in-phase impedance element that can be surface mounted on a component wiring board, etc., and an apparatus for manufacturing the same.

<Conventional technology> Conventionally, impedance elements that are surface-mounted on printed wiring boards to prevent electromagnetic interference in electronic devices are formed by mixing and kneading magnetic powder such as ferrite, binder phase, fat, solvent, etc. A raw ferrite board is formed by forming a magnetic film by a printing method or a doctor blade method, dry laminating, or extrusion molding.A conductor pattern is printed or extruded and laminated on this raw ferrite board.

The raw ferrite plates are superimposed and fixed by pressing or rolling so as to create a closed magnetic path in response to the magnetic field generated by the current flowing through the conductor. This is integrally sintered, electrically connected to a conductor pattern, and the end face covered with a conductor and provided with an electrode terminal.

<Problems to be Solved by the Invention> However, in order to obtain a sufficient impedance value in a desired frequency band and high DC superimposition characteristics in a general impedance element, it is necessary to secure a sufficient magnetic path. However, the thickness of the raw ferrite plate of conventional impedance elements is usually 0.
．． Approximately 5 to 1 coat of paper is required, but when it is formed by a printing method using magnetic paste, the printing and drying process or time required is 1 more or less. , Ta1,, Death 7-4. When the film is formed by this method, the thickness of the film is only about several tens of microns, which has the drawback of requiring a large number of lamination steps.

Furthermore, even during the extrusion process using an extrusion molding machine with an improved lamination process, it was not possible to superimpose and fix at least two membranes, and even when it was an integrated process, it was difficult to obtain sufficient adhesion and integration. There was a problem that it was economically difficult to bury the pipes.

Means for Solving the Problems> The present invention solves the above drawbacks of the conventional technology by adding metal or alloy powder to the center of a raw ferrite plate with a rectangular cross section, which is made of a magnetic paste made by mixing and kneading ferrite magnetic powder with a binding resin and a solvent. A ferrite magnetic material formed by extruding and molding one or more columnar conductors made of a conductor waveform made by mixing and kneading a bonding resin and a solvent is integrally sintered, and conductors are attached to both end surfaces. These are an impedance element provided with an electrode terminal made of a conductive material connected to an in-phase impedance element.

In addition, these ferrite magnetic materials are extrusion molded with a plurality of inner frames in which conductive yeast is press-fitted inside and simultaneously extruded under pressure at the center of an outer frame into which magnetic yeast is press-fitted and extruded under pressure. The ferrite magnetic material is integrally molded by the head. Also, a feeding mechanism that continuously conveys the integrally molded ferrite magnetic material by a ferrite extrusion mechanism that supplies and pressurizes the magnetic paste provided on the extrusion molding head, and a conductor extrusion mechanism that supplies and pressurizes the conductive paste.

This is an apparatus for manufacturing an impedance element or an in-phase impedance element, which is provided with a drying mechanism provided thereon and a cutting mechanism that cuts a continuous ferrite magnetic material.

<Function> The magnetic paste and conductor paste extruded from the extrusion molding head form a continuous body on the outer periphery in which a conductor is penetrated into the center of a raw ferrite plate, and this is cut to obtain a ferrite magnetic body.

<Example> Impedance elements of the impedance element and common-mode impedance element of the present invention are shown in FIGS. 1, 2, and 3.

As shown in the drawings, a magnetic paste is prepared by mixing and kneading a binding resin and a solvent with ferrite magnetic powder, and a conductor paste is formed by mixing and kneading a binding resin and a solvent with a powder of a high melting point metal such as Ag or an alloy. This kneaded paste is simultaneously extruded under pressure to form a continuous body of ferrite magnetic material, which is passed through the conductor 21 formed in the shape of one column at the center K of the thick ferrite plate l formed with a rectangular cross section. Form. This is cut into a desired length as shown in FIG. 2 to obtain a ferrite magnetic body 4 in which a conductor 21 made of conductive paste is exposed at the center. After sintering this ferrite magnetic material 4, as shown in FIG.
2 is covered with a metal material such as baking or plating to obtain an impedance element for surface mounting.

Further, embodiments of the common-mode impedance element according to the present invention are shown in FIGS. 4, 5, and 6.

As shown in the drawing, a plurality of columnar conductors 21, 22, and 23 made of conductive paste were passed through the center of a thick ferrite plate 1 made of magnetic yeast and had a rectangular cross section, and cut to a desired length by 9J. A ferrite magnetic material 4 is obtained as shown in FIG. After the ferrite magnetic material 4 is integrally sintered, conductors 21 and 22 are exposed on both end faces as shown in FIG.
．． 23 are provided with lead-out electrode terminals 31, 32, 33, 34, 35, 36, respectively, to form a common-mode impedance element for surface mounting. Therefore, the one or more conductors 31, 32, 33, 34°35.36 form a closed magnetic path for the current flowing through them.

In addition, the ferrite magnetic material 4 for impedance elements and in-phase impedance elements can be integrated and formed continuously in one extrusion process, so it is possible to form several dozen
This is a significant simplification compared to printing methods, doctor blades, or extrusion molding methods with overlapping sympathic processes, where sufficient thickness cannot be obtained even with multiple laminations. Moreover, even in the case of one or more conductors 31, 32, 33, 34, 35, 36, the integrated process is carried out continuously.

An inexpensive impedance element and common-mode impedance element can be obtained through a simple process.

An embodiment of an extrusion head used in forming this type of impedance element of the present invention is shown in FIG.

As shown in the drawings, in an extrusion molding head 7, a cylindrical inner frame 6 is provided at the center of a cylindrical outer frame 5 with a rectangular cross section.
At the same time, a continuous body of ferrite magnetic material 4 is formed, in which a conductor 21 extruded from the inner frame 6 is penetrated into the center of the ferrite raw thick plate 1, which is magnetically extruded from between the outer frame 5 and the inner frame 6. be done.

Therefore, since the extrusion molding head 7 is used, it is possible to continuously produce a large number of impedance elements, and the required man-hours can be greatly reduced, so that the impedance element can be formed economically. Also, inner frame 6
When the Rad 7 is used for multi-type extrusion molding in which a plurality of impedance elements are provided, an in-phase impedance element is formed.

Moreover, as shown in FIG. 8, a multi-type extrusion molding head 7
A ferrite extrusion mechanism 8 for supplying magnetic paste and a conductor extrusion mechanism 9 for supplying conductor paste are provided.

Further, the continuous body of the ferrite magnetic material 4 extruded to the front surface of the multiple extrusion molding head 7 is fed by a feeding mechanism 11 provided with a drying mechanism 1O, and cut by the cutting IFrUA mechanism 12. is obtained.

Therefore, a continuum is formed in one extrusion molding,
- An apparatus for manufacturing an impedance element or an in-phase impedance element that is easy to manufacture and inexpensive through a continuous continuous process is constructed.

<Effects of the Invention> As described above, by inserting one magnetic stroke and one conductive stroke into the extrusion molding head 7, a continuous body of ferrite magnetic material 4 is formed by extrusion molding. 41, an inexpensive and highly reliable impedance element or common-mode impedance element can be obtained.

[Brief explanation of the drawing]

FIG. 1 is an external perspective view of an embodiment of the impedance element of the present invention, (a) is an external perspective view of a ferrite thick plate, (b) is an external perspective view of a conductor, and FIG. 2 is a conversion according to FIG. 1. FIG. 3 is an external perspective view of a ferrite magnetic material, FIG. 3 is an external perspective view of an impedance element in which termination terminals are provided on both end faces of the ferrite magnetic material in FIG. 2, and FIG. 4 is an implementation of an in-phase impedance element according to the present invention. 5 is an external perspective view of the ferrite magnetic material according to FIG. 4, and FIG. 6 is an external perspective view of the ferrite magnetic material according to FIG. 4. 7 is an external perspective view of the in-phase impedance element in which electrode terminals are connected to the respective conductors on both end faces of the ferrite magnetic material shown in FIG.
The figures show the extrusion molding head used in the present invention; (a) is an external perspective view, (b) is a longitudinal side view passing through the center, and Fig. 8 is a series of ferrite magnetic materials using the extrusion molding head according to the present invention. 1 is an external perspective view showing the principle of a manufacturing device for molding a body. In addition, 1: ferrite raw thick plate, 21, 22, 23: conductor, 31, 32, 33, 34, 35, 36: electrode terminal, 4
: Raw ferrite magnetic material, 5: Outer frame. 6: Inner frame, 7: Extrusion molding head, 8: Ferrite extrusion mechanism, 9: Conductor extrusion mechanism, 10: Drying mechanism,
11: feeding mechanism, 12: cutting mechanism. Figure 2 Figure 3 Figure 45! ! Flute 5 figure 6 figure

Claims (3)

[Claims] 1. One or more columnar conductors 21 made of a conductor paste made of a metal material mixed with a binding resin and a solvent are placed in the center of a thick ferrite plate 1 made of a magnetic paste made by mixing and kneading a ferrite magnetic material with a binding resin and a solvent. ,22
, 23 are integrally penetrated and extruded, the raw ferrite magnetic body 4 is sintered, and the electrode terminals 31, 32 are made of a conductive material and connected to the conductors 21, 22, 23 on both end faces.
, 33, 34, 35, 36. 2. The extrusion molding head 7 is provided with a plurality of inner frames 6 into which the conductive paste is inserted and simultaneously extruded under pressure at the center of an outer frame 5 into which the magnetic paste is inserted and extruded under pressure. An apparatus for manufacturing an impedance element or an in-phase impedance element that integrally molds a raw ferrite magnetic material 4. 3. A raw ferrite magnetic body 4 is continuously integrally molded by a ferrite extrusion mechanism 8 provided in the extrusion molding head 7 for supplying and pressurizing the magnetic paste, and a conductor extrusion mechanism 9 for supplying and pressurizing the conductor paste.
An apparatus for manufacturing an impedance element or an in-phase impedance element according to claim 2, comprising a drying mechanism 10 for drying on a feeding mechanism 11 for conveying the continuous body, and a cutting mechanism 12 for cutting the continuous body.