JPS63226904A - Inductance element and its manufacture - Google Patents

Abstract

PURPOSE:To obtain the title element whose mass productivity is high and where high inductance is realized even in a small size by a method wherein a continuous formed body where a magnetic-substance layer and a conductor are arranged in parallel is wound spirally and then sintered. CONSTITUTION:A long formed body A where a magnetic-substance layer 2 and a conductor 1 are arranged in parallel is wound spirally and then sintered. For example, a round-rod-like continuous formed body A composed of a magnetic-substance layer 2 containing a wire-like conductor 1 in its center is extruded continuously by using an extruder; the long formed body is wound spirally on a round-rod-like core before the extruded body is hardened immediately after the extrusion; the formed body is cut to an apprpriate length. The cut body is sintered in a sintering furnace after that, metal terminals 17 are attached to exposed end faces of the conductor 1 and are connected electrically to the conductor 1 by a soldering process or the like so as to form an inductance device 18 as a product. Pt, Pd, Ag-Pd or the like is used for said conductor 1; the magnetic-substance layer 2 is formed by using a material obtained by mixing a pulverized ceramic magnetic substance with a binder, or the like.

Description

DETAILED DESCRIPTION OF THE INVENTION <Field of Industrial Application> The present invention relates to an inductance element used in various electronic circuits and a method for manufacturing the same.

<Prior Art> Conventional cylindrical inductance elements include stripline type and @line type.

<Problems to be Solved by the Invention> Among the conventional cylindrical inductance elements as described above, the strip line type has a small L.

In addition, the wire-wound type has problems such as a lack of mass productivity.

Means for Solving the Problems> The present invention was made to solve the above problems, and involves spirally winding a long molded body in which a magnetic layer and a conductor are arranged in parallel. , provides a sintered inductance element and a method for manufacturing the same.

<Example> The drawing shows an example of the present invention, in which a round bar-shaped elongated molded body A consisting of a magnetic layer 2 having a linear conductor 1 at the center as shown in FIG. It is continuously extruded by extrusion IB and C as shown in FIGS. 2 and 3.

The extrusion 41B shown in FIG.
, an extrusion lower is provided in the front part of the main body 5, and a screw 8 is provided in the main body 1! In the center thereof, an insertion hole 9 for inserting a metal wire as the conductor 1 is provided.

Further, the rear end of the screw 8 is made to protrude to the rear of the main body 5,
A gear 10 is provided in this portion, and the screw 8 is driven by a drive device (not shown).

In the case of the above embodiment, a material 11 such as a mixture of ceramic magnetic powder or the like and a binder is put into the hopper 6, the screw 8 is rotated to extrude the material 11 from the extrusion lower, and the material 11 is inserted through the insertion hole 9. When a conductor 1 made of a metal wire is advanced at a circumferential speed, something like the one shown in FIG. 1 is obtained.

The metal material used as the conductor 1 includes a circle, a circle,
~-~ etc. are used. In the extruder C shown in FIG. 3, another hopper 12 is provided at the rear of the main body 5, and the tip of a cylindrical body 13 communicated with the lower end of this hopper 12 is inserted into the insertion hole 9 of the screw 8.

A small-diameter screw 14 is also inserted into this cylindrical body 13, and a gear 16 at the rear end is driven by a drive device.

The structure of other parts is the same as the embodiment shown in FIG.
4 is also driven, and the metal paste 1 is put into the hopper 12.
5 is extruded from the cylinder 13 into the insertion hole 9 at the same speed as the extrusion speed of the material 11, the same material as shown in FIG. 1 is extruded from the extrusion lower.

The metal used for the paste 15 is also the same as the metal wire used as the conductor 1 in the extrusion IIA.

Immediately after extrusion, the long molded article A produced by the above-mentioned ¥J manufacturing method is wound into a spiral shape as shown in FIG. 4 before it hardens.

At this time, it is easy to wind it in a spiral shape by wrapping it around 8 rods such as a round rod.

The spirally wound material is cut into an appropriate length as shown in FIG.

The cut end becomes flat as shown in FIG. 6, and the end of the conductor 1 is exposed.

The cut pieces are placed in a firing furnace (not shown) and fired.

At this time, the molded product may be fired after being pressurized or while being pressurized.

A metal terminal 17 is attached to the exposed end surface of the conductor 1 as shown in FIG.
By electrically connecting the inductance element 18 with solder or the like, the inductance element 18 becomes a product.

FIG. 8 shows another embodiment, in which two green sheets 21 and 22 made of magnetic material are used. One green sheet 21 is printed with metal paste using a printing plate 23 to form a band-shaped conductor 24, and this sheet 21 and the other sheet 22 are pressed together by upper and lower rollers 26 and 27 to form a band-shaped molded material. This molded body is then spirally wound in the same manner as the rod-shaped molded body A described above to produce an inductance element.

In addition, as shown in a, b, and c in Fig. 10, there is a molded body E with a rectangular cross section and a conductor 1 in the center, and a molded body F1 with a rectangular cross section and a conductor 1 on one side. Alternatively, a polygonal molded body G having an L5 body 1 at the center may be used.

Further, in the above embodiment, an example was shown in which the elongated molded body was wound around 8 rods, but as another example, 8 rods or cylindrical magnetic molded bodies of the same type or different types could be wound around 8 rods, and the above-mentioned one having a conductive material could be wound. There is also a method in which various molded bodies are spirally wound and fired together with eight rods, and a magnetic core is sometimes placed in the spiral unit after firing.

It goes without saying that the number of conductors provided in the molded body is not limited to one, but may be two or more.

Effects> As described above, the present invention uses an elongated molded body with a predetermined cross section provided with a conductor in the longitudinal direction, and by winding this in a spiral shape and sintering it, an inductance element is created. Since it is manufactured by hand, molded objects can be manufactured continuously.

Therefore, mass productivity is extremely high. Furthermore, since the internal electrodes are spiral-shaped, the product has advantages such as being able to obtain a large L despite being small.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing one embodiment of the elongated molded body used in the present invention, FIGS. The figure is a side view showing the manufacturing process, Figure 6 is an end view of the one shown in Figure 5, Figure 7 is a side view of an example of the manufactured inductance element, and Figure 8 is another example of the manufacturing method. A perspective view, FIG. 9 is a cross-sectional view of a molded body manufactured by the same apparatus, and FIG. 10, a,
b and c are cross-sectional views showing other examples of elongated molded bodies. 1... Electric conductor 2... Magnetic layer A...
Long molded body applicant's agent Patent attorney Kazu 1) Showa 1 Figure 8 Figure 4 Figure 6

Claims (4)

[Claims] (1) An inductance element characterized in that a long molded body in which a magnetic layer and a conductor are arranged in parallel is spirally wound and sintered. (2) The inductance element according to claim 1, wherein the elongated molded body is composed of a magnetic layer having an arbitrary cross section and having a conductor inside. (3) The inductance element according to claim 1, wherein the elongated molded body is a strip-shaped magnetic layer having a conductor inside. (4) Continuously molding a long molded body in which a magnetic layer and a conductor are arranged in parallel, and winding this molded body in a spiral shape,
A method for manufacturing an inductance element, the method comprising firing the inductance element thereafter.