JPS60245202A - Inductance element - Google Patents

Abstract

PURPOSE:To obtain an element which assures easy reduction in size and connection to circuits by forming a linear gap within a magnetic substance and allowing a conductive material to be poured into such gap. CONSTITUTION:A wire material of organic substance is embedded within a ferrite material at the time of molding a ferrite core. This molded substance is combusted by the heat processing under a temperature where the organic wire material 1 is decomposed and splashes from the inside of molded substance. A molded substance thus obtained is combusted in order to obtain a ferrite core having a gap of desired shape therein. This ferrite core is floated in a sealed conductor metal dissolving tank and inside thereof is vacuumized. Thereafter, air pressure within the dissolving tank is raised so that the dissolved metal is injected into the ferrite core. When the ferrite core is lifted out from the dissolving tank under this condition, linear conductors are formed within the ferrite core.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is an inductance using a magnetic material used as an electric circuit component, and is a novel inductance element obtained by a conductor formed inside the magnetic material. .

Conventional inductance elements, regardless of their shape, are generally wound around bobbins, cores, etc. using wire rods. However, the method of winding this wire around a bobbin, core, etc. is disadvantageous for miniaturization, and the winding process is also complicated.

FIG. 1 is a cross-sectional view of an example of a conventional inductance element. In this conventional example, the winding l112 is directly wound around the core 1, and the lead wire 4 of the winding is wound around the lead pin 3.

Furthermore, in recent years, chip inductance elements such as Melf type or laminated type have been available as small inductance elements, but these have complicated manufacturing processes and are expensive.

In view of the above, an object of the present invention is to provide an inductance element that can be easily miniaturized and easily connected to a circuit.

In order to achieve the above object, the present invention forms a gap of a desired shape inside a magnetic material, and flows a conductor into the gap to obtain an inductance element.

This will be explained in detail below with reference to the drawings.

FIG. 2 is a perspective view of a wire 6 made of an organic substance and having the same shape as the void to be formed inside the ferrite core. The organic wire rod used here may be any material as long as it burns at a temperature lower than the firing temperature of the ferrite core used, 900° C. to 1400° C., and leaves no ash.

This wire rod is embedded in the ferrite raw material during molding of the ferrite core. The molding method at this time may be any method such as powder molding or cast molding that allows the wire rod embedded inside the molded body to be molded without being significantly deformed after molding. A perspective view of the molded product thus obtained is shown in FIG.

Next, this molded body is heat-treated and burned at a temperature at which the organic wire l decomposes and scatters from inside the molded body, and a void having the same shape as the organic wire l is formed inside the ferrite core molded body. . When raising the temperature in this heat treatment, sufficient care must be taken because if the temperature is increased rapidly, the organic wire material will rapidly decompose and the inside of the ferrite core will be destroyed.

By firing the molded body thus obtained in a process similar to the firing process of ordinary ferrite, it becomes possible to obtain a ferrite core having voids of a desired shape inside. Here, after the heat treatment step for scattering the organic wire rod, the firing step may be continued without cooling.

Next, by increasing the air pressure inside the conductor gold layer tank in which the ferrite core is sealed, molten metal is injected into the ferrite core. When the ferrite core is pulled out of the melting tank in this state, a linear conductor is formed inside the ferrite core.

Alternatively, if the molten metal is solid at room temperature, this process is performed in a bath where the metal is being melted by heat, and after the metal is injected into the ferrite core, the ferrite core is pulled out of the bath. It's good to do it.

Next, one embodiment of the present invention will be described.

Example 1 Glue was drawn into a long thin wire with a diameter of 05 m, and the wire was wound around a 4 inφ Bakelite rod.
After heating with hot air at .degree. C., the material was cooled to harden into a coil shape to form a four-turn organic wire ring. This is embedded in Ni-Zn-based ferrite powder, which usually has a magnetic permeability of 1000, and formed into a rectangular parallelepiped using a powder molding press.
A molded article having a molding density of 3.1 g/cc was created.

Next, Tameko's compact was placed in an electric furnace filled with an oxygen atmosphere.
The temperature was raised at a rate of 50°C/h, held at 600°C for 12 hours, and then cooled to ensure that the organic wire had burned.
The temperature was raised at 1200° C. for 5 hours to sinter.

The obtained ferrite core sintered body was placed in a sealed aluminum solder tank made of porcelain, and after the inside of the aluminum solder tank was evacuated, a pressure of 8 atmospheres was applied using a compressor to perform the seven-stage light sintering process. Aluminum solder was injected into the body.

The inductance value of the thus obtained inductance element in which a ring-shaped conductor was formed inside the ferrite core was 8 μH.

It is theoretically clear that the inductance value of the inductance element according to the present invention is proportional to the length of the conductor inside the magnetic body. By increasing the length of , it is possible to obtain an arbitrarily high inductance value. Further, the conductor wire formed inside the magnetic material may have a shape other than a ring shape.

Further, in the inductance element of the present invention, electrodes can be easily formed by performing appropriate treatment on the ferrite core crystal in which the conductor formed inside the ferrite core is exposed. As a result, the inductance element f of the present invention
:11 It becomes easy to automatically attach it to the circuit board.

As described in detail above, the inductance element according to the present invention can be easily mass-produced by simplifying the manufacturing process, is a small and inexpensive inductance element, and can be easily mounted on a circuit board, making it extremely useful. It is something.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of an example of a conventional inductance element,
FIG. 2 is a perspective view of a wire used in one embodiment of the present invention, and FIG. 3 is a perspective view of one embodiment of the present invention. l Near elite core, 2: winding, 3: lead bin, 4:
Lead wire, 6: fs material. Figure 1 Figure 3 Figure 2

Claims (1)

[Claims] An inductance element formed by forming a linear void inside a magnetic material and allowing a conductive material to flow into the void.