JP3403861B2 - Manufacturing method of chip inductor and inductor array - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention has a winding diameter of, for example, 1
The present invention relates to a method for manufacturing a microminiature chip-shaped inductor and an inductor array in which a microminiature coil-shaped conductive wire such as mm is embedded in a magnetic core.

[0002]

2. Description of the Related Art Conventionally, as a small-sized, high-impedance chip-shaped inductor, one in which a coil-shaped conductor is embedded in a magnetic core is known.

[0003]

The conventional inductor of this type is small in size and can obtain high impedance. However, an ultra-small coiled conductor having a winding diameter of 1 mm is embedded in the magnetic core. It was very difficult to manufacture a microminiature inductor.

An object of the present invention is to provide a manufacturing method capable of easily manufacturing a microminiature chip-shaped inductor and an inductor array in which such a microminiature coiled conductor is embedded in a magnetic core. It is what

[0005]

In order to achieve the above object, a method for manufacturing a chip-shaped inductor according to the present invention comprises:
A conductive material is wound around a winding core having rigidity, the windings of the conductive wire are fixed to each other with an adhesive, the core is removed, and a kneading material of a magnetic raw material powder and a binder is placed inside the conductive wire wound in a coil shape. To form a core body, and the extruding machine covers the core body and the wire wound in a coil shape to form an envelope body with the kneading material, and then the core body and the envelope body are fired. After that, a plurality of chip-shaped inductor bodies are formed by cutting into a predetermined length, and external electrodes connected to both ends of the coil-shaped conductor are formed on both end surfaces of the magnetic body of the chip-shaped inductor bodies. . Further, in the method for manufacturing the chip-shaped inductor and the inductor array according to the present invention, the conductive wire is wound around a winding core having rigidity, the windings of the conductive wire are fixed to each other with an adhesive, and then the winding core is removed to form a coil. The core is formed by filling the kneading material of the magnetic raw material powder and the binder into the inside of the conductive wire wound in the shape of a wire, and then wound into a plurality of cores and coils arranged in parallel by an extrusion molding machine. Forming an outer jacket made of a kneading material that continuously surrounds the conductor wire, firing the core body and the outer jacket, and cutting the core body and the outer jacket into a predetermined length to form a plurality of chip-shaped inductor bodies or inductor array bodies. make,
External electrodes are formed on the outer peripheral surface of the magnetic material of the chip-shaped inductor body and connected to the ends of a plurality of coil-shaped conductors connected to each other. It is characterized in that an external electrode connected to both terminals is formed.

[0006]

According to the structure of the present invention, a conductive wire is wound around a rigid core made of, for example, a metal material, the windings of the conductive wire are fixed to each other with an adhesive, and then the core is extracted to form a coil. Since the kneaded material of the magnetic raw material powder and the binder is filled into the wound conductor wire by suction, for example, to form a core, the diameter of the core made of the kneaded material of the magnetic raw material powder and the binder is, for example, 1
Even with an ultra-small diameter such as mm, a conductor wire wound in a coil shape can be wound without damaging the core body. Further, even if the conducting wire is thin and its stiffness is weak, since the windings of the conducting wire are fixed to each other by an adhesive after winding, the winding of the conducting wire wound in a coil shape is not disturbed. A chip-shaped inductor or inductor array substrate is created by forming one or more of the core and one or more of the wire wound in a coil shape to form the outer cover of the kneaded material, and firing the chip-shaped inductor or inductor array base material. External electrodes are formed on the inductor body or the inductor array body.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a chip-shaped inductor manufactured by the manufacturing method according to the present invention. In the figure, 1 is a magnetic body made of, for example, ferrite, in which a coil-shaped conducting wire 2 is embedded, and both ends thereof are connected to external electrodes 3 and 3 formed on both end surfaces of the magnetic body. There is.

This chip-shaped inductor is manufactured as follows. First, a conducting wire 5 is wound as shown in a winding core 4 having rigidity such as a metal wire as shown in FIG. 2, and the wound conducting wire 5 is bonded with resin such as resin as shown in. Agent 6 is applied and the windings are fixed to each other. Then, the winding core 4 is removed as shown in. The core 4 is filled with a kneading material composed of a magnetic raw material powder and a binder by suction as shown in FIG. On the core body 7 having the conducting wire 5 wound on the surface thereof, an outer casing body 8 of a kneading material is formed as shown by an extrusion molding machine (not shown). After that, cutting is performed according to the size of the firing furnace or the shape of the setter to be laid below. Then, this is fired at 600 to 1000 ° C., for example 900 ° C. to form an inductor assembly, which is then cut by a cutter according to the dimension of each inductor in the length direction of the coil-shaped conducting wire. Next, FIG. 1 shows the external electrodes 3 and 3 which are connected to the ends of the coil-shaped conductor 2 by applying and baking a silver paste composed of silver powder and a solvent on the front end surface and the rear end surface of the magnetic body 1 of the inductor base. To form. Nickel plating and solder plating are applied on the silver layers of the external electrodes 3, 3.

FIG. 3 shows another example of the chip-shaped inductor manufactured by the manufacturing method according to the present invention.

In FIG. 1, a plurality of, for example, four coil-shaped conductors 2 are arranged in parallel and embedded inside a magnetic body 1 made of ferrite having a rectangular parallelepiped shape, and each coil-shaped conductor 2 is at the front end of the magnetic body 1. Are connected in series with each other by connecting electrodes 3a formed on the front surface and the rear end surface, and both ends thereof are magnetic bodies 1
Are connected to the external electrodes 3 and 3 formed on the left and right end surfaces of.

This inductor is manufactured as follows.

First, the conductor 5 is passed through the steps of FIG.
A plurality of cores 6 wound with are prepared, these are arranged in parallel as shown in FIG. 4, and fed into the extrusion molding machine 9. Since the kneading material 11 in which the magnetic raw material powder B and the binder S are uniformly kneaded in advance in the kneading machine 10 at an appropriate mixing ratio is pressure-supplied to the extrusion molding machine 9, it is supplied from the outlet of the extrusion molding machine 9. A jacket 12 having a rectangular cross-section is formed to continuously surround each core body 6 and the conductive wire 5 wound in a coil shape, and is extruded at a speed of 30 m / min, for example. After that, the chip-shaped inductor body 13 is subjected to the same steps as those in the above-mentioned embodiment.
Is formed. Connection electrodes 8 and external electrodes 3, 3 are formed on the inductor body 13 as shown in FIG.

FIG. 5 shows an example of an inductor array manufactured by the manufacturing method according to the present invention.

In this inductor array, four coil-shaped conductors 2 are embedded in a magnetic body 1, and both ends of each of the external electrodes 3 and 3 are formed on the front and rear surfaces of the magnetic body 1.
Is formed by being connected to.

The base material of this inductor array is prepared in the same manner as the base material of the chip-shaped inductor shown in FIG. 3, and the external electrodes 3 and 3 are formed on the magnetic body 1 of the base material as shown in FIG. It is manufactured by

[0016]

According to the present invention, in the above structure, a microminiature chip-shaped inductor and an inductor array in which a microminiature coil-shaped conductor having a winding diameter of, for example, 1 mm is embedded inside a magnetic body. Has the effect that it can be manufactured under high productivity.

[Brief description of drawings]

FIG. 1 is a perspective view of a chip-shaped inductor manufactured by a manufacturing method according to the present invention.

2A to 2D are diagrams showing respective steps of a method for manufacturing the chip-shaped inductor shown in FIG.

FIG. 3 is a perspective view of another example of the chip-shaped inductor manufactured by the manufacturing method according to the present invention.

4 is a diagram for explaining a method of manufacturing the chip-shaped inductor shown in FIG. 3 and the inductor array shown in FIG.

FIG. 5 is a perspective view of the inductor array manufactured by the manufacturing method according to the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Magnetic body 2 Coil-shaped conducting wire 3 External electrode 4 Winding core 5 Conducting wire 6 Adhesive 7 Core body 8 Outer sheath body 9 Extrusion molding machine 10 Kneading machine 11 Kneading material 12 Outer sheath body

─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-7-74024 (JP, A) JP-A-64-53403 (JP, A) JP-A-6-325941 (JP, A) JP-A-6- 290955 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) H01F 41/10

Claims (3)

(57) [Claims] 1. A conductive wire is wound around a rigid winding core, the windings of the conductive wire are fixed to each other with an adhesive, and then the winding core is extracted, and a magnetic raw material powder is added to the inside of the conductive wire wound in a coil shape. A kneading material of a binder is filled to form a core body, and an extruder is used to cover the core body and a conductor wire wound in a coil shape to form a jacket body with the kneading material, and then the core body and the outside body. After firing the object, a plurality of chip-shaped inductor bases were prepared by cutting it into a predetermined length, and external electrodes connected to both ends of the coil-shaped conductor were formed on both end faces of the magnetic body of the chip-shaped inductor bases. A method for manufacturing a chip-shaped inductor, comprising: 2. A conducting wire is wound around a winding core having rigidity, the windings of the conducting wire are fixed to each other with an adhesive, the winding core is extracted, and a magnetic raw material powder is added to the inside of the conducting wire wound in a coil shape. A kneading material which is filled with a kneading material of a binder to form a core, and which then continuously surrounds a plurality of the cores and a coil-shaped conductive wire which are arranged in parallel by an extruder. A body is formed, the core body and the outer body are fired, and then cut into a predetermined length to form a plurality of chip-shaped inductor bases, which are connected to each other on the outer peripheral surface of the magnetic body of the chip-shaped inductor bases. A method of manufacturing a chip-shaped inductor, characterized in that an external electrode connected to the ends of the plurality of coil-shaped conductors is formed. 3. A conducting wire is wound around a winding core having rigidity, the windings of the conducting wire are fixed to each other with an adhesive, the winding core is extracted, and a magnetic raw material powder is added to the inside of the conducting wire wound in a coil shape. A kneading material which is filled with a kneading material of a binder to form a core, and which then continuously surrounds a plurality of the cores and a coil-shaped conductive wire which are arranged in parallel by an extruder. A body is formed, the core body and the outer body are fired and then cut into a predetermined length to form a plurality of chip-shaped inductor array bases, and both end surfaces of the magnetic body of the chip-shaped inductor array bases are formed. A method for manufacturing a chip-shaped inductor array, characterized in that external electrodes connected to both ends of a plurality of coil-shaped conductors are formed on the substrate.