JPH10106841A - Chip-like inductor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate reduction in impedance value and eliminate a possibility that a conductor is bent to cause disconnection, by burying a linear conductor made of a bundle of twisted wires into a fired magnetic core. SOLUTION: A linear conductor 2 is buried in a magnetic core 1 of a rectangular-parallelepiped shape. This magnetic core 1 is formed by firing a kneaded material which is formed by kneading magnetic material powder and a binder. The linear conductor 2 is made by linearly forming a conductor 4 made of a bundle of twisted wires of two strands 41 , 42 using a plurality of materials such as platinum, gold, silver, palladium and nickel. In the magnetic core 1, a spirally wound coil-like conductor, a winding conductor, or a curved conductor, for example, curved in an S-shape, may be buried. Thus, reduction in inductance is eliminated and disconnection may also be eliminated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a chip inductor used in an electronic circuit.

[0002]

2. Description of the Related Art The applicant of the present invention firstly forms an outer body with a kneaded material obtained by kneading a raw material powder and a binder around a linear conductor, for example, by coating the outer periphery of the linear conductor with an organic substance, surrounding the linear conductor. After that, a method of manufacturing a chip-type inductor, which is fired to eliminate the organic matter, was proposed.

[0003]

According to the method of manufacturing a chip-type inductor, the magnetic core a
As shown in FIG. 5, as shown in FIG. 5, contraction force W and L in the direction perpendicular to and in the same direction as the linear conductor b act on the linear conductor b. Since the organic matter (not shown) covering the outer periphery of the conductive wire b disappears, the contraction force W of the magnetic core a is absorbed in the space where the organic matter disappears, and the stress of the contraction force W acting on the magnetic core a is reduced. Is done. Therefore, the chip-type inductor manufactured by the manufacturing method has an effect that the impedance value does not decrease due to the stress and that the frequency characteristics of the impedance do not vary during mass production. However, when the magnetic core a contracts in the same direction, the magnetic core a is hooked on the conductor b, and the contraction force L acts on the linear conductor b.
There is a problem that the conducting wire a may be bent and disconnected, and therefore may not act as an inductor. In addition, when the contraction force L does not act on the linear conductive wire b, both ends of the conductive wire b protrude from both end surfaces of the magnetic core a by an amount corresponding to the contraction of the magnetic core a, and the conductive wire b may come off. was there.

The present invention relates to an improvement of the above proposed invention,
There is no decrease in the impedance value due to the contraction of the magnetic core during firing, in a direction perpendicular to the straight, coiled, curved or bent conductive wire surrounded by the magnetic core, and the magnetic core in the same direction as the conductive wire. An object of the present invention is to provide a chip-type inductor in which a conductive wire is not likely to be bent and disconnected due to shrinkage, and in the case of a linear conductive wire, the conductive wire does not protrude from a magnetic core and escape.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a burned magnetic core comprising a straight line composed of a bundle of burned wires. 3. A coiled, curved or bent conductive wire comprising a burned bundle in a fired magnetic core, characterized in that the conductive wire is embedded. Is buried.

According to the above configuration of the present invention, when the magnetic core shrinks by firing, the shrinkage stress acting on the magnetic core in the direction perpendicular to the conducting wire is reduced by the element of the conducting wire composed of the burned bundle. Since the impedance is reduced by the gap between the wires, the impedance of the inductor does not decrease, and the contraction force in the same direction is alleviated by shrinking the strand of the bundle that is thinner than the single wire. Therefore, there is no possibility that the conducting wire is broken, and in the case of a straight conducting wire, the conducting wire does not protrude from the magnetic core and comes off.

[0007]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 shows a chip-type inductor of the present invention using a linear conductor.

In FIG. 1, reference numeral 1 denotes a rectangular parallelepiped magnetic core, 2 denotes a linear conductor embedded in the magnetic core 1,
Are electrodes connected to both ends of the linear conductor 2.

The magnetic core 1 is formed of a kneading material obtained by kneading a magnetic raw material powder and a binder and fired, and is made of, for example, ferrite. The linear conductor 2 is composed of a plurality of
For example, a conductive wire 4 composed of a bundle of _two wires 41 ₁ , 42 burned using a material such as platinum, gold, silver, copper, palladium, nickel or the like is formed in a straight line. Electrode 3
Are, for example, silver electrodes formed on both end surfaces of the magnetic core 1 and both end surfaces of the outer peripheral surface connected to the both end surfaces, on which nickel plating and lead-tin plating are applied. The wires 4 ₁ and 4 ₂ of the conductive wire 4 are bare wires, but may be those in which an organic substance which is burned off during firing is coated on the outer periphery in advance, or may be coated with a material which will not be burned.

The burning pitch of the conductive wire 4 is determined by the magnetic core 1
May be selected as appropriate according to the shrinkage stress of the magnetic core 1.

[0012] The magnetic core 1, the lead wire 4, as shown in FIG. 2, may be embedded coiled wire 2 ₁ wound spirally, as shown in FIG. 3, bent in a U-shape may be embedded bent shape conductor 2 ₂ that, although not shown, bent like wire bent in a triangular shape, or, for example, may be embedded curved wire which is curved in an S shape.

FIG. 4 shows a chip type inductor of the present invention used as a common mode choke coil.

[0014] In the same way as shown in FIG. 2, the coiled wire 2 ₁ is embedded in the magnetic core 1, a pair of electrodes 3 ₁ to both ends separated each of the magnetic core 1, 3 ₂ are formed I have. The bundle of the conductive wires 4 is burned in the same manner as described above, and the wires 4 ₁ and 4 ₂ are coated so as not to be burned during firing. Both terminals of the wire 4 ₁ each electrode 3 _1, 3
Connected to _one, both terminals of the wires 4 ₂ are respectively connected to the electrode 3 _2, 3 _2. It may be used straight conductor 2 instead of the coil-shaped conductive wire 2 _1.

In the chip-type inductor shown in FIG. 1, when the magnetic core 1 is fired, contraction stress in the direction perpendicular to the linear conductor 2 acts on the linear conductor 2. As described above, this contraction stress is applied to the wires 4 ₁ and 4 _2. And the inductance is not reduced. In addition, the contraction force in the same direction is alleviated because each of the strands 4 ₁ and 4 ₂ of the bundle is contracted, and is not disconnected.
It does not protrude from the end face of the magnetic core 1. Further, FIGS. 2, 3 and also a chip-type inductor shown in FIG. 4, a coil-shaped conductors 2 ₁ and bent shape conductor 2 ₂ upon firing of the magnetic core 1
The contraction stress in the direction perpendicular thereto and the contraction stress in the same direction, that is, the stress of the component force in the conductor direction of the contraction force in the axial direction of the magnetic core 1 are applied. Therefore, there is no decrease in inductance and there is no disconnection.

[0016]

According to the present invention, according to the above-described structure, the impedance value due to the contraction of the magnetic core during firing in the direction perpendicular to the linear, coiled, curved or bent conductive wire surrounded by the magnetic core. There is an effect that there is no reduction, and the conductor is not bent or broken due to contraction of the magnetic core in the same direction as the conductor, and in the case of a straight conductor, the conductor does not protrude from the magnetic core and come off.

[Brief description of the drawings]

FIG. 1 is a perspective view of a chip-type inductor of the present invention having a straight conducting wire.

FIG. 2 is a perspective view of a chip-type inductor of the present invention having a coiled conductive wire.

FIG. 3 is a perspective view of a chip inductor of the present invention having a bent conducting wire.

FIG. 4 is a perspective view of the chip inductor of the present invention applied to a common mode choke coil.

FIG. 5 is a perspective view of a chip-type inductor having a linear conductor proposed earlier.

[Explanation of symbols]

1 Magnetic core 2 Linear conductor 2 ₁ Coiled conductor 2 ₂ Bent conductor 3 3 ₁ 3 ₂ Electrode 4
… Conductor wire consisting of bundled wires 4 ₁ , 4 ₂ …

Claims (2)

[Claims] 1. A chip-type inductor comprising a burned magnetic core and a linear conductor made of a bundle of burned wires embedded therein. 2. A chip-type inductor comprising a baked magnetic core and a coiled, curved or bent conductive wire made of a bundle of burned wires embedded therein.