JPH11273956A - Inductance element - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable the miniaturization and height reduction, by comprising a magnetic core and winding formed around the magnetic core, and winding a magnetic wire overlaid on the outside of the winding. SOLUTION: A magnetic core 11 is formed from a magnetic block such as ferrites and uses the so-called drum-like core having a columnar bobbin with circular plate-like flanges 12, 13 provided at both end faces, a winding groove 14 is formed between the flanges 12, 13, a winding 15 is wound in the winding groove 14 of the magnetic core 11, a magnetic wire 18 is wound on the winding 15, uses a steel wire plated with a magnetic material such as permalloy and is wound, overlaying the winding 15 so that the winding 15 in the winding groove 14 of the magnetic core 11 is enclosed with the magnetic core 11 and magnetic wire 18, and the magnetic wire 18 is fixed at both ends to specified terminals on a base 16 so as to avoid releasing from the magnetic core 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a closed magnetic circuit type inductance element having a magnetic core and a winding wound around the magnetic core.

[0002]

2. Description of the Related Art FIG. 2 is a sectional view of a conventional inductance element. A conventional inductance element includes a magnetic core 21 in which a winding 25 is provided on a base 26 having a plurality of terminals.
Is fixed. Both ends of the winding 25 are connected to predetermined terminals of the base 26, respectively. Then, a pot-shaped magnetic core 27 is fixed to the base 26 so as to cover the magnetic core 21, and a closed magnetic path is formed by the magnetic core 21 and the pot-shaped magnetic core 27.

[0003]

In the inductance element formed as described above, the magnetic core 21 is covered with a pot-shaped magnetic core 27 to form a closed magnetic circuit. Therefore, the conventional inductance element has a problem that it has a larger shape and a higher height than an open magnetic path type inductance element that does not use a pot-shaped magnetic core.

An object of the present invention is to provide a small-sized, low-profile inductance element which forms a closed magnetic circuit without using a pot-shaped magnetic core.

[0005]

An inductance element according to the present invention includes a magnetic core and a winding wound around the magnetic core, and a magnetic wire is wound around the winding outside of the winding.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The inductance element of the present invention
A winding is wound around the magnetic core, and a magnetic wire is wound over the winding. Therefore, a magnetic path is formed by the magnetic characteristics of the magnetic wire, and a closed magnetic path is formed by the magnetic wire and the magnetic core.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an inductance element according to the present invention will be described with reference to FIG. FIG. 1 is a sectional view showing one embodiment of the inductance element of the present invention. In FIG. 1, 11
Is a magnetic core, 15 is a winding, and 16 is a base. The magnetic core 11 is formed of a magnetic material such as ferrite, and a so-called drum core having circular plate-shaped flanges 12 and 13 provided at both ends of a cylindrical winding shaft is used. This Tsuba 12 and Tsuba 1
3, a winding groove 14 is formed. A winding 15 is wound inside the winding groove 14 of the magnetic core 11. This winding 15
A magnetic wire 18 is wound on the top as described later. Magnetic wire 1
Reference numeral 8 denotes a copper wire whose surface is plated with a magnetic material such as permalloy. The winding 15 is surrounded by the magnetic core 11 and the magnetic wire 17 in the winding groove 14 of the magnetic core 11. It is wound over the winding 15.

The base 16 is made of resin or the like, and has a plurality of terminals provided on the bottom surface. On the upper surface of this base 16,
The magnetic core 11 is fixed. Then, both ends of the winding 15 are connected to predetermined terminals of the base 16. Both ends of the magnetic wire 18 are fixed to predetermined terminals of the base 16 so as not to be unwound from the magnetic core 11. When the thus formed inductance element of the present invention is mounted on a printed wiring board such as an electronic device, only the terminal to which the winding 15 is connected is connected to the wiring pattern of the printed wiring board.

Although the embodiments of the inductance element of the present invention have been described above, the present invention is not limited to these embodiments.
For example, a plurality of windings may be wound around the magnetic core.
The base may be provided with a surface connection terminal on a side surface. Further, a terminal may be provided on the magnetic core.
Further, the shape of the magnetic core can be variously changed.

[0010]

As described above, the inductance element of the present invention can form a closed magnetic circuit by a magnetic core and a magnetic wire wound around the outside of the winding, so that the conventional inductance element can be formed without deteriorating its characteristics. The size and height can be reduced. In addition, the inductance element of the present invention can wind a magnetic wire around the outside of a winding using a winding machine in the same manner as a winding, so that the same as before without increasing the machine for winding the magnetic wire. It can be manufactured with a winding machine. Further, the inductance element of the present invention can form a more complete closed magnetic circuit than the conventional inductance element by covering the pot-shaped magnetic core so as to cover the magnetic core. Furthermore, in the inductance element of the present invention, when a plurality of windings are wound around a magnetic core, the magnetic coupling between the plurality of windings can be equal to or stronger than that of the related art.

[Brief description of the drawings]

FIG. 1 is a sectional view showing one embodiment of the inductance element of the present invention.

FIG. 2 is a sectional view showing a conventional inductance element.

[Explanation of symbols]

 11 Magnetic core 15 Winding 16 Base

Claims (2)

[Claims] 1. An inductance element comprising: a magnetic core; and a winding wound around the magnetic core, wherein a magnetic wire is wound around the outside of the winding. 2. An inductance element comprising: a magnetic core; and a winding wound around the magnetic core, wherein a magnetic wire is superposed and wound on the winding.