JP2003045725A - Coil unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a coil unit, which adopts a rectangular winding as a coil and can be increased in the number of turns and efficiently improved in inductance, without increasing thickness. SOLUTION: A conductive rectangular winding (ribbon wire) 10, which is provided with at least one displaced part at which the lengthwise center line of the winding is displaced, is used. The ribbon wire 10 is wound on a ferrite core 2, and metal terminals 3a and 3b are each connected to the ends of the ribbon wire 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coil device, and more particularly to a coil device which uses a rectangular winding and realizes a high efficiency inductance value.

[0002]

2. Description of the Related Art A conventional coil device will be described with reference to FIGS. FIG. 5 is a view showing a cross section of the coil device 40, and FIG. 6 omits a part of a rectangular winding (hereinafter referred to as a ribbon wire) wound around a ferrite core 42 of the coil device 40. It is a top view shown.

Generally, a coil device generates a magnetic field by an electric current and has a self-inductance with respect to an alternating current.
Some conventional coil devices employ a ribbon wire in which a conductor wire is processed into a rectangular shape in order to achieve high efficiency of inductance (low DC resistance).

As shown in FIG. 5, such a coil device 40 is constructed by winding a ribbon wire 41 around a ferrite core 42 in a plurality of layers. Further, as shown in FIG. 6, metal terminals 43 a and 43 b, which are electrodes of the ribbon wire, are connected to the ends of the ribbon wire 41, and these metal terminals are fixed to the ferrite core 42.

[0005]

However, in the conventional coil device, even if the conductor wire is processed into a rectangular shape in anticipation of higher efficiency, the ribbon is designed according to the size required for the coil device. Since the thickness of the coil formed by the wire is limited, and the number of turns is limited, the upper limit can be set for the inductance value.

Therefore, the present invention has been made in view of the above-mentioned problems, and it is possible to increase the number of turns of the coil without increasing the thickness of the coil and to achieve a high efficiency of inductance. The purpose is to provide.

[0007]

In order to achieve the above object, a coil device according to the present invention has at least one displacing portion in which the center line is displaced in the width direction with respect to the center line in the longitudinal direction. It is composed of a conductive rectangular winding, metal terminals joined to both ends of the rectangular winding, and a ferrite core around which the rectangular winding is wound.

The displacement portion of the rectangular winding in the coil device is
The rectangular windings may be joined to each other via a conductive connecting member. Further, the displacement portion may be formed by bending the rectangular winding. Further, the displacement portion may be formed by pressing a rectangular winding wire, and may be further plated.

By providing a displacement portion in which the center line in the longitudinal direction is displaced in the width direction in the middle of the rectangular winding wire, the rectangular winding wire can be wound in two stages on the coil bobbin, and with the same thickness as the conventional one. The number of turns increases and the inductance improves. When a plurality of displacement parts are provided, the inductance can be further increased.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a coil device shown as a specific example of the present invention will be described in detail with reference to FIGS. As shown in FIG. 1, the coil device 1 includes a rectangular winding (hereinafter referred to as a ribbon wire) 10 obtained by processing a conductive metal cut into a predetermined length into a rectangular shape from a bobbin-shaped magnetic material such as ferrite. The ferrite core 2 is wound around the ferrite core 2 by a predetermined number of turns and attached, the metal terminals 3a and 3b are sandwiched between the flange portions 4 of the ferrite core 2, and these are bonded and attached. The metal terminals 3 a and 3 b are, for example, metal terminals obtained by coating phosphor bronze with tin and coating them, and these are bonded to both ends of the ribbon wire 10.

The ribbon wire 10 is, for example, a copper wire processed into a rectangular shape and coated with modified epoxy acrylic or the like, and a displacement portion in which the center line is displaced in the width direction with respect to the center line in the longitudinal direction. have.

The displacement portion of the ribbon wire 10 is shown in FIG.
As shown in detail in (a), it can be formed by joining the ribbon wires 10 to each other via a conductive connecting member 11 such as a copper wire. In this case, the ends of the respective ribbon wires are made to face the connecting member 11 whose length in the longitudinal direction is approximately twice the length in the width direction of the ribbon wire 10, and on the connecting member 11. The displacement portion is formed by joining them in parallel.

As shown in FIG. 2 (b), the ribbon wire 10 has a portion from the connecting member 11 serving as a displacement portion to one metal terminal 3a and a portion from the connecting member 11 to the other metal terminal 3b. And bobbin are wound so that and do not overlap each other. As a result, the ribbon wire 10 can be wound in two stages, so that the thickness of the coil body is not increased,
The number of turns can be doubled and the inductance can be improved.

Here, by providing a plurality of displacement portions formed by the connecting member 11, the ribbon wire 10
Can be wound in multiple stages, and the inductance can be further increased. Such a configuration is also within the scope of the present invention.

The displacement portion can also be realized by bending the ribbon wire. The ribbon wire 20 shown in FIG. 3 has a bent portion 21 in which the center line is displaced in the width direction with respect to the center line in the longitudinal direction by bending at a predetermined position. However, with respect to the configuration having the same function as in FIG. 1, the same numbers are given and detailed description thereof is omitted. The coil device 1 has the same advantages by winding and mounting the ribbon wire 20 around the ferrite core 2.

The displacement portion can also be realized by pressing the ribbon wire 10 into a shape having the displacement portion in advance. The ribbon wire 30 shown in FIG.
It is pressed as a shape having 1. However,
Constituents having the same functions as those in FIG. 1 are denoted by the same reference numerals and detailed description thereof is omitted. The coil device 1 is
The ribbon wire 30 is further plated, and wound around the ferrite core 2 to be attached, so that the same advantages can be obtained. Further, the ribbon wire 30 can be manufactured at low cost because it can be collectively formed without using the connecting member 11.

Further, when the ribbon wire 30 is wound around the ferrite core 2, the ribbon wire 30 has a specified length (specified by which the metal terminals 3a and 3b can clamp the flange portion 4 of the ferrite core 2 around the displacement portion 31). A preformed wire having a length capable of winding, and winding around the displacement portion 31 around the ferrite core 2 eliminates the bias of the ribbon wire caused by winding on one of the metal terminals. You can

As described above, in the coil device 1, the number of turns can be increased and the inductance can be improved by changing the shape of the ribbon wire 10 wound around the ferrite core 2. In the specific example described above, twice the number of turns as in the conventional coil device is realized within the range of the thickness and size required for the coil device.

[0019]

As described above, in the coil device according to the present invention, the rectangular winding wound around the ferrite core is provided with the displacement portion in which the center line is displaced in the width direction with respect to the center line in the longitudinal direction. By providing at least one, it is possible to increase the number of turns of the rectangular winding within the range of the size required for the coil device, and the efficiency of the inductance is improved.

The displacement portion of the rectangular winding can be formed by joining the rectangular windings via a conductive connecting member. Further, the displacement portion can be formed by bending the rectangular winding. Further, the displacement portion may be formed by pressing a rectangular winding wire and further subjected to plating treatment.
By providing a plurality of displacement parts, the number of turns can be further increased and the inductance can be further increased.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a coil device shown as a specific example of the present invention.

FIG. 2A is an external view showing an external appearance of a ribbon wire in a coil device shown as a specific example of the present invention,
(B) is a figure explaining how to wind a ribbon wire.

FIG. 3 is an external view showing the external appearance of a ribbon wire in a coil device shown as a specific example of the present invention.

FIG. 4 is an external view showing the external appearance of a ribbon wire in a coil device shown as a specific example of the present invention.

FIG. 5 is a cross-sectional view of a conventional coil device.

FIG. 6 is an external view showing the external appearance of a ribbon wire in a conventional coil device.

[Explanation of symbols]

1 coil device 2 Ferrite core 3a metal terminal 3b metal terminal 4 Flange part 10 Ribbon wire 11 Connection member 20 ribbon wire 21 Bent 30 ribbon wire 31 Displacement part

Claims (4)

[Claims] 1. A conductive rectangular winding having at least one displacement portion in which the center line is displaced in the width direction with respect to the longitudinal center line, and metal terminals joined to both ends of the rectangular winding. And a ferrite core around which the rectangular winding is wound. 2. The coil device according to claim 1, wherein the displacing portion is formed by connecting the rectangular windings to each other through a conductive connecting member. 3. The coil device according to claim 1, wherein the displacement portion is formed by bending a rectangular winding wire. 4. The coil device according to claim 1, wherein the displacement portion is formed by pressing the rectangular winding wire, and is further plated.