JP2003017328A - Inductance element using flat type wire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inductance element using a flat type wire that can cope with a large current, calculate proximity effect due to a high frequency easily, and improve a space factor. SOLUTION: A winding 3 for generating a magnetic field is formed by overlapping at least two flat type wires 4 and 5 in an axial direction for winding spirally. Terminal electrodes 40 and 50 are formed by the end section of the flat type wires 4 and 5. In the terminal electrodes 40 and 50, a projection 33 for projecting from contact surfaces 40a and 50a to the outside is formed.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to an electronic circuit element such as a choke coil, an antenna coil, a reactor or a transformer, which is an inductance element using a rectangular wire.

[0002]

2. Description of the Related Art As a conventional inductance element of this type, one round wire or two or more round wires stacked in the axial direction of a winding are spirally wound to form an air-core coil or a winding with a core. It is known that, as shown in FIG. 5, one flat wire 1 is spirally wound into a circular shape to form a winding 2 having an air-core coil shape or a core (not shown).

[0003]

However, an inductance element in which two or more round wires are axially overlapped and spirally wound allows a large current, but on the other hand, it is easy to calculate the proximity effect due to high frequency. In addition, it is difficult, and the adjacent winding portions are in line contact with each other, so that a tight contact state is not obtained. Therefore, the space factor is poor and the overall shape becomes large.

On the other hand, the inductance element in which one flat wire 1 is spirally wound as shown in FIG. 5 has an advantage that the proximity effect due to high frequency can be easily calculated, but the thickness of the flat wire is increased in order to increase the current. When the size is increased and the cross-sectional area is increased to the same extent as that of the round wire, the skin effect causes a decrease in the current, so that the current cannot be increased in the end.
Moreover, since only one rectangular wire 1 is used, two or more terminal electrodes cannot be provided.

The present invention has been made in view of the above-mentioned conventional problems, and it is possible to increase the current, easily calculate the proximity effect due to high frequency, and improve the space factor. It is intended to provide an inductance element used.

[0006]

In order to achieve the above object, an inductance element using a rectangular wire according to one aspect of the present invention is such that a winding for generating a magnetic field has two or more rectangular wires in the axial direction. It is formed by spirally winding it.

According to this structure, since two or more flat wires are stacked in the axial direction of the winding and spirally wound to form a winding, the sum of the cross-sectional areas of the respective stacked flat wires is added. Can be set to a cross-sectional area equivalent to the cross-sectional area of a round wire, and by increasing the thickness as in the case of one rectangular wire, the skin effect does not reduce the current,
It is possible to increase the current. In particular, in the case of the air-core coil shape, it is possible to obtain a high frequency inductance element such as an antenna coil or a choke coil having a large energy storage amount. In addition, since the plurality of stacked flat wires and the flat wire bundles composed of a plurality of flat wires can be wound in close contact with each other in surface contact, the space factor can be improved and the thickness can be reduced. The thermal conductivity increases with an increase in the heat conductivity, and an excellent heat dissipation effect can be obtained. Moreover, since the rectangular wire is used, the proximity effect due to high frequency can be easily calculated. Here, the rectangular wire means a conductor wire having a rectangular cross section.

Preferably, a terminal electrode is formed by the end of the rectangular wire. As a result, the end of the rectangular wire is
If the insulating coating such as enamel coated on this is peeled off, it can be used as it is as a terminal electrode, so that the existing terminal electrode becomes unnecessary. Moreover, since two or more rectangular wires are wound in the axial direction so as to be overlapped with each other, it is possible to provide at least four terminal electrodes at the ends of each rectangular wire, and the number of connection points to the circuit board or the like is increased accordingly. There is an advantage.

An inductance element using a rectangular wire according to another structure of the present invention is characterized in that a terminal electrode formed by an end of the rectangular wire is
A protrusion protruding from the contact surface with the outside is formed. According to this configuration, even if the outer contact surface such as the land surface on which the terminal electrode is mounted on the circuit board has waviness or unevenness, the protrusion protruding outward from the contact surface of the terminal electrode is landed. Since the surface is reliably contacted, a reliable electrical connection state can be obtained.

[0012] Preferably, it is possible to have a core that forms a magnetic path through which the magnetic field generated by the winding passes and to which the terminal electrode is joined. Thereby, it is not necessary to separately provide a member such as a bobbin for holding the terminal electrode, and the structure is simplified. Further, the inductance element can be mounted in a surface mounting form by directly joining the core to the circuit board.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view showing an inductance element according to the first embodiment of the present invention. In this inductance element, an air-core coil-shaped winding 3 that generates a magnetic field is formed by spirally winding two rectangular wires 4 and 5 in the axial direction of the winding 3. Both ends of the lead wires 4a, 4b, 5a, 5b of the rectangular wires 4, 5 are made into terminal electrodes 40, 50 by peeling off the insulating coating such as enamel coated thereon.

Since the inductance element is formed by spirally winding two flat wires 4, 5 in the axial direction of the winding 3, the existing flat wire is obtained by the sum of the cross-sectional areas of the flat wires 4, 5. The cross-sectional area can be set to be equal to the cross-sectional area of the round wire, and the current does not decrease due to the skin effect as in the case of increasing the thickness of one rectangular wire to increase the cross-sectional area. It is possible to increase the current. In particular, in the case of the air-core coil shape as in the above embodiment, it can be used as a high frequency inductance element such as an antenna coil or a choke coil having a large energy storage amount.

Further, in the above-mentioned inductance element, in the state where the two rectangular wires 4 and 5 are in close contact with each other for surface contact, the rectangular wire bundle W composed of the two rectangular wires 4 and 5 is also in close contact with each other for surface contact. Since it can be wound, the space factor is improved and the overall shape can be downsized, and the thermal conductivity increases as the contact area increases, and an excellent heat dissipation effect can be obtained. Moreover, since the inductance element forms the winding 3 by using the rectangular wires 4 and 5, the proximity effect due to high frequency can be easily calculated.

Further, the inductance element has four terminal electrodes 40, which are formed by the ends of the two rectangular wires 4, 5.
Since 40, 50, and 50 are formed, the existing terminal electrodes are not required, and the number of connection points to the circuit board can be increased by the increase in the number of terminal electrodes 40 and 50.

In the above embodiment, the case where the rectangular wires 4 and 5 are spirally wound into a circular shape to form the winding 3 has been exemplified, but the rectangular wires 4 and 5 are spirally wound into an elliptical shape or a polygonal shape. The same effect as described above can be obtained as the winding, and in particular, when the winding is thinned, it is preferable to have an elliptical shape.

FIG. 2 is an exploded perspective view showing an inductance element according to a second embodiment of the present invention, and FIG. 3 is a perspective view showing a completed assembly state of the inductance element. This inductance element has a rectangular outer core 19 when viewed from the first direction C.
Is composed of two core divided bodies 20 of the same shape divided by the dividing surface 22 of FIG. 3 which is orthogonal to the first direction C. The outer core 19 is configured by joining two core divided bodies 20 to each other by a joining means such as an adhesive, and has a flat rectangular parallelepiped shape.

As shown in FIG. 2, in each core division body 20, one surface orthogonal to the first direction C is closed by a wall 23, and the inner surface of the core division body 20 faces the first direction C. Protrusions 2 and extending along the outer periphery of the wall 23
4A to 24D are formed, and the wall 23 and the protrusions 24A to 24D are formed.
An inner space 27 that is recessed by is formed. The pair of projecting portions 24A, 24B facing each other of each core split body 20 are
A recess 28 that opens toward the inner space 27 is formed. Further, a cutout 30 is formed in the other pair of protrusions 24C and 24D, and the two cutouts 30 have a rectangular shape in which two core divided bodies 20 are butted against each other as shown in FIG. The through hole 29 is formed.

A winding 32 is wound around the center of the flat middle core 31 shown in FIG. This winding 32
In the same manner as in the first embodiment, the two rectangular wires 4 and 5 are formed in such a manner that they are overlapped in the axial direction of the winding 32 and are double-wound in a spiral shape. Both ends of each rectangular wire 4 and 5 are lead wires 4a,
4b, 5a, 5b, each of which has its tip portion peeled away to remove the insulating coating such as enamel.
0, 50, and each terminal electrode 40, 50
The protrusions 33 are formed on the contact surfaces 40a and 50a with the outside of the machine by pressing.

The middle leg core 31 having the winding 32 wound around the center is formed by upper and lower recesses 28 by fitting both ends thereof into the recesses 28 of the respective core split bodies 20. Is held in the holding hole. At this time, each leader line 4a, 4b,
Each of 5a and 5b is led out to the outside from the through holes 29 on both sides, as shown in FIG. The protrusions 24C and 24D having the openings 29 are joined to the outer surfaces by joining means such as an adhesive.

This inductance element is turned upside down from the state of FIG. 3 so that the four protrusions 33 projecting outward (downward) are brought into contact with the land surface (contact surface on the external side) of the circuit board. By soldering by soldering, it is mounted on the circuit board in a surface mounting form. At this time, even if the circuit board or the land surface has undulations or irregularities, since the protrusions 33 surely contact the land surface, a good electrical connection state can always be obtained. In addition, since both ends of the rectangular wires 4 and 5 are the terminal electrodes 40 and 50 in this inductance element, the existing terminal electrodes are not separately required.

In addition to the effect similar to that described in the first embodiment, the inductance element has the middle leg core 31 and the winding 32 housed in the inner space 27 of the outer core 19. Therefore, there is little magnetic leakage to the outside, and high magnetic permeability can be secured. Further, since the pair of core divided bodies 20 have the same shape, a high productivity can be obtained by reducing the number of parts. Further, the through hole 29
Is formed with an opening area larger than the cross-sectional shape of the rectangular wires 4 and 5, it has a function of drawing out the terminal electrodes 40 and 50 to the outside and a function of smoothly discharging the heat generated by the windings to the outside. Combine.

FIG. 4 is a partially cutaway side view showing how the inductance element according to the third embodiment of the present invention is attached to the circuit board 34. This inductance element is
Similar to the embodiment, the air-core coil-shaped winding 3 that generates a magnetic field is formed by spirally winding two rectangular wires 4 and 5 in the axial direction of the winding 3. Further, in this inductance element, the lead wires 4a at both ends of each of the rectangular wires 4 and 5,
The tip portions of 4b, 5a, 5b are formed on the terminal electrodes 40, 50 by peeling off the insulating coating such as enamel, and the terminal electrodes 40, 50 are exposed outside the contact surfaces 40a, 50a. A protrusion 33 protruding in one direction is formed by press working.

The inductance element is attached to the circuit board 33 by soldering the protrusions 33 so as to face the land surface 37 of the circuit board 33. Therefore, each terminal electrode 40, 50 can be always attached to the land surface 37 by the projection 33 in a reliable electrical connection state, and the yield of the component mounting board is improved.

[0024]

As described above, according to the inductance element using the rectangular wire of the present invention, since two or more rectangular wires are spirally wound in the axial direction, a large current can be achieved. At the same time, there is an advantage that the space factor is improved, an excellent heat dissipation effect can be obtained, and the proximity effect due to high frequency can be easily calculated.

[Brief description of drawings]

FIG. 1 is a perspective view showing an inductance element using a rectangular wire according to a first embodiment of the present invention.

FIG. 2 is an exploded perspective view showing an inductance element using a rectangular wire according to a second embodiment of the present invention.

FIG. 3 is a perspective view showing a state where the above inductance element is completely assembled.

FIG. 4 is a partially cutaway side view of a state in which an inductance element using a rectangular wire according to a third embodiment of the present invention is attached to a circuit board.

FIG. 5 is a perspective view showing an inductance element using a conventional rectangular wire.

[Explanation of symbols]

3, 32 ... Winding wire, 4, 5 ... Rectangular wire, 4a, 4b, 5a,
5b ... Leader wire, 19 ... Outer core, 33 ... Protrusion, 40, 50
... Terminal electrodes, W ... Rectangular wire bundle.

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Yukitaka Sakamoto             Tabuchi, 4-5 Techno Park, Sanda City, Hyogo Prefecture             Electric Co., Ltd. (72) Inventor Mahei Kotani             Tabuchi, 4-5 Techno Park, Sanda City, Hyogo Prefecture             Electric Co., Ltd. F term (reference) 5E043 AA01 AB03 BA04 EA01 EA06                 5E070 AB01 BA01 BA08 CA02 CA06                       DB02 EA02 EA07

Claims (4)

[Claims] 1. An inductance element using a rectangular wire in which a winding for generating a magnetic field is formed by spirally winding two or more rectangular wires in an axial direction. 2. The inductance element according to claim 1, wherein a rectangular wire in which a terminal electrode is formed by an end of the rectangular wire is used. 3. An inductance element using a rectangular wire, in which a projection protruding from a contact surface with the outside is formed on a terminal electrode formed by the end of the rectangular wire. 4. The inductance element according to claim 2 or 3, further comprising a core forming a magnetic path through which a magnetic field generated by the winding passes and the terminal electrode is bonded to the core.