JPH0831651A - Electronic part magnetic core - Google Patents

Abstract

PURPOSE:To obtain an electronic part magnetic core which is low in cost and electrically insulated from a conductive wire wound on it by a method wherein a protrudent insulator of resin or the like is provided to each of ridgeline regions which protrude outwards. CONSTITUTION:A magnetic core is formed like a ring, an outer peripheral part 12 and a side peripheral part 13 other than a part where the magnetic core is exposed in the inner peripheral region 11 of the magnetic core are covered with a resin lawyer 2, whereby ridgeline regions 14 to 17 are covered enough with the resin layer 2. Furthermore, rugged resin material of roughness 10 to l00mum is formed on the outer surface of the resin layer 2. By this setup, a winding wire is markedly enhanced in electrical insulation properties to a magnetic core, and an electronic part where a winding wire is free from disconnection and high in reliability can be obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used for a highly reliable electronic component having improved non-conductivity between a magnetic core in an electronic component such as an inductor and a transformer and a conductive wire wound around the magnetic core. It is about the magnetic core.

[0002]

2. Description of the Related Art Conventionally, in an electronic component (P ') such as a pulse transformer in which an insulating winding is wound around a magnetic core, the magnetic core (a) and the winding (b) are separated from each other. In order to ensure electrical insulation, a resin layer (c) was previously formed on the outer circumference of the magnetic core (a), and a winding (b) was applied to the outer circumference thereof (see FIG. 10).

[0003]

Even in the electronic component (P ') described above, since the insulating resin layer (C) is formed, the electric component is not provided between the magnetic core (A) and the winding (B). Although the electrical conduction is not generated, the insulating resin has an abnormally high unit price as compared with the magnetic core and has a drawback that the cost is high.

Further, there is a defect that the surface is not uneven and the winding easily slips and the winding collapses, resulting in poor power transmission efficiency.

An object of the present invention is to provide a magnetic core which solves the above-mentioned drawbacks, and a first object thereof is an inexpensive magnetic core for electronic parts having non-conductivity with a wound conductive wire. Is to provide.

A second object of the invention is to provide a magnetic core for electronic parts which has non-conductivity with a conductive wire to be wound, is less likely to be damaged by winding, and has excellent power transferability.

[0007]

The structural features of the present invention for achieving the above object are as follows.

(1) A magnetic core formed of a ferrite material or the like which is used for electronic parts such as a chip inductor by winding a conductive wire around its outer periphery, and a resin material is provided in a convex outward ridgeline region of the magnetic core. A magnetic core for electronic parts, which is formed with a salient arc-shaped insulating part.

(2) The magnetic core for electronic parts according to (1), wherein at least a part of the outer periphery is covered with a thin insulating layer such as a resin material.

(3) The unevenness of the outer surface of the insulating layer is 10
The magnetic core for electronic parts according to (1) above, wherein a resin material having an unevenness of -100 μm is formed.

(4) The magnetic core for electronic parts according to the above (1), wherein a convex arcuate insulating portion made of a resin material or the like is formed in a convex ridgeline region.

(5) The magnetic core for electronic parts according to the above (1), wherein an insulating portion having a concavo-convex part made of a resin material or the like is thinned on the outer periphery.

[0013]

[Operation] The configuration of the present invention is as described above, and the amount of resin for non-conductivity in the wound magnetic core for electronic components is small, so that not only can weight and cost be reduced, Since the unevenness is formed, it is difficult for the winding to collapse, and it is possible to obtain an excellent power transmission property.

[0014]

[Examples] Examples of the present invention will be described below with reference to the drawings. The magnetic core 1 used in each example is made of a fine ferrite powder having high magnetic permeability such as methyl cellulose, vinyl acetate, acrylic resin, or polyvinyl. It is assumed that the coil 2 is sufficiently kneaded with alcohol or the like, molded and fired, and the winding 2 wound around this is made of a copper wire surrounded by a covering material made of an organic material and having a diameter of about 100 μm. Further, as the resin material forming the insulating layer, polyurethane resin, epoxy resin, vinyl resin or the like is adopted.

(Embodiment 1) As shown in FIGS. 1 and 2, the magnetic core 1 in the embodiment 1 has a ring shape, and the outer periphery of the magnetic core 1 is exposed in the region of the inner peripheral portion 11 thereof. By covering the portion 12 and the side peripheral portion 13 with the resin layer 2, the ridge line regions 14 to 17 are sufficiently surrounded by the resin layer 2.

Next, an electronic component (P) shown in FIG. 1 is obtained by spirally winding the winding 30 around the outer periphery of the magnetic core 1 by a winding means (not shown).

Therefore, in this electronic component (P),
Since the winding wire 30 is wound on the magnetic core 1 with the resin layer 2 interposed therebetween, not only the magnetic core 1 and the winding wire 2 are safely secured in non-conductivity, but also the winding wire 30 is Sharp ridgeline area 1
In this case, a highly reliable electronic component (P) can be obtained without the risk of breakage in 4 to 17, and in addition, since the resin layer 2 is lacking in the inner peripheral portion 11 of the magnetic core 1, it is lightweight. The manufacturing cost can be reduced.

Further, FIGS. 3 and 4 show a modified example thereof, in which the inner peripheral surface 11A of the magnetic core 1A is shown in FIG.
Since the outer peripheral surface 12A lacks the resin layer 2A, the required amount of the resin material can be further reduced, and the same effect as that of the magnetic core 1 of FIG. 1 can be achieved. .

Further, in the magnetic core 1B shown in FIG. 4, the annular bulging resin layer 2B is formed only in the ridgeline regions 14B to 17B, and the inner and outer peripheral portions 11B and 12B of the magnetic core 1B are formed. In addition, since the magnetic core 1B is exposed by omitting the resin layer 2B also in the side peripheral portion 13B, the amount of the required resin material can be further reduced as compared with that in FIG. In each ridge line area,
In this case, there is no possibility that the winding is directly contacted with the magnetic core 1B or is not broken.

Next, the magnetic cores 1C to 1E shown in FIGS.
However, what is common to these is that the resin layers 2C to 2E are formed so that their thicknesses are partially different.

In the magnetic core 1C shown in FIG. 5, a concave portion 21 having a V-shaped cross section is formed in the resin layer 2C at the inner peripheral portion 11C.
In the same manner as in FIG. 6, the resin layer 2D has an arc-shaped concave portion 21D in which the resin layer 2D is partially formed into a thin film in the inner peripheral portion 11D of the magnetic core 1D.

Further, in FIG. 7, the inner peripheral portion 1 of the magnetic core 1E is shown.
Only in 1E, a flat recess 21E in which the resin layer 2E has a thin film shape is formed over substantially the entire area.

Therefore, even in the structure shown in FIG. 5 to FIG. 7, the winding does not directly contact the magnetic cores 1B to 1E to impair the non-conductivity, and the winding is not broken. Therefore, a highly reliable product can be obtained.

(Embodiment 2) In this embodiment, magnetic cores 1 to 1 are used.
It is characterized in that the surfaces of the resin layers 2 to 2E attached to the outer peripheral surface of E are made uneven.

That is, the magnetic core 1E of FIG. 7 in the first embodiment will be described as an example with reference to FIG.

In the magnetic core 1F shown in FIG. 8, by coating the outer surface of the magnetic core 1F by, for example, a spraying means (not shown), the resin material particles have a natural degree of unevenness of 10. The resin layer 2F is formed in a state where the resin layer 2F has an uneven shape of ˜100 μm.

When the winding is wound on the outer periphery of the magnetic core 1F thus obtained, the winding can be stably and neatly wound without shifting on the resin layer 2F.

Needless to say, the magnetic cores 1 to 1E shown in FIG. 1 to FIG. 6 are treated in the same manner as shown in FIGS.
It goes without saying that 2E is formed and the same function as that of the magnetic core 1F shown in FIG. 8 is exerted.

Although the above description has been made on a magnetic core having a ring shape, a resin layer is formed in the same manner as the ring-shaped magnetic core described above even in the magnetic core 1G having a square pole shape as shown in FIG. 9, for example. However, in this example, stability at the time of mounting and further ease of operation are recognized.

[0030]

As described above, the present invention has the following remarkable effects.

(1) It is possible to greatly improve the electrical non-conductivity between the winding and the magnetic core, and it is possible to obtain a highly reliable electronic component free from the risk of breakage of the winding.

(2) Since the resin layer for insulation that covers the magnetic core is provided mainly in the required places, the weight of the magnetic core is reduced, and the cost is reduced by reducing the required resin amount. Can be achieved.

(3) Since the surface of the resin layer has an irregular shape, winding collapse does not occur, and an electronic component having excellent power transmission can be obtained.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of an electronic component showing a first embodiment of the present invention.

FIG. 2 is a sectional view taken along the line KK of the magnetic core for electronic components of FIG.

FIG. 3 is a diagram showing a modification of the magnetic core shown in FIG.

FIG. 4 is a diagram showing a modification of the magnetic core shown in FIG.

FIG. 5 is a diagram showing a modification of the magnetic core shown in FIG.

6 is a diagram showing a modification of the magnetic core shown in FIG.

FIG. 7 is a diagram showing a modification of the magnetic core shown in FIG.

FIG. 8 is a vertical cross-sectional view of a magnetic core for electronic components according to a second embodiment of the present invention.

9 is a modification diagram of FIG. 2. FIG.

FIG. 10 is a partial vertical cross-sectional view of a conventional electronic component.

[Explanation of symbols]

 P, P'Electronic parts 1,1A-1G Magnetic core 11,11A-11E Inner peripheral part 12,12A, 12B Outer peripheral part 13 Side peripheral part 14-17,14B-17B Ridge area 2,2A-2G Resin layer 30 Winding

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tamotsu Saito 6-16-20 Ueno, Taito-ku, Tokyo Within Taiyo Denki Co., Ltd. (72) Inventor Kaisuke Daisuke 6-16-16 Ueno, Taito-ku, Tokyo No. 20 Taiyo Electric Co., Ltd.

Claims (5)

[Claims] 1. A magnetic core formed of a ferrite material or the like, which is used for electronic parts such as a chip inductor by winding a conductive wire around the outer periphery thereof, and a resin material or the like is provided in a convex outward ridgeline region of the magnetic core. A magnetic core for electronic parts, which is formed with a protruding arc-shaped insulating part. 2. The magnetic core for electronic parts according to claim 1, wherein at least a part of the outer periphery is covered with a thin insulating layer such as a resin material. 3. The unevenness of the outer surface of the insulating layer is from 10 to 10.
The magnetic core for electronic parts according to claim 1, wherein a resin material having an unevenness of 100 μm is formed. 4. The magnetic core for an electronic component according to claim 1, wherein a convex arcuate insulating portion made of a resin material or the like is formed in a convex ridgeline region. 5. The magnetic core for an electronic component according to claim 1, wherein an insulating portion having a concave portion and a thin portion made of a resin material or the like is formed on the outer periphery.