JPH118142A - Electronic component - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the generation of the defective dielectric strength or the like of an electronic component, by a method wherein in the electronic component formed by incorporating a longitudinal winding coil formed using a straight angle-conductor wire in a wire, insulators are respectively mounted between the inner peripheral part of the coil and the core and between the outer peripheral part of the coil and the core. SOLUTION: In an electronic component, such as a choke coil or a transformer, formed by incorporating a longitudinal winding coil 9 formed using a straight angle- conductive wire in a core, insulating films are respectively mounted between the central magnetic pole of the core and the inner peripheral part of the coil and between the return path of the core and the outer peripheral part of the coil to make an insulation on the core. The annular insulating film 6 is put in the inner peripheral part of the coil 9 in the direction shown by an arrow 24 to mount the film 6 to the coil 9, and the annular insulating film 7 is put in the outer peripheral part of the coil 9 in the direction shown by an arrow 25, in such a way as to align the positions of leads 8 with the positions of the grooves 5 to mount the film 7 to the core 9. The dielectric breakdown voltage of the electronic component is enhanced and the electronic component, such as the choke coil or the transformer, which has not a defective dielectric strength and is good in fraction nondefective, is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to various power supply devices,
The present invention relates to electronic components such as a choke coil and a transformer used in video equipment, audio equipment, industrial equipment, communication / information related equipment, and the like.

[0002]

2. Description of the Related Art Conventionally, a coil is formed by winding a rectangular conductor (a copper wire or an aluminum wire having an insulating coating) having a rectangular cross section so that a long side, that is, a width direction thereof is perpendicular to a winding axis. In electronic components such as chokes and transformers in which a wound coil is incorporated in a core, no special insulation is provided between the central magnetic pole of the core and the inner peripheral portion of the coil, and between the return path of the core and the outer peripheral portion of the coil. Was.

[0003]

As described above, in the above-mentioned conventional electronic components, since no special insulation is provided between the coil and the core, a withstand voltage failure or the like is likely to occur, and the failure rate is high. There was a problem that sometimes increased.

An object of the present invention is to provide an electronic component such as a choke coil and a transformer having a good yield without a dielectric strength failure.

[0005]

According to the present invention, there is provided an electronic component comprising a core formed by incorporating a vertically wound coil using a rectangular conductor into a core, between an inner peripheral portion of the vertically wound coil and the core, and
An electronic component having an insulator mounted between an outer peripheral portion of the vertical coil and the core.

Further, the present invention is the above electronic component, wherein the insulator is an insulating film made of a polymer composition.

Further, according to the present invention, the insulating film comprises:
The electronic component described above, which is rectangular and has notches provided at one or more locations above and below the edge of the insulating film at different positions on the long side.

Further, the present invention provides the insulating film,
The electronic component according to the above electronic device, wherein a notch is provided at an edge of a long side to pass a lead portion of one or more coils in upper and lower portions.

Further, the present invention is the above electronic component, wherein the insulating film is made of either a polyimide composition or a polyester composition.

[0010]

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electronic component such as a choke coil and a transformer in which a vertically wound coil is incorporated in a core, between a central magnetic pole of the core and an inner peripheral portion of the coil, and between a return path of the core and the coil. An insulating film is attached between the outer peripheral portions of the above to provide insulation.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is an explanatory view showing an insulating film and a vertical winding coil of the present embodiment, and FIG. 2 is an explanatory view showing an insulating film mounted on an inner peripheral portion of the vertical winding coil of the present embodiment. FIG. 3 is an explanatory view showing an insulating film attached to the outer peripheral portion of the vertical coil of the present embodiment, and FIG. 4 is an exploded explanatory view showing the configuration of the transformer of the present embodiment.

The vertically wound coil 9 used in the present embodiment was obtained by winding a rectangular copper wire of 0.3 mm × 4 mm coated with a modified epoxy acrylic resin for 7 turns with an inner diameter of 5.5 mm for 7 turns. The outer diameter of the vertically wound coil 9 was about 14 mm.

The annular insulating film 6 shown in FIG.
As shown in the figure, the thickness is 15 μm, the width is 2.5 mm, and the length is 20
The cut 2 and the cut 3 are combined so that the cut 2 and the cut 3 are provided vertically from the edge of the long side of the film 1 made of the polyimide composition having a length of 2 mm, and the cut 2 and the cut 3 are aligned. , Obtained by assembling into a ring.

Further, as shown in FIG. 3, the thickness is 25 μm,
Cuts 2 and cuts 3 are provided above and below the edge of the film 4 made of a rectangular polyester composition having a width of 2.5 mm and a length of 47 mm at different positions on the long side, and coil leads are formed above and below the long side of the film 4. The notch 5 through which the portion 8 passes was provided, and the assembly was performed in the same manner as described above to obtain the annular insulating film 7.

Then, as shown in FIG.
A ring-shaped insulating film 6 is inserted in the inner peripheral portion in the direction of arrow 24 and mounted. , In the direction of arrow 25.

In the transformer of this embodiment, as shown in FIG.
That is, insulating films 6 and 7 are attached between the inner and outer peripheral portions of the vertically wound coil 9 and the core 11 (arrows 24 and 25), the secondary coil 12 is insulated by the insulating sheet 13 and incorporated into the core 11, It is mounted on the base 14 and overlapped in the direction of arrow 23, and then integrated with the holder 15.
The secondary side coil has a nominal diameter of 0.2 mm PEW wire 21
Turn-wound coil.

The transformer obtained as described above has a breakdown voltage improved by 40% as compared with the conventional transformer, and a transformer having no withstand voltage defect and a low defect rate can be obtained.

In this embodiment, the description has been made with the transformer. However, even with a choke coil, the effect remains unchanged.

[0020]

According to the present invention, there is no dielectric strength failure,
Electronic parts such as a choke coil and a transformer having a good yield can be obtained.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing an insulating film and a vertically wound coil of the present embodiment.

FIG. 2 is an explanatory view showing an insulating film attached to an inner peripheral portion of the vertical coil of the embodiment.

FIG. 3 is an explanatory view showing an insulating film attached to an outer peripheral portion of the vertically wound coil according to the embodiment.

FIG. 4 is an exploded explanatory view showing the configuration of the transformer according to the embodiment.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 film (made of polyimide composition) 2, 3 cut 4 film (made of polyester composition) 5 notch 6, 7 (annular) insulating film 8 lead 9 vertical coil 11 core 12 (secondary side) Coil 13 Insulation sheet 14 Base 15 Holder 23, 24, 25 Arrow

Claims (5)

[Claims] 1. An electronic component having a vertically wound coil using a rectangular wire incorporated in a core, between an inner peripheral portion of the vertically wound coil and the core, and between an outer peripheral portion of the vertically wound coil and the core. An electronic component comprising an insulator. 2. The electronic component according to claim 1, wherein the insulator is an insulating film made of a polymer composition. 3. The insulating film has a rectangular shape, and each of the insulating films has a length one at a time from an edge of a different position on a long side of the insulating film.
3. A notch is provided at a position or more.
Electronic components as described. 4. The electronic component according to claim 2, wherein the insulating film is provided with cutouts at one or more long sides of the insulating film, through which leads of one or more coils at the top and bottom are passed. 5. The insulating film is a polyimide composition,
The electronic component according to any one of claims 2 to 4, wherein the electronic component is made of a polyester composition.