JPH10303036A - Molded coil and electronic component - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve stability in mounting by manufacturing a molded body by resin molding a coil whereupon a rectangular copper wire is vertically wound by using polymeric resin composition and providing a recessed part on the molded body for fitting the terminal of the coil. SOLUTION: A vertically wound coil whereupon a rectangular copper wire is vertically wound and a supporting fixture 4 having a U-shaped cross section are resin-molded at the same time by using epoxy resin so as to manufacture a molded body 1. The supporting fixture 4 is molded so as to have its side of the U shape contact the bottom plane of the molded body 1. The molded body 1 is provided with a core mounting hole 7 and a core fitting groove 8. On the bottom plane of the molded body 1, recessed parts 2 and protruding parts 3 are provided. Then, the terminal of the vertically wound coil is bent a long the surface of the molded body 1, the leading edge of the terminal is fitted in the recessed part 2 and pressed between the protruding parts 3, and a terminal part 6 is provided. Then, a magnetic core is incorporated in the molded body 1 and the molded body is mounted on a printed board as an inductor.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to various power supply devices,
The present invention relates to a transformer and an inductor used for video equipment, industrial equipment, communication, information-related equipment, and the like, and particularly to a molded coil suitable for use as an electronic component of a surface-mounted transformer and an inductor.

[0002]

2. Description of the Related Art A so-called vertical winding coil in which a long side of a rectangular conducting wire (a copper wire or an aluminum wire coated with insulation) having a rectangular cross section is wound so as to be perpendicular to a winding axis, is called a space factor of the coil. Therefore, it is used for transformers and inductors used at high frequencies because of its high stability and small stray capacitance.

[0003] Fig. 2 shows an example of a conventional molded coil formed by molding a resin using a polymer resin composition for a vertically wound coil, which is used as an inductor.

As shown in FIG. 2, a conventional molded coil is formed by molding a resin into a vertical coil 5 using a polymer resin composition to form a molded body 11, and bending the terminals of the vertical coil 5 to form a terminal. It is only the part 6. The mold body 11 has a core mounting hole 7 and a core fitting groove 8.

In a conventional inductor using a vertically wound coil formed by resin molding, a magnetic core 9 is incorporated in a mold body 11 in the direction of an arrow 20 and a so-called I-shaped core (not shown) having a rectangular parallelepiped shape is mounted thereon. , And a magnetic circuit.

A conventional transformer using a vertically wound coil formed of resin is different from an inductor in that two or more independent coils are integrally formed of resin in an adjacent state via an insulator. Things.

[0007]

A conventional transformer and inductor using a vertically wound coil with a mold,
When mounted on a substrate or the like, the lower surface of the molded body 11 was raised by the thickness of the terminal portion and the gap between the lower surface and the terminal portion.

Further, when forming the terminal portion 6 by bending the terminal along the surface of the molded body, it cannot be expected that the terminal portion 6 is bent at a perfect right angle.
Since it was not fixed to the lower surface of No. 1, the stability at the time of attachment could not be said to be sufficient.

Furthermore, in the case of the inductor, since it is supported at two points, it cannot be said that the strength against impact and vibration is sufficient.

Although there is a method of increasing the number of support points by bonding or the like, there is a problem that the number of steps is increased and the cost is increased.

[0011] At the same time, there is a continuing severe demand for reducing the height of transformers and inductors to be mounted in order to reduce the size of equipment.

An object of the present invention is to provide a low-profile, low-cost and inexpensive electronic component for a molded coil, a transformer and an inductor, which has good stability at the time of mounting and is resistant to shock and vibration. .

[0013]

According to the present invention, there is provided a coil for which a rectangular copper wire is vertically wound, and a resin molding is performed by using a polymer resin composition to form a molded body. Is a molded coil provided with a concave portion into which a terminal portion of the coil is fitted.

Further, in the above-described molded coil, the concave portion is provided with a protrusion for gripping a terminal portion of the coil.

Further, the present invention is the above-described molded coil, wherein the concave portion is provided on a lower surface of the molded body.

Further, the present invention is a transformer in which a magnetic core is incorporated in the above-described molded coil.

Further, the present invention is the above-described molded coil, wherein the molded body is provided with a plurality of support fittings for supporting the molded coil.

Further, according to the present invention, the support bracket is made of a solderable material, has a U-shaped cross section, and is provided such that the bottom side of the U-shape contacts the lower surface of the mold body. It is the above-mentioned molded coil.

Further, the present invention is an inductor in which a magnetic core is incorporated in the above-mentioned molded coil.

[0020]

FIG. 1 is a view showing an embodiment of the present invention. FIG. 1 (a) is a perspective view of a molded coil for an inductor, and FIG. 1 (b) is a front view of the molded coil. FIG. 1C is a bottom view of the molded coil, and FIG.
FIG. 4 is a perspective view showing a shape of a support fitting provided on a mold body.

The present invention will be described below using an inductor as an example.

Thickness of 0.1% coated with modified epoxy acrylic
A rectangular copper wire having a width of 5 mm and a width of 4 mm was vertically wound four turns with an inner diameter of 7 mm (not shown). As shown in FIG. 1, the vertically wound coil and the support bracket 4 having a U-shaped cross section were simultaneously resin-molded using an epoxy resin to produce a molded body 1. The bottom of the U-shape of the support fitting 4 was in contact with the lower surface of the mold body 1. The mold body 1 is provided with a core mounting hole 7 and a core fitting groove 8.

A recess 2 and a projection 3 are provided on the lower surface of the mold 1. The width of the recess 2 is 4.2 mm and the depth is 0.2 mm.
It was 5 mm. The width of the projection 3 was 1 mm, and the interval between the tips of the projections 3 was 3.8 mm, which was slightly smaller than the width of the copper wire of 4 mm. The supporting bracket 4 has a thickness of 0.4 m.
It is formed by pressing a copper strip having a width of 2 mm and a width of 2 mm.

The dimensions of the mold 1 were 16 mm in width, 18 mm in length, and 4 mm in thickness. The diameter of the core mounting hole 7 is 6 mm, the width of the core fitting groove 8 is 13 mm, and the depth is 1 mm.
I made it.

The terminal of the vertical coil was bent along the surface of the molded body 1, the tip of the terminal was fitted into the recess 2, and the terminal was press-fitted between the projections 3 to form the terminal 6.
The terminal part 6 was fixed to the mold body 1 by being gripped by the projection part 3.

Next, a magnetic core was incorporated into the molded body 1 to form an inductor, and the inductor was mounted on a printed circuit board.

When the terminal was bent, a slight twist was generated. However, the terminal 6 was fitted into the recess 2 and held or fixed by the projection 3, and
In addition, since it was supported at four points, the stability at the time of attachment was good, and it was strong against shock and vibration.

Also, as much as the terminal portion 6 is fitted into the concave portion 2,
The height can be reduced, the height can be reduced, and bonding and the like are not required, and inexpensive molded coils and inductors can be obtained.

The molded coil for the transformer is such that the vertical coil used for the inductor is a secondary coil and has a nominal diameter of 0.2.
A 15 mm diameter PEW wire is wound 15 turns to form a primary coil,
The primary coil and the secondary coil were placed adjacent to each other with an insulating sheet interposed therebetween, and were integrally resin-molded together with the support fitting 4 to obtain a molded body. Further, the lead wire of the primary coil was soldered to the support fitting 4 to form a primary terminal. Other steps are
Similar to an inductor.

The same effect as that of the inductor was obtained for the transformer.

[0031]

According to the present invention, it is possible to obtain low-cost, low-cost, low-cost molded coil, transformer, and inductor electronic components having good stability at the time of mounting and being resistant to shock and vibration.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing an embodiment of the present invention.
1A is a perspective view of a molded coil, FIG. 1B is a front view of the molded coil, FIG. 1C is a bottom view of the molded coil, and FIG. The perspective view which shows a shape.

FIG. 2 is a perspective view of an example of a conventional molded coil in which the example is used for an inductor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1, 11 Mold body 2 Concavity 3 Projection part 4 Support bracket 5 Vertical coil 6 Terminal part 7 (For core attachment) Hole 8 (Core fitting) groove 9 Magnetic core 20 Arrow

Claims (6)

[Claims] A coil formed by vertically winding a rectangular copper wire is subjected to resin molding using a polymer resin composition to form a molded body,
The molded coil has a concave portion into which a terminal portion of the coil is fitted. 2. The molded coil according to claim 1, wherein the recess is provided with a protrusion for gripping a terminal of the coil. 3. The mold coil according to claim 1, wherein the recess is provided on a lower surface of the mold body. 4. The molded coil according to claim 1, wherein the molded body is provided with a plurality of support fittings for supporting the molded coil. 5. The support bracket is made of a solderable material, has a U-shaped cross section, and is provided such that a bottom side of the U-shape contacts a lower surface of the mold body. The molded coil according to claim 4, wherein 6. An electronic component, wherein a magnetic core is incorporated in the molded coil according to claim 1.