JP3623338B2 - Molded coil and electronic parts - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a transformer and an inductor used in various power supply equipment, video equipment, industrial equipment, communication, information-related equipment, and the like, and more particularly to a mold coil suitable for use in electronic components of surface mount transformers and inductors. It is.
[0002]
[Prior art]
A so-called vertical coil, in which a rectangular conductor (copper wire or aluminum wire with insulation coating) having a rectangular cross section is wound so that the long side is perpendicular to the winding axis, has a good space factor and is floating. Since the capacitance can be reduced, it is used in transformers and inductors used at high frequencies.
[0003]
FIG. 2 shows an example of using a conventional molded coil as a molded body by using a polymer resin composition for a longitudinally wound coil and molding the resin.
[0004]
As shown in FIG. 2, the conventional molded coil uses a polymer resin composition for the longitudinal coil 5 and resin-molds to form a molded body 11, and the terminals of the longitudinal coil 5 are bent and the terminal portion 6. It ’s just that. The mold body 11 has a core mounting hole 7 and a core fitting groove 8.
[0005]
A conventional inductor using a vertically-coiled resin-molded coil has a magnetic core 9 incorporated in a mold body 11 in the direction of an arrow 20 and a rectangular parallelepiped so-called I-type core (not shown) is placed on the magnetic circuit. Is configured.
[0006]
Unlike conventional inductors, transformers using vertically wound coils with resin molding are two or more independent coils that are integrally molded with an insulator in an adjacent state. .
[0007]
[Problems to be solved by the invention]
When a conventional transformer and inductor using a vertically wound coil that has been molded are attached to a substrate or the like, the lower surface of the molded body 11 is raised by the thickness of the terminal portion and the gap between the lower surface and the terminal portion.
[0008]
Further, when the terminal is bent along the surface of the mold body to form the terminal portion 6, it cannot be expected to be bent at a perfect right angle, and the terminal portion 6 is not fixed to the lower surface of the mold body 11. The stability at the time of installation was not sufficient.
[0009]
Furthermore, in the case of the inductor, since it was supported at two points, it could not be said that the strength against impact and vibration was sufficient.
[0010]
In addition, there is a method of increasing the support point by adhesion or the like, but there is a problem that the number of steps increases and the cost increases.
[0011]
At the same time, due to the miniaturization of equipment, the demands for lowering the height of transformers and inductors to be mounted continue to be severe.
[0012]
Accordingly, the problem to be solved by the present invention is to provide a low-profile and inexpensive electronic component such as a molded coil, a transformer, and an inductor, which have good stability at the time of mounting and are strong against impact and vibration.
[0014]
[Means for Solving the Problems]
In order to solve the above problems, the present invention provides a coil obtained by longitudinally winding a rectangular copper wire with a polymer resin composition to form a molded body, and the molded body includes terminal portions of the coil. the recess fitting provided in the concave portion is a motor Rudokoiru provided with projections for gripping the terminal portion of the coil.
[0015]
Moreover, this invention is said mold coil which provided the said recessed part in the lower surface of the said mold body.
[0016]
Furthermore, the present invention is a transformer in which a magnetic core is incorporated in the above-described molded coil.
[0017]
Moreover, this invention is said mold coil which provided the some support metal fitting which supports a mold coil in the said mold body.
[0018]
Further, according to the present invention, the support fitting is made of a solderable material, has a U-shaped cross section, and is provided so that a bottom of the U-shape is in contact with a lower surface of the mold body. It is a molded coil.
[0019]
Furthermore, the present invention is an inductor in which a magnetic core is incorporated in the above-described molded coil.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
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, FIG. 1 (b) is a front view of the molded coil, and FIG. 1 (c). Is a bottom view of the mold coil, and FIG. 1D is a perspective view showing the shape of the support fitting provided on the mold body.
[0021]
The present invention will be described below by taking an inductor as an example.
[0022]
A rectangular copper wire having a thickness of 0.5 mm and a width of 4 mm covered with the modified epoxy acrylic was vertically wound for 4 turns with an inner diameter of 7 mm (not shown). As shown in FIG. 1, the vertical winding coil and the U-shaped support metal fitting 4 having a U-shaped cross section were simultaneously molded with an epoxy resin to produce a molded body 1. The support metal fitting 4 was configured such that the bottom of the U-shape 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.
[0023]
On the lower surface of the mold body 1, a recess 2 and a protrusion 3 were provided. The width of the recess 2 was 4.2 mm and the depth was 0.5 mm. The width of the protrusion 3 was 1 mm, and the distance between the tips of the protrusion 3 was 3.8 mm, which was slightly smaller than the width of the copper wire 4 mm. The support metal fitting 4 is formed by pressing a copper strip having a thickness of 0.4 mm and a width of 2 mm into a U-shape.
[0024]
The dimensions of the mold body 1 were a width of 16 mm, a length of 18 mm, and a thickness of 4 mm. The diameter of the core mounting hole 7 was 6 mm, the width of the core fitting groove 8 was 13 mm, and the depth was 1 mm.
[0025]
The terminal of the longitudinally wound coil was bent along the surface of the molded body 1, the tip of the terminal was fitted into the recess 2, and press-fitted between the protrusions 3 to form the terminal portion 6. The terminal portion 6 was fixed to the mold body 1 by being gripped by the protruding portion 3.
[0026]
Next, a magnetic core was incorporated into the mold body 1 to form an inductor, and the inductor was attached to a printed board.
[0027]
When the terminal was bent, a slight twist occurred, but the terminal portion 6 was fitted into the concave portion 2 and held by the projection portion 3, that is, fixed, and further supported at four points together with the support fitting 4. Therefore, it was stable during installation and strong against shock and vibration.
[0028]
In addition, since the terminal portion 6 was fitted in the recess 2, the height was lowered, the height could be lowered, and no bonding or the like was required, and an inexpensive molded coil and inductor were obtained.
[0029]
For the transformer coil, the vertical coil used for the inductor is a secondary coil, and a PEW wire with a nominal diameter of 0.2 mmφ is wound for 15 turns to make a primary coil, and the primary coil and the secondary coil are made of an insulating sheet. Next, the resin was integrally molded together with the support fitting 4 to form a molded body. Also, the lead wire of the primary coil was soldered to the support fitting 4 to form a primary side terminal. Other processes are the same as those of the inductor.
[0030]
For the transformer, the same effect as the inductor was obtained.
[0031]
【The invention's effect】
According to the present invention, it is possible to obtain an electronic component such as a molded coil, a transformer, and an inductor that has good stability at the time of mounting, is resistant to shock and vibration, is low in profile, and is inexpensive.
[Brief description of the drawings]
FIG. 1 is an explanatory view showing an embodiment of the present invention, in which FIG. 1 (a) is a perspective view of a molded coil, FIG. 1 (b) is a front view of the molded coil, and FIG. The bottom view of a coil and FIG.1 (d) are perspective views which show the shape of the support metal fitting provided in the mold body.
FIG. 2 is a perspective view of an example of a conventional molded coil taking as an example an inductor.
[Explanation of symbols]
1, 11 Mold body 2 Recess 3 Protrusion 4 Support metal fitting 5 Vertical coil 6 Terminal 7 (Core mounting) Hole 8 (Core fitting) Groove 9 Magnetic core 20 Arrow

Claims (5)

A coil in which a rectangular copper wire is vertically wound is subjected to resin molding using a polymer resin composition to form a mold body, and the mold body is provided with a recess for fitting the terminal portion of the coil , features and to makes the chromophore at the distal end Rudokoiru in that a projecting portion for gripping the terminal portion of the coil. The molded coil according to claim 1 , wherein the concave portion is provided on a lower surface of the molded body. The mold coil according to claim 1 , wherein the mold body is provided with a plurality of support fittings for supporting the mold coil. The support bracket is made of solderable material, a shaped cross-section is U, claim 3, characterized in that the base of shape of the arc is provided in contact with the lower surface of the mold body The molded coil according to 1. An electronic component comprising a magnetic core incorporated in the molded coil according to claim 1 .

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