JPH0451446Y2 - - Google Patents

Description

[Detailed description of the invention] (3-1) Industrial application field The present invention relates to a coil bobbin, and in particular to a coil bobbin that is conveniently used when mounted on a printed circuit board used for wiring small wireless devices, etc. .

(3-2) Conventional technology Printed circuit boards are often used in small wireless devices to simplify the complicated wiring work, but the coil bobbins used for inductance elements mounted on these devices are conventionally The one shown in Figure 6 (A is a plan view, B is a front view) was used. That is, in the figure, a coil bobbin 1 includes a main body 2, a terminal extraction portion 3, and the like.
The main body 2 consists of a core mounting part 2A and a winding part 2B, and two cores 11A and 11B are mounted on the core mounting part 2A. Further, a winding (not shown) is provided in the winding portion 2B of the winding. A plurality of terminal pins 4 (six in the figure) are attached to the terminal take-out portion 3, and the ends 5 of the windings are tied to the terminal pins. Main body 2 and terminal extraction part 3 of this coil bobbin
Both are made of insulating material, and both are usually integrally molded together with the terminal pin 4.

However, with the conventional coil bobbin described above, the work of tying the end of the winding is troublesome and time-consuming.
Further, as described above, such a coil is often used by being attached to a printed circuit board, but it has the disadvantage that the mounting area of the printed circuit board becomes large.

(3-3) Problems to be solved by the invention This invention aims to solve the above-mentioned drawbacks of the conventional coil bobbin and provide a coil bobbin that is easy to assemble and has a small mounting area on a printed circuit board. .

(3-4) Means for solving the problems and their effects The present invention has a main body consisting of a core mounting part and a winding part, and a terminal extraction part, and is molded from an insulating material. The above-mentioned problems are solved by making the coil bobbin have the following structure. That is, the terminal extraction part is provided with a plurality of grooves, and each groove has a shape consisting of a columnar body with a U-shaped cross section and a flange-shaped body perpendicular to the columnar body, and a conductive spring is installed in the groove. It is characterized by a metal fitting that is molded from wood and whose inner surface is solder-plated.

In this way, by pushing the end of the winding into the U-shaped groove of this metal fitting and soldering, the end of the winding can be firmly attached to the terminal extraction part, and this coil bobbin can be printed. By placing it on the board, attaching the flange-like body of the metal fitting to the wiring part of the printed circuit board, and soldering, etc., the winding of the coil and the wiring part of the printed circuit board can be firmly connected. . These operations are extremely simple compared to conventional ones and can be easily mechanized. Furthermore, the mounting area for the printed circuit board can be reduced compared to conventional ones.

If the U-shaped cross section of this metal fitting is made into a so-called Kinchak shape, in which the width of the open end is narrower than the other part, the connection between the metal fitting and the end of the winding will be ensured, and the metal fitting will Depending on the usage, the flange-like body may be attached to both sides or one side of the columnar body, or in the case of one side, it can be attached only to the half circumference thereof. Further, it is desirable that the bottom of the U-shaped cross section of the metal fitting be formed into an arc with a radius of curvature as large as possible, and preferably the radius of curvature should be half or more of the width of the other portion. Further, the height of the metal fitting is preferably higher, and is preferably greater than the thickness of the insulating material of the terminal extraction portion.

(3-5) Examples Examples of the present invention will be described below based on the drawings. FIG. 1 is a diagram illustrating a coil bobbin according to the present invention, in which A is a plan view and B is a front view.
In the figure, a coil bobbin 1 consists of a main body 2 and a terminal extraction part 6. Main body 2 is core attachment part 2
A and a winding part 2B of the winding, and its shape and structure are the same as those of the conventional one. In addition, the core attachment part has two cores 11A and 11.
It is also similar to the conventional one that B is attached and a winding (not shown) is applied to the winding portion of the winding.

FIG. 2 is an exploded perspective view showing an enlarged view of one side of the terminal extraction portion 6 (please note that the scales have been changed in various ways in the following figures for ease of understanding). In the same figure, a plurality of grooves 6A are provided in the terminal extraction part 6 (three in the illustrated case, six in total), and both the main body 2 and the terminal extraction part 6 are made of insulating material. It is usually molded in one piece. Each groove 6A has a metal fitting 7.
is fitted. The metal fitting is molded from a conductive spring material such as phosphor bronze, and its inner surface is solder-plated.

The metal fitting 7 consists of a columnar body 7A having a U-shaped cross section and a flange-like body 7B perpendicular to the columnar body 7A. Third
Figures A to F are diagrams illustrating various shapes of metal fittings used in the coil bobbin according to the present invention. In the figure, A is a diagram showing only a cross section of the columnar body 7A of the first example of the metal fitting. In this example, the width of the U-shaped open end 7C of the cross section of the columnar body is narrower than the other portions. It has a so-called cylindrical shape, and has the characteristic that when the winding end 5 is inserted into it, it is firmly fixed (see Fig. 4).

B (top view), C (front view), D (top view), and E (front view) are views showing the second and third examples, respectively. That is, in the second example, the flange-like body 7B is formed at both ends of the columnar body 7A, and in the third example, the flange-like body 7B is formed only at the half circumference of one end. These second and third examples, as well as those in which a flange-like body is formed around the entire circumference of one end (see Figure 2), etc., can be adjusted according to the shape and structure of the printed circuit board, etc. that is the other party of the wiring. It can be used conveniently.

Figure F shows a desirable shape of the bottom of the U-shaped cross section of the columnar body 7A. In other words, it is desired that the radius of curvature R of this bottom part is as large as possible,
If possible, it is desirable that R be at least 1/2 of the width L of the other portion.

The height H of the columnar body 7A of the metal fitting is preferably as large as possible, and it is desirable that H≧L with respect to the thickness T of the insulating material of the terminal extraction portion (see FIG. 2).

4 and 5 are diagrams showing a method of attaching the winding end portion 5 to the terminal extraction portion 6 and a method of attaching the coil bobbin 1 to a printed circuit board or the like. That is, the winding end 5 is inserted into the inner surface of the columnar body of the metal fitting 7 of the terminal extraction part 6 and fixed by soldering (Fig. 4), and then the tip 5A of the winding end is cut off, and the metal fitting 7 is inserted into the inner surface of the columnar body. Connect the flange part 7B to a printed circuit board, etc. 1
The coil bobbin 1 can be attached to the substrate 12 by soldering or other methods by bringing it into contact with the surface of the coil bobbin 2 (FIG. 5). Since this method is an extremely simple operation, it is possible to mechanize the entire process, reducing assembly man-hours and improving product yield. Also the fifth
As is clear from comparing Figure 6 with Figure 6,
Compared to conventional devices, the mounting area on printed circuit boards and the like is smaller, and it can greatly contribute to the miniaturization of wireless devices and the like.

(3-6) Effects of the invention This invention uses measures such as providing a groove in the terminal extraction part of the coil bobbin, fitting a metal fitting made of conductive spring material into the groove, and attaching the winding end to it. In this way, it is possible to simplify the assembly work of the coil bobbin and enable mechanization, thereby reducing the number of assembly steps, improving the product yield, reducing the cost, and reducing the mounting area for printed circuit boards, etc. Therefore, it has the excellent effect of contributing to miniaturization of wireless equipment and the like.

[Brief explanation of the drawing]

1 is a diagram illustrating a coil bobbin according to the present invention, in which A is a plan view, B is a front view, FIG. 2 is an exploded perspective view showing an enlarged view of one side of the terminal extraction portion 6, and FIGS. Figures 4 and 5 are diagrams illustrating various shapes of metal fittings used in the coil bobbin according to the present invention, and show how to attach the winding end 5 to the terminal extraction part 6 and how to attach the coil bobbin 1 to a printed circuit board, etc. FIG. 6 is a diagram illustrating a conventionally used coil bobbin, in which A is a plan view and B is a front view. DESCRIPTION OF SYMBOLS 1...Coil bobbin, 2...Main body, 2A...Core attachment part, 2B...Winding part, 3...Terminal extraction part, 4...Terminal pin, 5...Winding end part, 6
...Terminal extraction part, 6A...Groove, 7...Metal fitting, 7
A... Column body, 7B... Flange shaped part, 11A,
11B...core, 12...printed circuit board, etc., R,
L, H, T... dimensions.

Claims (1)

[Claims for Utility Model Registration] (1) In a coil bobbin molded from an insulating material, the coil bobbin has a main body consisting of a core attachment part and a winding part, and a terminal extraction part, and the terminal extraction part is provided with a plurality of grooves, each groove has a shape consisting of a columnar body with a U-shaped cross section and a flange-like body perpendicular to the columnar body, and is molded from a conductive spring material and has a groove on the inner surface. A coil bobbin characterized by a solder-plated metal fitting fitted into the coil bobbin. (2) The coil bobbin according to claim 1, wherein the width of the open end of the U-shaped cross section of the columnar body of the metal fitting is narrower than other parts. (3) The coil bobbin according to claim 1, wherein the flange-like body of the metal fitting is formed only at one end of the columnar body. (4) The coil bobbin according to claim 1, wherein the flange-like body of the metal fitting is formed at both ends of a columnar body. (5) The coil bobbin according to claim 3, wherein the flange-like body of the metal fitting is formed only half around one end of the columnar body. (6) Utility model registration claim 1, wherein the metal fitting is characterized in that the bottom of the U-shaped cross section of the columnar body consists of a circular arc having a radius of curvature larger than half the width of the other part. Coil bobbin described in. (7) The coil bobbin according to claim 1, wherein the height of the columnar body of the metal fitting is greater than the thickness of the insulating material of the terminal extraction portion of the coil bobbin.