JPH0584654B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a high frequency coil with a lead wire used in various electronic devices.

BACKGROUND OF THE INVENTION In recent years, electronic devices have become more lightweight, thinner, and smaller, and there is a strong demand for electronic components used in these devices to be smaller, cheaper, more efficient, and of higher quality. In the field of electronic components, even more miniaturized high frequency coils with lead wires have come to be provided.

Hereinafter, the above-mentioned conventional high frequency coil with lead wire will be explained with reference to the drawings.

FIG. 3 shows a cross-sectional view of a conventional high-frequency coil with lead wires. In the figure, 9 is a col part, 10 is a core part, 11 is an external lead wire, 12 is a coil end, 13 is a fixing part between the core part 10 and external lead wire 11, 14 is an exterior coating part, and 15 is a coil Part 9 and external lead wire 11
This is a connection part that is electrically connected by soldering or welding.

The operation of the high frequency coil with lead wire constructed as above will be explained below.

First, when the conventional high frequency coil with lead wire shown in FIG. 3 is used in an electronic device, the external lead wire must be bent 90 degrees as shown in FIG. 3 so that it can be inserted into a printed circuit board. Although the conventional high-frequency coil with lead wire shown in Figure 3 covers the coil end and the external lead wire connection part (soldering or welding, etc.) with a coil protective coating, it is bent or printed on electronic equipment, etc. When inserting the board, a large stress is applied to the end of the coil.
Accidents of disconnection of high-frequency coils frequently occur.

Problems to be Solved by the Invention However, in the above configuration, in order to prevent this disconnection accident, the bending part of the external lead wire should be placed at a distance from the connection part between the coil end and the lead wire to an extent that no stress is transmitted. However, there is a problem in that it cannot satisfy the recent demands for lighter, thinner, smaller, cheaper, and higher performance.

In view of the above-mentioned drawbacks, the present invention provides a high-frequency coil with a lead wire that is inexpensive and free from disconnection accidents without increasing the shape or cost.

Means for Solving the Problems In order to achieve this object, the high frequency coil with a lead wire of the present invention has a coil end that is connected once between the grooved part provided in the pot of the core part and the external lead wire. This is a rewind of the above.

Function With this configuration, the connection part of the external lead wire and the core groove cut part are connected by the ends of three or more coils, which reduces stress when processing the external lead wire or inserting the printed circuit board. Even if the coil ends are damaged, disconnection accidents at the ends of the coil can be largely prevented.

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a sectional view of a high frequency coil with lead wires in an embodiment of the present invention. In Figure 1, 1
is a coil part, 2 is a drum-shaped core part, 3 is an external lead wire, 4 is a repeated (folded) part of the coil end, 5 is a core part 2 and an external lead wire 3
6 is an exterior coating portion, 7 is a connection portion between the coil portion 1 and the external lead wire 3, and 8 is a groove cut portion provided along the circumference on the circumferential surface of the brim of the core portion 2. be. That is, the coil portion 1 is provided by winding a wire in the winding groove of the core portion 2, and the end of the coil portion 1 is wound at least once around the groove cut portion 8 provided in the brim of the core portion 2, and then further The connection to the external lead wire 3 is made by hooking the terminal on the external lead wire 3 and repeating the process between the groove cut portion 8 and the external lead wire 3 one or more times.

Figure 2 shows the number of repetitions when the end of the coil shown in Figure 1 is repeatedly (folded) once or more, and the disconnection of the end of the coil when the external lead wire is bent 90 degrees. It is a diagram comparing failures with a case where repeated rewinding is not performed (horizontal axis O in the figure). As is clear in Figure 2, when the coil end is repeatedly wound between the external lead wire and the external lead wire, the external lead wire is more than 2.5 times larger than when the coil end is not repeatedly wound (horizontal axis O in Figure 2). It can be seen that the number of 90° bends of the line can be obtained.

Effects of the Invention As described above, the present invention enables the coil end to be repeatedly (folded) between the outer lead wire electrically connected to the coil end and the grooved portion of the core.
By rewinding, it is possible to prevent disconnection accidents without increasing the size of the coil or increasing costs, and it is extremely advantageous in improving the quality of high-frequency coils with lead wires, which has great practical value. It is what it is.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of a high-frequency coil according to an embodiment of the present invention, Fig. 2 is a comparison diagram showing the effect of preventing wire breakage at the coil end due to the number of repeated windings of the coil end in the same coil, and Fig. 3 is a cross-sectional view of a conventional high-frequency coil. DESCRIPTION OF SYMBOLS 1... Coil part, 2... Core part, 3... External lead wire, 4... Repetition part, 8... Grooving part.

Claims (1)

[Claims] 1. A grooved part is provided along the circumference of the brim of the drum-shaped core part, the end of the coil is wound around this grooved part at least once, and this end is further pulled out to the outside and connected to the lead wire and the grooved part of the core part. A high-frequency coil that is repeatedly wound and connected one or more times.