JPH05267088A - Connecting method for lead of winding component - Google Patents

Abstract

PURPOSE:To obtain a method for connecting a lead without using solder to be continuously processed on a lead frame. CONSTITUTION:Tongue pieces 14 sharpened at its end are formed at part of a terminal 12 of a lead frame 10, electrodes 40 are respectively opposed to the pieces 14 in which leads 32 of a coil 30 are wound, a high voltage is applied to the electrodes 40 to discharge to the pieces 14 thereby to melt the ends of the pieces 14 to weld the leads 32 to the pieces 14. Thus, excellent connecting states are obtained to simplify the steps of connecting the leads, to easily automate it and to improve productivity.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a winding component such as a coil and a transformer, and more particularly to a method for connecting a coil lead and a terminal in a manufacturing process using a lead frame.

[0002]

2. Description of the Related Art A bobbin is fixed to a lead frame at a predetermined interval, and solder is conventionally used to connect the lead of a coil wound around the bobbin to a terminal portion formed on the lead frame. A laser or the like is used as a heat source for melting the solder. However, the laser device is expensive, and at the time of soldering, vaporized flux adheres to the condenser lens of the laser to cause soldering failure, and cleaning of the lens becomes necessary. was there. In addition, there is a drawback that the vicinity of the root of the soldered lead becomes thin due to a so-called solder cracking phenomenon in which copper diffuses into the solder alloy, and the wire is easily broken.

[0003]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a highly productive lead connecting method which can be continuously processed on a lead frame and does not use solder.

[0004]

According to the present invention, a tongue piece having a sharp tip is formed on a terminal portion provided on a lead frame, and a coil lead is wound around the tongue piece, and then the tip portion of the tongue piece is removed. It is characterized by a method of connecting leads of a winding component in which the leads are melted and the leads are welded to the tip of the tongue.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A lead connecting method for a winding component according to the present invention will be described with reference to the drawings. Figure 1 is a lead frame
10 shows a part of the manufacturing process using 10, in the lead frame 10 having a large number of terminal portions 12 formed, bobbin 20 made of synthetic resin is insert-molded on the terminal portions 12 at regular intervals. .. As is apparent from FIG. 2, the terminal portion 12 is provided with a tongue piece 14 formed by bending a protrusion formed on the side surface and protruding upward, and the tip thereof is sharply pointed. Further, the connecting strip 16 of the lead frame is provided with a protruding piece 18 cut and raised at a position corresponding to each terminal portion 12.

In this way, the coil 30 is wound around the bobbin 20 fixed to the lead frame 10. The plurality of leads 32 of the coil 30 are wound around the tongue piece 14 of the corresponding terminal portion 12 several times, and then wound once or twice around the projecting piece 18 provided on the connecting band 16 of the lead frame, and then another projecting piece. After being wound around the piece 18 and wound around the tongue piece 14 of the terminal portion 12 of the adjacent winding component several times, the coil 30 is wound around the bobbin 20. Then, this operation is sequentially repeated to continuously wind the plurality of winding components.

Next, as shown in FIG. 1, the electrodes 40 are arranged at two positions, and the lead frame 10 is intermittently moved in the direction of the arrow so that the electrodes 40 and the tongue piece 14 closely face each other as shown in FIG. Let
Then, a high voltage of several kV is applied to the electrode 40 to cause discharge between the electrode 40 and the tongue piece 14, and plasma energy is generated at the tip of the tongue piece 14. Since the electric charge is concentrated on the tongue piece 14 having a sharp tip and plasma energy is efficiently generated, the tip locally melts and becomes round as shown in FIG.
Are welded to the tip of the tongue 14.

After that, the lead 32 extending from the tongue piece 14 toward the protruding piece 18 is pressed from above with a metal rod or the like (not shown) to make it strongly tense, and is cut from the base of the tongue piece 14, and the terminal portion 12 is fixed. Separated from the connecting band 16 of the lead frame 10, individual winding parts can be obtained. Needless to say, the present invention can be applied to a winding component in which the bobbin 20 is made of a magnetic material, or a winding component in which a magnetic core (bobbin) is fixed to a base made of synthetic resin.

[0009]

According to the lead connecting method of the present invention, a lead is directly welded to a terminal by locally heating and melting a part of the terminal portion without using solder. Therefore, a good connection state can be obtained without the soldering of the lead connecting portion and thinning. In addition, since no flux is used, the conventional washing process after soldering is not required, which simplifies the process and facilitates the automation of the connection process, thus improving productivity.

[Brief description of drawings]

FIG. 1 is a plan view of a manufacturing process according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is an enlarged perspective view of a main part after welding.

[Explanation of symbols]

 10 lead frame 12 terminal part 14 tongue piece 20 bobbin 30 coil 32 lead 40 electrode

Claims (1)

[Claims] 1. A lead connecting method for winding parts, comprising: fixing a bobbin to a lead frame having a large number of terminal portions at predetermined intervals, and then connecting the leads of a coil wound around the bobbin to the terminal portion. By forming a tongue piece with a sharp tip in a part of the part, facing the electrode to the tongue piece around which the coil lead is wound, applying a high voltage to the electrode and discharging between the tongue piece, A method for connecting leads of a winding component, characterized in that a tip of a tongue is melted and a lead is welded to the tongue.