JPS645449B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of manufacturing a chip-shaped coil component.

For example, as shown in FIG. 1, a conventional chip-shaped coil component has electrodes 7 on protrusions 3, 4, 5, and 6 formed on one side of a flange 2 of a core 1.
8, 9, and 10 were attached, and a plurality of terminal portions of the coil 11 were wound around the protrusions 3, 4, 5, and 6, respectively, and were connected to the respective electrodes by soldering. For coil parts with such a configuration, it is difficult to automate the winding of the coil end, and furthermore, after soldering, the solder swells up on the electrodes, so when placed on a printed circuit board, it is difficult to automate the winding process. The problem was that it became unstable.

The present invention has been made in view of these points, and provides a method for manufacturing chip-shaped coil components that facilitates and automates the processing of coil terminal parts and that does not cause excess solder to bulge up. This is what I am trying to do.

An embodiment of the present invention will be described in detail below with reference to the drawings.

First, a core 21 as shown in FIG. 2 is prepared. This core 21 is made of a magnetic material such as ferrite or an appropriate insulating material, and has flanges 22 and 23 at both ends of the winding core.
3, protrusions 24, 25, 2 protruding in the plane direction thereof.
6, 27 are formed, and electrodes 28, 29, 30, made of a suitable conductive material such as Ag are formed on the back side thereof.
31 is attached. Core 2 like this
The coil 32 is wound around the winding core by holding one flange 22 of the coil 1 in the chuck of an automatic winding machine (not shown) and rotating the core 21. The coil 32 in this embodiment has two coils stacked and wound around a winding core. Next, the end portions 33, 34, 35, and 36 of the coil 32 wound in this manner are pulled out toward the protrusions 24, 25, 26, and 27 of the flange 23, and the electrodes 28, 29, and 30 and 31 in the same direction. If the terminal part protrudes from the protrusion after bending,
Press the cutter against the protrusion and cut off the excess. After that, flux is applied to the electrode surface, the flange 23 is immersed in molten solder, and the electrodes 28, 2
9, 30, 31 and terminal parts 33, 34, 3 of the coil
Apply solder to 5 and 36. When the electrode is lifted out of the molten solder, there will be excess solder hanging on the electrode surface due to surface tension. String-like materials such as wool, kite string, etc.
The dripping solder is removed by rubbing the electrode surface against a wiping member made of a material with poor thermal conductivity, or by rubbing the wiping member against the electrode surface. The rubbing direction must be applied from above the end of the coil along the bending direction. In this way, when the excess solder on the electrode surface is removed by wiping the end of the coil along the bending direction with the wiping member, only a small amount of solder remains on the electrode surface. No convex portions are formed. Further, by this rubbing, each end portion of the coil 32 is securely fixed in contact with the electrode surface.

Since the coil component in the above embodiment is a transformer constructed by winding two coils around the winding core, there are four coil terminals, as shown in Fig. 3. It goes without saying that the same manufacturing method can also be applied to a coil component in which only one coil is wound. In the coil component shown in the third figure, a coil 40 is wound around a core 39 having flanges 37 and 38 formed at both ends of the winding core, and a pair of electrodes 41 are attached to both end portions of the back surface of one flange 38. , 42, the coil terminal portions 43, 44 are bent and soldered. The part of the illustrated flange 38 to which the electrode is attached is formed into a narrow shape, and this part serves as a guide to facilitate the drawing out of the coil terminal parts 43 and 44 to the back side of the flange. , it is not necessarily necessary to have such a shape.

Note that the method of winding the coil is not limited to the method of rotating the core as described above, but it is also possible to adopt a method of fixing the core and winding the wire.
In addition, if the insulation coating material of the wire constituting the coil is a heat-melting material such as polyurethane resin,
Since the coating material is removed by heat at the same time as soldering is applied to the coil terminals, there is no need to provide a special process for removing the coating material from the terminal sections. However, if the insulation coating material is not heat-fusible, soldering Needless to say, a separate step of removing the coating material is required before application. Moreover, although the shape of the core is shown as having a rectangular flange in each case, the shape of the flange may be round or the like. Furthermore, if the flange on which the coil end is attached is made of a magnetic material such as ferrite, it should have a structure in which an insulating plate is bonded together, and an electrode is provided at the end of this insulating plate to terminate the coil. The electrode may be fixed to the electrode by soldering.

As explained above, the manufacturing method of the present invention includes the steps of winding a coil around a core having a flange having at least one pair of electrodes attached to the bottom surface, and winding a plurality of terminal portions of the coil along the electrodes on the bottom surface of the flange. A process of bending in the same direction, a process of applying molten solder to the bent terminal part and the electrode, and a process of applying molten solder to the terminal part of the coil using a wiping member to remove excess solder from the electrode surface before the applied molten solder solidifies. This method involves the process of removing the coil by wiping it from above along the bending direction and fixing the terminal end along the electrode surface, eliminating the work of winding the coil end, which was a bottleneck for automation. By removing excess solder with a wiping member, solder does not bulge and can be stably placed on a printed circuit board. In addition, since there is a process of removing the coil with a wiping member, the bent end can be pressed against the electrode surface by the wiping member, without having to wrap and fix the coil end as in the conventional method. It has various excellent effects such as being able to reliably connect to the electrode surface.

[Brief explanation of drawings]

Figure 1 is a perspective view of a conventional chip-shaped coil component.
2 and 3 are perspective views of a chip-shaped coil component according to the manufacturing method of the present invention. 21, 39... Core, 22, 23, 37, 38
... Flange, 24, 25, 26, 27 ... Protrusion, 28, 29, 30, 31, 41, 42 ... Electrode, 32, 40 ... Coil, 33, 34, 35,
36, 43, 44...terminal section.

Claims (1)

[Scope of Claims] 1. A method for manufacturing a chip-shaped coil component, comprising the following steps a) to d). a Step of winding a coil around a core having a flange with at least one pair of electrodes attached to the bottom surface. b. A process of bending the multiple end portions of the coil in the same direction along the electrodes on the bottom of the flange. c. A step of applying molten solder to the bent end portion and the electrode. d Before the applied molten solder solidifies, remove the excess solder on the electrode surface by wiping it from above the terminal part of the coil along the bending direction with a wiping member, and then wipe the terminal part along the electrode surface. The process of fixation.