JPS5994492A - Method of producing chip-shaped coil part - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] The present invention relates to a method for manufacturing a chip-shaped coil component.

In a conventional chip-shaped coil component, for example, as shown in FIG. are attached, and the plurality of terminal portions of the coil 11 are connected to the projections 3.4.5.
6 and were connected to the respective electrodes by soldering.

Coil parts with such a configuration are difficult to automate the winding process of the end of the coil, and furthermore, after soldering, the solder bulges on the electrodes, so it is difficult to attach them to the printed circuit board. There was a problem in that it became unstable once it was placed.

The present invention has been made in view of these points, and provides a method for manufacturing chip-shaped coil components that facilitates and enables automation of 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.

The core 21 is made of a magnetic material such as ferrite or an appropriate insulating material, and has seven flanges 22, 23 at both ends of the winding core, and protrusions 24, 25, 26, 24, 25, 26, 24, 24, 25, 26, 24, 24, 24, 25, 26, 24, 24, 25, 26, 24, 24, 25, 26, 24, 24, 25, 25, 25, 26, 25, 25, 25, 25, 25, 25, 26 flanges are formed on one flange 23 of the flange 23, respectively. 27 are formed, and electrodes 28.
No. 29, 30, and 31 were attached.

One of the seven flanges 22 of the core 21 is held between a chuck of an automatic winding machine (not shown), and the coil 32 is wound around the winding core by rotating the core 21.

The coil 32 in this embodiment has two coils stacked and wound around a winding core. Next, each end portion 33.3 of the coil 32 wound in this manner is
4.35.36 7 Lunge 23 protrusion 24.25.26
．． 27 direction, and the electrodes 28. on the back of those protrusions.
29, 30, and 31 in the same direction. If the end part protrudes from the protrusion after bending, press a cutter against the protrusion and cut off the excess. After that, flux is applied to the electrode portions, and the flange 23 is immersed in the molten solder, and the electrodes 28, 29, 30.
31 and the end portions 33, 34, 35, and 36 of the coil. When the electrode is pulled out of the molten solder, there will be excess solder hanging down on the electrode due to surface tension, so before the solder hardens, it can be removed from the surface of cloth, leather, etc., or if it is taut. The electrode portion is rubbed against a string-like wiping member such as kite string, or the wiping member is rubbed against the electrode portion to remove the dripping solder. This rubbing direction needs to be carried out along the bending direction of the end portion of the coil. When the excess solder is removed in this way, only a small amount of solder remains on the electrode portion, so that no extra protrusions are formed. Further, by this rubbing, each end portion of the coil 32 is reliably connected in a state in which it is in contact with the electrode portion.

The coil component in the above embodiment has two parts in the winding core part of the core.
Since the transformer is constructed by winding several coils, there are four coil terminals, but as shown in Figure 3, there are also coil parts with only one coil wound. It goes without saying that similar manufacturing methods can be applied. In the coil component shown in the third figure, a coil 40 is wound around a core 39 having flanges 31 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. The coil end portions 43 and 44 are bent and soldered along .42. The portion of the illustrated flange 38 to which the electrode is attached is formed in a narrow shape, and there is no need for this portion to have a shape similar to that of the guide.

Note that the method of winding the coil is not limited to the method of rotating the core as described above, but it goes without saying that a method of fixing the core and winding the wire can also be adopted.

In addition, although the shape of the core is shown as having a rectangular flange in each case, the shape of the flange may be other shapes such as a round shape. Furthermore, if the flange on which the end of the coil is attached is made of magnetic material such as ferrite, it should have a structure in which insulating plates are bonded together, and electrodes can be provided at the ends of this insulating plate to coil the coil. The terminal portion may be soldered to the electrode.

As explained above, the manufacturing method of the present invention includes a step of winding a coil around a core having a flange having at least one pair of electrodes attached to the bottom surface, and a step 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. Since it includes the steps of bending in the same direction, applying solder to the bent end portion and the electrode, and removing excess solder with a wiping member before the applied solder solidifies, The work of winding the coil end, which was a bottleneck for automation, has been eliminated, making automation possible. By removing excess solder with a wiping member, there is no solder buildup and it is stable on the printed circuit board. It will be possible to place it. In addition, since there is a process of removing with a wiping member,
It has various excellent features such as the fact that the wiping member presses the bent end part against the electrode part without having to wrap and fix the end part of the coil as in conventional methods, so that it can be securely connected to the electrode part. be effective.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a conventional chip-shaped coil component, and FIGS. 2 and 3 are perspective views of a chip-shaped coil component according to the manufacturing method of the present invention. 21.39...Core, 22.23.37.3
8...Flange, 24.25.26.27.
...Protrusion, 28.29.30゜31.41.4
2... Electrode, 32.40... Coil, 33.34.35.36.43.44...
Terminal section. Patent application: Murata Manufacturing Co., Ltd. Procedures Amendment Date: IC, February 1982 (To the Patent Office Examiner) 1. Indication of the case 1982 Patent Application No. 2.04227 2. Name of the invention Chip Manufacturing method for shaped coil parts 3, relationship with the case of the person making the amendment Patent applicant address 2-26-10 Tenjin, Nagaokakyo City, Kyoto Name <
623> Mura Co., Ltd. 1) Manufacturer 5, number of inventions increased due to amendment (1) "Habin to Hatta" in the first line of page 4 of the specification
...The term ``string-like wiping member'' is corrected to ``a wiping member made of a string-like material with poor thermal conductivity, such as fluffy wool or kite string.'' (2) Winding the first wire rod in lines 10 and 11 of the fifth page...The shape of the core is corrected as shown in the figure as follows. It is also possible to adopt a method of winding the wire.Also, the insulation coating of the wire that makes up the coil is

Claims (1)

[Scope of Claims] A method for manufacturing a chip-shaped coil component, comprising the following steps a) to d). a) Winding a coil around a core having a flange with at least one pair of electrodes attached to the bottom surface. b) Step of bending the plurality of end portions of the coil in the same direction along the electrodes on the bottom surface of the 7-lunge. C) A step of applying solder to the bent end portion and the electrode. d) A step of removing excess solder with a wiping member before the applied solder solidifies.