JPH0670208U - coil - Google Patents

Abstract

(57) [Summary] [Purpose] To prevent the occurrence of defects in the coiling work for small coils. [Structure] On the outside of the winding core 11 made of a conductive metal member,
The winding start end of the conductive foil 13 is connected. The conductive foil 13 is wound around the winding core 11. After that, the cylindrical terminals 14 are connected and sliced into a predetermined shape to obtain the flat coil body 15. [Effect] The winding core 11 can obtain strength that can withstand the tension applied at the time of winding foil. Therefore, there is no fear that the winding core 11 is bent or wrinkles are generated in the conductive foil 13 during the winding foil work.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a coil used for various electric parts such as a motor, a transformer and an electromagnet.

[0002]

[Prior art]

 Conventionally, a method of manufacturing this type of coil has been disclosed in, for example, Japanese Patent Publication No. 4-9028. That is, as shown in FIG. 5, the end of the conductive foil 2 is electrically connected to the cylindrical terminal 1 having conductivity by soldering or the like. Next, after mounting the cylindrical terminal 1 on the clearance portion 4 of the core 3 made of a resin molding material such as plastic, the conductive foil 2 is wound around the core 3. After the winding of the conductive foil 2 is completed, as shown in FIG. 6, the winding core 3 is extracted from the conductive foil 2 and the conductive foil 2 is sliced with a slicing wire 5 at a predetermined width perpendicular to the axial direction. The hollow flat coil main body 6 shown in FIG. 7 is obtained by cutting with.

[0003]

[Problems to be solved by the device]

 In the above-mentioned prior art, when the overall shape of the flat coil body 6 is made small, the core 3 is formed with the escape portion 4 for mounting the tubular terminal 1 along the axial direction. It becomes thinner and weaker in strength. Therefore, when the conductive foil 2 is wound around the winding core 3, the winding core 3 is bent due to the tension applied to the winding core 3, or wrinkles are generated in the conductive foil 2. It was the cause of the trigger.

Therefore, an object of the present invention is to solve the above problems and provide a coil that does not cause defective winding even when the overall shape of the coil is reduced.

[0005]

[Means for Solving the Problems]

 According to the present invention, in a coil formed by winding a conductive foil around a winding core, the winding core is made of a conductive metal member, and an end portion of the conductive foil is connected to an outer surface of the winding core. It is a thing.

[0006]

[Action]

 With the above structure, the core is made of a metal member, and the end of the conductive foil is directly connected to the outside of the core, so that the core has sufficient strength to withstand the tension applied during the winding. You can

[0007]

【Example】

 An embodiment of the present invention will be described below with reference to FIGS. In the figure, 11 is a rod-shaped winding core made of a conductive metal member such as copper, and is formed in a substantially fan-shaped cross section according to the finished shape of the coil. A connection portion 12 is formed on the outer surface of the winding core 11, and the winding start end of a conductive foil 13 made of copper is directly electrically connected to the connection portion 12. The conductive foil 13 is previously rolled to a predetermined thickness, and an insulating adhesive such as an epoxy resin is applied to one surface of the conductive foil 13 to form a substantially uniform adhesive layer (not shown). Reference numeral 14 denotes a cylindrical terminal connected to the end of the conductive foil 13 at the end of winding, and the completed flat coil body 15 and the printed sheet are printed through the cylindrical terminal 14 and the side portion of the winding core 11. Electrical connection is made with the land portion 17 formed at an appropriate position on the substrate 16.

After the winding start end of the conductive foil 13 is soldered to the connecting portion 12 of the winding core 11 shown in FIGS. 1 and 2, the conductive foil 13 is wound in the direction of the arrow in FIG. turn. In the work of winding the conductive foil 13, the winding core 11 is formed of a metal member, and the end of the conductive foil 13 is directly connected to the connecting portion 12 on the outside of the winding core 11. Sufficient strength is given to the core 11, and there is no fear that the winding core 11 is bent or wrinkles are generated in the conductive foil 13 in the middle. When the winding operation is completed in this way, as shown in FIG. 3, the cylindrical terminal 14 is soldered to the end of the conductive foil 13 at the end of winding. Then, the conductive foil 13 together with the winding core 11 is cut into a predetermined width at right angles to the axial direction by a slicing wire (not shown), and the flat coil body 15 shown in FIG.

The winding core 11 is also used as a terminal for electrically connecting to the outside. That is, when connecting to the land portion 17 formed on the printed circuit board 16 as shown in FIG. 4, after applying the solder paste (not shown) to the land portion 17 in advance, winding each land portion 17 and winding. The flat coil body 15 is placed on the printed board 16 while the core 11 and the tubular terminal 14 are in contact with each other. In this state, the flat coil body 15 and the printed circuit board 16 are passed through the reflow solder bath, whereby the land portion 17, the winding core 11 and the tubular terminal 14 are electrically connected.

As described above, according to the above-described embodiment, the winding core 11 is formed of the metal member, and the winding start end of the conductive foil 13 is directly connected to the outside of the winding core 11. Even if the overall shape of the flat coil body 15 is downsized, the core 11 can obtain sufficient strength to withstand the tension applied at the time of winding foil, so that the winding core 11 can be bent and wrinkles in the conductive foil 13 can be reduced. It is possible to suppress the occurrence of the phenomenon and obtain a good winding foil state.

Further, since the winding core 11 around which the conductive foil 13 is wound can be used as a connection terminal to the outside, it is not necessary to take out the winding core as in the prior art. Moreover, in the case of the coil without the cylindrical terminal 1 in the conventional example, when the both ends of the conductive foil 2 are directly soldered to a printed circuit board or the like, the winding start end of the conductive foil 2 is a flat coil. Since the flat coil body 6 is formed in the hollow portion, it cannot be soldered especially when the flat coil body 6 is small. However, in the coil of this embodiment, the flat coil body 15 is small. Also, it is possible to easily make a soldering connection to the outside through the winding core 11.

The present invention is not limited to the above embodiment, and various modifications can be made within the scope of the present invention. For example, the core is not limited to copper, but other conductive members can be used. Further, the cross-sectional shapes of the winding core and the conductive foil can be changed as appropriate.

[0013]

[Effect of device]

 According to the present invention, in a coil formed by winding a conductive foil around a winding core, the winding core is made of a conductive metal member, and an end portion of the conductive foil is connected to an outer surface of the winding core. Therefore, it is possible to provide a coil that does not cause defective winding foil even if the overall shape of the coil is reduced.

[Brief description of drawings]

FIG. 1 is a perspective view of a winding core according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a state in which a conductive foil is wound around the same core.

FIG. 3 is a perspective view showing a state in which a cylindrical terminal is connected to the above conductive foil.

FIG. 4 is a perspective view showing a state in which the flat coil body is connected to a printed circuit board.

FIG. 5 is a perspective view of a flat coil body showing a conventional example.

FIG. 6 is a perspective view showing a state in which the conductive foil is wound around the core.

FIG. 7 is a perspective view showing a state in which the same conductive foil is cut.

[Explanation of symbols]

 11 Core 12 Connection 13 Conductive foil

Claims (1)

[Scope of utility model registration request] 1. A coil formed by winding a conductive foil around a winding core, wherein the winding core is made of a conductive metal member, and an end portion of the conductive foil is connected to an outer surface of the winding core. A coil characterized by that.