JPS645846Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an electromagnetic coil constructed using a conductive wire with a small diameter.

A high-frequency transformer is an example of an electromagnetic coil that uses a small wire diameter. For example, the high-voltage coil of a flyback transformer may be constructed by laminating several layers of coils each having a conductive wire wound around 50 μm in diameter multiple times on a cylindrical bobbin, and connecting a diode between each layer. In this case, since the wire diameter is small, it is difficult to process the beginning and end of the winding, so it is difficult to pull out the lead wire by pasting adhesive tape, or temporarily melt a part of the bobbin with heat. By doing so, the leader line was fixed. However, in the case of the above configuration, when stacking coils of different diameters, the taped part or the melted part becomes an obstacle, making it impossible to stack them smoothly, making it necessary to increase the coil diameter, which reduces the magnetic coupling with the low-voltage coil. This has the disadvantage of reducing the conversion efficiency of weak power.

Further, it is not suitable for mass production because it requires a lot of man-hours to tape or fuse the lead wires for each coil of each layer.

The present invention has been developed in view of the above points, and provides an electromagnetic coil in which a coil bobbin made of a strip-shaped interlayer insulator is provided with slanted slits at both ends, and the lead wire of the coil is easily drawn out using the slits. It is something to do.

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. FIG. 1 shows a strip of interlayer insulation forming a cylindrical coil bobbin. The insulator 1 is, for example, a plastic film such as a polyester film or a polycarbonate film, or an interlayer paper such as an insulated kraft paper, and has a predetermined width and length. At both ends of the insulator 1 in the lateral direction, slits 4 and 5 of a constant length and inclined with respect to the end sides 2 and 3 are provided at equal intervals. One end of the slits 4, 5 reaches the edges 2, 3, and the other end terminates in a circular end 6 or a square end 7, as shown in FIGS. 2 and 3.

The coil bobbin 8 is formed by rolling the strip-shaped interlayer insulator 1. In this case, the wall thickness of the coil bobbin 8 is
The insulator 1 is determined by the number of times it is rolled up and layered. It is usually preferable to make the coil by layering it 3 to 10 times, but it is determined by considering the thickness of the insulator 1 and the required thickness of the coil bobbin. By forming the coil bobbin, stress and strain remain in the insulator 1, so that a force is applied to the coil bobbin 1 to hold it in a cylindrical shape. Therefore, as shown in FIG. 4, the tongues 9 and 10, which are divided by slits provided at both ends of the outermost insulator, have a shape that opens outward in the radial direction. This coil bobbin 8 has a conductor 1
1 is wound a predetermined number of times to form an electromagnetic coil 12. The lead wire 13 at the winding start end of the coil and the lead wire 14 at the winding end end are hooked onto the terminal ends 6, 7 of the slits 4, 5 of the insulator 1, respectively, in other words, the bases of the tongue pieces 9, 10, and then connected to the coil bobbin. 8 in the axial direction,
It is held between the tongues 9, 10 and the insulation of the previous layer. When forming a high-voltage coil by laminating electromagnetic coils having the above-mentioned configuration, the number of coils having different diameters equal to the number of laminated layers is created. When laminating the coils, the tongues can be easily inserted by slightly rotating the coils, and the tongues 9 and 10
locks the next layer of coils by its elasticity.

When the terminal ends 6, 7 of the slits 4, 5 are formed wide as shown in FIGS. 2 and 3, the leader lines 13, 1
4 enters deeply inside the tongue pieces 9, 10, so that the leader wire can be held securely. This is also further facilitated by providing the slits 4, 5 at an angle of inclination to the plane passing through the axis. Furthermore, if the direction of the inclined slit is tilted in the same direction as the plane passing through the axis and the winding direction of the coil is adapted to this, the processing of the lead wire of the coil can be made easier as shown in Fig. 4. Become.

As shown above, in this invention, a coil bobbin is formed from a band-shaped insulator provided with slits, and a conductive wire is wound around this to form an electromagnetic coil. By using the slits, the lead wire of the coil can be processed. It is easy to perform and does not require pasting tape or locally melting the bobbin, making it easy to reduce man-hours and automate the winding process.

Furthermore, since no protrusion is formed on the coil bobbin as in the conventional case, the coil diameter can be made smaller when stacking coils of different diameters, and the magnetic coupling between each layer and the low voltage coil can be increased.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a part of the insulator according to the present invention, FIGS. 2 and 3 are views of an embodiment of the slit end portion, and FIG. 4 is a perspective view of the electromagnetic coil of the present invention. In the figure, 1 is an insulator, 4 and 5 are slits, and 6 and 7
is the terminal end, 8 is the coil bobbin, 9 and 10 are the tongue pieces,
11 is a conducting wire, 12 is an electromagnetic coil, and 13 and 14 are lead wires.

Claims (1)

[Scope of utility model registration request] A coil bobbin is formed by rolling and layering a strip-shaped interlayer insulator provided with slits at both ends in the transverse direction that are inclined with respect to the end sides and have wide end portions, and a tongue that opens outward in the radial direction of the bobbin by the slits. What is claimed is: 1. An electromagnetic coil characterized in that a conductive wire is wound around the bobbin, and the lead wires at both ends of the coil are hooked onto the tongue pieces and drawn out in the axial direction of the bobbin.