JPS6025866Y2 - inductance element - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an inductance element having a lead wire fixed to a magnetic core.

In inductance elements such as high-frequency coils used in communication equipment and various electronic circuits, a lead wire is fixed to a magnetic core, and the terminal of the winding wound around the magnetic core is tied to the base of the lead wire. is connected to.

Figure 1 shows an example of a conventional inductance element, in which 1 is a magnetic core, 2 is a lead wire, 3 is a winding wire,
3a indicates the terminal of the winding 3.

The lead wire 2 is fixed to a recess 4 formed in the magnetic core 1 with, for example, an epoxy thermosetting adhesive 5.

Usually, the recess 4 is filled with thermosetting adhesive 5 in advance,
After inserting the lead wire 2 into this adhesive, the lead wire 2 is fixed to the magnetic core 1 by heating and curing the adhesive 5.

In the conventional inductance element configured in this way, as described above, the terminal 3a of the winding 3 is electrically connected to the base of the lead wire 2, so that the lead wire 2 Winding terminal 3a due to bending etc.
Disadvantages include wire breakage at the contact point between the winding material and the lead wire due to stress, and the adhesive softening due to heating during installation of the inductance element, reducing the tensile strength of the lead wire and causing wire breakage accidents. was there.

The present invention has been made to eliminate the above-mentioned drawbacks, and one embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 2 is a schematic cross-sectional view showing one embodiment of the inductance element according to the present invention. In the figure, 10 is a cylindrical magnetic core, 11 is a lead wire, 12 is a winding wound around the magnetic core 10, and 12a indicate the terminals of the winding 12, respectively.

In the present invention, for example, cylindrical convex portions 13 are formed on both end faces of the magnetic core 10, and through these convex portions 13, for example, circular concave portions 14 for inserting lead wires are formed in the axial direction. A conductor layer 15 is formed on 14 by, for example, electroplating.

Therefore, the lead wire 11 having an outer diameter equivalent to the inner diameter of the recess 14 for incorporating the lead wire or the lead wire 11 having a jagged edge such as a paris at the end of the lead wire is inserted into the recess 1.
4, fit it and fix it to the magnetic core 10, and then
2 ends 12a are tied around the outer periphery of the convex portion 13.

A conductor layer 15 is attached to the outer periphery of the convex portion 13, and this conductor layer 15 is continuous within the concave portion 14.
It is also electrically connected to the end of the lead wire 11.

That is, the winding 12 and the lead wire 11 are connected to the conductor layer 15.
This will result in an electrical connection.

Since the present invention is configured as described above, the lead wire 1
Even if stress is applied to the lead wire by bending 1, etc., the end of the thin winding is tied to the convex portion 13, so this stress is not transmitted to the winding material at all, and therefore no wire breakage occurs.

That is, the end 12a of the winding 12 is connected to the convex portion 13 of the magnetic core 10.
Since the outer periphery of the lead wire 11 is tied, the lead wire 11 is independent from the terminal 12a of the winding 12. Therefore, the stress applied to the lead wire 11 is limited to the lead wire only, so there are no problems such as wire breakage. Become.

Further, the end 12a of the winding 12 is connected to the convex portion 1 on the end face of the magnetic core 10.
3, so the winding has good adhesion.

Further, the lead wire 11 is inserted into the recess 1 for inserting the lead wire.
4, the lead wire 11 will not loosen or move due to heating.

Further, since the convex portions 13 are formed on both end faces of the magnetic core 10 and the conductor layer 15 is simply adhered to the convex portions 13 and the recessed portions 14 for installing the lead wire, there are no manufacturing problems.

The conductor layer 15 can be readily formed by electroplating a suitable metal, such as nickel, or alloy, or by other known means.

Although the distal end portion of the lead wire 11 may be knurled for better fitting, it can be sufficiently fixed even if the lead wire 11 has an outer diameter equivalent to the inner diameter of the recess 14.

As described above, according to the present invention, an inductance element without troubles such as disconnection can be obtained with a simple structure, and its practical value is considerable.

[Brief explanation of drawings]

FIG. 1 is a schematic sectional view showing an example of a conventional inductance element, and FIG. 2 is a schematic sectional view showing an embodiment of an inductance element according to the present invention. 10: Magnetic core, 11: Lead wire, 12: Winding wire, 12a
: Terminal of winding wire, 13: Convex portion of magnetic core, 14: Recessed portion for incorporating lead wire, 15: Conductor layer.

Claims (1)

[Scope of utility model registration request] A convex portion is formed on both end faces of the magnetic core, a concave portion for incorporating a lead wire is formed in the axial direction through the convex portion, a conductor layer continuous to the convex portion and the concave portion is coated, and the conductive layer is wound around the magnetic core. The end of the winding is wrapped around a conductor layer around the outer periphery of the convex portion, a lead wire is inserted and fixed into the recess, and the winding and the lead wire are electrically connected by the conductor layer. inductance element.