JPH0722250A - Coil terminal - Google Patents

Abstract

PURPOSE:To enhance the workability at the time of connection on a board while preventing disconnection of wire by leading out an end of a wire from the inner winding of a coil to the outside along the side face thereof and then connecting the end of wire with an object. CONSTITUTION:A coil terminal, i.e., an inner terminal part 20 for connecting an end 4A of a rectangular wire 4 led out from the interior of a coil 2 with a land 6 on a board 5 is turned up in the direction of the side face 2A of the coil 2 at a bent part 21 and further bent along the side face 2A of the coil 2 at the edge part 2B on the side face of the coil. The bent rectangular wire 4 is then bonded to the side face 2A of the coil 2 through an adhesive 25. Furthermore, the end part 4A of the rectangular wire 4 is bent along the board 5 at the part where the side face 2A of the coil 2 is jointed to the board 5. An insulation layer is peeled off the surface at a bent part 4D which is then mounted on the land 6 of the board 5 and soldered 24.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coil terminal, and is preferably applied to a coil terminal of a coil formed by winding a rectangular electric wire, for example.

[0002]

2. Description of the Related Art Conventionally, as a coil terminal of this type, as shown in FIG. 5, there is a coil 2 such as a voice coil in which a rectangular electric wire 4 is wound around a square mandrel for a predetermined number of turns, several rows in a row, and several stages in a vertical row. In this coil 2, the tip portion 4A of the rectangular electric wire 4 is pulled out to the outside as the inner terminal portion 1 and soldered to the land 6 formed on the substrate 5.
Further, the tip portion 4B at the other end of the rectangular electric wire 4 is adapted to be soldered to the land 7 formed on the substrate 5 as the outer terminal portion 3.

By thus soldering the end portions 4A and 4B of the rectangular electric wire 4 of the coil 2 to the lands 6 and 7 of the substrate 5, the coil 2 is electrically connected to the circuit pattern formed on the substrate 5. It is designed to get you.

[0004]

However, in the inner terminal portion 1, it is necessary to pull out the tip portion 4A of the rectangular electric wire 4 from the inside of the coil 2 and solder it to the land 6.
When the flat wire 4 is pulled out, a complicated work process is required, and the flat wire 4 is pulled out at the pulling out portion.
Could be broken.

The present invention has been made in consideration of the above points, and an object of the present invention is to propose a coil terminal that can further improve workability when connecting to a substrate and can prevent wire breakage. It is a thing.

[0006]

In order to solve the above problems, according to the present invention, in the coil terminal 20 of the coil 2 formed by winding the electric wire 4, the tip portion 4A of the electric wire 4 pulled out from the inside of the winding of the coil 2. Is drawn to the outside of the coil along the side surface 2A of the coil 2, and the tip 4A of the drawn electric wire 4 is connected to the connection target 6.

In the present invention, the electric wire 4 is a rectangular electric wire having a substantially square cross section.

[0008]

The electric wire 4 drawn out from the inside of the coil 2 is drawn to the outside along the side surface 2A of the coil 2 to form the coil terminal 20, so that disconnection of the electric wire 4 can be prevented in advance. Since the terminal 20 is formed on the outside, the step of connecting the coil 2 to the connection target can be simplified.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings.

In FIG. 1 in which parts corresponding to those in FIG. 5 are designated by the same reference numerals, the tip portion 4A of the rectangular electric wire 4 pulled out from the inside of the coil 2 as a coil terminal is connected to the land 6 of the substrate 5.
The inner terminal portion 20 connected to is bent back toward the side surface 2A of the coil 2 at the bent portion 21 and further bent along the side surface 2A of the coil at the edge 2B of the coil side surface. The side surface 2A of the coil 2 and the bent rectangular electric wire 4 are bonded together by an adhesive 25.

Further, at the portion where the side surface 2A of the coil 2 and the substrate 5 are in contact with each other, the tip portion 4A of the rectangular electric wire 4 is attached to the substrate 5.
Bend about 1 mm along the line. After peeling off the insulating layer on the surface of the bent portion 4D, the bent portion 4D is placed on the land 6 of the substrate 5 and soldered by the solder 24.

Further, as shown in FIG. 2, the outer terminal portion 30 for connecting the tip portion 4B of the flat wire 4 located outside the coil 2 as a coil terminal to the land 7 (FIG. 1) of the substrate 5 is connected to the flat wire 4 as shown in FIG. After cutting the tip portion 4B at the contact portion 32 where the coil 2 contacts the substrate 5, about 2
About [mm], the insulating layer formed on the surface of the rectangular electric wire 4 is peeled off, and the peeled portion 31 and the land 7 of the substrate 5 are soldered.

The structure of the coil 2 is, for example, a rectangular copper wire (thickness: 0.065 [mm] × width: 0.73 [mm]) that is insulation-welded to a square mandrel having an inner diameter of 7 [mm] × 8 [mm]. Is wound, and an epoxy varnish is used for the insulation fusion treatment.

When the rectangular wire 4 is wound, as shown in FIG. 3, a felt 41 impregnated with ethyl alcohol 43 is used.
The ethyl alcohol 43 is attached to the surface of the rectangular electric wire 4 by passing the rectangular electric wire 4 between the electrodes 42 and 42.

In this state, the rectangular electric wire 4 is wound around the rectangular mandrel for a predetermined number of turns (166 turns). The winding speed is
120 [rpm] and winding tension are 280 [g / piece].
In this way, the rectangular electric wire 4 is fixed by blowing slightly heated air (40 to 50 [° C.]) on the coil 2 wound with the rectangular electric wire 4 for about 1 minute to dry it.

In the above structure, as the terminal portion of the coil 2, the rectangular electric wire 4 is pulled out while closely adhering along the side surface 2A of the coil 2 to form the inner terminal portion 20, so that the coil 2 is mounted on the substrate 5. When doing, the inner terminal portion 20
After mounting the coil 2 on the board 5 such that the outer terminal section 30 is positioned on the lands 6 and 7 of the board 5, the inner terminal section 20 and the outer terminal section 30 are soldered to the lands 6 and 7. By doing so, the coil 2 can be connected to the substrate 5.

In this case, since the tip end portion 4A of the rectangular electric wire 4 is fixed to the side surface 2A of the coil 2 as the inner terminal portion 20, it is troublesome to draw the rectangular electric wire 4 from the inside of the coil 2 as in the conventional case. The process can be avoided, the working process can be further simplified, and the breakage of the rectangular electric wire 4 can be prevented.

According to the above construction, it is possible to realize the coil terminal (inner terminal portion 20) in which the coil 2 can be connected to the substrate by a simpler process and there is no fear of disconnection.

In the above embodiment, the inner terminal portion 2
The case where the tip portion 4A of the rectangular electric wire 4 is bent along the board 5 at the portion where the side surface 2A of the coil 2 and the board 5 are in contact with each other and soldered to the land 6 at the bent portion 4D (FIG. 1) has been described. However, the present invention is not limited to this, and as shown in FIG. 4, the tip portion 4A of the rectangular electric wire 4 may be cut at a position 4H where the side surface 2A of the coil 2 and the substrate 5 are in contact.

In this case, the insulating film of the tip portion 4A of the rectangular electric wire 4 along the side surface 2A of the coil 2 may be peeled off, and this portion may be soldered.

Further, in the above embodiment, the rectangular electric wire 4
The case where the present invention is applied to the coil terminal of the coil 2 formed by winding is described, but the present invention is not limited to this, and the present invention can be applied to electric wires having various other cross-sectional shapes.

[0022]

As described above, according to the present invention, the electric wire is drawn from the inside of the coil along the surface of the coil to form the coil terminal, so that the coil terminal can be connected to the substrate by a simpler process. At the same time, it is possible to realize a coil terminal that can prevent breakage of the electric wire.

[Brief description of drawings]

FIG. 1 is a partial perspective view showing an embodiment of a coil terminal according to the present invention.

FIG. 2 is a partial perspective view showing a configuration of an outer terminal portion.

FIG. 3 is a cross-sectional view provided for explaining a step of adhering alcohol to an electric wire.

FIG. 4 is a partial perspective view showing a coil terminal according to another embodiment.

FIG. 5 is a perspective view showing a conventional coil terminal.

[Explanation of symbols]

2 ... Coil, 4 ... Rectangular wire, 5 ... Substrate, 6, 7 ...
… Land, 20 …… Inner terminal part, 21 …… Folded part, 30
...... Outer terminal part.

Claims (2)

[Claims] 1. A coil terminal of a coil formed by winding an electric wire, wherein a tip portion of the electric wire drawn out from the inside of the wound coil is drawn out to the outside of the coil along a side surface of the coil and is drawn out. A coil terminal, wherein the tip end of the electric wire is connected to a connection target. 2. The coil terminal according to claim 1, wherein the electric wire is a rectangular electric wire having a substantially quadrangular cross section.