JPS5830797B2 - How to manufacture voice coils - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of manufacturing a voice coil for a speaker.

Conventionally, in order to facilitate the manufacture of speakers, there is a structure in which a tinsel wire is soldered and attached to the lead portion of a voice coil in advance.

A method for manufacturing such a voice coil is known from Japanese Patent Publication No. 49-31646.

That is, to explain with reference to FIGS. 1 to 4, a voice fill 2 is wound around a coil bobbin 1, and this voice coil 2 is
Pull out the lead parts 3 and 4 at both ends at the beginning and end of the winding in one direction (Fig. 1), and attach a piece of tinsel wire 6 to the lead parts 3 and 4 at both ends with solder 5 welded to the intermediate part and both ends. Place (second
figure).

The solder welded portion 5 at the middle portion of the tinsel wire 6 is disposed astride the lead portions 3 and 4 at both ends.

Next, as shown in FIG.
The solder welded part 5' in the middle part is heated and pressurized with a soldering iron heated to 300 to 330°C to attach it, and then the 6 parts of the tinsel wire between the lead parts 3 and 4 at both ends are cut with a cutter. .

Then, an adhesive is applied to the connecting portion 7, and after drying, unnecessary portions of the lead portions 3 and 4 at both ends are cut off, thereby completing a voice coil equipped with a tinsel wire 6 as shown in FIG. 4.

In the above manufacturing method, after soldering the tinsel wire 6 to the lead parts 3 and 4 at both ends, in order to cut and remove the unnecessary portion of the tinsel wire 6, two pieces of tinsel wire are attached to the coil bobbin 1 at the cut point of the tinsel wire 6. Cuts 8, 8 are formed, and these parts protrude inward of the coil bobbin 1, and the coil bobbin 1 is cut by cutting the tinsel wire 6.
It is easily deformed because a large external force is applied to it.

Furthermore, when the tinsel wire 6 is cut, the connecting portion 7 between the lead portions 3 and 4 at both ends and the tinsel wire 6 spreads outward (in the tangential direction of the surface of the coil bobbin 1) or rises from the surface of the coil bobbin 1, making post-processing difficult. become.

Further, although the rigidity of the connecting portion 7 of the tinsel wire 6 of the coil bobbin 1 is increased by soldering, on the other hand, the cut portion of the tinsel wire 6 is weakened by the cuts 8, 8, and therefore the tinsel wire 6 is used for inputting audio signals. When the coil bobbin 1 is bent and shaped for connection to a terminal, the cut 8 portion of the coil bobbin 1 protrudes inward and is deformed.

These various deformations make it difficult to insert the voice coil jig and paper cone when assembling the speaker, resulting in poor workability and also causing contact with the magnetic gap surface (gap displacement).

The present invention improves these conventional drawbacks.

The voice coil manufacturing method of the present invention will be explained below.

As shown in FIG. 8 or 9, two tinsel wires 6, 6
Solder 5 is welded to both ends of the tinsel wire 6.6, and the solder welded portions 5, 5 of one of the tinsel wires 6, 6 face each other with an interval of about 1 mm, and both wires 6, 6 are heated using polyamide resin or the like. Meltable resin 9
Concatenate by.

These two tinsel wires 6, 6 are placed across the lead portions 3, 4 at both ends of the voice coil 2 (FIG. 5).

Next, as shown in FIG. 6, the lead parts 3 and 4 at both ends are bent in the direction opposite to the drawing direction so as to sandwich the tinsel wires 6 and 6, and the bent parts and the tinsel wires 6 and 6 are soldered and welded. At the same time, the parts 5, 5 are heated and pressurized with solder and soldered, and the hot-melt resin 9 is melted to connect the coil bobbin 1 and the solder welded part 5,
Glue 5.

Then, a connecting portion 7 between the lead portions 3 and 4 at both ends and the tinsel wires 6 and 6 is provided.
, 7 are coated with adhesive, and after drying, unnecessary parts of the lead portions 3 and 4 at both ends are cut off to complete a voice coil equipped with tinsel wire 6 as shown in FIG.

The above manufacturing method is such that two tinsel wires 6, 6 are connected in advance with hot melt resin 9, and these two tinsel wires 6, 6 are placed on both ends of lead portions 3, 4 and soldered. Therefore, the process of cutting tinsel wire in the conventional method is unnecessary, and the manufacturing process is simplified.

Further, since there is no cutting process for the tinsel wire 6 and no cuts are made in the coil bobbin 1, there is no deformation of the coil bobbin 1 or inward deformation due to cuts at the cut portions of the coil bobbin 1.

Furthermore, since the connection part 7 of the tinsel wire 6 will not be weakened by cuts, the coil bobbin will not be deformed even if the tinsel wire 6 is bent and shaped. It is also extremely easy to insert the
Productivity is improved, and there is no contact (gap shift) with the magnetic gap surface.

Furthermore, the connection part 7 of the tinsel wire 6 may spread outward,
Since it does not rise from the surface of the coil bobbin 1, it has the advantage that post-processing becomes extremely easy.

In the above embodiment, the tinsel wires 6, 6 were connected using a thermosetting resin 9 such as a polyamide resin, but the same effect as in the above embodiment can be obtained even if a thermosetting resin such as an epoxy resin is used. and does not depart from the scope of the present invention.

As described above, in the present invention, the tinsel wires 6, 6 connected by the hot-melt resin 9 are placed on the lead parts 3, 4 at both ends of the voice coil 2, and soldered. 4 and the tinsel wires 6 and 6, the manufacturing process is significantly simplified, and the workability is also good in the manufacturing process.
Automation is also possible, making it suitable for mass production, and therefore, it is advantageous in terms of cost, and it is of industrial value as well as improving quality.

[Brief explanation of drawings]

1 to 4 are diagrams showing the conventional voice coil manufacturing method, FIGS. 5 to 7 are diagrams showing the voice coil manufacturing method of the present invention, and FIGS. 8 and 9 are the same and preliminary. FIG. 3 is a diagram showing the structure of processed tinsel wire. 5 is a solder welded portion, 6 is a tinsel wire, 9 is a synthetic resin, 1 is a coil bobbin, 2 is a voice coil, and 3 and 4 are lead portions at both ends.

Claims (1)

[Claims] 1 Two tinsel wires 6 with solder welds 5, 5 formed on both ends
, 6 are connected by a synthetic resin 9 with the solder welded parts 5, 5 of the two tinsel wires 6, 6 facing each other with a predetermined interval apart,
Both end lead portions 3 of a voice coil 2 in which the solder welded portions 5, 5 of the connected tinsel wires 6, 6 are wound around a coil bobbin 1;
4, the solder welded portions 5, 5 are heated, and the tinsel wire 6.6 is connected to both end lead portions 3, 4 of the voice coil 2.