JPH0413910Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a speaker whose diaphragm is conductive, such as carbon fiber.

[Conventional technology]

The conventional method of connecting the voice coil and lead wire in a speaker whose diaphragm is conductive is the second method.
As shown in FIGS. 1 and 2, a copper foil 12 is pasted on the bobbin 10 to reduce work, and an insulating member 14 is pasted on the bobbin 10.
The lead wire 16 with the
0, press the end of the lead wire 16 against the copper foil 12 and solder it, or as shown in FIG.
Either the lead wire 16 is pulled out directly from the bobbin 10 on the back side of the diaphragm 18, or, as shown in FIG. After forming the insulating part, the lead wire 16 is drilled through two through holes 20, and the ends of the lead wire 16 are inserted into the two through holes 20 in a hook shape, and the voice coil lead wire 24 of the bobbin 10 is inserted into the hook shape. Some parts were connected by soldering, etc.

[Problem that the invention attempts to solve]

Therefore, in the method shown in Fig. 2, the selection is limited to the use of a bobbin made of an insulating material for pasting the copper foil, and the cost is high.In addition, the connection work must be performed at the end of the lead wire. As shown in the figure, unless the lead wire is pressed against the neck of the bobbin, the lead wire will not be fixed in a predetermined position and the soldering work will be difficult, and the pressing work itself will tend to vary, so it is not very efficient as a whole.

In addition, in the case of Fig. 3, the distance L from the end of the voice coil wound on the bobbin to the diaphragm must be long, which has the disadvantage of deteriorating the electrical-acoustic exchange characteristics.Conversely, if L is shortened, the lead There was a risk that the wire would hit the diaphragm and cause it to deteriorate or break.

Furthermore, in the case of Fig. 4, although the above-mentioned drawbacks are alleviated, it is necessary to create two insulating sections at a predetermined distance H between the lead wires using two heat-shrinkable tubes, which is still difficult in terms of workability. There was a big problem.

The present invention was devised in view of these drawbacks of the prior art, and aims to provide a speaker in which the voice coil and lead wire can be easily and inexpensively connected even if the diaphragm is conductive. purpose.

[Means for solving problems]

The speaker according to the present invention includes a conductive diaphragm with two through holes near the bobbin, a single plate having a cut-out part and a partial covering part in the center, and a complete covering part at both ends. A heat shrinkable tube and a voice coil lead wire are provided, the ends of the lead wires are integrally fixed within the completely covered portion of the heat shrinkable tube, and insulation is provided from one of the two through holes to the other. The heat-shrinkable tube is inserted and fixed in a hook shape while maintaining the temperature, and the voice coil lead wire is connected to the lead wire exposed from the cutout part 34 of the heat-shrinkable tube.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1, 5, and 6.

FIG. 1 is an abbreviated cross-sectional view showing a connecting portion between a voice coil and a lead wire of a speaker according to the present invention.

In FIG. 1, the front end of a bobbin 10 is fixed to the central opening of a diaphragm 18 made of a conductive material such as carbon fiber. Bobbin 1
A voice coil 26 is wound around a predetermined portion on the outer periphery of the voice coil 26, and a voice coil lead wire 24 of the voice coil 26 is drawn out from the bobbin 10 near the front surface of the diaphragm 18.

In the vicinity of the bobbin 10 of the diaphragm 18, through holes 20 for fixing the lead wires 16 are provided at predetermined intervals in the radial direction.
(See Figure 6) is drilled. The ends of a lead wire 16 such as a tinsel wire arranged on the back side of the diaphragm 18 are inserted into these two through holes 20 from one end of the lead wire 16 to the other through the two through holes 20 while maintaining insulation. It is inserted and fixed, and the end of the lead wire 16 is located on the front side of the diaphragm 18.

The end of the lead wire 16 is covered with a heat-shrinkable tube 28 that serves as an insulating member. This heat-shrinkable tube 28 is partially cut off on the opposite side from the central diaphragm 18, leaving both ends intact, and the completely covered parts 30 at both ends provide insulation between the diaphragm 18 and the lead wire 16 in the vicinity of the through hole 20. In addition, the diaphragm 18 and the lead wire 1 between the through holes 20 are formed in the central partial covering part 32.
6 insulation is provided.

The voice coil lead wire 24 is connected to the lead wire 16 exposed in the cutout portion 34 of the heat shrinkable tube 28 by soldering or the like so as not to come into contact with the diaphragm 18.

Next, a method of assembling the connection portion between the bobbin 10 and the lead wire 16 in the above embodiment will be explained with reference to FIG. 5 and the like.

Two through holes 20 for one lead wire 16 are bored at a predetermined interval by a press or the like at a predetermined location near the central opening of the diaphragm 18.
A bobbin 10 is fixed to 8 and integrated. At this time, the voice coil lead wire 24 of the bobbin 10 is placed on the front side of the diaphragm 18.

On the other hand, a heat shrink tube 28 having an inner diameter larger than that of the lead wire 16 is inserted into the two through holes 2 of the diaphragm 18.
Cut it slightly longer than the distance between the two through holes 20, leaving both ends intact, and cut out a part of the center to a length shorter than the distance between the two through holes 20 to form the cutout part 34 (see FIG. 5, 1).

After the heat-shrinkable tube 28 thus formed is fitted into the end of the lead wire 16 (see FIG. 5, 2), the tube is heated to shrink the lead wire 16.
and the heat shrink tube 28 are fixed together (see FIG. 5, 3). At this time, both ends of the heat-shrinkable tube 28 form a completely covered part 30, and the remainder of the cutout part 34 forms a partially covered part 32. This completes the lead wire 16 side.

As shown in FIG. 6, after the lead wire 16 with the heat shrink tube 28 is arranged on the back side of the diaphragm 18, the tip of the lead wire 16 is first inserted into the through hole 20 on the outside in the radial direction of the diaphragm 18 on the back side. Pass the tip of the lead wire 16 from the side to the front side, and then insert the tip of the lead wire 16 into the radially inner through hole while keeping the lead wire 16 from directly contacting the diaphragm 18 with the cutout 34 facing away from the diaphragm 18. 20 from the front side to the back side. The end of the lead wire 16 is bent into a hook shape.

After that, if the other end of the lead wire 16 is slightly pulled, a bending reaction force will be generated on the lead wire 16 at the radially outer through hole 20 portion, and the frictional force between it and the diaphragm 18 will become large. The lead wire 16 is easily fixed to the diaphragm 18.

Since the lead wire 16 is fixed to the diaphragm 18 in this manner, the end of the voice coil lead wire 24 can be easily fixed to the lead wire 16 exposed from the cutout 34 by soldering or the like.

Finally, adhesive is applied around the heat shrink tube 28 to secure the lead wire 16 to the diaphragm 18.

Note that the hook-shaped bent portion of the lead wire 16 has a slight radius, so that the lead wire 16 and the diaphragm 18 are connected between the through hole 20.
A clearance is created between the lead wires 16 and the diaphragm 18, and by filling this clearance with adhesive, reliable insulation can be obtained between the lead wires 16 and the diaphragm 18.

[Effect of idea]

As explained above, according to the speaker according to the present invention, since both ends of the insulating tube are left and a part of the center is cut out and attached to the lead wire, it is compatible with the two through holes for fixing the lead wire on the diaphragm. Since two insulating parts separated by a predetermined distance can be obtained in one work process, the work of connecting the lead wire and the voice coil can be performed quickly and easily, and automation is also facilitated.

In addition, since the material of the bobbin is not limited and fewer parts are used, there is no increase in parts costs, and the length from the bobbin coil to the corn neck can be shortened, making it possible to maintain good electro-acoustic conversion characteristics. It has this excellent effect.

[Brief explanation of the drawing]

FIG. 1 is a partially omitted sectional view of a speaker according to an embodiment of the present invention, FIGS. 2 to 4 are schematic diagrams showing how to connect the voice coil and lead wire in a conventional speaker, and FIG. FIG. 6 is a partially omitted enlarged view showing the main parts of FIG. 1 in detail. 10...Bobbin, 16...Lead wire, 18...
Vibration plate, 20...Through hole, 22, 28...Heat shrink tube, 24...Voice coil lead wire, 34
...Resection part.

Claims (1)

[Claims for Utility Model Registration] A conductive diaphragm 18 with two through holes 20 near the bobbin 10, a cutout 34 and a partial covering 32 in the center, and a complete diaphragm 18 at both ends. a single heat shrink tube 28 having a sheath 30 and a voice coil lead 24, the fully sheathed portion 30 of the heat shrink tube 28;
The end of the lead wire 16 is integrally fixed therein, and the heat shrink tube 28 is inserted and fixed in a hook shape from one of the two through holes 20 to the other while maintaining insulation, and the voice coil lead wire is fixed therein. 24 is connected to the lead wire 16 exposed from the cutout 34 of the heat shrink tube 28.