JPH0352077Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to an improvement in a lead wire drawing method for an electrodynamic speaker in the field of electroacoustic equipment.

[Conventional technology]

One end of the lead wire that introduces a signal current into the voice coil of an electrodynamic speaker is connected to the voice coil winding, and the other end is connected to the speaker terminal, but the connection with the voice coil winding is connected to the vibration system. It is usually fixed to the diaphragm surface or the voice coil bobbin side surface, etc., in order to prevent wire breakage due to repeated stress caused by vibration displacement.

Among these, in order to eliminate the negative influence of the lead wire fixing part on the diaphragm in high-end speakers, especially dome-shaped speakers, etc., the voice coil 21 winding end 21a and the lead wire 23 joint part are glued on the side of the voice coil bobbin 22, as shown in FIG. The lead wire 23 is pulled out in a tangential direction with respect to the voice coil bobbin 22 in order to reduce the influence on the compliance of the vibration system.

[Problems to be solved]

In the lead wire 23 drawing method according to the above-described conventional technology, when the vibration system is displaced, the lead wire 23 is pulled in the direction of the speaker terminal 24 by an amount corresponding to Δ, as shown by the dotted line, and is coupled to the lead wire 23. Tension and bending moment are repeatedly applied to the winding end 21a of the voice coil 21.
There was a drawback that a was easily broken.

[Means for solving problems]

The electrodynamic speaker of the present invention, which aims to solve the above-mentioned drawbacks of the conventional example, has a diaphragm attached to the upper end of a voice coil bobbin 2 around which a voice coil 1 is wound, as shown in FIG. 5 is glued, one end is connected to the winding end 1a of the voice coil 1 and fixed to the side surface of the voice coil bobbin 2, and the other end is connected to the speaker terminal 4. A signal current is passed through the lead wire 3 to the voice coil. 1, the lead wire 3 is bonded to the side surface of the voice coil bobbin 2, pulled out in the tangential direction of the voice coil bobbin 2, and connected to the speaker terminal 4. , an extension part 1b of the winding end 1a of the voice coil 1 is led out in parallel along the lead wire 3 in a direction opposite to the lead-out direction of the lead wire 3, and is bonded to the side surface of the voice coil bobbin 2. , is characterized in that the tip of the extension portion 1b is connected to the lead wire 3.

[Effect]

According to the method of connecting the lead wire and the voice coil winding end as described above, even when a tensile force is generated in the lead wire as explained in the conventional example at the time of large amplitude,
The stress acts as a compressive force on the voice coil winding end, and even if it is repeatedly applied for a long time, the winding end does not break, and the speaker can be made durable against large inputs.

〔Example〕

The joint portion between the voice coil winding end and the lead wire, which is a feature of the present invention, will be explained in detail with reference to FIG. 1 using a dome-shaped speaker as an example.

In FIG. 1, reference numeral 2 denotes a voice coil bobbin, which is generally made of a highly rigid material with little elasticity, and has a voice coil 1 wound around its lower end, and a diaphragm 5 and supporting members such as edges or dampers at its upper end. 6 are glued together.

The winding end 1a of the voice coil 1 is pulled upward by a length corresponding to the required amplitude, and then bent in the horizontal direction to form an extension 1b along the side surface of the voice coil bobbin 2, and the end of the extension 1b is It is connected to the lead wire 3 by soldering or the like.

The lead wire 3 is generally made of a highly flexible conductor such as a twisted wire called tinsel wire or a metal strip, and has an extension portion 1 near the joint with the winding end 1a.
The voice coil bobbin 2 is bonded to the side surface of the voice coil bobbin 2 with an adhesive along the extension portion 1b, and then separated from the extension portion 1b and pulled out in the tangential direction of the voice coil bobbin 2, and connected to the speaker terminal 4.

〔effect〕

Conventional dome-shaped speaker shown in Figure 2 (diaphragm diameter 25 mm, rated input 100 W, tinsel wire used as lead wire, operating frequency range 2.5 KHz to 45 KHz)
When the lead wire extraction method is configured according to the present invention as shown in Figure 1, the frequency band is 1.5KHz to 1.5KHz with the same allowable input for 96 hours of continuous load test.
When expanded to 45KHz, the disconnection rate is 2% (conventional example in the test under the same conditions is 36%), and when the input is increased by 3dB in the same frequency band, the disconnection rate is 0%.
(Similarly, the conventional example was 10%), so it is clear that the method of connecting the lead wire and voice coil winding of the present invention is extremely effective in improving the input resistance of the speaker.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway perspective view of the vibration system of the electrodynamic speaker of the present invention, and FIG. 2 is a side view of the vibration system of a conventional example. 1 is a voice coil, 1a is a voice coil winding end, 1b is an extension part, 2 is a voice coil bobbin, 3
4 is a lead wire, 4 is a speaker terminal, and 5 is a diaphragm.

Claims (1)

[Scope of utility model registration request] A diaphragm 5 is bonded to the upper end of the voice coil bobbin 2 around which the voice coil 1 is wound, one end is connected to the winding end 1a of the voice coil 1 and fixed to the side surface of the voice coil bobbin 2, and the other end is connected to the speaker. In an electrodynamic speaker configured such that a signal current is applied to the voice coil 1 by a lead wire 3 connected to a terminal 4, the lead wire 3 is bonded to the side surface of the voice coil bobbin 2, and the voice coil bobbin 2 is pulled out in the tangential direction and connected to the speaker terminal 4, and an extension part 1b of the winding end 1a of the voice coil 1 is led out along the lead wire 3 in a direction opposite to the direction in which the lead wire 3 is pulled out. An electrodynamic speaker characterized in that it is bonded to a side surface of the voice coil bobbin 2 and is connected to a lead wire 3 at the tip of the extension 1b.