JPS6011401B2 - copper foil thread wire - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a steel foil thread wire used as a lead wire from a voice coil of a speaker, and aims to provide a highly reliable wire with excellent heat resistance and precipitation resistance. It is.

Generally, a speaker is constructed as shown in FIG.

That is, a plate 2 with a center pole 1, a ring-shaped magnet 3, and a ring-shaped upper plate 4.
A frame 6 is coupled to a field part 5 constituted by,
A gasket 7 and a diaphragm 8 are connected to the peripheral edge of the frame 6, and a voice coil 9 is connected to the center of the diaphragm 8. The diaphragm 8 is held in the magnetic gap 11 of the diaphragm 5 without deviation D, and a dust cap 12 is attached to the upper center surface of the diaphragm 8. With this configuration, the voice coil 9 has both ends of its winding pulled out from the diaphragm 8 to the central part, and a copper foil thread wire 14 connected between the central part of the diaphragm 8 and the terminal 13 provided on the frame 6. They are connected to form an input signal circuit.

By the way, since the copper foil thread wire 14 follows the vibration of the diaphragm 8, it has a structure with excellent folding durability.

That is, as shown in FIG. 2, it is formed by winding a steel foil 16 around a core yarn 15 made of cotton, and twisting or vertically assembling this. However, the copper foil thread wire 1 with this configuration
In No. 4, the core yarn 15 undergoes severe carbonization due to the high temperature during soldering, and the core yarn 15 is damaged due to mechanical friction between the steel foil 16 and the core yarn 15, resulting in decreased bending durability and fin erosion. Due to a combination of factors such as corrosion and corrosion, wires were prone to breakage.

The present invention eliminates the drawbacks of the prior art as described above.

Hereinafter, the copper foil thread wire of the present invention will be explained with reference to FIGS. 3 and 4.

17 is a core thread made of cotton thread, glass fiber thread, or chemical fiber thread with excellent heat resistance, and a metal 18 such as copper or silver, which has good conductivity and solderability, is attached to the surface of this core thread 17. ing.

The metal 18 can be attached by placing the core yarn 17 in a vacuum chamber and depositing metal powder, or by depositing metal powder on the core yarn 17.
This can also be done by applying an adhesive to 7 and attaching metal powder to this adhesive. Copper foil 19 is spirally wound around the core yarn 17 having metal 18 attached to its surface to form a steel foil yarn wire.

By forming the metal layer 18 on the surface of the core yarn 17 in this way, not only the solderability is improved, but also the heat during soldering is dispersed by the metal layer 18, resulting in local carbonization of the core yarn 17. Deterioration is reduced, and the moisture resistance of the core yarn 17 is improved, the electrical resistance is improved, and the yarn is resistant to corrosion and crab attack.

Furthermore, the mechanical friction between the steel foil 19 and the core yarn 17 is also caused by the metal layer 18
Z eliminates this problem, improves precipitation resistance, and significantly improves reliability. Next, specific characteristics will be shown in comparison with conventional products.

The secondary copper foil thread wire used here is one in which the core thread is braided with four copper foils wrapped around it, and the copper foil thread wire of the present invention Z has a metal layer formed on the core thread, These are the characteristics of a four-strand braided wire wrapped with copper foil. [ ] Conventional product 1.000/Invented product 0. [Folding durability under soldering temperature conditions (approximately 300qo-3 seconds)] Conventional product 450 times Invention product
As shown in more than 640 times, the copper foil thread wire of the present invention is excellent in many aspects such as electrical resistance, precipitation resistance, corrosion resistance, and mechanical strength, and can be made highly reliable, making it suitable for high-quality speakers. It is extremely effective in obtaining the desired results and is of great industrial value.

[Brief explanation of the drawing]

Fig. 1 is a half-sectional view showing a general speaker, Fig. 2 is a sectional view showing a conventional steel foil thread wire, and Fig. 3 is a perspective view showing an embodiment of the steel foil thread wire of the present invention. Figure 4 is a sectional view of the same. 17... Core yarn, 18... Metal layer, 19... Steel foil. Figure 1 Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] 1. A copper foil yarn wire characterized by forming a metal layer on the surface of a lightweight and flexible core yarn, and winding copper foil on the metal layer. 2. The copper foil thread wire according to claim 1, wherein a metal having excellent conductivity and solderability is used as the metal layer. 3. The copper foil thread wire according to claim 1, wherein the core wire is made of cotton thread, glass fiber thread, or chemical fiber thread with excellent heat resistance.