JPH0673250B2 - Acoustic / imaging equipment conductor and method of manufacturing the same - Google Patents

Description

TECHNICAL FIELD The present invention relates to a conductor used for wiring of audio equipment such as stereos and VTRs and image equipment.

[Prior Art] Conventionally, various conductors have been studied as electric wires used for this type of application. In recent years, it has been desirable that the presence of different kinds of elements including components such as oxygen in the conductor is small.

[Problems to be Solved by the Invention] However, it is difficult to maintain the entire conductor with high-purity copper. This is because, for example, if a raw material ingot made of high-purity copper is remelted or cast, in many cases, different elements or foreign substances are mixed during the process, and high purity cannot be maintained. After all, good sound and images could not be obtained with conventional conductors for audio / visual equipment.

Therefore, it is an object of the present invention to provide a conductor for audio / visual equipment capable of obtaining high-quality sound and images and a method for manufacturing the same.

[Means for Solving Problems] The conductor for audio / visual equipment according to the present invention has a purity of 99.99.
% Or more of the copper wire is coated with 99.999% or more pure copper.

The method for manufacturing a conductor for audio / visual equipment according to the present invention is characterized in that the surface of a copper wire having a purity of 99.99% or more is coated with copper having a purity of 99.999% or more by a vapor phase method.

[Advantageous Effects of the Invention] A high-frequency signal current for sound or image flows near the surface layer of the conductor due to the skin effect. The inventor of the present application focused on this.

That is, according to the conductor of the present invention, the core material has a purity of 99.99.
% Copper or more, but the surface layer portion through which the high-frequency signal current flows is made of high-purity copper with a purity of 99.999% or more. Therefore, the high frequency current flows under a small AC resistance, and flows without causing a phase difference due to the influence of the impurity element. Thus, by using the conductor for audio / visual equipment according to the present invention, it is possible to obtain high-quality audio and images.

Further, since the metal of the core material and the coating metal are the same copper, the obtained wire is electrochemically stable, and the risk of corrosion from the end face can be reduced. Further, the adhesion between the core metal and the adhered metal is also good.

The copper coating with a purity of 99.999% or more is realized by a vapor phase method, a hot dip coating method, a wire drawing process and the like.

On the other hand, according to the method of the present invention, copper having a purity of 99.999% or more is coated by the vapor phase method. Compared with other coating methods, the coating by the vapor phase method is easier to manage for high purification and cleaning. Therefore, it is possible to easily coat the surface of the core member with clean and high-purity copper containing no foreign matter.

As a coating method by a vapor phase method, physical vapor deposition such as a sputtering method and chemical vapor deposition such as a plasma CVD method can be adopted. If the coating is performed by the sputtering method, a wide range of materials can be attached with strong adhesion. Also,
The coating by the chemical vapor deposition method uses a gas that is easily generated, and enables high-purity and high-quality deposition.

After coating with high-purity copper by the vapor phase method, cold plastic working is preferably performed so that the area reduction rate of the cross-sectional area is in the range of 20 to 90%. By this plastic working, the obtained sound and image are of higher quality. If the area reduction rate is less than 20%, the effect of improving the sound / image is not sufficient. Such an improvement effect is almost saturated when the area reduction rate is about 90%. Therefore, if the surface reduction rate exceeds 90%, further improvement effect cannot be expected, and the flexibility may be deteriorated.

[Example] Example 1 A surface of a copper wire having a purity of 99.99% and a purity of 99.
Coated with 999% copper. The conductor thus obtained was cold-worked using a die so that the cross-sectional area reduction rate was 70%. FIG. 1 is a sectional view showing the conductor 1 thus obtained. The core portion 2 is copper having a purity of 99.99%, and the surface layer portion 3 is copper having a purity of 99.999%. Also, the outer diameter is 0.12 mm,
The coating thickness of high-purity copper was 0.01 mm.

In order to use this conductor 1 as a VTR wiring electric wire, it was processed into an electric wire as a 7-stranded conductor as shown in FIG.

Then, the state of the sound and image of the VTR was compared with that of an electric wire made of a conventional conductor of the same wire diameter made of oxygen-free copper soft material. As a result, when the conductor 1 of the present invention obtained as described above was used, the sound was remarkably rich and clear, and the image was clear.

Example 2 The surface of a copper wire having a purity of 99.99% was coated with copper having a purity of 99.999% by a plasma CVD method to prepare a tape-shaped conductor 4 as shown in FIG. When this was punched and used as a lead material for a transistor for a stereo, the sound was clearer and a good sound effect was obtained as compared with the case where a conventional lead of oxygen-free copper was used.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a conductor obtained in Example 1. FIG. 2 is a cross-sectional view of a stranded wire conductor using the conductor 1 shown in FIG. FIG. 3 is a cross-sectional view of the tape-shaped conductor obtained in Example 2.

Claims (5)

[Claims] 1. The surface of a copper wire having a purity of 99.99% or more has a purity of 99.
A conductor for audio and visual equipment that is coated with 999% or more of copper. 2. A method for producing a conductor for audio / visual equipment, which comprises coating the surface of a copper wire having a purity of 99.99% or more with copper having a purity of 99.999% or more by a vapor phase method. 3. The method for producing a conductor for audio / visual equipment according to claim 2, wherein the coating by the vapor phase method is performed by a sputtering method. 4. The method for producing a conductor for audio / visual equipment according to claim 2, wherein the vapor phase coating is performed by a chemical vapor deposition method. 5. The cross-sectional area reduction rate after the coating step is 20 to 90.
The method for producing a conductor for audio / visual equipment according to any one of claims 2 to 4, wherein cold plastic working is performed so as to be in a range of%.