JPH0694587B2 - Method for manufacturing conductor for image display device and audio device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to wiring of image display devices such as TVs and CRTs (Cathode Ray Tubes) and devices requiring high-frequency signal transmission circuits of audio devices such as stereos. The present invention relates to a method for manufacturing a conductor used in.

(Background Art) In these electronic devices, if signals are not accurately transmitted without causing a phase difference, an image or sound may be blurred or sound may not be clear.

Conventionally, tough pitch copper (pure copper containing about 200 to 500 ppm oxygen) or oxygen-free copper (pure copper containing almost no oxygen) is cold-worked, then annealed and softened to recrystallize annealed copper wire or sometimes as cold-worked. The hard copper wire of the above, or the wire to which tin or the like is plated has been used for these applications.

However, these lines have not always been convenient for the accurate transmission of signals for the following reasons.

The annealed copper wire is often used because it is excellent in flexibility, but since the crystal grains are usually distributed in a shape close to the equiaxed shape by recrystallization by annealing, the crystal grains that will cross when a current flows in the longitudinal direction of the conductor. It is considered that the number of boundaries increases and the crystal grain boundaries act significantly as a cause of phase difference generation, especially for high frequency component signals.

In the case of a hard copper wire, since it has a shape of a crystal that extends in the longitudinal direction in a fibrous shape compared to an annealed copper wire, when an electric current flows in the longitudinal direction, the crystal grain boundaries that will cross are apparently less than the point.
Although it is not easily affected by crystal grain boundaries, the density of atomic vacancies (point defects) and dislocations (linear crystal defects) is much higher than that of annealed copper wire, and the electron density is inhomogeneous, which is inappropriate for electrical conduction. It is considered that this also causes a phase difference for a high frequency component signal.

DISCLOSURE OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems, and makes the crystal structure similar to that of hard copper to reduce the number of crystal grain boundaries that must pass when a current flows in the longitudinal direction. The present invention also provides a method for producing a conductor for an image display device and an audio device, which can reduce the density of point defects and dislocations and prevent the occurrence of a phase difference when a current flows.

The present invention is a pure copper having a purity of 99.95% or higher, after casting, after cold working, after hot working or after intermediate annealing, image display equipment characterized by performing warm working, a method for producing a conductor for audio equipment. Is.

The conductor to which the present invention is applied is, for example, a conductor used for wiring an image display device such as a TV or CRT or an audio device such as a stereo, but is not limited to a signal transmission circuit, and a single wire, It is used in the state of a single wire plated with tin, solder or the like or a twisted wire formed by twisting a plurality of these wires. The cross-sectional shape of the conductor may be circular, elliptical, quadrangular, or any other irregular shape.

In the present invention, as pure copper having a purity of 99.95% or more, oxygen-free copper, tough pitch copper (oxygen 200 to 500 ppm) and the like are used, and the purity of 99.95% or more is defined as less than 99.95% of point gaps and dislocations. This is because the density is less likely to be reduced, and the impurities existing in a solid solution state are likely to cause inhomogeneity in the electron density distribution.

Hereinafter, the present invention will be described by way of examples with reference to the drawings. 1 to 6 are process diagrams showing the manufacturing process of an embodiment of the method of the present invention. In the present invention, warm working is performed after casting (Fig. 1), after hot working (Fig. 2), and after cold working (3rd,
(Fig. 5) and after intermediate annealing (Figs. 4 and 6).

In the present invention, warm working means rolling or wire drawing while being heated to a temperature of recrystallization or lower. The actual working temperature varies depending on the cold working, warm working degree, working speed, etc., but is 100 ° to 300 ° C, preferably 15 ° C.
About 0 ° to 250 ° C is suitable. If it is less than 100 ° C., the atomic vacancy concentration and dislocation density increase during processing, and if it exceeds 300 ° C., the crystal structure becomes grainy, resulting in the problem that occurs in the case of the annealed copper wire. The conductor of the present invention is wise to avoid the formation of copper oxide, which is a cause for easily causing a signal phase difference on the surface of the conductor, and prevents the surface of the conductor from being oxidized during warm working. It is preferably carried out in an oxidizing atmosphere.

By such warm rolling or wire drawing, the crystal structure is in a state in which the shape of crystal grains is parallel to the longitudinal direction similar to hard copper, and the density of point defects and dislocations in the crystal is less than that of hard copper. .

(Example) Using various copper materials shown in Table 1, a copper wire having a diameter of 0.12 mm was prepared by the processing method shown in Table 1.

Applying an insulation coating of polyvinyl chloride to the twisted wire made by twisting 11 of this copper wire and using it as an electric wire for wiring inside and outside the TV,
The image and sound clarity was evaluated by 100 people, and compared with the one using the conventional conductor, it was evaluated as clear by more than 80 people. did.

From Table 1, it can be seen that the conductor according to the present invention is superior in sharpness in both image and sound as compared with the conventional example and the comparative example.

(Effects of the Invention) The method of manufacturing a conductor for an image display device and an audio device of the present invention configured as described above has the following effects.

(A) Pure copper with a purity of 99.95% or more is cast, cold-worked, hot-worked or after intermediate annealing, and is subjected to rolling or wire drawing at a temperature of 150 ° to 250 ° C. ,
The crystal structure is similar to that of hard copper in that the shape of the crystal is parallel to the longitudinal direction, there are few crystal grain boundaries that must pass when a signal current flows, and the density of point defects and dislocations in the crystal is higher than that of hard copper. Since the image and acoustic signal currents flow accurately with no phase difference, it is possible to manufacture a conductor in which the image of the image display device is clear and the sound of the audio device is clear and beautiful.

(B) Since no special material is used and the production is simple and easy, the conductor can be industrially produced easily and inexpensively.

[Brief description of drawings]

1, FIG. 2, FIG. 3, FIG. 4, FIG. 5, and FIG. 6 are process drawings showing the manufacturing process of the embodiment of the method of the present invention.

Claims (1)

[Claims] 1. Pure copper having a purity of 99.95% or more, after casting, after cold working, after hot working or after intermediate annealing, in a non-oxidizing atmosphere,
A method for producing a conductor for image display equipment and audio equipment, which comprises rolling or drawing at 150 ° to 250 ° C.