JPH0664945B2 - Method for manufacturing conductors for audio / visual equipment - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for manufacturing a conductor used for wiring equipment such as image display equipment and audio equipment that requires a high-frequency signal transmission circuit.

[Prior Art] In these electronic devices, unless signals are accurately transmitted without causing a phase difference, images and sound are adversely affected. That is, the image may be blurred or the sound may not be clear.

Conventionally, as conductors for audio / imaging equipment, tough pitch copper and oxygen-free copper have been annealed and softened to recrystallize after cold working, hard copper wire as cold-worked, or tin plated on these. Wires and the like have been used.

[Problems to be Solved by the Invention] However, these lines were not necessarily convenient for accurate transmission of signals for the following reasons.

In the case of annealed copper wire, recrystallization by annealing usually causes the crystal grains to be distributed in an equiaxed shape. Therefore, when a current flows in the longitudinal direction of the conductor, the number of crystal grain boundaries that the current may cross increases. It is considered that such a crystal grain boundary greatly acts as a cause of a phase difference or the like due to a high frequency signal.

On the other hand, in the hard copper wire, since the crystal grains extend in the longitudinal direction in a fibrous form, the number of crystal grain boundaries that the current may cross is apparently smaller than that in the soft copper wire. Therefore, the adverse effect of the crystal grain boundary is more likely to occur than that of the annealed copper wire. On the other hand, the density of atomic vacancies (point defects) and dislocations (line defects) becomes extremely larger than that of annealed copper wire, and moreover, there are many nonuniform electron densities that are inappropriate for electrical conduction. It is considered that these cause a phase difference in the high frequency component signal.

The present invention has been made to solve the above-mentioned problems, and an object thereof is to provide a method for manufacturing a conductor for audio / visual equipment having excellent signal transmission characteristics.

[Means for Solving Problems] and [Operation and Effect] A method for manufacturing a conductor for audio / visual equipment according to the present invention is
A copper material having an oxygen content of 30 ppm or less and a single crystal structure or a unidirectionally solidified structure is subjected to cold working in a range of 20 to 60% to draw a wire of a predetermined size. It is characterized by doing.

A copper material having an oxygen content of 30 ppm or less is used because if the oxygen content exceeds 30 ppm, Cu ₂ O will be present at the grain boundaries.
Grains are present, which makes the copper extremely brittle and adversely affects sound and images.

The reason why a copper material having a single crystal structure or a unidirectionally solidified structure is used is that the number of crystal grain boundaries that may cross when a current flows decreases.

A copper material satisfying the above conditions is subjected to cold working with a surface reduction rate in the range of 20 to 60% to draw a wire of a predetermined size. Here, in the cold working with a surface reduction rate of more than 60%, there is a possibility that the effects of sound and image sharpening may be impaired due to defects (point defects, dislocations, etc.) introduced by this working, and as a conductor. It is easy to lose suppleness. On the other hand, in cold working with a surface reduction rate of less than 20%,
It is too soft to be used as a conductor for imaging equipment.

As described above, according to the present invention, it is possible to easily manufacture a conductor that can make the sound and image clear without requiring any special treatment process.

[Example] Various element conductors were prepared, and 19 of each element conductor were combined into a stranded wire to obtain a desired covered wire. Sample numbers 1 to 9 were attached to the coated wires thus obtained. Sample Nos. 1 to 3 are examples of the present invention,
Sample numbers 4 to 6 are comparative examples, and sample numbers 7 to 9 are conventional examples. This sample was used as a wiring wire for stereo and video. The results are shown below. The single crystal body and the unidirectionally solidified material described below were obtained by the Bridgman method. The relative evaluation of image / sound quality shows a comparative value when the image / sound quality of sample No. 7 (resolution, delicate feeling, transparency, image density, timbre, etc.) is set to 10.

(1) Sample No. 1 (Example of the present invention) Prepared element conductor: Diameter of 99.99% Cu 0.2
A wire with a diameter of 0.18 mm obtained by drawing an 8 mm single crystal.

Area reduction: 58.7% Oxygen content: 9 ppm Tensile strength: 34.4 kg / mm ² Relative evaluation of image and sound quality: 51 (2) Sample No. 2 (Example of the present invention) Prepared element conductor: 99.99 % Cu diameter 0.2
8mm unidirectionally solidified material is drawn into a wire with a diameter of 0.18mm.

Area reduction rate: 58.7% Oxygen content: 9 ppm Tensile strength: 35.1 kg / mm ² Relative evaluation of image and sound quality: 49 (3) Sample No. 3 (Example of the present invention) Prepared element conductor: 99.999 % Cu diameter 0.
A 28 mm single crystal body drawn into a wire with a diameter of 0.18 mm.

Area reduction: 58.7% Oxygen content: less than 1 ppm Tensile strength: 33.9 kg / mm ² Relative evaluation of image and sound quality: 55 (4) Sample No. 4 (comparative example) Prepared element conductor: 99.99 Diameter of 2.6% Cu
A wire with a diameter of 0.18 mm obtained by drawing a mm single crystal.

Area reduction: 99.5% Oxygen content: 9ppm Tensile strength: 58.7kg / mm ² Relative evaluation of image and sound quality: 16 (5) Sample No. 5 (comparative example) Prepared element conductor: 99.99% Diameter 0.7 made of Cu
mm unidirectionally solidified material was drawn into a wire with a diameter of 0.18 mm.

Area reduction: 93.4% Oxygen content: 9ppm Tensile strength: 43.6kg / mm ² Relative evaluation of image and sound quality: 16 (6) Sample No. 6 (Comparative example) Prepared element conductor: 99.98% Diameter of Cu 0.2
8mm unidirectionally solidified material is drawn into a wire with a diameter of 0.18mm.

Area reduction: 58.7% Oxygen content: 70ppm Tensile strength: 35.2kg / mm ² Relative evaluation of image and sound quality: 12 (7) Sample No. 7 (conventional example) Created element conductor: 99.99% A wire made of Cu and having a diameter of 8 mm is drawn into a wire having a diameter of 0.18 mm, which is further softened.

Area reduction: 0% Oxygen content: 9ppm Tensile strength: 24.0kg / mm ² Relative evaluation of image and sound quality: 10 (8) Sample No. 8 (conventional example) Prepared element conductor: From 99.95% Cu A wire with a diameter of 8 mm is drawn into a wire with a diameter of 0.18 mm and softened.

Area reduction: 0% Oxygen content: 307ppm Tensile strength: 24.2kg / mm ² Relative evaluation of image and sound quality: 5 (9) Sample No. 9 (conventional example) Prepared element conductor: 99.99% Cu A wire with a diameter of 8 mm is drawn into a wire with a diameter of 0.18 mm.

Area reduction rate: 99.99% Oxygen content: 9 ppm Tensile strength: 61.3 kg / mm ² Relative evaluation of image and sound quality: 9 [Discussion on Examples] Sample Nos. 1 to 3 (present invention examples) are samples. The image and sound quality were much better than those of Nos. 4-9. In addition, sample number 1,
Those of 2, 3, 6, 7, and 8 were extremely supple as compared with sample numbers 4, 5, and 9.

From the above results, it is recognized that the conductor and the sound obtained by the method of the present invention have very good image and sound quality and can be effectively used as a wiring wire for audio / visual equipment.

Claims (1)

[Claims] 1. A copper material having an oxygen content of 30 ppm or less and having a single crystal structure or a unidirectionally solidified structure has a reduction in area of 20.
A method for producing a conductor for audio / visual equipment, which comprises drawing a wire of a predetermined size by performing cold working in the range of -60%.