JPH08959B2 - Manufacturing method for audio and image copper wire - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for producing a copper wire used for audio equipment such as a stereo and a copper wire for images.

[Prior Art] In recent years, a digital recording or reproducing technique has spread by using light like a compact disc (CD).
In comparison with the conventional analog signal recording or reproducing method for electric signals, sound recording or reproducing is expanding the range and its accuracy, and it is becoming possible to reproduce sounds with a lot of realism.

Then, there is a proposal for improving the copper wire in order to reproduce a good quality sound. For example, the one described in JP-A-59-167904 is an oxygen-free copper wire having an oxygen content of 50 ppm or less annealed in an inert gas atmosphere of 700 ° C. or more to coarsen the crystal grains,
Trying to get a high degree of sound quality.

[Problems to be solved by the invention] Currently, in audio equipment, speaker cables between amplifiers and speakers, tape recorders, pin codes between CDs and amplifiers, etc., use power transmission cables by analog methods and CD by quality
During playback, amplification, and transmission to the speaker of the sound recorded in, noise and distortion were added and the sound quality was deteriorated. Therefore, there is a demand for an audio copper wire capable of transmitting not only a CD but also an electric signal from a tape recorder, a record player, or the like accurately without adding noise or distortion.

[Means for Solving the Problems] In the production of audio and image copper wires, the material is processed into a single wire, and then processed into twisted wire, braided wire, core extrusion, sheath extrusion, etc. The present invention is characterized by performing strain relief annealing at 50 to 300 ° C. in such a manufacturing process.

Processes such as twisting a single wire, braiding, heat treatment, core extrusion, and sheath extrusion can be performed under appropriate desired conditions and combinations, but the present invention using high-purity copper as a material is the following method. .

A hard drawn copper wire with a copper purity of 99.9996% or more is twisted, recrystallized and annealed, then braided or processed from the core, and then strain relief annealing is performed at 50 to 300 ° C. And a method for producing a copper wire for an image (Claim (1)) A recrystallized annealed copper wire having a copper purity of 99.9996% or more is twisted, braided or twisted and then braided, and then 50 to 300 Method for producing audio copper wire characterized by performing strain relief annealing at ℃ (Claim (2)) The copper wire used in the present invention has a copper purity of 99.9996% or more. By keeping the total amount of impurities below 4ppm,
Impurity solid solution or precipitation can be reduced to 1/10 or less compared to the conventional audio oxygen-free copper wire, and noise or distortion to electrical signals due to impurity solid solution or precipitates, etc. Lower.

In the above invention, a hard drawn copper wire having such a purity is subjected to twisting, recrystallization annealing, then braiding or processing from the core, and then annealed at 50 to 300 ° C. This is because distortion added to the inside of the wire by twisting or braiding causes distortion of the sound quality, especially in the high frequency range.
This is because it was found that by performing strain relief annealing at a temperature of ℃ or more and 300 ° C or less, excellent sound quality can be obtained at the same level as that of an electric wire before the hard drawn wire is twisted or braided. In particular, since 99.9999% or more of copper has a sufficient strain relief annealing temperature of about 100 ° C., it can be heated from above the coating even after the insulation coating of the electric wire.

In the above invention, the copper wire is first recrystallized and annealed, and then the twisted wire is subjected to the strain relief annealing.

The recrystallization annealing temperature is 300 ° C or higher and 800 ° C or lower. It has been found that by such a treatment, the distortion between the copper atoms and the lattice defect are recovered, the distortion of the sound is uniformly removed from the low tone range to the high tone range, and excellent sound quality extremely close to the original sound is obtained. Under such conditions of recrystallization annealing, excellent sound quality can be obtained in batch type annealing using a vacuum or inert gas atmosphere furnace. For example, by heating at 300 ° C. for 2 hours, the produced electric wire is recognized to have improved sound quality, and by holding it for 10 hours or more, excellent sound quality is obtained. Also, at 400 ° C, excellent sound quality can be obtained by holding for 2 hours or more. Incidentally, in batch annealing, 300 ℃ or less, for example 200 ℃ for 240 hours, further 100
When kept at 700 ℃ for 700 hours, recrystallization gradually progresses and desirable sound quality is obtained, but it requires a long time for annealing and is not practical.

In the continuous annealing method, for example, the wire diameter of 0.1 mmφ is 600 ° C., the wire diameter of 0.12 mmφ is 650 ° C., the wire diameter of 0.18 mmφ is 700 ° C., and the recrystallized structure by heating within 15 seconds, respectively. Develops and obtains excellent sound quality.

[Examples] Example 1 A 0.18 mmφ hard-drawn copper wire was made from a 6 mmφ wire material having a copper purity of 99.99995% or more, 7 strands of this were twisted, and then crystallized and annealed. did.

This flat braided wire that has been annealed is strain-relieved and annealed at 120 ° C. for 100 minutes, and then insulation-coated by core extrusion using a soft polyethylene resin, and its outer periphery is coated with a molten polyvinyl chloride resin by sheath extrusion, and an electric wire for audio is used. And

Using this electric wire and an oxygen-free copper wire having a copper purity of 99.99% as a comparative example, a speaker cord was subjected to an acoustic test.
As a result, compared with the comparative example product, the example product has less noise and distortion of the sound in the entire range from the low tone range to the high tone range, and can reproduce the sound remarkably faithful to the original sound.

Example 2 A 0.54 mmφ hard-drawn copper wire was made from a 6 mmφ wire material having a copper purity of 99.99995% or more, recrystallized and annealed, and an insulator was covered with polyethylene, and then four cores were twisted, and a polyvinyl chloride first sheath was used. After extrusion, strain relief annealing was performed at 100 ° C. for 8 hours, and then second sheath extrusion was performed to obtain a pin cable. This one also had little noise or distortion in the low to high range, and could reproduce a sound that was extremely faithful to the original sound.

Example 3 Seven pieces of 0.54 mmφ hard drawn copper wire having a copper purity of 99.99995% or more were twisted together, and a recrystallized annealed soft wire was used, and this was insulation-coated with a soft polyethylene resin, and the same as in Example 2 below. It processed and made it into the speaker cable. as a result,
Compared to a cable processed under the same conditions without distortion removal, excellent sound quality was obtained that was extremely faithful to the original sound and had little distortion in the entire range from the low range to the high range.

[Effects of the Invention] The present invention uses a high-purity copper wire and combines twisted wire processing, braided wire processing, and heat treatment to obtain a copper wire for audio with significantly excellent sound quality. If the sound quality to be reproduced is concretely expressed, it is possible to convey a detailed sound movement, clear reverberation, clear perspective of the instrument, and other sounds with a sense of reality.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yasushi Tanaka 4-2610 Hanazono, Tokorozawa-shi, Saitama Pioneer Co., Ltd. Tokorozawa factory (72) Inventor Norio Yamamoto 3-1735, Shinsōnan, Toda City, Saitama Japan Mining Industry Co., Ltd. (56) Reference JP-A-60-125357 (JP, A) JP-A-60-125358 (JP, A) JP-A-60-125359 (JP, A)

Claims (2)

[Claims] 1. A hard drawn copper wire having a copper purity of 99.9996% or more is twisted, recrystallized and annealed, then braided or processed from a core, and then strain relief annealing is performed at 50 to 300 ° C. Characteristic audio and visual copper wire manufacturing method. 2. A recrystallized annealed copper wire having a copper purity of 99.9996% or more is twisted, braided or twisted and then braided, and then subjected to strain relief annealing at 50 to 300 ° C. Manufacturing method for copper wire for audio and image.