JPH0524601B2 - - Google Patents

Description

[Detailed description of the invention]

(Industrial Application Field) The present invention is applicable to, for example, TV, CRT {Cathode Rey
The present invention relates to a method for manufacturing conductors used for wiring of image display devices such as tubes (cathode ray tubes) and devices that require high-frequency signal transmission circuits, such as audio devices and other audio devices. (Background Art) In these electronic devices, if signals are not transmitted accurately without creating a phase difference, the image or sound may become blurred or the sound may not be clear. Conventionally, annealed copper wires are made by cold-working tough copper (pure copper containing about 200 to 500 ppm of oxygen) or oxygen-free copper (pure copper containing almost no oxygen) and recrystallizing it by annealing and softening it, or sometimes leaving it cold-worked. hard copper wire,
Alternatively, wires plated with tin or the like have been used for these purposes. However, these lines are not always convenient for accurate signal transmission for the following reasons. Annealed copper wire is often used because it has excellent flexibility, but when recrystallized by annealing, the crystal grains are usually distributed in an almost equiaxed shape, so when a current flows in the longitudinal direction of the conductor, the crystal grains that would cross It is thought that the number of fields increases, and the grain boundaries act significantly as a cause of phase difference generation, etc., especially for high frequency component signals. In the case of hard copper wire, compared to annealed copper wire, it has a fibrous crystal shape that extends in the longitudinal direction, so when a current flows in the longitudinal direction, there are apparently fewer grain boundaries to cross. Although it is less susceptible to the adverse effects of grain boundaries, the density of atomic vacancies (point defects) and dislocations (linear crystal defects) is extremely high compared to annealed copper wire, and the electron density is non-uniform, making it unsuitable for electrical conduction. There are many such things,
This is also considered to be a cause of phase difference generation for high frequency component signals. (Disclosure of the Invention) The present invention has been made to solve the above-mentioned problems. It is an object of the present invention to provide a method for manufacturing a conductor for an image display device or an audio device that can prevent signal disturbance and phase difference from occurring. The present invention is a method for manufacturing a conductor for an image display device or an audio device, characterized in that after copper or silver is unidirectionally solidified in the longitudinal direction, cold working is performed by warm working. Conductors to which the present invention is applied include, for example, TVs,
Image display equipment such as CRT, video equipment, OA equipment, etc.
Or, for example, a conductor used for wiring audio equipment such as audio equipment, but not limited to signal transmission circuits, such as a single wire, a single wire plated with tin, solder, etc., or a plurality of these. It is used in the form of a twisted wire. The cross-sectional shape of the conductor may be circular, oval, square, or other irregular shapes. In the present invention, copper or silver is used as a raw material with purity
It is preferable to use 99.95% or more. If the purity is less than 99.95%, the presence of impurity atoms tends to create disturbances in the electronic structure of the crystal, which may cause disturbances in high-frequency signals and phase differences. Also, copper or silver with a purity of 99.95% or higher has high conductivity.
It is advantageous for signal transmission of high frequency signals. In the present invention, first, copper or silver is unidirectionally solidified in the longitudinal direction to create an ingot. As a result, the crystal grains in the ingot are arranged parallel to the longitudinal direction, and at this time, there is little difference in orientation between the crystal grains. Examples of methods for making ingots include Figures 1 and 2.
There is a method shown in the figure. The method shown in FIG. 1 is a method called the vertical Bridgeman method, in which a raw material 3 is charged into a container 2 maintained in a vacuum or inert atmosphere in a tubular heating furnace 1, and the raw material 3 is moved downward while the container 2 is moved downward. In this method, the ingot is melted sequentially from the bottom and then solidified to form the ingot 4. The ingot is solidified downward (in one direction) in the longitudinal direction from the bottom, and the crystal grains are arranged parallel to the longitudinal direction. The method shown in FIG. 2 is a method using a water-cooled mold 7 at the bottom, in which a container 6 containing raw material 3 placed on the water-cooled mold 7 is placed in a tubular heating furnace 5, and after melting the raw material 3, the bottom part is This is a method in which the water-cooled mold 7 is cooled with water and the metal is solidified from the bottom of the container 6. In this case as well, the ingot is solidified downward (in one direction) in the longitudinal direction from the bottom, and the crystal grains are arranged parallel to the longitudinal direction. In addition to the above-mentioned effect of arranging crystal grains, these methods also prevent foreign matter, impurities, and
It has the effect of moving gas upward and removing it. Note that the method for making an ingot in the present invention is the first method.
There is no limitation to the method shown in FIGS. The ingot is then elongated by cold working or warm working at a temperature range that does not cause recrystallization. These processes are characterized in that they are processed under conditions that do not cause recrystallization, and the orientation of the crystal structure obtained by the above-mentioned unidirectional solidification is maintained, and there are few grain boundaries that cross the longitudinal direction even after processing. The anisotropy between crystals is small, and the adverse effects of grain boundaries on images and sound are reduced.If recrystallization is performed during processing, the effect of the unidirectional solidification described above is reduced. In the present invention, heat treatment may be performed at a temperature range that does not cause recrystallization, if necessary, during or after the intermediate processing or warm processing. Here, the heat treatment after processing is performed to reduce defects such as point defects and dislocations that adversely affect images and sound. If recrystallization is performed at this time, the effect of the unidirectional solidification described above will be reduced.
Further, the heat treatment during processing is performed to prevent distortion of the crystal and to prevent the accumulated processing energy from becoming excessively large or concentrated. Example 1 Purity was determined by Bridgeman shown in Figure 1.
Using 99.99% copper as a raw material, an ingot with a diameter of 20 mm was created by unidirectional solidification. At this time, the solidified structure was parallel to the longitudinal direction. After lightly cutting the surface of this ingot and washing the surface,
A wire of 0.1 mmφ was produced by cold wire drawing and an intermediate heat treatment at 130°C for 1 hour (a heat treatment in which the crystal structure remains unchanged from before heating) three times. After twisting 19 of these wires together to make a twisted wire, it is heated to 130℃.
It was heat-treated for 1 hour to become a conductor. A set was fabricated using wires coated with this conductor as wiring wires inside and outside the video equipment and television. For comparison, conventional tough pitch copper wire (conventional example),
A similar set was made using insulation using 19/0.1 mm stranded conductors using oxygen-free conductors (comparative example). Table 1 shows the results of investigating the image and sound conditions for these sets.

[Table] From Table 1, it can be seen that the image and sound of the device according to the present invention are clearer than the conventional example and the comparative example. Example 2 An ingot with a diameter of 25 mm was produced by unidirectionally solidifying silver with a purity of 99.995% as a raw material using the ingot production method shown in FIG. 2. At this time, the solidified structure was parallel to the longitudinal direction. This ingot was subjected to warm wire drawing at a temperature without recrystallization to form a wire of 10 mmφ, and then cold wire drawn to form a fine wire of 0.3 to 0.05 mmφ. Using these thin wires, insulated wires were created using enamel-coated windings and 7 to 19 stranded conductors. These electric wires were used for internal wiring such as voice coils and pick-up cords of audio equipment for audio enthusiasts, and for equipment wiring between components. For comparison, a similar device was created using a conventional electric wire (conventional example) using tough pitch copper wire. A comparison of these sound systems revealed that, compared to conventional systems, the system using the present invention did not crack or distort the sound from high to low frequencies, and had a clear sound quality with a clear sense of transparency. We were able to obtain high-quality sound that was full of realism. (Effects of the Invention) The method for manufacturing a conductor for image display equipment and audio equipment of the present invention configured as described above has the following effects. (b) Copper or silver is unidirectionally solidified in the longitudinal direction, so the crystal grains are aligned parallel to the longitudinal direction, and there is no anisotropy between the crystals. Since it is then cold worked or warm worked, recrystallization occurs during processing. A conductor with crystal grains arranged parallel to the longitudinal direction and with little anisotropy between crystals can be obtained without causing any disturbance or phase difference in the image and acoustic signal currents flowing through the conductor. In display devices, whites become more vivid, colors become more vivid, and images become clearer. Also, with audio equipment, the sound is clear and transparent. (b) The unidirectional solidification method removes foreign substances and impurities that have a negative impact on images and sound, so
The sound becomes clearer. (c) Since there is little anisotropy between the conductor's crystals, there is little negative influence from grain boundaries that exist parallel to the longitudinal direction, resulting in clearer images and sounds.

[Brief explanation of the drawing]

FIG. 1 and FIG. 2 are schematic cross-sectional views for explaining the method of producing an ingot according to the present invention, respectively. 1, 5... Tubular heating furnace, 2, 6... Container, 3...
...Raw material, 4...Ingot, 7...Water-cooled mold.

Claims (1)

[Claims] 1. After coagulating copper or silver in one direction in the longitudinal direction,
A method for manufacturing a conductor for image display equipment and audio equipment, characterized by cold working or warm working. 2. The method for manufacturing a conductor for image display equipment and audio equipment according to claim 1, wherein copper or silver is a raw material with a purity of 99.95% or more. 3. Manufacture of a conductor for image display equipment or audio equipment according to claim 1 or 2, which is subjected to heat treatment during or after cold working or warm working in a temperature range that does not cause recrystallization. Method.