JPS63237312A - Wire for acoustic/image apparatus - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to electric wires used for wiring audio equipment and video equipment, for example, electric wires used for wiring stereos, VTRs, etc. .

[Prior Art 1] Single or stranded copper wires have conventionally been used as electric wires for wiring stereos, VTRs, and the like. This copper wire single wire or 1! An organic insulating coating is applied to the wire.

[Problems to be solved by the invention] In recent years, as the performance of audio equipment and imaging equipment has improved, the quality of the sound and images obtained with these equipment has become dependent on the quality of the electric wires used for wiring inside and outside the equipment. It is becoming more and more common. Conventionally, as described above, copper wire coated only with an organic insulation coating has been used for wiring audio/image equipment such as stereos and VTRs. The problem with wiring using organic material-coated copper wires is that even if higher-performance audio/image equipment is used, the sound and image quality obtained will be affected by the transmission of audio/image signals through the wiring, and will not improve much. there were.

An object of the present invention is to provide an electric wire for audio/image equipment that exhibits better transmission of audio/image signals than electric wires coated only with an organic insulation coating.

[Means for Solving the Problems] The electric wire for audio/image equipment according to the present invention has a coating made of oxide ceramics formed by reacting an alkoxide with a sol-gel method on the surface of the conductor. It is.

[Operations and Effects of the Invention] High frequency current that transmits audio/image signals flows near the surface layer of the conductor due to the skin effect. Therefore, the transmission of audio/image signals is considered to be extremely susceptible to the effects of the material covering the conductor surface.

Accordingly, the inventors have found through experiments that the higher the hardness of the material in contact with the conductor surface, the better the transmission of audio and image signals, and the better the resulting sound and image quality. This invention is based on the knowledge of the inventors of the present application.

Organic films traditionally used as insulators,
By increasing the temperature at which the organic substance is baked onto the conductor, the hardness of the coating can be increased. However, when a film made of oxide ceramics is formed on the conductor surface,
A very hard coating can be obtained compared to organic coatings. Therefore, a coating made of oxide ceramics is formed on the surface of the conductor. At this time, in order to obtain an insulating effect, the oxide ceramic film may be coated with an insulating material such as an organic material. Alternatively, an oxide ceramic film having a specific resistance of 1×10′ Ωcm or more may be formed. When this oxide ceramic coated 'R' wire is used for the wiring of audio/visual equipment, it provides superior acoustic and
It shows the transferability of image signals and provides 1q of good sound quality and images. Furthermore, since this saponified ceramic has heat resistance, it is suitable for members such as voice coils for high-output speakers. In this invention, the conductor only needs to have high conductivity, and Ctl and /l are preferable. Furthermore, if the purity is 99.9% or more, it exhibits better transmission of audio/image signals. In addition, the oxide ceramic that forms the coating has a Vickers hardness of 100 kg/rA.
It is sufficient if it exceeds Il12. and Eva, 8102,
Oxide ceramics such as Ti 02 and A11z Os are preferred.

The method of forming the oxide ceramic film in the electric wire for audio/image equipment according to the present invention is a method called a sol-gel method. Specifically, first, alkoxides of elements contained in the target oxide ceramic are Water and an acid as a catalyst are added to an alcoholic solution in which hydrogen is dissolved, causing a hydrolysis and dehydration condensation reaction, and the solution is applied to the conductor surface.

Thereafter, an oxide ceramic film is formed by heating and firing at several hundred degrees. At this time, the heating and baking step may be performed under reduced pressure. In this case, the heating humidity can be lowered. Furthermore, instead of applying a solution, the oxide ceramic film may be formed by immersing the conductor in the solution.

In addition, methods for forming an oxide ceramic film on the surface of a conductor include, in addition to the sol-gel method, gas phase 'aF!
Although there are growth methods, the sol-gel method has an advantage over the vapor phase thin film growth method in that it can produce oxide ceramic films that have strong adhesion to conductors such as copper. Furthermore, since the oxide ceramic film formed by the sol-gel method has flexibility, it will not peel off even if the wire is used in a bent state. Compared to the vapor phase thin film growth method, the sol-gel method does not require special equipment such as a plasma generator or a heating device for film materials, and is a low-temperature film formation method that can be used industrially. It is easy to use, and it is low cost both in terms of materials and equipment.

If the formed ff1J thickness is less than 0.1 μm, there is almost no effect of increasing the hardness near the conductor surface. On the other hand, 30
If the film thickness exceeds .mu.m, the above effects will be saturated, and it will take a long time to form the film.

Therefore, the oxide ceramic film has a film fg of 0.1 μm.
A thickness of at least 30 μm is desirable.

Further, the oxide ceramics constituting the conductor and the surface layer portion are not limited to those composed of a single layer or a tortoise-like material, respectively. For example, between a conductor and a surface layer! ! An intermediate layer of another conductor or oxide ceramic may be formed to improve the rM properties. Hardness near the conductor surface,
In other words, it is sufficient that the apparent hardness, which is the hardness of the oxide ceramic plus the hardness of the intermediate layer, becomes high. A plurality of ceramic films may be stacked and formed.

The conductor used in the present invention is, for example, a single wire on which an oxide ceramic film is formed. However, the conductor may be made by gathering a plurality of conductor strands into a twisted wire, and an oxide ceramic film may be formed on the surface of each conductor strand.

[Example] As shown below, an electric wire having an oxide ceramic film according to the present invention formed on the conductor surface (inventive example) and a conventional electric wire having only an organic coating (comparative example) were produced.

In addition, oxide ceramics (8102, Δ standing).

The following mixed solutions were used as coating solutions containing alkoxides for forming films consisting of Os 2 , Ti 2 O□).

Coating solution 1 (SIOI/tetra n-butyl orthosilicate ((n -C4Hs
Butanol (n) containing 961101
C=8908) solution and a butanol solution containing 150a+mol of water and 1.0mmol of nitric acid were mixed with stirring and refluxed for 2 hours.

Coding solution 2 <Al10. film.

Aluminum isopropoxide ((i -C,H2O)
, △之) containing 5Qmmol of inpropyl alcohol (
icalgo, 0l-1) solution and an isopropyl alcohol solution containing 50ml of water and 1,011111101 of nitric acid were stirred and mixed, and the mixture was refluxed for 2 hours.

Coating solution 3 (TI O?Makigata I titanium isopropoxide ((i C= Ht O) 4 to 1)
Isopropyl alcohol containing 0 mmol (i-C.
I-I, OH) solution and an isopropyl alcohol solution containing 50 mmol cf5 of water and 1,01111101 nitric acid were stirred and mixed, and the mixture was refluxed for 2 hours.

"t (11 rows made of 99.99% pure copper, diameter 3.
Coating solution 1 for lφ copper wire maintained at a temperature of 50°C
and pulled up at a rate of 10 CII/1n.

The copper wire is then dried by heating it in the air for 10 minutes at a temperature of 150°C, and then dried at a temperature of 500°C.
After baking for 10 hours, a film thickness of 18μ was formed on the surface of the copper wire.
8102 film of m is formed.

An electric wire 2 (copper wire with a diameter of 3.0 mi, made of copper with a purity of 99.99%) was immersed in the coating solution 2 maintained at a temperature of 50° C., and pulled up at a speed of 10 cm/min.

The copper wire is then dried by heating it in the air for 10 minutes at a temperature of 150°C, and then dried at a temperature of 500°C.
After baking for 10 hours, a film thickness of 18μ was formed on the surface of the copper wire.
Formed with a 20a film.

Electron 13 (Invention 1J made of copper with a thickness of 99.99%, diameter 3.0 m city φ
A copper wire was immersed in coating solution 3 maintained at a temperature of 50° C. and pulled up at a speed of IOCIII/fllin.

The copper wire was then dried by heating it in the air for 10 minutes at a temperature of 150°C, and an additional 1fl! 50
After heating and baking at 0℃ for 10 hours, F was added to the surface of the r14 wire.
TlO211Q with a thickness of 18 μm is formed.

Electric wire 4 (made of 99.99% pure copper, diameter 0.25+111
A copper wire of φ was immersed in coating solution 1 maintained at a temperature of 50° C. and pulled up at a speed of 10 cm+/win. After that, this ti4 was placed in the air at a temperature of 150°C for 10 minutes.
1! Dry by heating the fl, and further at a temperature of 5
After heating and baking at 00℃ for 10 hours, a film thickness of 18μ was formed on the surface.
144 copper wires with the same S+ O2 film were twisted together. thing.

Electric wire 5 (according to the present invention, made of 99.99% pure aluminum, diameter 3.0
IIIJ aluminum wire of sv+φ! It was immersed in coating solution 1 maintained at 50°C and pulled up at a speed of iocm/+mtn. Thereafter, the aluminum wire was dried by heating it in the air at a temperature of 150°C for 10 minutes, and then fired at a temperature of 500°C for 10 hours to coat the surface of the aluminum wire with a 3i0z film with a thickness of 18 μm.
The one that formed lB3.

6 (Invention example made of pure 111t99.99% copper, diameter 3.Onm
A copper wire plated with nickel to a thickness of 3 μm was immersed in coating solution 1 maintained at a temperature of 50°C.
It was pulled up at a speed of Il/1ain. Then temperature 15
The nickel-plated copper wire was dried by heating it in the air at 0°C for 10 minutes, and then heated to a temperature of 500°C.
5i0211sI with a thickness of 18 μm was formed on the surface of the nickel-plated copper wire by heating and baking for 10 hours.

However, in the electric wires 1.2, 3.4.5.6, the following pretreatment was performed before each conductor was immersed in the coating solution.

Each conductor is 1. It was degreased by immersion in ON sodium hydroxide solution and then washed with deionized water. Furthermore, 2. A pickling treatment was performed using an aqueous nitric acid solution of ON. The sliding door was washed with deionized water.

Wire 7 (comparison) Diameter is 3. An oxygen-free copper wire of Oaa+φ is immersed in a solution containing polyvinyl formal and an organic solvent, and after being taken out, the temperature is 32
A polyvinyl formal film with a thickness of 18 μm is formed on the surface by passing it through a heating furnace maintained at 0°C.

Electric wire 8 (an oxygen-free conductor wire with a comparative diameter of 3,011 + 1φ) is immersed in a solution containing polyvinyl formal and an organic solvent, and taken out W! By passing it through a heating furnace maintained at a hot water temperature of 10°C, a film of F1718 μm is coated on its surface. Made of polyvinyl formal film.

1! Eight types of electric wires 1 to 8 were used as wiring materials for stereo video, and the sound quality was comparatively evaluated.

The sound quality was evaluated by 100 listeners, and the number of people who answered that the following four items were all excellent was evaluated.

(1) Sound balance (2) Transparency (3) Clarity (4) Richness The evaluation results are as follows.

Evaluation (person) Electric wire 1 (Example of the present invention) 93 2 (Example of the present invention) 94 3 (Example of the present invention) 95 4 (Example of the present invention) 92 5 (Example of the present invention) 94 6 (Example of the present invention) 93 7 (Comparison) Example) Three 8 (Comparative example) 36 As is clear from the above results, 8102 film, Al1
20. Electric wire with Maki, Ti Q, film formed on the conductor surface 1.
It was found that the sound quality of Wire 2.3.4.5.6 was superior to that of Wire 7.8, which had a polyvinyl formal film formed thereon.

(2 idiots)

Claims (8)

[Claims] (1) An electric wire for audio/image equipment having, on the surface of a conductor, a coating made of oxide ceramics formed by reacting an alkoxide with a sol-gel method. (2) The electric wire for audio/image equipment according to claim 1, wherein the conductor is Cu or Al. (3) The conductor is Cu or A with a purity of 99.9% or more
1. The electric wire for audio/image equipment according to claim 1, which is 1. (4) The oxide ceramic is SiO_2, TiO
The electric wire for audio/image equipment according to any one of claims 1 to 3, which is an oxide ceramic containing at least one compound selected from the group consisting of Al_2O_3 and Al_2O_3. (5) The Vickers hardness of the oxide ceramic is 1
00 kg/mm^2 or more, the electric wire for audio/image equipment according to any one of claims 1 to 4. (6) The electric wire for audio/image equipment according to any one of claims 1 to 5, wherein the coating has a thickness of 0.1 μm or more and less than 30 μm. (7) The conductor is a twisted wire made by collecting a plurality of conductor wires, and the oxide ceramic coating is formed on the surface of each conductor wire.
The electric wire for audio/image equipment according to any one of Items 1 to 6. (8) The acoustic film according to any one of claims 1 to 7, comprising an organic coating on the film.
Electric wires for imaging equipment.