JPS6297274A - Electric connector - 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 electrical connectors.

[Prior Art] Connectors are always used when connecting electronic devices using electric wires or cables, and their types and structures vary widely depending on the purpose.

Among these, in audio and video equipment, sound quality,
In order to prevent deterioration of image quality, special consideration is required for electric wires and cables, and the inventors have already devised a linear crystal conductor (Hitachi Cable ■ trade name LC-OFC) that has a linear crystal structure, and today it is a high-grade conductor. It plays an important role as an essential conductor in audio, video, and recording systems.

On the other hand, taking audio and video connectors as an example, when connecting systems, so-called pin connectors are used at both ends of electric wires and cables.

When deterioration of high-quality audio and video signals is a problem, it is said that the material of the (+) and (-) contact pieces has the greatest impact, and to date, worldwide, in addition to brass materials, two
4-karat gold metal has been considered to be the best.

[The problem that the invention aims to solve]However, this is a common theory and is not based on any scientific basis.

As a result of a series of research into audio and video cables, the inventors realized that the higher the purity of the copper wire, the better the sound and picture quality, and concluded that brass materials are not necessarily good. I thought about changing it to oxygen-free copper.

However, copper generally has poor rigidity and cannot be used for connector connecting pieces that require elasticity due to its longevity.

The present invention has been made based on the above, and an object of the present invention is to provide an electrical connector which has excellent transmission characteristics for audio and video signals, and which has a long lifespan.

[Means for Solving the Problems] In the electrical connector of the present invention, both the (+) electrode and the (-) electrode are made of oxygen-free copper with an oxygen content of 50 ρpI11 or less in an inert gas atmosphere at 800°C or higher. It is characterized in that it is made of a linear crystal conductor made by holding the crystal grains in a large size and then linearizing the crystal grains.

When oxygen-free copper is held in an inert gas atmosphere such as nitrogen gas or argon gas at a high temperature of 600 to 1000°C for 30 minutes or more, crystal grains gradually grow, usually 0.02 to 0.03
Crystal grains of about m+n grow into giant crystals of 0.4 to 0.8 mm or even larger in some cases. Subsequently, when this is stretched by a method such as wire drawing or rolling, the giant crystal is oriented in the length direction and linearized in proportion to the amount of stretching, and a linear crystal conductor is obtained.

In such a linear crystal conductor, the grain boundary density in the longitudinal direction is extremely diluted, and the dielectric effect of the grain boundaries is significantly reduced, thereby achieving excellent transmission characteristics.

In addition, since the linear crystal conductor obtained by stretching or rolling giant crystals remains work-hardened, it has better rigidity than ordinary hard copper, making it possible to create connectors with a long lifespan. .

Note that the copper used in the present invention has an oxygen content of 50
The reason for this is that the dielectric effect of grain boundaries can be reduced by not containing suboxide steel, and secondly, if cuprous oxide or copper sulfide is included, This is because these become crystal nuclei and the growth of the crystal stops midway, resulting in an embrittlement state.

[Example] FIG. 1 is an explanatory diagram of an example of the present invention, where l is (+
) electrode, 2 is a (-) electrode, 3 is an insulator, and 4 is a housing.

(+) Electrode 1 is made by annealing a copper wire with an outer diameter of 20 mm made of oxygen-free copper with an oxygen content of 5 ppn+ by keeping it in nitrogen gas at 950°C for 1 hour to grow it into a giant crystal. Then draw this into a round bar with an outer diameter of 3 mmφ,
This was plated with gold to a thickness of 0.7 μm.

(-) Electrode 2 is made by dipping a 3 mm thick copper plate made of oxygen-free copper with an oxygen content of 5 ppn+ into nitrogen gas at 950°C.
By holding and annealing it for a long time, it grows into a giant crystal, which is then rolled into a copper plate with a thickness of 0.4 mm, which is formed into a ring shape by press working, and then gold plated with a thickness of 0.7 μm. It was formed using the applied material.

The pin connectors manufactured as described above and the pin connectors manufactured using conventional brass gold plating materials were tested using a tertiary strain meter CLT-1 (RE Instrument
FIG. 2 shows the results of measurements of the generation of third-order strain voltage using the TS A, S, /Denmark). In FIG. 2, A is the data for the pin connector of the present invention, and B is the data for the conventional pin connector, but it can be seen that the connector of the present invention is approximately one order of magnitude lower than the conventional one. Recognize.

In addition, when a connecting cable made of a linear crystal conductor was attached to the pin connector of the present invention, and the preamplifier and power amplifier were connected, as well as the CD player and the preamplifier, the sound quality was compared with that when a conventional connector was used. Such changes were recognized.

(1) The sound pressure level has increased.

(2) The dynamic range has been expanded.

(3) The spread and depth of the sound field has increased.

(4) Improved transparency.

It should be noted that although the above embodiments relate to plugs, it goes without saying that the present invention can also be applied to jacks.

[Effects of the Invention] As explained above, according to the present invention, it is possible to improve the transmission characteristics of audio and video signals, and it is possible to realize an electrical connector that has no problems in terms of service life.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of an embodiment of the electrical connector of the present invention, and FIG. 2 is a graph of measurement results of tertiary strain voltage. 1: (+) electrode 2: (-) electrode 3: Insulator agent Patent attorney Fujio Sato i 1 1D O 2 Oral input! +1:m

Claims (1)

[Claims] (1) In an electrical connector in which a (-) electrode is provided on the outer periphery of a (+) electrode via an insulator, both the (+) electrode and the (-) electrode have an oxygen content of 50 ppm.
An electric device characterized in that the following oxygen-free copper is kept in an inert gas atmosphere at 600°C or higher to make the crystal grains huge, and then the crystal grains are made into linear crystal conductors. connector.