JPS5940410A - Cable cord for audio - 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 The present invention relates to an audio cable cord and is applicable to all fields dealing with the transmission of audio frequency signals.

The conductive paths with a small number of channels (λ in total) for transmitting audio signals are usually filled with a compressible holder such as vinyl chloride or polyethylene and are held approximately parallel or concentrically. This is because it is believed that a certain level of insulation resistance is required.

It is known that in this type of cable cord, the solid holder is charged by the signal current, causing noise. was equipped with an electrically protective IJ-coating.

However, when the holder is made of polyethylene, the addition of an antistatic agent makes it difficult to form the holder into a thin solid body with no gaps between the holder and the conductor. Further, in the case of a vinyl chloride holder, there is a lot of noise due to the inherent properties of the material, so there is no point in mixing an antistatic agent.

To form an antistatic coating, increase the outer diameter of the cable cord by 1
~ It is not possible to meet the demand for miniaturization.

The present invention has been made based on the above-mentioned circumstances, and it is an object of the present invention to provide an audio cable cord that has less noise and can be made smaller if necessary.

To achieve this object, the present invention provides a cord in which a plurality of conductive paths are held by a frameable solid holder for transmitting audio frequency signals, the solid holder containing a conductive material. .

More specifically, the insulation resistance of the solid holder is about an order of magnitude larger than the internal resistance of the connected equipment, and is generally /M.
It should be around Ω.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

Figure 1 shows a so-called coaxial cable, in which the central conductor 10 is made of vinyl chloride or polyethylene insulating material.
/ and further surround the outside with a mesh conductor 12. If necessary, the outside of the conductor 12 is covered with a vinyl or rubber insulating material 13.

According to this example, a predetermined amount of carbon was mixed into an insulating material made of vinyl chloride or polyethylene.

Taking the ratio of noise current and noise voltage to a conventional cord whose resistance value per unit length is /θθMΩ, the insulation resistance is 10KΩ/rrL, / (70KΩAL, /M
The following table shows each code of Ω and 4.

The above results are obtained by comparing the noise current and direct sound voltage generated when a C chord is struck under the same conditions with a chord having the same outer diameter.

In addition, for each code from A/ to A3, vinyl chloride has a volume percentage of 7.2 to 3% and 9 to 3%, respectively.
There is C, which contains 10% and 4 to 7 carbon atoms.

As can be seen from this, the insulation resistance decreases as the amount of carbon increases, and it is generally understood that the insulation resistance should be about two orders of magnitude larger than the internal resistance of the device to be connected. For example, if the internal resistance of a typical microphone is at most Ω and the electromotive force is about 0.7V, then
I=0. /(V)//(KΩ) = 10-' (A)
Since it is a small current, the internal resistance 1 on the amplifier side
It can be seen that the insulation resistance should be about one digit larger than 0KΩ/MΩ.

FIG. 2 shows a cord in which two conductors 2 and 1 are held in parallel by an insulating material, and in this case as well, a desired amount of carbon is mixed into the insulating material π.

Figure 3 Conductor of the beam book, ? /, ,? , 2. ．． 33. J
Insulating material 3. ! ;, J.A., ,77, J.
g is assembled into one cord with an aggregate material 39, and in this case as well, a desired amount of carbon is mixed into 35 to 3 g of insulating material.

In addition, carbon may be mixed into the aggregate material J9.

By configuring the present invention as described above, it is possible to provide an audio cable cord with less noise and which can be downsized when necessary.

[Brief explanation of the drawing]

1 to 3 are configuration diagrams according to an embodiment of the present invention. lθ, /2.2/, ), :l, J/,, J2.
JJ, J'l...Conductor, //. ,20.3, ,34. ．． 77,. 3g...Insulating material. Applicant's agent Kiyoshi Inomata

Claims (1)

[Scope of Claims] 1. An audio cable cord in which a plurality of conductive paths are held by a flexible solid holder for transmitting audio frequency signals, the solid holder containing a conductive material. - 1. An audio couple cord according to claim 1, wherein the insulation resistance of the solid holder is about two orders of magnitude larger than the internal resistance of the connected device.