JPS6030007A - Shielded wire and method of producing same - 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 a shielded wire used for transmission within devices such as electronic devices and between devices.

In recent years, with the demand for high-level shielding properties in high frequency bands, shielded wires with metal foil longitudinally attached have come into widespread use. However, shielded wires with a conventional structure in which metal foil is directly attached vertically on an insulated conductor have poor flexibility, and the shield layer has extremely poor bending characteristics such as bending and rupture, and the shielding characteristics deteriorate during use. It had the disadvantage of

The present invention eliminates the drawbacks of the conventional shielded wires, and will be described in detail below with reference to the drawings. 1 and 2 are a perspective view and a sectional view showing the structure of a shielded wire obtained by the present invention. 1 is a center conductor, 2 is an insulating coating applied thereon, and constitutes an insulated conductor 3.

Now, on this insulated conductor 3, first string-like objects 4 are placed at regular intervals.
is wound. 7 is a composite film formed by integrating a metal foil 5, a plastic film 12, and a base material 6 such as paper or cloth, and 8 is a drain line arranged so as to be in contact with the metal foil surface of the composite film 7. . What is important here is that the composite film 7 and the drain wire 8 are attached vertically at the same time, and the second string-like material 9 is wound thereon at the middle of the winding pitch of the first string-like material 4. This is a point that will continue. The composite film 7 and the drain wire 8 have a continuous wavy structure in the longitudinal direction of the wire along the first string material 40 winding layer. In this case, the composite film 7 can be formed into a corrugated shape without being subjected to excessive tension. 10 is a protective coating layer covering these. Note that the above-mentioned string-like material refers to a string made of plastic monofilament, a string made of twisted fibers, or a strip obtained by cutting a plastic tape in the longitudinal direction.

In shielded wires with a conventional structure in which a composite film is vertically attached directly onto an insulated conductor, an excessive stretching force is applied to the bent part of the composite film when bent, and the shield layer easily breaks due to repeated stretching, resulting in a decrease in shielding properties. The result is On the other hand, the shielded wire obtained according to the present invention has the first and second
Because the composite film 7 is structured to wave in the longitudinal direction of the wire due to the action of the string-like material 4.9, even if a stretching force is applied to the bent portion of the composite film 7 during bending, the first and second 2
When the strings 4 and 9 become loose, the waveform formed on the composite film deforms into a slightly flat shape and absorbs the stretching force. Therefore, the composite film 7 can sufficiently withstand repeated bending without being subjected to excessive tension.

As an example, the shielded wire of the present invention, in which a polyethylene string was used to form a corrugation on a composite film of aluminum foil and polyester film, remained stable even after being repeatedly bent at 180 degrees 2,000 times. There was no breakage of the shield layer, the initial shielding properties were maintained, and the flexibility was good. As a comparative example, a shielded wire with a conventional structure in which the above composite film was directly longitudinally attached to an insulated conductor without using a string-like material was shown to have a shielding layer that was broken when the same bending as in the example was repeated 500 times, and the shielding properties were significantly deteriorated. decreased.

In addition, in the present invention, the vertical attachment of the composite film is not limited to one layer, and a plurality of drain wires may be used. Furthermore, there may be a plurality of insulated conductors, and the cable may include a large number of shielded wires of the present invention.

As explained above, the shielded wire of the present invention has remarkable bending characteristics and good flexibility compared to shielded wires of conventional structure, and is very suitable for practical use.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a shielded wire obtained according to the present invention;
FIG. 2 is a sectional view of the same. 5... Insulated conductor, 4... First string-like object, 7... Composite film, 8... Drain wire, 9... Second string-like object, 10... Protective coating layer . Applicant: Tokyo Special Electric Wire Co., Ltd. Representative ′”゛ Tsugure ``IE',',,, No. 1
Diagram 2 Display of figure procedure amendment 1 Case 1982 Patent Application No. 158986 2 Name of the invention Shielded electric wire and its manufacturing method 3 Relationship with the person making the amendment Case Patent applicant Telephone number (3) 202-2121 Name (541) d”i;: 14 WKif Co., Ltd. Representative Non-iv & 4 Date of notice of reasons for refusal Voluntary amended specification No. 5 Negative lines 1 to 5 [Note: May be used. ,” is corrected to the following lexical phrase. [In the present invention, the composite film may be provided with the metal foil surface facing inside or outside, and may have a multilayer structure. A plurality of drain wires that come into contact with the metal foil surface may be used if necessary, and may be arranged directly on the insulated conductor or on the second string-like object. In some cases, a horizontally wound layer of metal wire is formed on the second string-like object by contacting the metal foil surface of the composite film, but the end of the gold M wire can be used as it is as a drain wire. Also get hD. Moreover,

Claims (1)

[Claims] 1. An insulated conductor 3, a first string-like material 4 wound at regular intervals on the insulated conductor 3, and a first string-like material 4 wound on the outer periphery of the first string-like material 4 along the wound layer of the first string-like material 4. A composite film 7 formed by integrating a metal foil 5 and a base material 6 arranged in a wavy manner, a drain line 8 in contact with the metal foil surface of the composite film, and a composite film 7 formed in a wavy manner. A shielded wire characterized by comprising a second string-like material 9 wound on the valley and a protective coating layer 10 covering the second string-like material 9. 2. Place the first strings 4 on the insulated conductor 5 at regular intervals, -1
After winding, a composite film 7 formed by integrating the metal foil 5 and the base material 6 and a drain wire 8 in contact with the metal foil surface of the composite film are vertically attached on the outer periphery of the composite film, and the composite film 7 is placed on the outside of the composite film 7. A shielded electric wire characterized in that a second string-like material 9 is wound so that the film 7 waves along the first string-like material 40-wound layer, and a protective coating layer 10 is further provided on these. manufacturing method.