JPH0652722A - Electric wire with coating for electric equipment - Google Patents

Abstract

PURPOSE:To provide, at a low cost, a small-sized electric wire with a coating for electric equipment, capable of efficiently restraining radiation and transmission of electric and magnetic noise by containing a powdery or particulate magnetic material between a core wire part and an outside coating disposed around the core wire. CONSTITUTION:A core wire part 1 is constituted of an electric conductive wire 2 and an insulated coating 3 for covering the conductive wire 2. The core wire part 1 for a flat cable, constituted of a plurality of electric conductive wires spaced in parallel and an insulated coating for covering the conductive wires may be used. An outside coating 11 is disposed for covering the core wire part 1. A powdery or particulate magnetic material 21 is contained between the outside coating 11 and the core wire part 1. Electric and magnetic noise radiated and transmitted from the core wire part 1 can be effectively restrained by the magnetic material 21. Consequently, it is preferable that a sealing means for sealing a space between the core wire part 1 and the end of the outside coating is provided in a terminal part so as to prevent leakage of the contained magnetic material.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coated electric wire for electronic equipment.

[0002]

2. Description of the Related Art Conventionally, a coated electric wire has been widely used as a power supply line or an earth line in electronic equipment and as a means for connecting equipment to each other.

FIG. 4 shows a schematic structure of a conventional covered electric wire. In the figure, reference numeral 1 denotes a core wire portion, which is composed of an electric conducting wire 2 and an insulating coating 3 covering the outer circumference of the conducting wire 2. Reference numeral 5 is a tubular ferrite core. Thus, the core wire portion 1 is wound around the ferrite core 5 a predetermined number of times, so that the electrical and magnetic noise radiated from the core wire portion 1 by the ferrite core 5 or various noises transmitted through the core wire portion 1 are generated. Suppressed.

[0004]

The coated electric wire which suppresses noise by using the above ferrite core 5 has the following drawbacks.

A space for installing the ferrite core 5 is indispensable, and the electronic device accommodating the covered electric wire is likely to be upsized.

The core wire portion 1 must be wound around the ferrite core 5, which is troublesome. Particularly, when the core wire portion 1 is long, it takes much more work. In addition, it is necessary to fix the ferrite core 5 in order to improve the earthquake resistance of the electronic device, which is also troublesome. As a result, the cost tends to increase.

In order to effectively suppress noise, the core wire portion 1 must be closely attached to the ferrite core 5,
Since the core wire portion 1 has a resistance to bending, it is difficult to closely contact it. In particular, when the core wire portion 1 is thick, it is more difficult to wind the ferrite core 5 in close contact with it,
It is difficult to suppress noise effectively.

In view of the above circumstances, an object of the present invention is to provide a covered electric wire for electronic equipment, which can efficiently reduce the emission and transmission of electrical and magnetic noise while achieving downsizing and cost reduction. It is in.

[0009]

A covered electric wire for an electronic device according to a first aspect of the present invention has a core wire portion composed of an electric conductor wire and an insulating coating covering an outer periphery of the electric conductor wire, and the core wire portion. An outer coating is provided to cover the outer periphery of, and a powdery or particulate magnetic material is housed between the outer coating and the core wire portion.

According to a second aspect of the present invention, there is provided a covered electric wire for electronic equipment, further comprising: a plurality of electric conductor wires whose core portions are arranged in parallel and spaced apart from each other; and an insulating coating which covers the outer circumference of these electric conductor wires. Consists of.

The coated electric wire for an electronic device according to a third aspect of the invention is characterized in that a sealing means for sealing between the core wire portion and the outer coating end portion is additionally provided.

[0012]

According to the invention of claim 1 having the above-mentioned structure, the electrical or magnetic noise radiated from the core portion or the noise transmitted through the core portion is generated by the powder or particulate magnetic material surrounding the outer periphery of the core portion. Suppressed.

Here, since the magnetic material is contained in a powder or particle state between the core wire portion and the outer coating, it is possible to greatly save the installation space unlike the conventional ferrite core. In addition, since the magnetic substance is in the form of powder or particles, it is in close contact with the core wire portion regardless of the posture of the core wire portion. Therefore, noise can be effectively suppressed.

Further, if the above-mentioned coated electric wire is assembled to an electronic device, the wiring industry can be completed in a state where noise can be suppressed. There is no need to fix it to the device. As a result, the number of steps is significantly reduced as compared with the conventional method.

As described above, electrical and magnetic noises can be effectively suppressed while achieving miniaturization and cost reduction.

Further, according to the second aspect of the present invention, even in a flat cable, a flexible cable or the like having a core wire portion composed of a plurality of electric conducting wires or the like, magnetic powder or particles are present between the core wire portion and the outer coating. By accommodating the body, the size can be reduced, the number of assembling steps can be reduced, and the cost can be reduced. Also, electrical and magnetic noise can be effectively suppressed.

Further, in the invention of claim 3, the core wire portion and the outer coating end portion are sealed by the sealing means. Therefore, it is possible to prevent the powdery or particulate magnetic material contained between the core wire portion and the outer coating from leaking to the outside from the end portion of the outer coating even in a severe environment where vibration or the like is applied. As a result, electrical and magnetic noise can be stably suppressed.

[0018]

Embodiments of the present invention will be described with reference to the drawings. (First Embodiment) The covered electric wire according to the present embodiment is used as a power supply line for a printer, and is shown in FIG.
As shown in (B), the core wire portion 1 (electrical wire 2, insulating coating 3), the outer coating 11 which is a characteristic portion of the electric wire, and the magnetic substance 21 in powder or particle form are included. The same parts as those in FIG. 4 are designated by the same reference numerals, and detailed description thereof will be omitted.

The outer coating 11 covers the outer circumference of the core wire portion 1. In this embodiment, the outer coating 11
Is formed of a synthetic resin having flexibility and insulation similar to the core portion 1 in a tubular shape, and is formed so as to cover the entire length of the core portion 1.

Further, the magnetic body 21 is formed of a powder or particulate magnetic material capable of suppressing electrical and magnetic noise (for example, ferrite or silicon-based amorphous).
In this embodiment, the magnetic body 21 is made of particulate ferrite and is housed between the core wire portion 1 and the outer coating 11 so as to cover the entire outer circumference of the core wire portion 1.

Next, the operation will be described. Electrical or magnetic noise radiated from the core wire portion 1 or noise transmitted through the core wire portion 1 is suppressed by the particulate magnetic material 21 covering the outer circumference of the core wire portion 1.

Here, since the magnetic material 21 is housed in a particle state between the core wire portion 1 and the outer coating 11, it is possible to greatly save the installation space unlike the conventional ferrite core (5). . Further, since the magnetic body 21 is in the form of particles, it is in close contact with the core wire portion 1 regardless of the posture of the core wire portion 1. Therefore, noise can be effectively suppressed.

Further, if the covered electric wire is assembled to an electronic device, the wiring industry can be completed in a state where noise can be suppressed, and winding of the core wire portion 1 around the ferrite core (5), which has been performed conventionally, It is not necessary to fix the ferrite core (5) to the electronic device. As a result, the number of steps is significantly reduced as compared with the conventional method.

As described above, electrical and magnetic noise can be effectively suppressed while achieving miniaturization and cost reduction.

Although the core wire portion (1) has a single wire structure in the above-described embodiment, a plurality of electric conductor wires having the core wire portion (1) spaced apart in parallel such as a flat cable or a flexible cable are used. And an insulating coating covering the outer circumferences of these conductors. In such a flat cable or the like, a powdered or particulate magnetic material (21) is provided between the core wire portion (1) and the outer coating (11) so as to cover at least one outer surface of the core wire portion (11). Accommodate.

With the above structure, the size can be reduced, the number of assembling steps can be reduced, and the cost can be reduced. Also, electrical and magnetic noise can be effectively suppressed.

(Second Embodiment) The second embodiment is shown in FIG.
As shown in (A) and (B), it is characterized in that a sealing means for sealing between the core wire portion 1 and the end portion 12 of the outer coating 11 is provided. Specifically, the sealing means fits the core wire portion 1 and the outer coating terminal portion 12 and both (1,
12) is formed of a sealing tube 31 capable of sealing.

With this structure, the cored wire portion 1 and the outer coated terminal portion 12 of the covered electric wire are vibrated, for example.
The magnetic body 21 will not be exposed from between and between and will not adhere to an electric circuit (not shown) such as a PC board, thereby preventing a malfunction of the printer.

As shown in FIG. 3, the sealing means heat-shrinks the terminal portion 12 of the outer coating 11 made of a heat-shrinkable material to seal between the terminal portion 12 and the core wire portion 2. It may be configured. With such a configuration, after cutting the covered electric wire to an arbitrary length, terminal treatment of the cutting portion can be performed quickly.

Further, according to the above-mentioned first and second embodiments, the covered electric wire is used as the power source line of the printer, but it may be used as a ground line or a signal line of other electronic equipment.

[0031]

According to the first aspect of the present invention, there is provided a core wire portion composed of an electric conductor wire and an insulating coating covering the outer circumference of the electric conductor wire, and an outer coating covering the outer circumference of the core wire portion is provided. Since the powdery or particulate magnetic material is housed between the outer coating and the core portion, electrical and magnetic noise can be effectively suppressed while achieving downsizing and cost reduction.

According to the invention of claim 2, in addition,
Since the core wire part is made up of a plurality of electric conductors arranged in parallel and separated from each other and an insulating coating covering the outer periphery of these electric conductors, it is possible to use a large number of electric conductors such as flat cables and flexible cables. It is possible to effectively suppress the radiated electric and magnetic noises or the noises transmitted through the respective conductors while achieving downsizing and cost reduction.

According to the invention of claim 3, in addition,
Since the sealing means for sealing between the core wire portion and the outer coating end portion is provided, it is possible to store the powdered or particulate magnetic substance in a more stable state between the core wire portion and the outer coating. . Therefore, electrical and magnetic noise can be suppressed more effectively while achieving size reduction and cost reduction.

[Brief description of drawings]

FIG. 1 is a sectional view for explaining an embodiment of the present invention.

FIG. 2 is a sectional view for explaining a second embodiment of the present invention.

FIG. 3 is a sectional view for explaining a modification of the sealing means of the second embodiment.

FIG. 4 is a perspective view for explaining a conventional covered electric wire.

[Explanation of symbols]

 1 Core Wire Part 2 Electrical Conducting Wire 3 Insulation Coating 11 Outer Coating 12 Terminal Part 21 Magnetic Material 31 Sealing Tube (Sealing Means)

Claims (3)

[Claims] 1. A core wire portion comprising an electric conductor wire and an insulating coating covering the outer periphery of the electric conductor wire, an outer coating covering the outer periphery of the core wire portion is provided, and an outer coating is provided between the outer sheath material and the core wire portion. A coated electric wire for an electronic device, characterized in that a powdery or particulate magnetic material is housed therein. 2. The covered electric wire for an electronic device according to claim 1, wherein the core portion is composed of a plurality of electric conducting wires arranged in parallel and spaced apart from each other, and an insulating coating covering the outer circumferences of these electric conducting wires. 3. The covered electric wire for electronic equipment according to claim 1, further comprising a sealing means for sealing between the core wire portion and the outer coating end portion.