JPS60116215A - Wire for noise filter - Google Patents

Abstract

PURPOSE:To obtain a wire for noise filter by applying a conductive coating onto a thin insulation film formed on the surface of a good conductor and covering it with an insulation coating so as to utilize a distributed capacitance comprising the conductor coating. CONSTITUTION:The thin insulating coating 7 being a dielectric is formed on the surface of the good conductor 6 such as a copper wire or an aluminum wire, a conductive film 9 such as copper or aluminum or a magnetic conductive film 8 such as iron is provided to the surface of the film 7 by a chemical plating or vapor-deposition, and an insulation film 9 is formed on the surface of the film 8 so as to form a wire 10 constituting a distributed capacitance between the good conductor 6 and the conductive film 8. Terminating processing such as soldering is attained easily by exposing the terminal of the wire 10 while the wire 6 and the film 8 are shifted. In grounding the film 8 and connecting the wire 6 in series with a power supply circuit, noise superimposed on the power supply circuit is suppressed.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a noise filtering material connected to a power supply circuit or a smoothing circuit and used for suppressing noise and pulsation components.

Noise filters are used to prevent equipment from malfunctioning due to noise superimposed on the power supply, and to prevent noise generated by the equipment from being emitted to other equipment or the power supply side. and so on.

For any purpose of noise filling, as shown in Figure 1, a circuit in which an inductance 0 is inserted in series with the power supply and a capacitor (0) is connected in parallel is widely used as a noise filler. It is used.

As shown in Figure 2(a), the inductance 0 used in such a noise filter circuit is 1 (a magnetic core such as a toroidal ferrite core or a dust core (1)) and a VC coil (2). ) k!, or a bead-shaped magnetic core (4) with a through hole (3) as shown in Figure 2 (b) with a conducting wire (5) inserted through the hole. ing.

In order to manufacture the intance used in such noise filter circuits, it is necessary to go through the molding/sintering process of the magnetic core material and the winding process.
There was a problem in that processing costs increased because C) had to be connected.

Therefore, this invention was devised to solve these problems and obtain an inexpensive wire material with a noise filtering effect. By providing a conductive coating through an insulating coating, we create a wire that actively forms a distributed capacitance for the conductive wire.
This wire can be used to wire a power supply circuit, or the wire can be wrapped around a coil to increase inductance.
It is configured to suppress noise superimposed on the p-power circuit by inserting it in series into the power-supply circuit.

As shown in Figure 3, a first thin insulating coating (7) serving as a dielectric is completely formed on the surface of a conductive wire (6) such as a copper wire or an aluminum wire, and this thin insulating coating (7) A conductive coating (8) such as copper or aluminum or magnetic conductive coating (8) such as iron is provided on the surface by electroless plating or vapor deposition, and
A second insulating coating (9) is formed on the surface of this conductive coating (8), and a wire (10) is formed in which distributed capacitance is actively formed between the good conductive wire (6) and the conductive coating (8). Then, the terminal of this wire (1[) is a good conductive wire (
6) and the conductive coating (8) are exposed in a shifted state so that connection processing such as soldering can be easily performed.

By winding this wire 00 into a coil, the inductance increases, and capacitance is formed in a distributed constant manner through the first thin dielectric insulation coating (7). Additionally, the outermost layer of the wire αO) is provided with a second insulation coating (9).
Therefore, when the wire α0 is wound into a coil, short circuits between the conductive coatings (8) will not occur between adjacent coils.

Therefore, the conductive coating (8) is grounded, and the conductive wire (6)
By connecting in series to the power supply circuit, it is possible to suppress the noise superimposed on the power supply circuit.

Furthermore, when the wire 00 wound into a coil shape is interlinked with the magnetic core 0 which forms a closed magnetic path as shown in FIG. 4, the inductance is further increased and the noise suppression effect is further improved. Can be done.

If a magnetic conductive coating such as iron is used as the conductive coating (8) of the wire q0, the inductance will further increase.
In addition to being used as a noise filter by winding it into a coil, the wire αQ itself can be used to wire a power supply circuit to function as a noise filter.

As explained above, the wire α of the present invention is used to obtain a simple noise filter that requires many concomitant parts such as capacitors, and moreover,
It is industrially useful because it is easy to mass produce.

[Brief explanation of the drawing]

Fig. 1 is a circuit diagram of a conventionally known noise filter circuit, Fig. 2 is a perspective view of an inductance element used in the circuit of Fig. 1, and Fig. 3 is a circuit diagram of a noise filter circuit of the present invention. FIG. 4, a perspective view of the manufacturing process of the wire rod, shows a noise filter manufactured using the noise filter wire rod of the present invention.
It is a perspective view of a filter. 6... Good conductive wire 7... First thin insulation coating 8... Conductive coating 9... Second insulation coating

Claims (3)

[Claims] (1) A good conductive wire, a first thin dielectric insulation coating formed on the surface of the good conduction wire, a conductive coating formed on the surface of the first insulation coating, and a surface of the conductive coating and a second insulating coating formed on the conductive coating, wherein the conductive wire has a positively distributed capacitance due to the presence of the conductive coating. (2) A wire for a noise filter according to claim 1, which has a magnetic conductive coating such as iron as a conductive coating to improve the inductance of the good conductive wire. (3) Claim 1 or 2 in which the conductive wire and the conductive coating are exposed in a shifted state at the terminal.
Noise filter wire material described in item No.