JPS5832429Y2 - Wiring duct - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a wiring duct provided with shielding measures against external electric and magnetic fields.

Conventionally, this type of wiring duct has generally been used to simplify the wiring state and protect various signal lines from the outside by housing various signal lines inside electronic devices or electrical equipment. This is what is being done.

However, if there is a high-voltage part inside an electronic device or electrical equipment, or if a large current is handled inside, the electric and magnetic fields generated by them may electrostatically or electromagnetically affect various signal lines. This has the disadvantage that noise is mixed into the signal, and in the worst case, the noise causes circuits and devices to malfunction.

FIG. 1 shows a perspective view of an example of a conventional wiring duct.

According to this, the wiring duct consists of a duct body 2 and a duct cover 1, and an opening 3 can be easily formed on the side surface of the duct body 2 to allow the signal line to enter and exit at any position as required. It is what it is.

By the way, the Conotact main body 2 and the duct cover 1 are designed with economy in mind.

Considering this, they are generally made of a material such as hard vinyl, but because of this, they have the drawbacks mentioned above, such as the need to take measures against external electric and magnetic fields.

Therefore, instead of using the wiring duct, it has been considered to shield the outer periphery of a single signal line itself or to shield the outer periphery of a plurality of bundled signal lines.

However, although the disadvantages of wiring ducts can be overcome, they are expensive, require the shield coating to be properly processed at the end and connect to an appropriate potential, and there are multiple internal wiring ducts. In the case of a shielded signal cable that accommodates signal lines, it has drawbacks such as the difficulty of shielding the signal line to be branched when branching the signal line.

The handling of signal lines in response to external electric and magnetic fields is as described above, but considering that signal levels such as control signals are moving to minute levels in the future, it is necessary to make them even less susceptible to the effects of electric and magnetic fields. Therefore, shielding at that time also needs to be done economically.

An object of the present invention is to provide a wiring duct that can economically and easily and reliably shield control signal lines and the like from external electric and magnetic fields.

For this purpose, the present invention constructs a plastic wiring duct from a duct body and a duct cover in the same manner as in the conventional case, but in this case, a wire mesh or foil shield is placed inside the duct body and the duct cover. These wire mesh or foil shield metals are embedded in a metal sand inch shape so that they can come into contact with the pressure relief valve attached to the duct body and the duct cover is installed inside the duct body or inside the duct cover. The shield drain wire, which is integrally attached in the longitudinal direction to the embedded metal mesh or foil shield metal, is characterized in that it can be connected to an external potential at the end of the duct body or duct cover.

The present invention will be explained below with reference to FIGS. 2 and 3.

First, FIG. 2 shows the left side of an example of a wiring duct according to the present invention in an exploded state.

Duct cover 1. Wire mesh or foil shield metals 4 and 5 are embedded in the inside of each duct body 2 in the form of a sandwich, and a shield drain wire 6 of an appropriate thickness is attached to the wire mesh or foil shield metal 5 in the longitudinal direction. The duct is integrally attached to the duct, and a portion thereof is extended from the two ends of the duct body.

This situation is exactly the same on the right side.

If parts of the wire mesh or foil shield metals 4 and 5 are exposed in the longitudinal direction on the contact surface of the duct cover 1vc with the duct body 2 and the contact surface of the duct body 2 with the duct cover 1, respectively, When the duct cover 1 is attached to the duct body 2, the wire mesh or foil shield metals 4 and 5 can be in electrical contact with each other, and in this state, the shield drain wire 6 is connected to an appropriate potential. Accordingly, the various signal lines housed in the internal space of the duct body 2 are not affected by external electric fields or magnetic fields.

FIG. 3 shows a perspective view of a case where a plurality of insulating coated signal lines 7 are accommodated in the internal space of the duct body 2, but this does not require any particular explanation.

Note that the opening area of the opening 3 is desirably as small as possible in consideration of the influence of the electromagnetic field; for example, the opening 3 is formed to be elongated.

By the way, in the above explanation, the shielding metal is in the form of a wire mesh or foil, and is embedded in the inside of the duct body 2 and the inside of the duct cover 1 in the shape of a sandwich. This is because it is relatively easy to use and easy to handle.

It has also been considered to form metal foil on the surface or inner surface of the duct body and duct cover.

This is done as described above for various reasons.

The shielding metal must be made of a good electrical conductor such as copper or aluminum for electrostatic shielding, and it must be a magnetic material for magnetic shielding, such as iron or Uses iron alloy.

As explained above, the present invention embeds shield metal in a sand inch shape inside the duct body and inside the duct cover, and these shield metals can be contacted when the duct cover is attached to the duct body. In addition, a portion of the shield drain wire integrally attached to the shield metal is made to protrude from the end of the duct body or one end of the duct cover.

therefore. According to the present invention, control signal lines and the like housed in the internal space of the duct can be easily and reliably shielded from external electric or magnetic fields while the shielding mechanism is simple.

[Brief explanation of the drawing]

Figure 1 is a perspective view of a conventional wiring duct,
FIG. 2 is an exploded left side view of an example of the wiring duct according to the present invention, and FIG. 3 is a perspective view of the wiring duct with signal lines accommodated therein. 1... Duct cover, 2... Duct body, 4° 5... Wire mesh or foil shield metal, 6... Shield drain wire.

Claims (1)

[Scope of utility model registration request] By attaching a duct cover to the duct body, various signal lines are housed in the internal space of the duct body, and the various signal lines can be taken in and out through openings formed as necessary on the side of the body. In a wiring duct, a gilt-copper or foil-like shield metal is embedded in the duct body and the duct cover in a sand-inch shape to protect against external electric and magnetic fields, and the metal comes into contact with each other when the duct cover is attached to the duct body. A portion of the shield metal is exposed on the contact mounting surface along the longitudinal direction, and a portion of the wire mesh-shaped or foil-shaped shield metal is exposed along the longitudinal direction of the metal in order to be connected to an external potential. A wiring duct characterized by a configuration in which a shielded drain wire is integrally attached to the base.