JPH03241615A - Insulation type semi-rigid coaxial cable - Google Patents

Abstract

PURPOSE:To satisfy electrostatic characteristics by installing an insulation type protection flexible bush, which is bent along the outside of the bending angle of a semi-rigid coaxial capable formed bent, and covering both the bush and the cable with a spiral tube. CONSTITUTION:At the outside of the bending angle of a semi-rigid coaxial cable 1 formed by bending, an insulation type protection flexible bush 2 bent in the same way as this cable 1 is arranged, while this cable 1 and this flexible bush 2 are covered with a spiral tube 3. It is thereby possible to protect the insulation of the cable 1 in such a simple constitution that the electrostatic discharge characteristics thereof can be fully satisfied.

Description

[Detailed Description of the Invention] [Summary] The purpose of this invention is to provide insulation protection means that can sufficiently withstand ESD (electrostatic discharge) characteristics using a simple method regarding insulated semi-rigid coaxial cables, which are connected between units and used for signal transmission. In the semi-rigid coaxial cable that is to be bent, an insulated protective bushing that is bent in the same way as the semi-rigid coaxial cable is installed along the outside of the bending angle of the semi-rigid coaxial cable, and the semi-rigid coaxial cable is The insulated protective fish is covered with a spiral tube.

[Industrial application field]

The present invention relates to an insulated semi-rigid coaxial cable.

In recent years, the EMI (electromagnetic interference) and ESD resistance of wireless devices, etc.
The importance of (electrostatic discharge) characteristics is being recognized. In particular, regarding ESD resistance, if the installation location of the device is covered with carpet or the like, the operator may be charged with static electricity, and if the operator touches the device, the static electricity will be discharged all at once, causing an abnormality in the device.

Therefore, in normal cases, the operator is required to wear a wristband 8 connected to the ground contact 7, as shown in FIG. However, since the possibility of the operator touching the device before attaching the wristband 8 cannot be denied, it is essential to provide complete insulation or grounding to prevent any abnormalities from occurring even if the operator touches the device. There is.

[Prior art]

In order to prevent abnormalities caused by the sudden discharge of static electricity as described above, in the past, the entire device was covered with a grounded door in order to completely ground the entire device, and the operator who charged the device The idea was to eliminate touching. However, although this method is very good in terms of characteristics, it requires a large-scale measure and is not practical. Furthermore, even if it were put into practical use, it would have poor operability, such as having to open the door every time it was operated.

Considering the operability and ESD (electrostatic discharge) resistance of the device, it is effective to take measures for the weakest part of the device.

Particularly in the case of the wireless device 8, as shown in Figure 6, since the front of the device is often connected between units using a semi-rigid coaxial cable 1, there is a possibility that the operator of the device may accidentally touch it. is the high part. In addition, this semi-rigid I coaxial cable 1 is used to pass the main signal, and its structure is such that the core wire and the outer sheath are insulated with Teflon, and the outer sheath is made of copper pipe. The structure is such that it is connected to ground via a connector. When a discharge test of, for example, 7 KV or 15 KV is performed on the copper pipe that is the outer sheath of the semi-rigid coaxial cable 1, a current is generated very close to the main signal, and an induced current is generated in the inner conductor, causing an error in the device. Therefore, if the operator carelessly touches the semi-rigid coaxial cable and releases static electricity all at once as described above, there is a high possibility that an error similar to the above will occur. Therefore, in order to avoid the above-mentioned errors by a simple method, it is possible to prevent characteristic deterioration by insulating the semi-rigid coaxial cable 1. As an insulation method, as shown in Figure 4, a heat shrink tube 5 is connected to a semi-rigid coaxial cable 1.
After covering the semi-rigid coaxial cable 1 and connector 4
solder and apply heat to the heat shrink tube 5 to compress it, or after soldering the semi-rigid I coaxial cable 1 and the connector 4, cover the semi-rigid coaxial cable 1 with a large diameter heat shrink tube 5 and apply heat to compress it. The method is being used. Furthermore, as a simple method of insulating the semi-rigid coaxial cable 1, a method of insulating and protecting the cable by wrapping a spiral tube 3 around the semi-rigid coaxial cable 1 as shown in FIG. 5 has been considered.

[Problem to be solved by the invention]

In the conventional insulation protection method for semi-rigid coaxial cables as described above, when heat-shrinkable tubes are used,
Since the semi-rigid coaxial cable and the connector are connected by soldering, a shorter heat-shrinkable tube must be used for the semi-rigid coaxial cable to prevent problems such as the heat-shrinkable tube melting due to the heat of soldering. It was not possible to perfectly insulate semi-rigid coaxial cables. In addition, when using large-diameter heat-shrinkable tube, heat-shrink the tube after connecting the semi-rigid coaxial cable and connector with solder.

- It is possible to use heat shrink tubing with a length that matches the length of the semi-rigid coaxial cable in order to fit the tube into the semi-rigid coaxial cable, but even if heat is applied, the shrinkage will not be sufficient, resulting in unstable insulation. The problem is that it becomes. Furthermore, since the work of covering the semi-rigid coaxial cable with heat-shrinkable tube is done before bending the semi-rigid coaxial cable, the bending process can cause cracks, wrinkles, and cracks in the heat-shrinkable tube, leading to deterioration of the insulation properties. .

Alternatively, as shown in Figure 5, a simple insulation method such as bending the semi-rigid coaxial cable and then covering it with a spiral tube may be considered, but the gap between the spirals (particularly the one formed outside the bent part) There was a problem in that the insulation properties were not very good because it was thought that discharge could occur through the large gaps between the spirals.

Therefore, in the present invention, sufficient ES can be achieved using a simple method.
The purpose is to provide insulation protection measures that can withstand D (electrostatic discharge) characteristics.

On the inside of the bending angle of the semi-rigid coaxial cable, where there is a low possibility of damage, the space between the spirals is extremely narrow, and there is no problem in terms of insulation.

[Means to solve problems]

As shown in FIGS. 1 and 2, an insulated protective bushing 2 which is bent in the same manner as the semi-rigid coaxial cable 1 is placed on the outside of the bending angle of the semi-rigid coaxial cable 1. This problem is solved by covering the semi-rigid coaxial cable 1 and the insulated protective fish 2 with the spiral tube 3.

[Effect]

With the above means, in the present invention, it is possible to completely insulate the outside of the bending angle of the semi-rigid coaxial cable, which is likely to be accidentally touched by an operator, by using the insulated protective bushing and the spiral tube.
[Embodiment] An embodiment of the present invention is shown in FIGS. 1 to 3, which the operator comes into contact with.

In the figure, the connector portion 4 is first soldered to the semi-rigid coaxial cable 1, and then the semi-rigid coaxial cable 1 is bent (all bent in the same direction). Next, along the outside of the bending angle of the semi-rigid coaxial cable 1, an insulated protective bushing 2 having a large number of uneven protrusions formed along the longitudinal direction on both sides of a band-shaped plate material is arranged. The multiple convex projections of the protectable bushing 2 are bent in the direction of the semi-rigid coaxial cable 1 to determine the installation position. The protective bushing 2 whose installation position has been determined as described above and the semi-rigid coaxial cable 1 are wound around the spiral tube 3. (See FIG. 2) FIG. 3 shows a cross-sectional view of the semi-rigid coaxial cable 1 which has been provided with insulation protection in one or more ways.

Here, an insulated protective bushing 2 is placed on the outside of the bending angle of the semi-rigid coaxial cable, and a spiral tube 3 is wound around the bending angle of the semi-rigid coaxial cable 1 so that the semi-rigid coaxial cable is The distance to the outer sheath (steel pipe) of the cable 1 is increased, and the insulation effect is increased.In another embodiment, after bending the semi-rigid coaxial cable 1 in the same manner as described above, liquid is applied to the semi-rigid coaxial cable 1. Another possible method (not shown) is to complete the insulation by attaching and hardening rubber. In this method, by coating the semi-rigid coaxial cable with rubber after bending, it is possible to avoid problems caused by bending, such as cracks, which could not be avoided when using conventional heat-shrinkable tubes.

〔Effect of the invention〕

As described above, according to the present invention, it is possible to perform insulation protection of a semi-rigid coaxial cable with a simple configuration, and it is possible to sufficiently satisfy ESD (electrostatic discharge) characteristics.

[Brief explanation of drawings]

Figure 1 is an exploded perspective view of the present invention Figure 2 is a side view of the present invention Figure 3 is a sectional view of the present invention Figure 4 is a side view of a conventional insulation structure using a heat shrink tube Figure 5 is a conventional Figure 6 is a side view of an insulating structure using a spiral tube.In the overall configuration diagram of the device, 1...Semi-rigid coaxial cable 2...Insulated protective bushing 3...Spiral tube 4...・Connection 5...Heat shrink tube 6...Wristband 7...Earth contact 8...Wireless device

Claims (1)

[Claims] In a semi-rigid coaxial cable that is connected between units and transmits signals, the semi-rigid coaxial cable (1) is bent and formed.
An insulated protective bushing (2) bent in the same way as the semi-rigid coaxial cable (1) is installed along the outside of the bending angle of the semi-rigid coaxial cable (1).
An insulated semi-rigid coaxial cable characterized in that 1) and the insulated protective bushing (2) are covered by a spiral tube (3).