JP2002214201A - Electromagnetic wave shield flaw detector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electromagnetic wave shield flaw detector easily detecting the flaw in the welded part of the wall or the like of a building to which an electromagnetic wave shield is applied. SOLUTION: The electromagnetic wave shield flaw detector is equipped with a plurality of electrodes 4 arranged on both sides of the welded part in a pair in parallel to the welded part, current supply means 5 and 11 for allowing a current to flow across the electrodes on both sides of the welded part and a detection means for detecting the magnetic field in the welded part 2 by a magnetic flux detector 7 to detect a flaw part 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for measuring and evaluating the effect of measures against electromagnetic interference to reduce radiated interference of an electronic device at a place where the electronic device is installed.

[0002]

2. Description of the Related Art A conventional electromagnetic wave shield evaluation method is based on the fact that an electronic device in a building is actually driven after completion of a building in which electromagnetic wave shielding measures are taken as disclosed in, for example, JP-A-08-220164. The effect of electromagnetic wave shielding measures outside the building was evaluated by measurement using an antenna or the like.

[0003]

In such a conventional method, since the evaluation is performed by actually driving the electronic device in the building, the evaluation is substantially performed after the building is completed, and the failure of the shield is detected. Even in such a case, there was a problem that construction for maintenance was required again, and there were disadvantages in terms of construction period, cost, and the like.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and detects a failure of an electromagnetic wave shield on a wall of a building or the like during construction, and takes measures at that time, thereby shortening the construction period and cost. It is an object of the present invention to provide an electromagnetic shielding defect detecting apparatus which saves the above.

[0005]

SUMMARY OF THE INVENTION In view of the above-mentioned object, the present invention relates to an electrode disposed at both ends of a surface provided with an electromagnetic wave shield for detecting a shield defect on the surface to which the electromagnetic wave is shielded. And a means for detecting a magnetic field at a defective portion of the surface due to the current.

The electromagnetic wave shield defect detecting device according to claim 1, wherein a defect of a shield on a wall of a building provided with the electromagnetic wave shield is detected.

The electromagnetic wave shield defect detecting device according to claim 1, wherein a defect of a welded portion of a wall of a building provided with an electromagnetic wave shield in which a plurality of conductive plates are welded and bonded is detected. In the device.

[0008] Further, a plurality of electrodes arranged in parallel on both sides of the welded portion, current supply means for flowing a current between the paired electrodes, and a magnetic flux detector for detecting the presence of the magnetic flux in the welded portion. The electromagnetic wave shield defect detecting device according to claim 3, further comprising: a detecting unit that detects a magnetic field to detect a defective portion.

The current supply means includes a signal generator for generating a current, a conductor for connecting a current from the signal generator to each electrode, and guides disposed on both sides of the welded portion and extending along the electrodes. And a movable knob which is provided on the electrode side and which is provided with a flexible conductor plate which makes electrical contact with the movable knob and which is movable along the guide, wherein the conductive wire is connected to the movable knob. The electromagnetic wave shield defect detecting apparatus according to claim 4, characterized in that:

The electromagnetic wave shield defect detecting device according to claim 5, wherein said movable knob has a plurality of flexible conductor plates which contact different electrodes.

The current supply means includes a signal generator for generating a current, a conductor for connecting a current from the signal generator to each electrode, and guides disposed on both sides of the welding portion and extending along the electrodes. And a movable knob that has a shape and a pressing mechanism that itself is pressed against a wall to form the electrode and obtains sufficient electrical continuity with the wall, and is movable along the guide. The electromagnetic shield defect detecting apparatus according to claim 4, wherein the apparatus is connected to a movable knob.

Further, the detecting means for detecting a defective portion includes:
The support plate extending between the movable knobs on both sides of the welding portion and moving together with the movable knob, and a magnetic flux detector arranged at a portion on the support plate closest to the welding portion. An electromagnetic wave shield defect detecting device according to any one of 5 to 7.

Further, the conductive wire for connecting a current to each electrode is arranged along the support plate.
The electromagnetic wave shield defect detecting device described in the above.

The electromagnetic wave shield defect detecting apparatus according to any one of claims 5 to 9, wherein a part of the conductive wire is a stranded wire.

11. A coaxial cable for cable shielding is arranged in a part of the conductor, and a ferrite layer is provided on an outer shell of the coaxial cable. In the electromagnetic wave shield defect detection device.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below according to each embodiment. Embodiment 1 FIG. 1A and 1B show a configuration of an electromagnetic wave shield defect detecting apparatus according to Embodiment 1 of the present invention, wherein FIG. 1A is a plan view, FIG. 1B is a side view shown in perspective, and FIG. FIG. In the figure, 1 is a wall of a building, 2 is a welded portion, 3 is a gap due to a defective portion of a welded portion, 4 is an electrode, 5 is a conducting wire, 6 is a radiated magnetic field, 7 is a magnetic flux detector, and 8 is a magnetic flux detector 7
, 9 is a magnetic flux measuring device, 10 is a current, and 11 is a signal generator.

As shown in FIG. 1 (a), in this structure, a plate-like wall 1 made of a conductor having a welded portion 2 at a central portion is a component of an electromagnetic wave shielding material of a building or the like. . If a gap 3 due to a defect is present in the welded portion 2 of the electromagnetic wave shielding material, the electromagnetic wave leaks from that portion, resulting in deterioration of the shielding ability of the entire building.

In order to detect the gap 3 due to this defect, as shown in FIG. 1A, electrodes 4 are provided at both ends of the welded portion 2 so as to form a pair. Conductor 5 to 4
A high-frequency current 10 from a signal generator 11 is passed through the connector 2 to generate an electromagnetic wave in a defective portion of the welded portion 2, that is, a portion of the gap 3.

Among the electromagnetic waves from the gap 3, the radiation magnetic field
By detecting (magnetic flux) 6 with a magnetic flux detector 7 or the like, the gap 3 due to a defect in the welded portion 2 is detected. Of FIG.
(b) shows the electrode 4 viewed from the side, and (c) shows an example of the connection between the electrode 4 and the conductor 5.

Embodiment 2 FIG. 2 shows the state of the conductive wires 5a and 5b connecting the signal generator 11 and the electrode 4 in the electromagnetic wave shield defect detecting device according to the second embodiment of the present invention. As shown in the drawing, a structure is adopted in which the conductive wire 5 serving as the wiring portion is formed as a stranded wire, thereby reducing the generation of inductive noise due to the wiring portion.

Embodiment 3 FIG. 3 shows a state of the conductive wire 5 connecting the signal generator 11 and the electrode 4 in the electromagnetic wave shield defect detecting device according to the third embodiment of the present invention. As shown in the drawing, a conductor 5 as a wiring portion is covered with a coaxial tube 12 for a cable shield, and a ferrite layer 13 is provided on an outer shell thereof to reduce the generation of inductive noise.

Embodiment 4 4 to 6 show a configuration of an electromagnetic shielding defect detecting apparatus according to a fourth embodiment of the present invention. FIG. 4 is a plan view, and FIG. 5 is a transparent side view of the part A in FIG. FIG. 6 is an enlarged perspective view of a portion A in a plane direction. In each of the drawings, the same or corresponding parts as those in the above embodiment are denoted by the same reference numerals. Reference numeral 14 denotes a guide for a movable knob that moves the movable knob 16 along the direction of the row of the electrodes 4, 15 denotes an electrode support portion that supports the electrode 4 and the movable knob 16, 16 denotes a movable knob, and 17 denotes a movable knob. It is a flexible conductive plate that comes into contact with the electrode 4 that moves with it. It should be noted that the conductor 5 is provided in the second and third embodiments.
Are shown.

In this embodiment, as shown in FIG. 4, in order to connect the conductor 5 to each electrode 4 of the wall 1, a slide structure extending in parallel with both sides of the welded portion 2 is provided on both sides of the welded portion 2. A movable knob 16 provided with a flexible conductor plate 17 that is connected and electrically contacts the electrode 4 is connected to a guide 14.
To slide along. Thereby, each electrode 4
And the connection and switching of the conductor 5 are facilitated.

As shown in FIG. 7, for example, the movable knob 1
The flexible conductor plate provided in 6 may be formed as two C-shaped conductor plates 17a and 17b opened in the direction of the electrodes 4 so as to be able to contact the plurality of electrodes 4. The number of conductor plates is not limited to two, but may be three or more.

Embodiment 5 FIG. 8 to 10 show the configuration of an electromagnetic shielding defect detecting apparatus according to Embodiment 5 of the present invention. FIG. 8A is a plan view, FIG.
FIG. 10 is a perspective side view of a portion of the support plate 14a that supports the magnetic flux detector 20 of FIG. 8, and FIG.
It is an expansion perspective view of the part. In each of the drawings, the same or corresponding parts as those in the above embodiment are denoted by the same reference numerals. Numeral 20 denotes a magnetic flux detector which is semi-fixed to a metal fitting 21 with a screw structure 22 so as to be adjustable in a direction perpendicular to the surface of the wall 1 as shown in FIG.
14a supports this magnetic flux detector 20 together with the metal fitting 21,
These movable knobs 1 extend between the movable knobs 16 on both sides.
A support plate that moves with 6, and 18 is a magnetic flux detector
Are semi-fixed on the support plate 14a so that the position can be adjusted in the horizontal direction parallel to the surface of the wall 1 on the support plate 14a.

In this embodiment, as shown in FIG.
As a structure for detecting a radiated magnetic field 7 from the gap 3 due to a defect in the welded portion 2 of the wall 1, a support plate 14 a is provided between movable knobs 16 on the electrodes 4 at both ends of the wall 1.
Of these, the magnetic flux detector 20 is installed at a position closest to the welded portion 2 of the wall 1. In this structure, the magnetic flux from the gap 3 in the welded portion 2 of the wall 1 is detected by simultaneously moving the movable knobs 16 at both ends.

As shown in FIG. 10, a groove 18 is provided in a portion of the support plate 14a where the magnetic flux detector 20 is installed in the longitudinal direction of the support plate 14a, that is, in a direction parallel to the wall 1, and the magnetic flux detector 20 is provided in the groove 18. Of the magnetic flux detector 20 in a direction parallel to the wall 1 can be adjusted. Further, a screw structure 22 is provided between the magnetic flux detector 20 and the metal fitting 21 so that the position can be adjusted in a direction perpendicular to the surface of the wall 1. Thereby, the movement of the magnetic flux detector 20 is facilitated, and the position of the magnetic flux detector 20 in the vertical and parallel directions with respect to the wall 1 can be adjusted.

Embodiment 6 FIG. 11 to 13 show a configuration of an electromagnetic shielding defect detecting apparatus according to Embodiment 6 of the present invention. FIG. 11 (a) is a plan view, FIG. 11 (b) is a side view,
12 is an enlarged perspective side view of a portion C including the movable knob 16 in FIG. 11, and FIG. 13 is an enlarged plan view of a portion of the movable knob 16a in FIG. In each of the drawings, the same or corresponding parts as those in the above embodiment are denoted by the same reference numerals. As shown in FIG. 12, reference numeral 16a denotes a movable knob which itself constitutes an electrode.
A pressing mechanism including a spring 25 and a spring supporting portion 26 for pressing itself against the wall 1 in order to obtain good electrical continuity with the V-shaped groove 24 formed on the wall 1 for increasing the contact area. A formed conical or pyramidal electrode tip 23 is provided.

As shown in the figure, the movable knob 16a has an electrode as its own electrode, and the electrode tip 23 in contact with the wall 1 has a circular (pyramid) pyramid shape. In addition, a portion of the wall 1 that is in contact with the electrode tip 23 is formed with a V-shaped groove 24 extending in the same direction as the guide 14, so that the contact area with the electrode tip 23 is increased, and the wall 1 and the electrode tip 23 are separated. Is good.
Further, a spring 25 and a spring support 26 fixed to the movable knob 16a between the movable knob 16a and the support 15 press the electrode tip 23 against the wall 1 to ensure electrical conduction between the two. . In addition, a conducting wire 5 for supplying a high-frequency current flowing through the wall 1 is connected to the movable knob 16a so that conduction can be ensured. Thereby, the structure can be simplified, and detection can be performed at arbitrary intervals along the direction of the slide structure.

Embodiment 7 14 shows a configuration of an electromagnetic wave shield defect detecting apparatus according to Embodiment 7 of the present invention. FIG. 14 (a) is a plan view and FIG. 14 (b) is a side view.
In this embodiment, a conductive wire 5 for supplying a high-frequency current flowing through the wall 1 is connected to a support plate 14a that supports the magnetic flux detector 20.
It was arranged along. Thereby, the conductor 5 does not catch on the guide 14 or the like, and the conductor can be easily routed.

Further, the conductor 5 on the support plate 14a may be covered with the coaxial tube 12 for cable shield as in the third embodiment, and the ferrite layer 13 may be provided on the outer shell. Further, another part of the conductive wire 5 may be a stranded wire as in the second embodiment.

Although some embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, but includes, for example, two or more possible combinations of these embodiments. It goes without saying that it also includes

Furthermore, the present invention is not only for detecting a defect in a welded portion of a wall of a building provided with an electromagnetic wave shield, but also for detecting a defective portion in which electromagnetic waves may leak due to a scratch or a crack on the surface provided with the electromagnetic wave shield. And the same effect can be obtained.

Further, the present invention can be applied not only to detection of a defect in a welded portion of a wall of a building provided with an electromagnetic wave shield, but also to detection of leakage of an electromagnetic wave in another method such as pressure welding or riveting. Effects can be obtained.

[0035]

As described above, according to the present invention, in order to detect a defect of a shield on a surface on which an electromagnetic wave is shielded, electrodes are arranged at both ends of the surface, and a current flows between these electrodes. Means and a means for detecting a magnetic field at a defective portion of the surface due to the current, so that the defect of the shield on the surface on which the electromagnetic wave is shielded can be easily detected. can do.

Further, since the present invention is characterized in that a defect of a shield on a wall of a building provided with an electromagnetic wave shield is detected, a defect of the electromagnetic wave shield such as a building wall made of a conductor provided with an electromagnetic wave shield is detected. It can be detected relatively easily even on the way. As a result, the failure of the electromagnetic wave shield is detected during the construction, and a countermeasure is taken at that time, thereby shortening the construction period and reducing costs.

Further, since a defect of a welded portion of a building wall provided with an electromagnetic wave shield in which a plurality of conductive plates are welded and bonded to each other is detected, an electromagnetic wave shield such as a gap in the welded portion is detected. Can be easily detected.

Further, a plurality of electrodes arranged in parallel on both sides of the welded portion, current supply means for flowing a current between the paired electrodes, and a magnetic flux detector for detecting the welded portion in the welded portion. And detecting means for detecting a defective portion by detecting a magnetic field, so that a defect in a welded portion such as a building wall made of a conductor can be detected relatively easily even during the construction of the building. can do. As a result, the failure of the electromagnetic wave shield is detected during the construction, and a countermeasure is taken at that time, thereby shortening the construction period and reducing costs.

The current supply means includes a signal generator for generating a current, a conductor connecting the current from the signal generator to each electrode, and guides disposed on both sides of the welding portion and extending along the electrodes. And a movable knob which is provided on the electrode side and which is provided with a flexible conductor plate which makes electrical contact with the movable knob and which is movable along the guide, wherein the conductive wire is connected to the movable knob. Because it was characterized
Connection and switching between each electrode and the conductor are facilitated.

Further, since the movable knob has a plurality of flexible conductor plates which are in contact with different electrodes, detection can be performed by applying a current to a plurality of pairs of electrodes.

The current supply means includes a signal generator for generating a current, a conductor for connecting a current from the signal generator to each electrode, and guides disposed on both sides of the welded portion and extending along the electrodes. And a movable knob that has a shape and a pressing mechanism that itself is pressed against a wall to form the electrode and obtains sufficient electrical continuity with the wall, and is movable along the guide. Since it is characterized by being connected to the movable knob, the structure can be simplified and detection can be performed at an arbitrary interval along the direction of the guide.

Further, the detecting means for detecting a defective portion includes:
Since the support plate extends between the movable knobs on both sides of the welded portion and moves together with the movable knobs, and a magnetic flux detector arranged at a portion of the support plate closest to the welded portion, The movement of the magnetic flux detector is also facilitated.

Further, since the conductive wires for connecting the current to the respective electrodes are arranged along the support plate, the conductive wires are not caught by a guide or the like, and the wires are easily routed.

Further, since a part of the conductor is formed as a twisted wire, generation of inductive noise can be reduced.

Further, a coaxial tube for cable shield is arranged in a part of the conductor, and a ferrite layer is provided on an outer shell of the coaxial tube, so that generation of inductive noise is reduced. be able to.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of an electromagnetic wave shield defect detecting device according to a first embodiment of the present invention.

FIG. 2 is a diagram showing a configuration of a characteristic portion of an electromagnetic wave shield defect detecting device according to a second embodiment of the present invention.

FIG. 3 is a diagram showing a configuration of a characteristic portion of an electromagnetic wave shield defect detecting device according to a third embodiment of the present invention.

FIG. 4 is a diagram showing a configuration of an electromagnetic shield defect detecting apparatus according to a fourth embodiment of the present invention.

5 is a transparent side view of the wall of the portion A in FIG. 4 as viewed from above and below.

FIG. 4 is a perspective enlarged view of a portion A in a plane direction.

FIG. 7 is a diagram showing a modification of the electromagnetic wave shield defect detecting device according to the fourth embodiment of the present invention.

FIG. 8 is a diagram showing a configuration of an electromagnetic shield defect detecting apparatus according to a fifth embodiment of the present invention.

9 is a perspective front view of a portion of a support plate that supports the magnetic flux detector of FIG.

FIG. 10 is an enlarged perspective view of a portion B including the magnetic flux detector of FIG. 9;

FIG. 11 is a diagram showing a configuration of an electromagnetic shield defect detecting apparatus according to a sixth embodiment of the present invention.

FIG. 12 is an enlarged transparent side view of a portion C including the movable knob of FIG. 11;

FIG. 13 is an enlarged plan view of a movable knob portion of FIG.

FIG. 14 is a diagram showing a configuration of an electromagnetic shield defect detecting apparatus according to a seventh embodiment of the present invention.

[Explanation of symbols]

1 building wall, 2 welds, 3 gaps, 4 electrodes, 5,
5a, 5b conducting wire, 6 radiation magnetic field, 7, 20 magnetic flux detector, 8, 19 wiring, 9 magnetic flux measuring instrument, 10 current, 11
Signal generator, 12 Coaxial tube for cable shield, 13
Ferrite layer, 14 guide for movable knob, 14a support plate, 15 electrode support, 16, 16a movable knob, 1
7, 17a, 17b conductor plate, 18 grooves, 21 metal fittings,
22 screw structure, 23 electrode tip, 24 V-shaped groove, 25
Spring, 26 spring support.

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2G053 AA11 AA26 AB01 AB22 BA02 BA15 BA21 BC03 DA01 DB14 DB19 5E321 AA44 GG05 GG11

Claims (11)

[Claims] 1. An electrode disposed at both ends of a surface provided with an electromagnetic wave shield for detecting a shield defect on the surface, means for flowing a current between the electrodes, and a defective portion of the surface due to the current. And a means for detecting a magnetic field in the electromagnetic wave shielding device. 2. The electromagnetic wave shield defect detecting device according to claim 1, wherein a defect of a shield on a wall of the building to which the electromagnetic wave shield is applied is detected. 3. The electromagnetic wave shield defect detection according to claim 1, wherein a defect of a welded portion of a building wall provided with an electromagnetic wave shield in which a plurality of conductive plates are welded and bonded to each other is detected. apparatus. 4. A plurality of electrodes arranged in parallel on both sides of the welded part in a pair, current supply means for flowing a current between the paired electrodes, and a magnetic flux detector in the welded part. The electromagnetic wave shield defect detecting device according to claim 3, further comprising: detecting means for detecting a magnetic field to detect a defective portion. 5. The current supply means includes: a signal generator for generating a current; a conductor for connecting a current from the signal generator to each electrode; and guides disposed on both sides of the weld and extending along the electrodes. And a movable knob which is provided on the electrode side and which is provided with a flexible conductor plate which makes electrical contact with the movable knob and which is movable along the guide, wherein the conductive wire is connected to the movable knob. The electromagnetic wave shield defect detecting device according to claim 4, characterized in that: 6. The electromagnetic wave shield defect detecting device according to claim 5, wherein the movable knob has a plurality of flexible conductor plates that contact different electrodes. 7. The current supply means includes a signal generator for generating a current, a conductor connecting the current from the signal generator to each electrode, and guides arranged on both sides of the welded portion and extending along the electrodes. And a movable knob that has a shape and a pressing mechanism that itself is pressed against a wall to form the electrode and obtains sufficient electrical continuity with the wall, and is movable along the guide. The electromagnetic wave shield defect detecting device according to claim 4, wherein the device is connected to a movable knob. 8. A support plate extending between said movable knobs on both sides of a welded portion and moving together with said detection means for detecting a defective portion, and a magnetic flux disposed on a portion of said support plate closest to said welded portion. The electromagnetic wave shield defect detecting device according to any one of claims 5 to 7, comprising: a detector. 9. The electromagnetic wave shield defect detecting device according to claim 8, wherein the conductive wire for connecting a current to each electrode is arranged along the support plate. 10. The electromagnetic shield defect detecting apparatus according to claim 5, wherein a part of the conductive wire is a stranded wire. 11. The cable according to claim 5, wherein a coaxial tube for cable shield is arranged in a part of the conductive wire, and a ferrite layer is provided on an outer shell of the coaxial tube. Electromagnetic wave shield defect detection device.