JP3711328B2 - Electromagnetic wave shield defect detection device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a device for measuring and evaluating the effect of countermeasures against electromagnetic interference that reduce radiation interference of an electronic device performed at an installation location of the electronic device.
[0002]
[Prior art]
The conventional electromagnetic wave shielding evaluation method is, for example, an electromagnetic wave outside the building by actually driving an electronic device in the building after completion of the building with the electromagnetic wave shielding measure as disclosed in Japanese Patent Application Laid-Open No. 08-220164. The effect of shielding measures was evaluated by measurement with an antenna or the like.
[0003]
[Problems to be solved by the invention]
In such a conventional method, the evaluation is performed by actually driving the electronic device in the building, so the evaluation is substantially after the building is completed, and even if a shield failure is detected, the repair work is performed. However, there was a problem that there was a disadvantage in terms of construction period and cost.
[0004]
The present invention was made to solve the above-described problems, and detects failure of electromagnetic wave shielding on the walls of a building during construction, and at that time, measures are taken to shorten the construction period and reduce costs. An object of the present invention is to provide an electromagnetic wave shield defect detecting device.
[0005]
[Means for Solving the Problems]
In view of the above object, the present invention provides a plurality of electrodes arranged in parallel on both sides of a surface subjected to electromagnetic wave shielding, a current supply means for flowing a current between the paired electrodes, and a magnetic flux Detecting means for detecting a magnetic field due to the current by a detector to detect a defective portion of the shield on the surface, and the current supply means generates a current, and a signal generator from the signal generator A conductive wire for supplying current to each electrode, a guide disposed on both sides of the surface and extending along the electrode, and a flexible conductor plate extending to the electrode side and making electrical contact therewith are provided along the guide. The electromagnetic wave shield defect detecting apparatus is characterized in that the movable knob is provided, and the conductive wire is connected to the movable knob .
[0006]
Further, the movable knob has a plurality of flexible conductor plates that contact different electrodes.
[0007]
In addition, an electrode contact portion that extends in parallel with each other on both sides of the electromagnetic shielded surface, contacts an electrode, current supply means for passing a current between the pair of electrode contact portions, and a magnetic flux detector Detecting means for detecting a magnetic field due to current and detecting a defective portion of the shield on the surface, wherein the current supply means generates a current, and the current from the signal generator is contacted with the electrode. A conductive wire to be supplied to the surface, a guide disposed on both sides of the surface and extending along the electrode contact portion, and an electrode pressed by the electrode contact portion of the surface, and sufficient electrical continuity with the surface. A movable knob that has a shape to obtain and a pressing mechanism, is movable along the guide and is pressed to a desired position of the electrode contact portion, and the conductive wire is connected to the movable knob. EMI shielding In the detection device.
[0008]
Further, the surface subjected to electromagnetic wave shielding is a surface obtained by welding and bonding a plurality of conductive plates, and the detection means for detecting a defective portion extends between the movable knobs on both sides of the surface, together with these. It is characterized by comprising a moving support plate and a magnetic flux detector arranged at a portion closest to the welded portion of the surface on the support plate.
[0009]
Moreover, the said conducting wire connected to the said movable knob was distribute | arranged along the said support plate, It is characterized by the above-mentioned.
[0010]
Further, a part of the conducting wire is a stranded wire.
[0011]
Further, the present invention is characterized in that a cable shield coaxial pipe is disposed in a pair on a part of the conducting wire, and a ferrite layer is provided on the outer shell of the coaxial pipe.
[0012]
Further, the surface subjected to electromagnetic wave shielding is a wall of a building.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
The present invention will be described below according to each embodiment.
Embodiment 1 FIG.
1A and 1B show the configuration of an electromagnetic wave shield defect detection apparatus according to Embodiment 1 of the present invention. FIG. 1A is a plan view, FIG. 1B is a side view seen through, and FIG. 1C is an enlarged view of an electrode portion. FIG. In the figure, 1 is a wall of a building, 2 is a welded part, 3 is a gap due to a defective part of a melted part, 4 is an electrode, 5 is a conducting wire, 6 is a radiating magnetic field, 7 is a magnetic flux detector, 8 is a magnetic flux detector 7 Wiring, 9 is a magnetic flux measuring device, 10 is a current, and 11 is a signal generator.
[0017]
As shown in FIG. 1A, in this structure, a plate-like wall 1 made of a conductor having a welded portion 2 at the center is used as a constituent part of an electromagnetic shielding material such as a building. In this electromagnetic wave shielding material, if there is a gap 3 due to a defect in the welded portion 2, electromagnetic waves leak from that portion, leading to deterioration of the shielding ability of the entire building.
[0018]
In order to detect the gap 3 due to this defect, electrodes 4 are provided in pairs at both ends of the welded portion 2 as shown in FIG. By passing a high-frequency current 10 from a signal generator 11 through 5, an electromagnetic wave is generated in a defective portion of the welded portion 2, that is, in the gap 3.
[0019]
Of the electromagnetic waves from the gap 3, a radiated magnetic field (magnetic flux) 6 is detected by a magnetic flux detector 7 or the like, thereby detecting the gap 3 due to a defect in the welded portion 2. FIG. 1B shows the electrode 4 seen through from the side, and FIG. 1C shows an example of the connection between the electrode 4 and the conductor 5.
[0020]
Embodiment 2. FIG.
FIG. 2 shows the state of the conducting wires 5a and 5b connecting the signal generator 11 and the electrode 4 of the electromagnetic wave shield defect detecting apparatus according to the second embodiment of the present invention. As shown in the figure, the conductive wire 5 that is the wiring portion is a stranded wire, thereby reducing the generation of inductive noise due to the wiring portion.
[0021]
Embodiment 3 FIG.
FIG. 3 shows the state of the conducting wire 5 that connects the signal generator 11 and the electrode 4 of the electromagnetic wave shield defect detecting apparatus according to Embodiment 3 of the present invention. As shown in the figure, the conductor 5 which is a wiring portion is covered with a cable shielding coaxial tube 12, and a ferrite layer 13 is provided on the outer shell to reduce the generation of inductive noise.
[0022]
Embodiment 4 FIG.
4 to 6 show the configuration of an electromagnetic wave shield defect detection device according to Embodiment 4 of the present invention. FIG. 4 is a plan view, and FIG. 5 is a transparent side view of the wall of the portion A in FIG. FIG. 6 is a perspective enlarged view of a portion A in a planar direction. In each figure, the same or equivalent parts as those in the above embodiment are indicated by the same reference numerals. 14 is a movable knob guide for moving the movable knob 16 along the direction of the row of electrodes 4, 15 is an electrode support for supporting the electrode 4 and the movable knob 16, 16 is a movable knob, and 17 is provided on the movable knob 16. It is a flexible conductor plate which contacts the electrode 4 which moves with this. In addition, what the said Embodiment 2 and 3 are given to the conducting wire 5 is shown.
[0023]
In this embodiment, as shown in FIG. 4, in order to connect the conducting wire 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, connected to the conducting wire 5 and The movable knob 16 provided with the flexible conductor plate 17 that is in electrical contact with the electrode 4 is slid along the guide 14. This facilitates the connection and switching between the electrodes 4 and the conductive wires 5.
[0024]
Further, as shown in FIG. 7, for example, flexible conductor plates provided on the movable knob 16 are in contact with a plurality of electrodes 4 as two C-shaped conductor plates 17a and 17b opened in the direction of the electrodes 4. You may be able to do it. Further, the number of conductor plates is not limited to two but may be three or more.
[0025]
Embodiment 5 FIG.
8 to 10 show the configuration of an electromagnetic wave shield defect detection apparatus according to Embodiment 5 of the present invention. FIG. 8 (a) is a plan view, FIG. 8 (b) is a side view, and FIG. FIG. 10 is an enlarged perspective view of a portion B including the magnetic flux detector 20 of FIG. 9. In each figure, the same or equivalent parts as those in the above embodiment are indicated by the same reference numerals. As shown in FIG. 10, a magnetic flux detector 20 is semi-fixed to a metal fitting 21 so as to be position-adjustable in a direction perpendicular to the surface of the wall 1 with a screw structure 22, and a detection result is taken out via a wiring 19. 14a supports the magnetic flux detector 20 together with the metal fitting 21, extends between the movable knobs 16 on both sides and moves together with the movable knobs 16, and 18 designates the metal fitting 21 provided with the magnetic flux detector 20. It is a groove that is semi-fixed on the support plate 14a so that the position can be adjusted in the lateral direction parallel to the surface of the wall 1.
[0026]
In this embodiment, as shown in FIG. 8, as a structure for detecting the radiated magnetic field 7 from the gap 3 due to a defect in the welded portion 2 of the wall 1, between the movable knobs 16 in the electrodes 4 at both ends of the wall 1. The support plate 14a is provided, and the magnetic flux detector 20 is installed in a portion of the support plate 14a 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.
[0027]
As shown in FIG. 10, a groove 18 is provided in the longitudinal direction of the support plate 14 a, that is, in a direction parallel to the wall 1, and the magnetic flux detector 20 is provided in the groove 18. The metal fitting 21 is semi-fixed so that the position in the direction parallel to the wall 1 of the magnetic flux detector 20 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 can be facilitated, and the position of the magnetic flux detector 20 in the vertical and parallel directions relative to the wall 1 can also be adjusted.
[0028]
Embodiment 6 FIG.
FIGS. 11 to 13 show the configuration of an electromagnetic wave shield defect detection apparatus according to Embodiment 6 of the present invention. FIG. 11 (a) is a plan view, FIG. 11 (b) is a side view, and FIG. FIG. 13 is an enlarged plan view of the portion of the movable knob 16a in FIG. In each figure, the same or equivalent parts as those in the above embodiment are indicated by the same reference numerals. As shown in FIG. 12, 16 a is a movable knob that constitutes an electrode itself, and is composed of a spring 25 and a spring support portion 26 for pressing itself against the wall 1 in order to achieve good electrical continuity with the wall 1. In order to increase the mechanism and the contact area, a conical or pyramidal electrode tip 23 formed in accordance with a V-shaped groove 24 formed in the wall 1 is provided.
[0029]
As shown in the figure, the movable knob 16a has an electrode tip 23 which is an electrode itself and is in contact with the wall 1, and has a circular (conical) pyramid shape. Further, by forming a V-shaped groove 24 extending in the same direction as the guide 14 at a portion in contact with the electrode tip 23 of the wall 1, the contact area with the electrode tip 23 is increased, and the wall 1 and the electrode tip 23 are The continuity is good. Further, a spring 25 and a spring support portion 26 fixed to the movable knob 16a between the movable knob 16a and the support portion 15 press the electrode tip 23 against the wall 1 to ensure electrical conduction between the two. . Further, a conducting wire 5 for supplying a high-frequency current flowing through the wall 1 is connected to the movable knob 16a so as to ensure conduction. Thereby, the structure can be simplified, and detection can be performed at arbitrary intervals along the direction of the slide structure.
[0030]
Embodiment 7 FIG.
FIG. 14 shows the configuration of an electromagnetic wave shield defect detection 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, the conducting wire 5 for supplying a high-frequency current flowing through the wall 1 is disposed along the support plate 14 a that supports the magnetic flux detector 20. Thereby, the conducting wire 5 is not caught by the guide 14 or the like, and the conducting wire is easily routed.
[0031]
Furthermore, the conductor 5 on the support plate 14a may be covered with the cable shielding coaxial tube 12 as in the third embodiment, and the ferrite layer 13 may be provided on the outer shell. Further, other portions of the conductive wire 5 may be stranded wires as in the second embodiment.
[0032]
As mentioned above, although several embodiment of this invention was described, this invention is not limited only to the said embodiment, For example, two or more possible combinations etc. of these embodiment are included. Needless to say.
[0033]
Furthermore, the present invention not only detects defects in the welded part of the wall of the building subjected to electromagnetic wave shielding, but generally destroys the defective part where electromagnetic waves may leak due to scratches or cracks on the surface subjected to electromagnetic wave shielding. It can be applied to inspection, and the same effect can be obtained.
[0034]
Furthermore, the present invention can be applied not only to detection of defects in the welded portion of the building wall subjected to electromagnetic wave shielding, but also to detection of electromagnetic wave leakage in other construction methods such as pressure welding and riveting. can get.
[0035]
【The invention's effect】
As described above, according to the present invention, in order to detect a shield defect on a surface subjected to electromagnetic wave shielding, electrodes disposed at both ends of the surface, means for passing a current between these electrodes, and the current Thus, the electromagnetic wave shield defect detecting device is provided with means for detecting a magnetic field at a defective portion of the surface due to the above, so that the defect of the shield on the surface subjected to the electromagnetic wave shield can be easily detected.
[0036]
In addition, since it is characterized by detecting defects in the shielding of the walls of buildings that have been subjected to electromagnetic wave shielding, defects in electromagnetic shielding such as building walls composed of conductors that have been subjected to electromagnetic wave shielding can be detected during building construction. It can be detected relatively easily. As a result, failure of the electromagnetic wave shield is detected during construction, and measures are taken at that time, thereby shortening the construction period and reducing costs.
[0037]
In addition, since it is characterized by detecting a defective portion of a welded portion of a building wall where an electromagnetic wave shield is formed by welding a plurality of conductive plates, the defective portion of the electromagnetic wave shield such as a gap in the welded portion Can be easily detected.
[0038]
In addition, a plurality of electrodes arranged in parallel on both sides of the welded portion, current supply means for passing current between the paired electrodes, and a magnetic flux detector detect a magnetic field in the welded portion. And detecting means for detecting a defective portion, so that defects in a welded portion such as a building wall made of a conductor can be detected relatively easily during the construction of the building. it can. As a result, failure of the electromagnetic wave shield is detected during construction, and measures are taken at that time, thereby shortening the construction period and reducing costs.
[0039]
Further, the current supply means includes a signal generator for generating a current, a conductive wire for connecting the current from the signal generator to each electrode, guides arranged on both sides of the weld and extending along the electrode, A movable knob that extends toward the electrode and takes electrical contact with these is provided, and a movable knob that is movable along the guide is provided, and the conductive wire is connected to the movable knob. As a result, the connection and switching between the electrodes and the conductive wires are facilitated.
[0040]
In addition, since the movable knob has a plurality of flexible conductive plates that come into contact with different electrodes, detection can be performed by applying current to a plurality of pairs of electrodes.
[0041]
Further, the current supply means includes a signal generator for generating a current, a conductive wire for connecting the current from the signal generator to each electrode, guides disposed on both sides of the weld and extending along the electrode, And a movable knob having a shape and a pressing mechanism that is configured to be pressed against a wall to obtain sufficient electrical continuity with the wall and movable along the guide, and the conductive wire is attached to the movable knob. Since it is characterized by being connected, the structure can be simplified, and detection can be performed at arbitrary intervals along the direction of the guide.
[0042]
Further, the detection means for detecting a defective portion includes a support plate that extends between the movable knobs on both sides of the welded portion and moves with them, and a magnetic flux detector disposed at a portion closest to the welded portion on the support plate, The magnetic flux detector can be easily moved.
[0043]
In addition, since the conducting wire for connecting current to each electrode is arranged along the support plate, the conducting wire is not caught by a guide or the like, and the conducting wire can be easily routed.
[0044]
In addition, since a part of the conducting wire is a stranded wire, generation of inductive noise can be reduced.
[0045]
Further, since the coaxial pipe for cable shield is arranged in a part of the conducting wire, and the ferrite layer is provided on the outer shell of the coaxial pipe, the generation of inductive noise can be reduced. .
[Brief description of the drawings]
FIG. 1 is a diagram showing a configuration of an electromagnetic wave shield defect detection apparatus according to Embodiment 1 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 Embodiment 2 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 Embodiment 3 of the present invention.
FIG. 4 is a diagram showing a configuration of an electromagnetic wave shield defect detection device according to Embodiment 4 of the present invention.
FIG. 5 is a see-through side view of the wall of the portion A in FIG.
FIG. 4 is a perspective enlarged view of a portion A in a planar direction.
FIG. 7 is a view showing a modification of the electromagnetic wave shield defect detecting apparatus according to Embodiment 4 of the present invention.
FIG. 8 is a diagram showing a configuration of an electromagnetic wave shield defect detecting device according to a fifth embodiment of the present invention.
9 is a transparent front view of a portion of a support plate that supports the magnetic flux detector of FIG. 8. FIG.
10 is an enlarged perspective view of a portion B including the magnetic flux detector of FIG. 9. FIG.
FIG. 11 is a diagram showing a configuration of an electromagnetic wave shield defect detection device according to Embodiment 6 of the present invention.
12 is an enlarged perspective side view of a portion C including the movable knob of FIG. 11. FIG.
FIG. 13 is an enlarged plan view of a portion of the movable knob shown in FIG.
FIG. 14 is a diagram showing a configuration of an electromagnetic wave shield defect detecting apparatus according to Embodiment 7 of the present invention.
[Explanation of symbols]
1 Building Wall, 2 Weld, 3 Gap, 4 Electrodes, 5, 5a, 5b Conductor, 6 Radiation Magnetic Field, 7, 20 Magnetic Flux Detector, 8, 19 Wiring, 9 Magnetic Flux Measuring Instrument, 10 Current, 11 Signal Generator , 12 Cable shield coaxial tube, 13 Ferrite layer, 14 Movable knob guide, 14a Support plate, 15 Electrode support, 16, 16a Movable knob, 17, 17a, 17b Conductor plate, 18 Groove, 21 Hardware, 22 Screw structure , 23 Electrode tip, 24 V-shaped groove, 25 spring, 26 spring support.

Claims (8)

A plurality of electrodes arranged in parallel in pairs on both sides of the electromagnetic shielded surface;
  Current supply means for passing current between the pair of electrodes;
  Detection means for detecting a magnetic field due to the current by a magnetic flux detector to detect a defective portion of the shield on the surface;
  With
  The current supply means includes a signal generator for generating a current, a lead for supplying current from the signal generator to each electrode, guides disposed on both sides of the surface and extending along the electrode, and the electrode side An electromagnetic wave characterized in that a flexible conductor plate that projects in electrical contact with these is provided, a movable knob that is movable along the guide, and the conductive wire is connected to the movable knob. Shield defect detection device. The electromagnetic shielding defect detection device according to claim 1, wherein the movable knob has a plurality of flexible conductor plates that contact different electrodes. An electrode contact portion that extends in parallel on both sides of the electromagnetic shielded surface and contacts the electrode;
  Current supply means for passing a current between the paired electrode contact portions;
  Detection means for detecting a magnetic field due to the current by a magnetic flux detector to detect a defective portion of the shield on the surface;
  With
  A signal generator for generating a current; a conductor for supplying current from the signal generator to the electrode contact portion; and guides disposed on both sides of the surface and extending along the electrode contact portion; The electrode is pressed against the electrode contact portion of the surface and has a shape and a pressing mechanism for obtaining sufficient electrical continuity with the surface, and is movable along the guide and pressed to a desired position of the electrode contact portion An electromagnetic wave shield defect detecting device comprising: a movable knob, wherein the conductive wire is connected to the movable knob. The surface subjected to electromagnetic wave shielding is a surface obtained by welding a plurality of conductive plates, and the detecting means for detecting a defective portion extends between the movable knobs on both sides of the surface and moves together therewith. The electromagnetic wave according to any one of claims 1 to 3, comprising: a support plate; and a magnetic flux detector disposed in a portion closest to the welded portion of the surface on the support plate. Shield defect detection device. The electromagnetic wave shield defect detection device according to claim 4, wherein the conductive wire connected to the movable knob is arranged along the support plate. 6. The electromagnetic wave shield defect detection device according to claim 1, wherein a part of the conducting wire is a stranded wire. The electromagnetic wave shield according to any one of claims 1 to 6, wherein a coaxial tube for cable shield is arranged in a part of the conducting wire, and a ferrite layer is further provided on an outer shell of the coaxial tube. Defect detection device. 8. The electromagnetic wave shielding defect detection device according to claim 1, wherein the surface subjected to electromagnetic wave shielding is a wall of a building.

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