JPH025596Y2 - - Google Patents

Description

[Detailed explanation of the idea]

[Industrial Application Field] The present invention relates to an electromagnetic shielding device for a panel provided with a metal face plate. [Prior Art] In order to eliminate leakage of electromagnetic waves in a shielded room, it is required to connect adjacent panels without interfering with electrical conductivity, and it is also required to eliminate minute gaps. Conventionally, adjacent panels can be connected using methods such as (A) using conductive gaskets, (B) mechanically fastening them with clamps, and (C) welding. For example, in Fig. 1, 1 is a core material with metal shield plates 2 on both sides, the edges of which are bent to wrap around the panel frame material, and a shield joint is installed at the joint C between panel A and panel B. material (conductive packing material) 3 - (A), or the second
In the figure, there is also known a structure (B) in which panels A and B are tightened at a joint C with an external clamp 4 and an internal clamp 5 with screws 6. However, method A involves manufacturing errors in the panels, making it difficult to tighten the conductive packing uniformly on all panels under the same conditions, resulting in variations in the performance of the shield room.
Method B requires that the clamp and panel always be connected with a certain level of fastening force; therefore,
It is necessary to install a large number of bolts very precisely, and in this case, a large number of bolts must be managed with a fastening force that is always above a certain level. Furthermore, when the panel is warped or otherwise distorted, there is a problem in that gaps are formed and performance deteriorates. Furthermore, method C involves welding, which is a complicated construction method and increases costs. [Problems to be Solved by the Invention] In view of the above-mentioned circumstances, the present invention relates to electrically connecting adjacent panels using a conductive tape coated with a conductive adhesive. [Means for solving the problems] The present invention will be explained with reference to the drawings. A core material 11 is made of foamed polyurethane resin or the like, and metal face plates 12 are provided on both sides of the core material 11. The edge of the metal face plate 12 is bent to form a bent portion 13. Reference numeral 14 denotes a conductive tape coated with a conductive adhesive, and the conductive tape 14 is attached so as to cover the joints Z of the adjacent panels X and Y. Reference numeral 15 denotes a panel connecting piece for fixing adjacent panels, which is installed on the conductive tape 14 at appropriate intervals, and its both ends are fixed to panels A and B with screws (bolts) 16. As described above, the present invention uses conductive tape, which enables sealing with almost no gap.
It is possible to follow manufacturing errors when manufacturing the panel and warping and waving of the metal face plate, and there is no gap, and there is electrical surface contact, resulting in a connection with a small voltage drop. . Furthermore, since it is conceivable that the panels may move and the conductive tape may be cut when force is applied to the shield room, such as during an earthquake, a panel connecting piece is provided to connect adjacent panels. [Example] Example A shield room (9 m x 6 m x 3 m) was connected with panels using the device according to the present invention, and the shielding effect was measured. The measurement method is based on MIL-285 by the Mechanical and Electronic Inspection and Certification Association, and the measuring equipment is: Signal generator TR4511 Field strength meter manufactured by Tageta Riken ESH3 ESVP manufactured by Rohde Schwarz GmbH Antenna Transmission side LP− 105A Singer VA−105A 〃 DM−105A 〃 Receiving side LP−105A 〃 VA−105A 〃 DM−105A 〃 are used, and the walls are made of urethane foam with a thickness of 42 mm using aluminum plates with double-sided plates of 0.8 mm. panel, and the conductive tape is Sumitomo 3M embossed copper foil tape No.
I used 1245. Magnetic field measurement frequency 1.0 using the method shown in Figures 4 and 5.
Using electric field measurement frequencies of 1.0, 18, and 30MHz, we obtained the following measurement results. However, d ₁ =
d ₂ = 12 inches (30.5cm) Measurement result Shield room right wall

[Effect of idea]

Since the present invention uses conductive tape to adhere, it is possible to achieve a shield with good performance without any gaps, and it is possible to achieve electrical coupling with a small voltage drop.
There is no manufacturing variation. Further, even if a force such as an earthquake is applied, the shielding effect will not change because of the panel connecting pieces provided between the panels.

[Brief explanation of the drawing]

Fig. 1 is a side view of a device using a conventional conductive packing, Fig. 2 is a side view of a device using a conventional clamp, Fig. 3 is a side view of the present invention, Fig. 4,
FIG. 5 is an explanatory diagram of the apparatus used in the embodiment of the present invention, FIG. 4 is for magnetic field measurement, and FIG. 5 is for electric field measurement. 11...core material, 12...metallic face plate, 13...
Bent portion, 14... Conductive tape, 15... Panel connection piece, 16... Screw.

Claims (1)

[Scope of utility model registration request] A conductive tape with a conductive adhesive layer is applied to cover both sides of the core material to cover the joints of panels with metal faceplates bent at the edges. An electromagnetic shielding device for panel joints that has a panel connection piece on top of the tape that is attached between the face plates and fixes the panel.