JP4403444B2 - Rubber frame and radio wave absorption structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a rubber frame for mounting a radio wave absorption plate having a radio wave absorption function on a ceiling of a structure such as a toll gate on a toll road.
[0002]
[Prior art and problems to be solved by the invention]
For example, on a toll road, radio communication is frequently performed between a toll booth and a transceiver, and radio waves are scattered in the air, which causes various communication malfunctions. Therefore, a radio wave absorbing plate capable of absorbing radio waves is attached to the ceiling of the structure of the toll gate. As a method for absorbing radio waves, a radio wave absorbing plate is fitted into the frame, and the frame and the radio wave absorbing plate are attached to the structure. However, in such a method, the radio wave cannot be absorbed completely because the radio wave is not absorbed in the frame. Such a problem similarly occurs when the radio wave absorber is attached to another structure.
Accordingly, an object of the present invention is to provide a rubber frame that can absorb radio waves.
[0003]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a rubber frame having a mounting groove for sandwiching a peripheral edge of a radio wave absorption plate, and the mounting groove being connected in a loop shape, A soft magnetic material powder other than the above is added to rubber.
[0004]
In the present invention, the soft magnetic powder other than carbon is preferably added in an amount of 1% by weight or more.
In the present invention, as the radio wave absorbing plate, a rubber plate in which ferrite is added to a main material such as rubber, or a laminated plate in which a metal reflective layer and / or a resin plate are laminated on the rubber plate may be employed. it can.
[0005]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows a bottom view of the first embodiment. In this embodiment, the case where the two radio wave absorbing plates 1 and 1 are attached to the attachment surface 2 such as the ceiling of the structure in the state of being arranged in parallel is illustrated. The radio wave absorbing plates 1 and 1 are flat and have a substantially rectangular shape in plan view, and are formed by molding a soft magnetic material, for example, rubber added with ferrite, pure iron, or nickel powder. Add carbon accordingly. The radio wave absorbing plates 1 and 1 have a function of damaging the intensity of the incident radio wave by converting the energy of the incident radio wave into heat energy. However, since the radio wave absorbing plate 1 is formed in a flat shape with rubber which is an elastic body, the rigidity is relatively low, but a resin plate such as acrylic or a reflecting member may be laminated.
[0006]
A rubber support frame 3 is attached to the end edge portions of the radio wave absorbing plates 1 and 1 so as to sandwich the end edge portion so as to surround the entire periphery. The support frame 3 has a “day” -shaped planar shape that can be attached to the entire circumference of the end edges of the two wave absorbers 1, 1 arranged side by side.
[0007]
2A and 2B show an enlarged sectional view taken along line AA and an enlarged sectional view taken along line BB in FIG. As shown in FIG. 2A, support piece portions 3 a and 3 b for holding the radio wave absorbing plate 1 only on the inner side where the radio wave absorbing plate 1 exists are protruded and formed on the outer support frame 3. Yes. A mounting groove 5 into which the edge of the radio wave absorbing plate 1 enters is formed between the support pieces 3a and 3b. As shown in FIG. 2B, support piece portions 3c and 3d for holding the radio wave absorbing plates 1 and 1 on both sides where the radio wave absorbing plates 1 and 1 exist are protruded from the support frame body 3 at the center. Is formed. A mounting groove 6 into which the end edge portion enters is formed between the support piece portions 3c and 3d. The mounting grooves 5 and 6 are formed in a loop.
[0008]
FIG. 3 is a partially cutaway perspective view of the support frame portion 3. An anchor portion 9 is integrally formed with the support frame 3. The anchor portion 9 has a main body portion 9a that protrudes in a direction orthogonal to the radio wave absorbers 1 and 1 attached to the support frame 3, and extends from both side surfaces of the main body portion 9a in the anti-projection direction of the main body portion 9a. A plurality of lips 9b.
[0009]
Further, a mounting member 10 is fixed to the mounting surface 2 of FIG. The attachment member 10 has a holding groove portion 10a and has a substantially inverted U-shaped cross section. The groove width of the holding groove portion 10a is set to be slightly smaller than the distance between the tips of the lips 9b, 9b on both sides of the anchor portion 9. Accordingly, the anchor portion 9 is pushed into the holding groove portion 10a while each lip 9b is elastically deformed inward, and the radio wave absorbing plates 1 and 1 are sandwiched by the support piece portions 3a, 3b, 3c, and 3d of the support frame 3. In this state, it is pressed against the contact piece 10b of the mounting member 10. In this way, the front end portion of each wedge piece 9b is pressed against the inner surface of the holding groove portion 10a by elastic deformation, thereby preventing the anchor portion 9 from coming off from the holding groove portion 10a.
[0010]
In the mounting structure, after attaching the support frame 3 to the edge of the radio wave absorbing plates 1 and 1, two radio wave absorbing plates can be obtained by a simple operation of pushing the anchor portion 9 into the holding groove portion 10a. 1 and 1 can be mounted very quickly so as to cover the mounted surface 2 in a positioning state facing the mounted surface 2 substantially in parallel. Further, the radio wave absorbing plates 1 and 1 themselves have low rigidity because they do not include a resin plate or a radio wave reflecting plate, but the end edges of the radio wave absorbing plates 1 and 1 are sandwiched by the support frame 3 over the entire circumference. Therefore, it is held in a robust mounting state.
[0011]
Further, when performing the installation of attaching the radio wave absorbing plates 1 and 1 to the mounting surface 2 using the mounting structure, the support frame 3 is temporarily attached to the radio wave absorbing plates 1 and 1 in advance at the factory by, for example, an adhesive means. In this state, the mounting member 10 is transported to the mounting site, and the mounting member 10 is attached to the mounting surface 2 with screws 11 in accordance with the arrangement shape of the anchor portion 9 of the support frame 3 attached to the radio wave absorbing plates 1, 1. If fixed, the radio wave absorbing plates 1, 1 can be attached to the attachment surface 2 by almost one-touch operation of pushing the anchor portion 9 into the holding groove portion 10 a of the attachment member 10. Therefore, the mounting construction method using this mounting structure can sufficiently cope with the mounting of the radio wave absorbers 1 and 1 to the structure of the toll gate on the toll road where the working time is severely limited.
[0012]
FIG. 4A is a schematic bottom view showing a modification of the first embodiment, and FIG. 4B is an enlarged sectional view taken along the line CC of FIG. 4A. In these drawings, the same or equivalent parts as in FIG. In this mounting structure, two mounting structures of the first embodiment shown in FIG. 1 are provided side by side, and four radio wave absorbing plates 1 are mounted on the mounting surface 2. Therefore, the AA line cutting enlarged sectional view and the BB line cutting enlarged sectional view of FIG. 4A are as shown in FIGS. 2A and 2B. As shown in FIG. 4 (b), the two adjacent mounting members 10 and 10 are provided in such a manner that their opposing surfaces are in contact with each other, as shown in FIG. 4 (b). Strength is further improved.
[0013]
In the embodiment described above, the support frame 3 for mounting the radio wave absorbing plate 1 to the mounting surface 2 so as to face the mounting surface 2 has been described. However, in the present invention, as shown in FIG. The present invention can also be applied to the support frame 3A for mounting substantially perpendicular to the mounted surface 2.
[0014]
【The invention's effect】
As explained above, according to the rubber frame and the radio wave absorption structure of the present invention, the radio wave is absorbed by the radio wave absorption plate because the frame is formed of rubber added with a soft magnetic material powder other than carbon. In addition to the above, the rubber frame can absorb radio waves, so that the radio wave absorption effect is further enhanced.
[Brief description of the drawings]
FIG. 1 is a bottom view showing a mounting structure of a radio wave absorber according to a first embodiment of the present invention.
2A is an enlarged sectional view taken along the line AA in FIG. 1, and FIG. 2B is an enlarged sectional view taken along the line BB.
FIG. 3 is a cutaway perspective view showing a part of the support frame.
4A is a bottom view showing a modification of the first embodiment, and FIG. 4B is an enlarged sectional view taken along the line CC of FIG. 4A.
FIG. 5 is a partially sectional perspective view showing a modification of the support frame of the present invention.
[Explanation of symbols]
1: Radio wave absorbing plate 2: Mounted surface 3, 3A: Support frame (frame)
5, 6: Mounting groove

Claims (4)

A rubber frame having a mounting groove for sandwiching the peripheral edge of the radio wave absorbing plate, and wherein the mounting groove is connected in a loop;
A rubber frame in which soft magnetic powder other than carbon is added to rubber. In claim 1,
A rubber frame in which the soft magnetic powder is ferrite, pure iron or nickel, and carbon is added to the rubber. In claim 1,
A rubber frame to which 1% by weight or more of soft magnetic powder other than carbon is added. A radio wave absorption structure comprising a frame body according to claim 1, 2 or 3, and a radio wave absorption plate having a radio wave absorption function.

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