JP2005109161A - Electric wave absorber - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electric wave absorber capable of simply assembling at a construction field, and of reducing a transportation cost. <P>SOLUTION: The electric wave absorber for absorbing electric waves is formed into a pyramid shape or a wedge shape without using a bonding adhesive or an adhesive by assembling plate-shaped molded structures 2 each having a polygonal shape. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

The present invention relates to a radio wave absorber disposed in a place where radio waves are absorbed, such as an anechoic chamber.

Pyramid-type and wedge-type filled type wave absorbers are heavy and bulky, and therefore costly to transport. In contrast, hollow and assembled wave absorbers are lightweight and can be transported in a folded state, reducing transportation costs, but they require labor and time to use adhesives and adhesives during assembly. (See Patent Document 1 or 2). Or, the test specimen or the carriage collided while using the anechoic chamber and the radio wave absorber was damaged, and the damaged radio wave absorber could not be easily replaced.
JP-A-11-87978 Japanese Patent Laid-Open No. 2001-127383

The problem to be solved is to provide a radio wave absorber that can be easily assembled at a construction site. Another object is to provide a radio wave absorber that can reduce transportation costs. Alternatively, an object of the present invention is to provide a radio wave absorber that does not use an adhesive or an adhesive when assembling. Another object of the present invention is to provide a radio wave absorber that can easily replace the radio wave absorber body in the event of breakage.

The present invention resides in a radio wave absorber formed by assembling a plate-shaped molded body having a polygonal shape into a pyramid type or a wedge shape without using an adhesive or an adhesive material.

The radio wave absorber of the present invention can provide a radio wave absorber that can be easily assembled at a construction site. Alternatively, a radio wave absorber that can reduce transportation costs can be provided. Alternatively, it is possible to provide a radio wave absorber that does not use an adhesive or a pressure-sensitive adhesive during assembly. Alternatively, it is possible to provide a radio wave absorber that can easily replace the radio wave absorber body in the event of breakage.

<1> Radio wave absorber The radio wave absorber has a radio wave absorption capability, and a plate-like molded body having a polygonal shape is mechanically fitted or pinned without using an adhesive or an adhesive. It is assembled by forming a pyramid-type or wedge-shaped radio wave absorber body and fixing the radio wave absorber body to the bottom plate. Since no adhesive is used for assembly, when the radio wave absorber body is damaged, the radio wave absorber body can be separated from the bottom plate and easily replaced.

<2> Polygon-shaped molded body A polygon-shaped molded body has a polygonal shape such as a triangle or a quadrangle, and forms a pyramid shape or a wedge shape. The assembly of the molded body is coupled by fitting or pinning. The molded body includes a wave absorber body for forming a pyramid or wedge shape and a bottom plate for fixing, and has a plate shape or a board shape.

  For the main body of the radio wave absorber, one that can absorb radio waves is particularly good, and a plastic material such as polystyrene, polystyrene, or polyurethane is used, and at least one kind of carbon, metallic fine particles, metallic fibers, or the like is contained therein. . A conductive layer such as a conductive sheet or a conductive film is formed on one or both surfaces of the molded body. As the material, in particular, expanded polystyrene, expanded styrene, expanded urethane and the like are used. The material for the bottom plate may be the same as that for the radio wave absorber body, or may be a material having no radio wave absorbability or a small material. Further, the molded body is preferably nonflammable or semi-incombustible.

  For fitting, a protrusion having a convex shape or a protrusion formed at a predetermined location such as an end of the molded body is provided. In addition, a groove portion in which a groove, a hole, a hole, a concave shape, a notch, or the like is formed is provided at a predetermined portion such as an end portion of the molded body. A plurality of molded bodies can be combined by fitting the protrusion into the groove.

  For pinning, it is preferable to make a hole in one molded body and fix the pin to the other molded body. When the radio wave absorber body is fixed to the bottom plate, the bottom plate is preferably one in which the pin is firmly fixed, for example, a foam is preferable. The pin is preferably one that does not easily reflect radio waves, and is preferably made of resin or non-metallic. It is preferable that the pin has a structure that is difficult to be removed, for example, the tip is opened.

A tip cover may be attached to the pyramid or wedge tip. The tip cover covers the tip, protects the wedge-shaped tip, and can be fixed so that the adjacent molded body does not open. The tip cover is preferably made of a material that hardly reflects radio waves, and is preferably made of resin or non-metallic.

<3> Bending of molded body When a molded body is folded to form a pyramid or wedge shape, a sheet-like material is provided at a location where the molded body is bent. For example, cloth, paper, cloth, etc. can be used as the sheet-like material. A sheet-like material is affixed to the front surface or the back surface of the molded body, and the folded molded body is connected with the sheet-like material.

<1> Example 1
Example 1 of the radio wave absorber is shown in FIG. The radio wave absorber body 1 in FIG. 1 has a mixed shape of a pyramid type and a wedge type. The radio wave absorber body 1 is formed by combining two triangular molded bodies 2 and two deformed deformed hexagons 2. The radio wave absorber body 1 is assembled by fitting the projections 21 of the triangular molded body 2 and the grooves 22 of the deformed hexagonal molded body 2 together. The contact portion of the two deformed hexagonal molded bodies 2 may be covered with a tip end cover 4. The front end cover 4 protects the front end of the radio wave absorber body 1 and prevents the two deformed hexagonal molded bodies 2 from spreading to fix the two deformed hexagonal molded bodies 2. it can.

The bottom plate 3 is inserted from the lower opening of the radio wave absorber body 1 and is fitted into the lower part of the radio wave absorber body 1. The bottom plate 3 and the radio wave absorber body 1 are fixed with pins 5 at a predetermined position inside the radio wave absorber body 1. If the pin 5 is removed, the bottom plate 3 and the radio wave absorber body 1 can be easily separated. The bottom plate 3 of FIG. 1 shows an example in which a thick molded body 2 such as a foam is used. In this case, the pin 5 can be easily inserted into the end of the bottom plate 3. As the bottom plate 3, a thin molded body 2 can be used as will be described later.

<2> Example 2
Example 2 of the radio wave absorber is shown in FIG. The radio wave absorber body 1 of FIG. 2 has a shape in which two radio wave absorbers 1 of the first embodiment are arranged. Three or more shapes can be arranged. The radio wave absorber body 1 is formed by combining four triangular molded bodies 2 and a complex polygonal molded body 2. At this time, the corresponding protrusion 21 and groove 22 of each molded body 2 are fitted. A tip cover 4 is attached to each of the two tip portions of the radio wave absorber body 1. The bottom plate 3 is fitted from the lower opening of the radio wave absorber body 1 and fixed to each other with the pins 5.

<3> Example 3
Example 3 of the radio wave absorber is shown in FIG. The radio wave absorber body 1 in FIG. 3 forms a pyramid type radio wave absorber 1. The radio wave absorber body 1 is formed by bending a single polygonal molded body 2. At this time, the corresponding protrusion 21 and groove 22 of the molded body 2 are fitted. A groove or a sheet-like material is preferably stretched at the bent portion of the molded body 2. The bottom plate 3 is fitted from the lower opening of the radio wave absorber body 1 and fixed to each other with the pins 5. The bottom plate 3 is a thin molded body 2 and its end is bent to form a bending fixing portion 31 so that the pin 5 can be locked there. The bending fixing part 31 is only required to be able to fix the radio wave absorber body 1 and is formed, for example, on two to four sides of the side part.

<4> Example 4
Example 4 of the radio wave absorber is shown in FIG. The radio wave absorber body 1 in FIG. 4 forms a wedge-shaped radio wave absorber 1. The radio wave absorber body 1 is formed by bending a single polygonal molded body 2. At this time, the corresponding protrusion 21 and groove 22 of the molded body 2 are fitted. A groove or a sheet-like material is preferably stretched at the bent portion of the molded body 2. The bottom plate 3 is fitted from the lower opening of the radio wave absorber body 1 and fixed to each other with the pins 5. The bottom plate 3 is a thin molded body 2 and its end is bent to form a bending fixing portion 31 so that the pin 5 can be locked there.

1 is an explanatory diagram of Example 1 of a radio wave absorber according to the present invention. FIG. Explanatory drawing of Example 2 of the electromagnetic wave absorber of this invention. Explanatory drawing of Example 3 of the electromagnetic wave absorber of this invention. Explanatory drawing of Example 4 of the electromagnetic wave absorber of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Radio wave absorber main body 2 ... Molded body 21 ... Projection part 22 ... Groove part 3 ... Bottom plate 31 ... Bending fixing part 4 ... End part cover 5 ... Pin

Claims (6)

  A radio wave absorber that absorbs radio waves, which is formed by assembling and forming a plate-like molded body having a polygonal shape into a pyramid type or a wedge type without using an adhesive or an adhesive. The radio wave absorber according to claim 1,
One end of the molded body has a protrusion, the other end has a groove, and the protrusion is formed into a pyramid or wedge shape in a state of being fitted in the groove, Radio wave absorber. The radio wave absorber according to claim 1,
A radio wave absorber characterized in that a pyramid-type or wedge-type tip portion is covered with a tip cover made of resin or nonmetal, and fixed so that the tip portion does not open. The radio wave absorber according to claim 1,
One molded body is bent at the center to form a wedge-shaped wave absorber body, and the other molded body is arranged from the inside of the radio wave absorber body and formed as a bottom plate. An electromagnetic wave absorber characterized by. The radio wave absorber according to claim 1,
An electromagnetic wave absorber characterized in that the bent portions of the molded body are joined by a sheet-like material. The radio wave absorber according to claim 1,
A radio wave absorber comprising a pyramid-type or wedge-type radio wave absorber body and a bottom plate, wherein the radio wave absorber body is detachably attached to the bottom plate with a resin or non-metal pin. .

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