JP2508783Y2 - Radio wave scattering and absorbing material made of synthetic resin - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a synthetic resin radio wave scattering / absorbing material that has a large radio wave absorption rate and is not melted and has a large mechanical strength.

[Conventional technology]

2. Description of the Related Art Conventionally, a radio wave absorber is used for a radio wave leakage prevention part in an electronic device for preventing radio wave leakage, for example, a microwave oven, a receiver, a receiver, a floppy disk drive device or the like. This radio wave absorber has a radio wave attenuation constant of 8 dB or more. In this product, 70% by weight or more of ferrite is contained in a thermoplastic synthetic resin such as polypropylene or vinyl chloride.

[Problems to be solved by the invention]

Therefore, this radio wave absorber has a large absorptivity when the radio wave is large, and may damage the device by melting the base material containing the ferrite and has a large ferrite content. Therefore, the mechanical strength is weak, the weight is large, for example, the specific gravity is 2.5 or more, and since the ferrite content is large, there is a problem that molding is difficult and the thickness cannot be reduced. In addition, most of the conventional electromagnetic wave absorbers used for these purposes are flat plates, and although they have electromagnetic wave absorbing ability, they can not scatter and reabsorb the electromagnetic waves that have not been absorbed by the electromagnetic wave absorbers. There wasn't. The present invention has been made in view of such a current situation, and it is lightweight and excellent in mechanical strength without being melted down. Moreover, even though it is incident on the electromagnetic wave absorber, the electromagnetic wave reflected outside the electromagnetic wave absorber is not absorbed. The purpose of the present invention is to provide a synthetic resin wave scattering / absorbing material that can scatter and reflect in various directions and can re-absorb this scattered wave by re-entering the wave absorbing material. The fixing is made extremely easy.

[Means for solving problems]

In order to achieve the above-mentioned object of the present invention, the present invention comprises a thermoplastic synthetic resin containing 30 to 50% by weight of ferrite and / or magnetite, and continuously or intermittently forms projections or depressions on the surface thereof. It is intended to provide a synthetic resin wave scattering / absorbing material having a thin plate body and an adhesive provided on the inner surface thereof.

[Action]

As described above, the radio wave scattering / absorbing material made of synthetic resin according to the present invention is a thermoplastic synthetic resin containing 30 to 50% by weight of ferrite and / or magnetite, and the projections or depressions are continuously or intermittently formed on the surface. Since it is a plate body formed,
It is a place where an adhesive is used to prevent radio wave leakage, for example, it is stretched over the inner surface of the wall of a room or the electronic device is covered with this member.

〔Example〕

The details of the present invention will be explained based on further illustrated embodiments. The radio wave scattering and absorbing material 1 made of synthetic resin according to the present invention is
30-50% by weight of ferrite such as manganese zinc ferrite, nickel zinc ferrite and / or magnetite
A plate body 3 is formed by continuously or intermittently forming convex portions 2 or concave portions on the surface with a thermoplastic synthetic resin such as polypropylene, vinyl chloride, polyamide, polyphenylene sulfide, polyethylene, etc., which is contained, and an adhesive agent is formed on the inner surface. Four
Is provided. Here, the reason why the thermoplastic synthetic resin is made to contain 30 to 50% by weight of ferrite and / or magnetite is to give a radio wave absorbing effect to the base material, and at the same time, to make its radio wave attenuation constant 2 dB to 5 dB. As a result of such a content ratio of ferrite and / or magnetite, the specific gravity becomes 1.7 or less and the weight becomes light, and since the content ratio of ferrite and / or magnetite is small, the mechanical strength becomes large. In the case of a body, the thickness can be 0.5 to 0.2 mm.
The element is to use the plate body 3 having the convex portion 2 or the concave portion formed on the surface continuously or intermittently with such a material. The convex portion 2 of the plate body 3 may be, for example, one in which a large number of ridges are provided in parallel, one in which various protrusions are intermittently provided, or one in which concave portions are provided in the same manner as described above. The illustrated embodiment is an embodiment of such a radio wave scattering and absorbing material made of synthetic resin. In the figure, 3 is a plate having the above-mentioned radio wave absorption ability, and 2 is an example in which a continuous ridge is used as a ridge, and ridges and ridges are provided alternately. Then, the adhesive 4 is provided on one surface of the concave portion, and the release paper 5 is coated on the surface. Therefore, with the release paper 5 removed, for example, it is attached to the inner surface of the wall of the room where radio waves leak, or to the surface of various equipment, and further, a box-like member is formed using the member. However, by locating the electronic device inside it, it is possible to prevent electric wave leakage and also to have the effect of scattering electric waves by the convex portions and concave portions on the surface.

[Effect of device]

As described above, the synthetic resin radio wave scattering / absorbing material of the present invention is a thin plate body having a convex portion or a concave portion formed on the surface thereof with a thermoplastic synthetic resin containing ferrite and / or magnetite. In addition to being able to be absorbed, it is possible to scatter and reflect a radio wave which is once incident but is not absorbed but reflected in various directions, and a part of the radio wave can be reabsorbed by the convex portion or the concave portion of the adjacent radio wave absorbing material. Also,
The radio wave scattering and absorbing material made of synthetic resin according to the present invention has a content of ferrite and / or magnetite of 30 to 50% by weight and a radio wave attenuation constant of 2 dB to 5 dB, so that it is not melted by excessive heat generation due to radio wave absorption. . In addition, the specific gravity is 1.7 or less, it is lightweight, it has excellent mechanical strength, and it is easy to mold because it contains a small amount of ferrite and / or magnetite. It is easy to use this synthetic resin radio wave scattering and absorbing material that has a thin and uneven shape. Can be manufactured. Furthermore, since the radio wave scattering and absorbing material made of this synthetic resin has an adhesive layer on the inner surface, it is possible to easily attach it to a location where radio wave leakage is prevented by using this adhesive. Since the radio wave scattering / absorbing material made is lightweight, it can be maintained in a mounted state only by fixing with an adhesive.

[Brief description of drawings]

1 is a perspective view for explaining an embodiment of a radio wave scattering and absorbing material made of synthetic resin according to the present invention. 1: Radio wave scattering and absorbing material, 2: Convex part, 3: Plate, 4: Adhesive, 5: Release paper.

Claims (2)

(57) [Scope of utility model registration request] 1. Ferrite and / or magnetite of 30 to
A synthetic resin radio wave scatterer that is made by forming a thin plate made of thermoplastic synthetic resin containing 50 wt% on the surface continuously or intermittently, and providing an adhesive on the inner surface. Absorbent material. 2. The radio wave scattering and absorbing material made of synthetic resin according to claim 1, wherein the convex portions are convex stripes arranged in parallel.