Multilayer casing device for attenuating electromagnetic waves

Abstract

A multilayer casing device for attenuating electromagnetic waves is made of at least one textile material, at least one metal material. The device is made up of a stack provided with at least, consecutively from the inside to the outside: a first diamagnetic metal material layer at least partially made of copper, a second textile layer at least partially made of wool or cotton, a third layer made of a ferromagnetic material, and a fourth textile layer at least partially made of wool and cotton. The device is also made up of a complementary stack of identical layers (the second textile layer, the third ferromagnetic layer and the fourth textile layer) extending symmetrically in relation to the first copper layer.

Claims

1. A multilayer casing device for attenuating electromagnetic waves, made of at least one textile material and of at least one metallic material, comprising a superimposition provided with at least, successively: a textile first layer at least partly in wool or cotton; a second layer made of a ferromagnetic material; a textile third layer at least partly in wool or cotton; a fourth layer made of metallic diamagnetic material made at least in part of copper; a textile fifth layer at least partly in wool or cotton; a sixth layer made of a ferromagnetic material; and a textile seventh layer at least partly in wool or cotton.

2. The casing device according to claim 1, wherein said second layer is metallic and made at least in part of steel wool.

3. The casing device according to claim 2, further comprising at least one peripheral protection layer.

4. The casing device according to claim 3, wherein all layers are fastened together, stitched at least at their perimeter.

5. The casing device according to claim 1, further comprising at least one peripheral protection layer.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) Other features and advantages of the invention will become apparent in the following description of non-limiting embodiments of the invention with reference to the appended FIGURE that represents schematically the superimposition of different layers according to a preferred embodiment of said casing device.

DETAILED DESCRIPTION OF THE EMBODIMENTS

(2) The present invention concerns particularly a multilayer casing device 1 for attenuating electromagnetic waves.

(3) Such a device 1 is made of at least one textile material and at least one metallic material. More specifically the invention consists of a synergy of the actions of several layers made of metallic and textile materials, placed in adjacent manner.

(4) Advantageously, said device 1 is made of a superimposition provided with at least, successively from the inside to the outside, a first layer 2 made of preferably metallic diamagnetic material, a textile second layer 3 exhibiting dipolar electrostatic characteristics, a third layer 4 made of preferably metallic ferromagnetic material, a textile fourth layer 5 exhibiting dipolar electrostatic characteristics.

(5) More specifically, said diamagnetic first layer 2 is metallic and made at least partly of copper, the textile second layer 3 is made at least partly of wool or cotton, the ferromagnetic and metallic third layer 4 is at least partly made of steel wool, whereas the textile fourth layer 5 is at least partly made of wool or cotton.

(6) According to the preferred embodiment, said first layer 2 is made from one sheet of copper or a copper-plated sheet or one mostly made of copper. This sheet may have several thicknesses, in particular of the order of a millimeter.

(7) Moreover, the textile second 3 and fourth 5 layers can be identical, made of a woven material of natural fibers of wool or cotton or of a mixture of both. The function of these two types of textile is to provide an insulating layer between the copper and the steel as well as between the steel and the outside. Thus, a layer with dipolar electrostatic properties is created, which generates a different field when the electromagnetic radiation goes through it.

(8) Moreover, said third layer 4 can be made of a steel wool fibrous mat, whose thickness can vary, in particular of the order of one millimeter. In addition, said steel wool's grade can vary: nos. 0000, 0 or 5. This layer 4 provides a Casimir effect, altering the electromagnetic field to transform it at least in part into photons. In addition, this Casimir effect is amplified through to the core of the casing 1 constituted by the central copper layer.

(9) According to the preferred embodiment, shown in the FIGURE, said casing device 1 can be made of a complementary superimposition of identical layers extending symmetrically in relation to said first copper layer 2. In effect, the copper acts as the central core of the casing 1 and layers made of identical material alternate symmetrically on either side, namely the second layer 3 made of wool or cotton, the third layer 4 made of steel wool and the fourth layer 5 made of wool or cotton.

(10) It should be noted that even though the layers are identical, the thickness and composition of the layers may vary. In addition, said second layer 3 or third layer 4 on one side can be made of wool, while it is made of cotton on the other side, or vice-versa.

(11) Advantageously, this particular combination of said superimposed layers 2, 3, 4, 5 generates an effect channeling the electromagnetic radiation towards the first copper layer 2, which then acts as the receiving core at the center of the material, the radiation then converges towards the copper sheet.

(12) Furthermore, the alternating conducting and insulating layers provide an effect of absorption by the ferromagnetic layers 4 and an effect of transformation of the electromagnetic radiation into photons at the location of the copper layer 2, the latter, being diamagnetic, is therefore insensitive to magnetic fields.

(13) According to the same preferred embodiment, said device 1 may comprise at least one peripheral protection layer 6. The latter can be made of a coating layer 6 made of an inert material, with no influence when an electromagnetic field goes through it. It then only acts as a coating, as an esthetic and protective covering.

(14) According to an embodiment, said peripheral layer 6 can be made of natural or synthetic leather.

(15) In order to make the casing device 1 conform to its use, said layers 2, 3, 4, 5, 6 are fastened together, in particular stitched at least at their perimeter.

(16) It should be noted that the layers 2, 3, 4, 5, 6 adjoin each other, with no space between them.

(17) Furthermore, in the preferred case of use as a cellular telephone shell or pouch, the casing 1 according to the invention can be cut and stitched according to the dimensions of said telephone. In addition, support flaps or straps can be added to fasten the telephone to its shell.

(18) According to other uses, said device 1 can be conformed to adapt to other terminals, in particular computers, tablets, microwaves, etc.

(19) In this way, the casing device 1 according to the invention makes it possible to attenuate the radiation emitted by a terminal, in particular a cellular telephone, without this completely blocking the electromagnetic field, ensuring the connection of the apparatus to its communications network.

(20) Furthermore, the invention is designed to be simple for large-scale manufacturing, with low cost materials keeping manufacturing costs low.