JP4249140B2 - Electromagnetic shield roll screen - Google Patents

Description

  The present invention relates to an electromagnetic shield roll screen for electromagnetic shielding in openings such as windows of buildings.

  In recent years, mobile communication technology has become widespread, and this mobile communication technology is not only used for outdoor communication such as mobile phones and automobile phones, but also for local purposes in buildings. ) Has been used as a data transmission means.

  In such mobile communication, communication devices such as mobile phones (800 MHz band, 1.5 GHz band, 1.9 GHz band), wireless LAN (2.45 GHz band, 5.2 GHz band), PHS (1.95 GHz band) are used. .

  In order to realize high-speed and large-capacity communication inside buildings using such communication equipment, it is necessary to block unnecessary electromagnetic waves from the outside and prevent interference between equipment inside. As one of the means, electromagnetic shielding technology is utilized.

  An electromagnetic shield room using electromagnetic shield technology needs to cover all the surfaces of the walls, floor and ceiling constituting the room with a metal having a low resistivity without any gaps. For this reason, in offices where living is important, it is important how to take shield measures in areas where lighting needs to be maintained, such as windows. It is being considered.

  In general, electromagnetic shielding materials used for building windows include electromagnetic shielding glass and electromagnetic shielding film. For the former electromagnetic shield glass, there is a type in which a conductive layer is formed by interposing a metal mesh material between a pair of glass (generally two layers of float glass), or ITO (indium oxide-tin) on the inner surface of the pair glass There is a type in which a conductive layer is formed by applying or sputtering a metal such as a metal with a thickness that can secure daylighting. The latter includes an electromagnetic shielding film in which a conductive layer is formed by sputtering or coating on a film material having high daylighting properties such as PET.

Moreover, as a prior art regarding the electromagnetic shield of the window of a building, there exist some which are shown by patent documents 1, 2, for example.
Patent Document 1 relates to an electromagnetic shield roll screen in which a conductive screen is attached to a window frame so that the screen can be wound and unwound, and the configuration thereof is located at a screen lead-out position of a head box provided with a winding pipe. Conductive guide rollers that are in contact with the screen are provided, and the guide rails on both sides of the window frame are provided with conductive brushes that are in contact with both side edges of the screen and are arranged along the up-and-down direction of the screen. Furthermore, a conductive plate that can contact a window frame or the like is provided at the lower end of the weight bar attached to the lower end of the screen. The conductive brush and the conductive plate are electrically connected.
Patent Document 2 relates to an electromagnetic shield roll screen in which a conductive screen is attached to a window frame so that it can be wound and unrolled as in Patent Document 1, and the configuration thereof is a head box provided with a winding pipe. The conductive guide roller that comes into contact with the screen is provided at the screen lead-out position, and the guide rails on both sides are in contact with both side ends of the screen and are arranged along the up-and-down direction of the screen. Furthermore, the lower end of the weight bar attached to the lower end of the screen is provided with a conductive plate that can contact the mounting frame, and the screen has a conductive layer inside and a non-conductive layer on the outside. In the configuration where the surface is coated, the conductive belt-like member is formed of conductive yarn on the upper part of the screen, both left and right end parts and the lower part. Have been sewn Te, the screen is obtained by a structure which is electrically connected to the conductive yarn and the conductive strips of each conductive guiding roller through a conductive brush and a conductive plate.

On the other hand, although the fields of use are different, for example, as disclosed in Patent Documents 3 and 4, in a microwave oven, leakage of electromagnetic waves from a door portion is performed using a choke structure.
Japanese Patent Laid-Open No. 11-191689 JP 2000-31681 A Japanese Patent Laid-Open No. 9-14667 JP-A-10-241855

  In the conventional electromagnetic shield roll screen as described above, when an electromagnetic shield film with high daylighting is used as the screen material of the electromagnetic shield roll screen, the conductive layer for demonstrating the shielding performance is very thin. In order to be able to withstand the impact of the above, a reinforcing layer such as PET or hard coat is formed on the surface of the conductive layer. However, since these reinforcing layers are usually formed of an insulator, an electromagnetic gap corresponding to the thickness of the reinforcing layer is generated between the conductive layer and a conductive member such as a guide rail. Therefore, leakage of electromagnetic waves occurs from this gap, so that the electromagnetic shielding performance is significantly deteriorated.

  In addition, in the conventional electromagnetic shield roll screen described above, the guide rail and the screen material are configured to exert electromagnetic shield performance by elastically contacting and conducting via a conductive brush or the like. The screen material is easily rubbed and scratched during the up-and-down movement accompanying the movement.

  If the screen is opened and closed frequently, the elasticity of the conductive brush will deteriorate due to fatigue and sufficient contact pressure will not be obtained, resulting in a gap between the screen material and the conductive brush. Will deteriorate. For this reason, it is necessary to exchange the screen material and the conductive brush in a certain period.

Furthermore, in the conventional apparatus, since necessary play is filled with a conductive brush or the like between the screen material and the guide rail, high-precision construction is desired for installation. This is because when the play is large, a gap is naturally generated, and the electromagnetic shielding performance is significantly reduced.
Therefore, in the present invention, the choke structure used in a radio wave absorber or a microwave oven that is effective in attenuating electromagnetic noise even when electromagnetically non-contacting is rationally applied to the electromagnetic shield roll screen. The purpose is to solve such problems.

  In order to solve the above-described problems, in the present invention, first, a screen material having electromagnetic shielding properties is wound into a roll shape, and a conductive upper winding is configured to be able to enter and exit through an opening provided on the lower side. A conductive guide rail that protrudes downward from the upper winding portion and guides both edges of the screen material, and a conductive guide rail that is provided between the lower ends of the guide rails to contact the lower edge of the screen material. The choke structure is formed on the inner surface side of the opening portion of the upper winding portion and the guide rail opening portion by folding the opening end inward, and the inner surface of the choke structure opening portion and the screen material. An electromagnetic shield roll screen with a gap in between is proposed.

  Moreover, in this invention, it proposes installing an electromagnetic wave absorber in the inside of an opening part in said structure.

  Furthermore, in the present invention, in the above configuration, it is proposed that the screen material is a highly light-lighting screen material in which a light-transmitting protective layer is formed on the surface of a thin conductive layer.

  In the present invention described above, the choke structure is formed on the lower opening of the upper winding portion and the inner surface side of the guide rail opening, so that a gap is formed between the inner surface of the opening of the choke structure and the screen material. Even if formed, the electromagnetic shielding performance at a specific frequency can be exhibited by the choke structure. Furthermore, in the present invention, the electromagnetic wave absorber disposed inside the opening can ensure shielding performance in a frequency band different from that of the choke, and by combining these, a wide frequency band can be covered.

  For this reason, even when a highly daylighting screen material is used that has a very thin conductive layer to enhance daylighting and an insulating reinforcing layer is formed on the surface, excellent electromagnetic shielding performance is achieved. It can be demonstrated.

  As described above, since the gap is formed between the choke structure opening of the upper winding part or the inner surface of the choke structure opening of the electromagnetic wave absorber and the guide rail and the screen material, the screen material at the time of opening and closing the screen In the vertical movement, the screen material is not rubbed with the inner surface of the opening, and the screen material is not scratched by the rub.

  Further, by forming the gap, high-precision construction is unnecessary and construction is easy.

  Further, since there is no need for a conductive brush or the like that is provided on the inner surface of the opening and is brought into contact with the screen material elastically, there is no deterioration in electromagnetic shielding performance due to deterioration in elasticity due to fatigue.

  From the above, it is not necessary to replace the screen material and other components in a certain period.

  In the present invention, since the electromagnetic shield is a combination of a choke structure and a radio wave absorber, the shield frequency can be selected as appropriate, and electromagnetic waves other than the frequency required for the electromagnetic shield can be transmitted.

  In the present invention, a relatively wide band shielding performance can be ensured by combining a narrow band electromagnetic wave absorber in the same manner as a choke structure intended for a narrow band shield.

Next, an embodiment of the electromagnetic shield roll screen according to the present invention will be described with reference to FIGS.
FIG. 1 is a front view of an electromagnetic shield roll screen according to the present invention, and FIGS. 2 and 3 are sectional views taken along lines AA and BB in FIG. 1, respectively. 4 and 6 are enlarged views of the upper side and the lower side of FIG. 2, respectively, and FIG. 5 is an enlarged view of the left side of FIG.

  In the figure, reference numeral 1 denotes a screen material having electromagnetic shielding properties. In this screen material 1, an insulating protective layer 3 is formed on the surface of a thin conductive layer 2.

  Such a screen material 1 is formed, for example, on a film material such as polyethylene terephthalate (PET) with a conductive layer 2 made of a metal thin film such as ITO or silver to a thickness that can ensure daylighting properties by coating or sputtering. The protective layer 3 can be formed by applying an adhesive such as an epoxy resin adhesive, a silicone pressure-sensitive adhesive, or an acrylic adhesive to the surface.

  In addition, the screen material 1 is made of, for example, a metal foil such as a copper foil or an aluminum foil, a conductive fiber obtained by coating a metal on a metal fiber, a glass fiber or the like, or a normal screen material such as a chemical fiber such as polyester or acrylic. It can comprise as an electromagnetic shielding cloth material which woven into the cloth and formed the conductive layer. As yet another example, the screen material 1 is an electromagnetic shield fiber mesh in which a metal mesh material or a fiber coated with metal on the surface of an insulating fiber such as glass fiber is formed in a mesh shape to form a mesh-like conductive layer. Can be configured.

  The screen material 1 may have a conductive layer 2 on the surface or an insulating protective layer 3 on the surface of the conductive layer 2.

  Reference numeral 4 denotes an upper winding portion configured to wind the screen material 1 in a roll shape and to be able to enter and exit through an opening 5 provided on the lower side. The upper winding portion 4 winds the screen material 1. A take-up roll 6 to be taken and a metal roll cover 7 for storing the take-up roll 6 are configured. A well-known appropriate mechanism can be applied to the winding roll 6 and a mechanism for rotatably supporting the winding roll 6 and winding the screen material 1.

  Next, reference numerals 8a and 8b are metal guide rails that project downward from the upper winding portion 4 and guide both end edges of the screen material 1, and these guide rails 8a and 8b have openings 9a and 9b. It has a U-shaped configuration facing each other.

  Next, reference numeral 10 denotes a metal plate as a conductive grounding member that abuts the lower edge of the screen material 1, and this metal plate has a flat groove shape having an opening 11 at the top. As the ground member 10, for example, iron, stainless steel, aluminum, galvanized steel plate, or the like can be used.

  As described generally above, the electromagnetic shield roll screen of the present invention includes the screen material 1, the upper winding portion 4, the guide rails 8a and 8b, and the ground member 10 as constituent elements. A characteristic configuration will be described.

  First, as shown in FIG. 4, in the upper winding part 4, strip-shaped metal plates 12 a and 12 b are arranged in parallel on the opening 5 side of the metal roll cover 7, and the opening ends thereof are in a U-shape inside. The first choke structure C1 is formed by the U-shaped folded portions 13a and 13b. On the other hand, on the inner side of the first choke structure C1, strip-shaped metal plates 14a and 14b are juxtaposed on the opening side 5 of the metal roll cover 7, and their lower ends protrude in an L shape on the inner side. The L-shaped protrusions 15a and 15b form a second choke structure C2.

  Further, radio wave absorbers 16 (16a, 16b, 16c, 16d) are installed on the inner surfaces of the strip-shaped metal plates 13a, 13b and the inner surface of the metal roll cover 7.

  As shown in FIG. 4, a gap G is formed between the inner surface of the opening 5 ′ of the first choke structure C <b> 1 and the screen material 1. In other words, in this embodiment, the screen material 1 is formed by forming the insulating protective layer 3 on the surface of the thin conductive layer 2, so that the gap with respect to the electromagnetic wave is from the inner surface to the surface of the screen material 1. The sum of the gaps G1 and G2 and the thickness d of the protective layer 3, that is, the gap G1 + d on one side and the gap G2 + d on the other side.

  As shown in FIG. 5, in the guide rail 8a (8b), strip-shaped metal plates 17a and 17b are arranged in parallel on the opening side, and the opening ends are folded back in a U-shape on the inner side. A third choke structure C3 is formed by the U-shaped folded portions 18a and 18b. And the electromagnetic wave absorber 16 (16e, 16f, 16g) is installed on the inner surface side of the guide rail 8a (8b).

  As shown in FIGS. 3 and 5, a gap G is formed between the inner surface of the openings 9 a ′ and 9 b ′ of the third choke structure C <b> 3 and the screen material 1. That is, the gap with respect to the electromagnetic wave is the sum of the gap G3 from each inner surface to the surface of the screen material 1 and the thickness d of the protective layer 3, that is, G3 + d.

  Next, as shown in FIG. 6, in the grounding member 10, the upper opening 11 has a structure in which a surface of a relatively soft material such as rubber or urethane is wrapped with a metal mesh, or a relatively soft material such as rubber or urethane. A conductive shield gasket 19 in which metal fiber or metal powder is contained in the material to provide conductivity is installed.

  On the other hand, at the lower edge of the screen material 1, the screen material 1 is fixed by penetrating the screen material 1 with a metal screw 21, with the lower edge sandwiched between a pair of metal L angles 20a and 20b. The screen material 1 and the ground member 10 are brought into conduction by being brought into contact with the gasket 19. The L angle 20b is provided with a handle 22 for raising and lowering the screen material 1, and although not shown, the L angles 20a and 20b are held in contact with the shield gasket 19 at appropriate positions. A holding mechanism is provided.

  In the above configuration, in the present invention, the choke structure C (C1, C2, C3) is formed on the inner surface side of the opening 5 on the upper winding portion 4 side and the openings 9a, 9b of the guide rails 8a, 8b. Therefore, even if the gap G (G1, G2, G3) is formed between the inner surface of the opening of the choke structure C and the screen material, the electromagnetic shielding performance can be exhibited by the choke structure C.

  On the other hand, the screen material 1 is electrically connected to the ground member 10 through the metal L angles 20a and 20b and the shield gasket 19 at the lower edge thereof, so that the electromagnetic wave incident on the screen material 1 is grounded to the ground member 10. From this, leakage of electromagnetic waves from the outside to the room and from the room to the outside can be prevented.

  In this way, in the present invention, electromagnetic shielding is performed by the choke structure C and the radio wave absorber 16, so that even if a gap G (G 1, G 2, G 3) is formed between the inner surface of the opening of the choke structure C and the screen material 1, Shield performance can be demonstrated.

  For this reason, even when a highly daylighting screen material is used as the screen material 1 in which the conductive layer 2 is very thin in order to enhance the daylighting property and the insulating reinforcing layer 3 is formed on the surface thereof, a good electromagnetic property can be obtained. Shielding performance can be exhibited, and electromagnetic shielding can be reliably performed at places where it is necessary to maintain lighting such as windows.

  As described above, since the gap G is formed between the inner surface of the opening of the choke structure C and the screen material 1, the screen material 1 rubs against the inner surface of the opening when the screen material 1 moves up and down when the screen is opened and closed. Therefore, the screen material 1 is not scratched by rubbing.

  Also, by forming the gap G, high-precision construction is unnecessary and construction is easy.

  Also, unlike conventional electromagnetic shield roll screens, there is no need for a conductive brush or the like that is provided on the inner surface of the opening to make contact with the screen material elastically, resulting in deterioration of elasticity due to fatigue. There is no deterioration of the electromagnetic shielding performance.

  From the above, it is not necessary to replace the screen material and other components in a certain period.

  Thus, in the present invention, since the electromagnetic shield is the choke structure C, the dimensions of the choke structure C, for example, the widths W1, W2 and the depths D1, D1 of the grooves constituting the choke structures C1, C3 are adjusted. By setting these dimensions of the groove to be ¼ wavelength with respect to the electromagnetic wave having the required frequency of the electromagnetic shield, the shield frequency can be appropriately selected, and the frequency other than the required frequency of the electromagnetic shield. The electromagnetic wave can be transmitted.

  Further, in the present invention, in addition to the choke structure C, the radio wave absorber 16 (16a to 16g) is installed inside the opening 5 on the upper winding part 4 side and the openings 9a and 9b of the guide rails 8a and 8b. Therefore, electromagnetic waves that cannot be shielded only by the choke structure C can be effectively shielded. For example, although only a relatively narrow band electromagnetic wave can be shielded by the choke structure C, the electromagnetic wave absorber 16 (16a to 16g) can absorb electromagnetic waves of other frequencies to reduce leakage. In this case, the plurality of radio wave absorbers 16 (16a to 16b) may all have the same frequency to be shielded or may have different frequencies.

  As the radio wave absorber 16 (16a to 16b), for example, a plate or sheet formed by appropriately mixing a magnetic material and a dielectric with a base material such as rubber can be used.

  As described above, the present invention solves the above-mentioned problems of the conventional electromagnetic shield roll screen by rationally applying the choke structure and the radio wave absorber used in the microwave oven to the electromagnetic shield roll screen. The industrial applicability is great.

It is a front view of the electromagnetic shielding roll screen which concerns on this invention. It is the sectional view on the AA line of FIG. It is the BB sectional view taken on the line of FIG. FIG. 3 is an enlarged view of the upper side of FIG. 2. FIG. 4 is an enlarged view on the left side of FIG. 3. It is an enlarged view of the lower side of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Screen material 2 Conductive layer 3 Protective layer 4 Upper winding part 5, 5 'Opening part 6 Winding roll 7 Metal roll cover 8a, 8b Guide rail 9a, 9b Opening part 10 Grounding member 11 Opening part 12a, 12b Strip-shaped metal Plates 13a, 13b Band-shaped metal plates 14a, 14b Band-shaped metal plates 15a, 15b L-shaped protrusions 16 (16a-16g) Wave absorbers 17a, 17b Band-shaped metal plates 18a, 18b Folded portions 19 Shield gaskets 20a, 20b L angle 21 Metal Screw 22 Lifting handle

Claims (4)

A band-shaped metal plate hanging down on the opening side of the metal roll cover is juxtaposed, and the opening ends of the metal roll cover are folded inwardly to form a first choke structure. while to form a gap between the parts of the inner surface and the screen material, winding the screen material into a roll having an electromagnetic shielding property, and out allows configured through an opening provided in the lower side of the metal roll cover A conductive upper winding part, a conductive guide rail that projects downward from the upper winding part and guides both edges of the screen material, and a lower edge of the screen material are provided between the lower ends of the guide rail. And a conductive grounding member to be contacted, and a strip-shaped metal plate is arranged in parallel on the inner surface side of the opening portion of the guide rail, and the opening end thereof is folded back to form a third choke structure. Features and Electromagnetic shield roll screen that. 2. The second choke structure is formed by arranging the strip metal plates in parallel on the inner surface above the first choke structure of the hanging strip metal plate and bending the lower ends thereof inward. Electromagnetic shielding roll screen. The electromagnetic shield roll screen according to claim 1 or 2, wherein a radio wave absorber is installed inside the opening. The electromagnetic shielding roll screen according to any one of claims 1 to 3, wherein the screen material is a highly daylighting screen material in which a transparent protective layer is formed on the surface of a thin conductive layer.

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