JP2007201094A - Electromagnetic wave shielding box - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To ensure a predetermined electromagnetic wave shielding performance, to readily transport or transfer an electromagnetic wave shielding box, and to prevent reduction of the electromagnetic wave shielding performance, even if the interior generates heat. <P>SOLUTION: A plurality of struts 12, having a electrical conductivity are erected at a predetermined interval at a fringe of a lower member 11 having conductivity, and an upper member 13 having a conductivity is connected to upper ends of the plurality of struts to form a ceiling. A door 14 and a side plate 16, having conductivity clog an opening for a door 17 and a side opening 18, respectively, and the door and the side plate are fitted detachably to the strut, etc. A shielding member for a door 21, which has conductivity and heat resistance and is formed with an elastically deformable band-shaped unwoven fabric, is interposed between the entire fringe of the door and the strut, etc. opposite to the entire fringe of the door. A shielding member for a side plate 23, formed into a band shape with the same material as the shielding member for the door, is interposed between the entire fringe of the side plate and the strut, etc. opposite to the entire fringe of the side plate. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a box for shielding electromagnetic waves. More specifically, it is used to prevent electromagnetic waves that adversely affect electronic devices such as server computers housed therein from entering or to prevent leakage of electromagnetic waves generated by electronic devices such as server computers. The present invention relates to an electromagnetic shielding box.

Conventionally, an opening is provided on the front and back of the upper body made of metal such as steel, an opening is provided on the front of the lower body made of metal such as steel, and the opening on the front of the upper body is made of metal. A server rack is disclosed that is closed by a front door, a rear opening of the upper body is closed by a metal back door, and an opening of the lower body is closed by a metal lower front door. (For example, refer to Patent Document 1). In this server rack, shield fingers are arranged along the periphery of each opening of the upper body, and shield fingers are arranged along the periphery of the opening of the lower body. The space inside the upper body and the space inside the lower body are electromagnetically cut off from the outside by the shield fingers. The wall thickness of the upper body is set to 40 mm at the bent portion and 21 mm at the other portions. Moreover, the thickness of a front door and a back door is each set to 21 mm. The thickness of each member is set to the above thickness in order to protect the internal server by blocking strong electromagnetic waves. Furthermore, a plurality of plate members may be produced by welding without forming the upper body and the lower body integrally. However, if the upper main body and the lower main body are manufactured using spot welding or rivets, respectively, the shielding effect cannot be exhibited as the frequency of electromagnetic waves increases. Therefore, it is desirable to manufacture using the stainless shield welding method. In addition, it is preferable to use a stainless shield welding method instead of spot welding or rivets for the connection between the upper body and the lower body.
Japanese Patent Application Laid-Open No. 2002-341962 (Claim 1, paragraph [0010], paragraph [0021], FIG. 1, FIG. 4, FIG. 7)

However, in the server rack shown in Patent Document 1 above, the upper main body and the lower main body are made by connecting steel plate members by a stainless steel shield welding method, and the upper main body and the lower main body are also joined by the stainless steel shield. Since it is performed by the welding method, the man-hours for manufacturing the upper main body and the lower main body increase, and the server rack cannot be disassembled when the server rack is carried in or moved. Therefore, a very large number of work steps are required for carrying in or moving the server rack. There was a problem that needed.
Moreover, in the server rack shown in the above-mentioned conventional Patent Document 1, shield fingers are arranged along the periphery of each opening of the upper body, and shield fingers are arranged along the periphery of the opening of the lower body. The specific configuration of these shield fingers is not described. When rubber conductive gaskets are used as these shield fingers, the gasket deteriorates due to the heat generated by the server housed in the rack, and there is a problem that the electromagnetic wave shielding performance gradually decreases. When foil is used, the thickness is thin and there is no elasticity, so a gap is generated between the opening of the upper body or the lower body and the door, and the predetermined electromagnetic shielding performance cannot be secured. Even if there is no gap between the opening of the lower body and the door, the aluminum foil is easily damaged due to repeated opening and closing of the door, so that there is a problem that the shielding performance of electromagnetic waves is lowered.
The first object of the present invention is to secure a predetermined electromagnetic shielding performance and to carry in even if a side plate, a door or the like is detachably attached to a column or the like, or a column is detachably attached to a lower member and an upper member. An object of the present invention is to provide an electromagnetic shielding box capable of performing work and relocation work relatively easily.
The second object of the present invention is to provide an electromagnetic wave shielding box in which even if an electronic device such as a server computer housed therein generates heat, the shield member for doors and the like is not deteriorated by heat and the electromagnetic wave shielding performance can be prevented from being lowered. Is to provide.
A third object of the present invention is to provide an electromagnetic wave shielding box in which the electromagnetic wave shielding performance does not deteriorate even if it is disassembled and reassembled for transfer after being carried in and assembled.

As shown in FIG. 1, the invention according to claim 1 is erected with a predetermined interval between the lower member 11 having conductivity and forming a floor, and the periphery of the lower member 11 having conductivity. For the door among the plurality of columns 12, the upper member 13 having conductivity and connecting the upper ends of the columns 12 to form the ceiling, and the openings 17 and 18 between the plurality of columns 12 having conductivity This is an improvement of the electromagnetic wave shielding box including the door 14 that covers the opening 17 so as to be openable, and the side plate 16 that has conductivity and closes the opening 18 between the plurality of columns 12 excluding the door opening 17.
The characteristic structure is that the door 14 is detachably attached to one or two or more types selected from the group consisting of the lower member 11, the support column 12 and the upper member 13, and the side plate 16 is attached to the lower member 11, the support column 12 and the upper member. The door shield member 21 formed of a strip-like nonwoven fabric that is detachably attached to the member 13 and has conductivity, heat resistance, and elastic deformation is opposed to the entire periphery of the door 14 and the entire periphery of the door 14. The side plate shield member 23 interposed between the lower member 11, the support column 12, and the upper member 13, which is formed of a belt-like nonwoven fabric having conductivity and heat resistance and elastically deformable, has an entire periphery of the side plate 16. And the lower plate 11, the support column 12, and the upper member 13 that are opposed to the entire periphery of the side plate 16.
In the electromagnetic wave shield box according to the first aspect, when the shield box 10 is carried in, the door 14 and the side plate 16 are transported in a state of being detached from the column 12 and the like. Further, when the door 14 is assembled to the column 12 or the like and the door 14 is closed, the gap between the door 14 periphery and the column 12 or the like is closed by the elastic deformation of the door shield member 21, and the side plate 16 is attached to the column 12 or the like. When assembled, the gap between the peripheral edge of the side plate 16 and the column 12 is closed by elastic deformation of the side plate shield member 23. Further, when an electronic device such as a server computer is accommodated in the shield box 10 and the electronic device is operated, the heat in the shield box 10 becomes high due to the heat generated by the electronic device. Since the shield member 23 has heat resistance, the shield members 21 and 23 are not deteriorated by heat. On the other hand, when the carried-in shield box 10 is disassembled for transfer, the door shield member 21 compressed by being sandwiched between the door 14 and the column 12 is restored, and is compressed by being sandwiched between the side plate 16 and the column 12. Since the shield member 23 for the side plate that has been restored is restored, when the shield box 10 is assembled again, the gap between the peripheral edge of the door 14 and the column 12 and the like is reliably closed by the elastic deformation of the door shield member 21. A gap between the peripheral edge of the side plate 16 and the column 12 and the like is reliably closed by elastic deformation of the side plate shield member 23.

The invention according to claim 2 is the invention according to claim 1, and further, as shown in FIG. 1, the support column 12 is detachably attached to the lower member 11 and the upper member 13, and has conductivity and heat resistance. In addition, a lower shield member 26 for struts formed of an elastically deformable belt-shaped nonwoven fabric is interposed between the lower end portion of the struts 12 and the lower member 11 facing the lower end portion of the struts 12, and is electrically conductive and heat resistant. The support upper shield member 28 formed of a belt-like nonwoven fabric having elasticity and elastically deformable is interposed between the upper end portion of the support column 12 and the upper member 13 facing the upper end portion of the support column 12. It is characterized by.
In the electromagnetic wave shield box according to the second aspect, when the shield box 10 is carried in, the door 14 and the side plate 16 are removed from the support column 12 and the like, and the support column 12 is transported in a state of being removed from the lower member 11 and the upper member 13. Further, when the lower end portion of the support column 12 is assembled to the lower member 11, the gap between the lower end portion of the support column 12 and the lower member 11 is closed by elastic deformation of the support lower shield member 26, and the upper end portion of the support column 12 is closed. When assembled to the upper member 13, the gap between the upper end portion of the column 12 and the upper member 13 is closed by elastic deformation of the column upper shield member 28. When the door 14 is assembled to the column 12 and the door 14 is closed, the gap between the periphery of the door 14 and the column 12 is closed by the elastic deformation of the door shield member 21, and the side plate 16 is assembled to the column 12 and the like. When attached, the gap between the peripheral edge of the side plate 16 and the column 12 is closed by elastic deformation of the side plate shield member 23. Further, when the electronic device is accommodated in the shield box 10 and the electronic device is operated, the heat in the shield box 10 is raised by the heat generated by the electronic device. However, the lower shield member 26 for the column and the upper shield member for the column 28. Since the door shield member 21 and the side plate shield member 23 have heat resistance, the shield members are not deteriorated by heat. On the other hand, if it is carried in and disassembled for assembly after the shield box 10 is assembled, the shield members 26, 28, 21, 23 are restored. For this reason, when the shield box 10 is assembled again, the gap between the lower end portion of the support column 12 and the lower member 11 is reliably closed by elastic deformation of the support lower shield member 26, and the upper end portion of the support column 12 and the upper member 13. The gap between the door 14 and the support 12 is reliably closed by the elastic deformation of the door shield member 21. Further, the gap between the peripheral edge of the side plate 16 and the column 12 and the like is reliably closed by elastic deformation of the side plate shield member 23.

The invention according to claim 5 is the invention according to claim 1, and further, as shown in FIG. 3, the lower shield member 21 is configured such that the door shield member 21 faces the entire periphery of the door 14 or the entire periphery of the door 14. The side plate shield member 23 is bonded to the entire periphery of the side plate 16 or the entire periphery of the side plate 16 with the adhesive 24 to the support column 12 and the upper member 13. It is characterized by being bonded.
In the electromagnetic wave shielding box according to the fifth aspect, the door shield member 21 is bonded to the entire periphery of the door 14 or the column 12 facing the entire periphery of the door 14 with an adhesive, and the side plate shield member 23 is attached. Since the adhesive 24 is adhered to the entire periphery of the side plate 16 or the support column 12 facing the entire periphery of the side plate 16, it is not necessary to align the door shield member 21 and the side plate shield member when the shield box 10 is assembled. .
The invention according to claim 6 is the invention according to claim 2, and as shown in FIGS. 5 and 7, the support lower shield member 26 faces the lower end of the support 12 or the lower end of the support 12. It is characterized in that the lower shield member 11 is bonded to the lower member 11 with an adhesive 27 and the upper shield member 28 for the column is bonded to the upper end of the column 12 or the upper member 13 opposite to the upper end of the column 21 with the adhesive 29.
In the electromagnetic wave shielding box according to claim 6, the lower shield member 26 for the column is bonded to the lower end portion of the column 12 or the lower member 11 facing the lower end portion of the column 12 with the adhesive 27, and the upper shield for the column. Since the member 28 is bonded to the upper end of the support column 12 or the upper member 13 facing the upper end of the support column 12 with the adhesive 29, the alignment of the lower shield member 26 for the support column and the upper shield member 28 for the support column when the shield box 10 is assembled. Is no longer necessary.

The invention according to claim 7 is the invention according to claim 5 or 6, wherein the adhesives 24, 27, and 29 are formed in a sheet shape having a mesh as shown in FIGS. It is a hot melt type adhesive.
In the electromagnetic wave shielding box described in claim 7, even if the adhesives 24, 27, 29 themselves do not have conductivity, the door 14 and the door shielding member 21 are in direct contact through the mesh of the adhesive, The side plate 16 and the side plate shield member 23 are in direct contact with each other through the mesh of the adhesive 24, the column 12 and the lower shield member 26 for column are in direct contact through the mesh of the adhesive 27, and the column 12 is further passed through the mesh of the adhesive 29. And the upper shield member 28 for struts are in direct contact.

The invention according to claim 8 is the invention according to claim 5 or 6, wherein the adhesive is a hot-melt adhesive having conductivity.
In the electromagnetic wave shielding box described in claim 8, since the adhesive itself has conductivity, the door and the door shield member are electrically connected through the adhesive, and the side plate and the side plate shield member are adhesive. The support and the lower shield member for the support are electrically connected through the adhesive, and the support and the upper shield member for the support are electrically connected through the adhesive.

  As described above, according to the present invention, the door and the side plate are detachably attached to the columns and the like, and the door shield member formed of a strip-shaped nonwoven fabric having conductivity and heat resistance and elastically deformable is provided. The side plate shield member, which is interposed between the entire peripheral edge of the door and the pillars facing the entire peripheral edge of the door, and formed into a strip shape by the same material as the door shield member, is connected to the entire peripheral edge of the side plate and the side plate. Because it is interposed between the pillars facing the entire periphery, etc., when the shield box is carried in or moved, the heavy shield box is not carried at a time by carrying the door and side plate removed from the pillar etc. It will end. As a result, the shield box can be carried in and moved relatively easily. In addition, the gap between these members is closed by elastic deformation of the door shield member due to the assembly of the door to the pillar and the door closing, and the gap between these members is caused by the attachment of the side plate to the pillar. Is blocked by the elastic deformation of the shield member for the side plate, so that the predetermined electromagnetic wave shielding performance of the shield box can be ensured. Also, although the inside of the shield box becomes hot due to the heat generated by the operation of the electronic equipment housed in the shield box, the door shield member and the side plate shield member have heat resistance, so these shield members deteriorate due to heat. Without degrading the electromagnetic wave shielding performance. Also, if the shield box is disassembled to move it, the door shield member and side plate shield member will be restored, so if the shield box is reassembled at the transfer destination, there will be a gap between the door edge and the column etc. Since it is reliably blocked by elastic deformation of the door shield member or the like, the electromagnetic shielding performance of the shield box does not deteriorate.

  Also, the support pillar is detachably attached to the lower member and the upper member, and the support lower shield member formed of a strip-shaped nonwoven fabric having conductivity and heat resistance and elastically deformable is connected to the lower end portion of the support post and the lower end portion of the support post. Between the upper member of the column and the upper member facing the upper end of the column. The upper shield member for the column formed of the same material as that of the column lower shield member is interposed between the upper member and the upper member of the column. If it is installed, when the shield box is carried in or moved, the door and side plate are removed from the column, etc., and the column is transported with the column removed from the lower member and upper member. You do n’t have to. As a result, it is possible to carry in and move the shield box relatively easily. Also, by assembling the lower end of the support column to the lower member, the gap between these members is closed by the elastic deformation of the lower shield member for the support column, and by attaching the upper end of the support column to the upper member, these members The gap between the members is closed by elastic deformation of the upper shield member for the pillar, and the gap between these members is closed by elastic deformation of the shield member for the door and the like by assembling the door to the pillar and the like and closing the door. Therefore, the predetermined electromagnetic shielding performance of the shield box can be ensured. Also, although heat is generated in the shield box due to the heat generated by the electronic equipment housed in the shield box, the support lower shield member has heat resistance, so these shield members are not deteriorated, and electromagnetic shielding performance Can be prevented. Also, if the shield box is disassembled to relocate, the door shield members and the like will be restored, so when the shield box is reassembled at the relocation destination, the gap between the lower end of the strut and the lower member will become a lower shield for the strut Since it is reliably closed by elastic deformation of the member or the like, the electromagnetic shielding performance of the shield box does not deteriorate.

In addition, the door shield member is adhered to the entire periphery of the door or the column that opposes the entire periphery of the door with an adhesive, and the side plate shield member is adhered to the entire periphery of the side plate or the column that opposes the entire periphery of the side plate. If the adhesive is used, it is not necessary to align the shield member for the door and the shield member for the side plate, so that the work of assembling the door and the side plate to the column can be improved.
Further, the lower shield member for the column is bonded to the lower end portion of the column or the lower member facing the lower end portion of the column with an adhesive, and the upper shield member for the column is bonded to the upper end portion of the column or the upper end portion of the column. If it adhere | attaches with an adhesive agent, since the alignment of the lower shield member for pillars and the upper shield member for pillars becomes unnecessary, the assembly workability | operativity to the lower member and upper member of a pillar can be improved.
In addition, if the adhesive is a hot melt type adhesive formed in a sheet shape having a mesh, even if the adhesive itself does not have conductivity, the door, etc. and the door shield member, etc. pass through the adhesive mesh. Since direct contact is made, electrical continuity between the door or the like and the door shield member or the like can be ensured. As a result, it is possible to prevent deterioration of the electromagnetic shielding performance of the shield box.
Furthermore, if the adhesive is a hot-melt adhesive having conductivity, the door and the door shield member and the like are electrically connected through the adhesive, so that the electromagnetic shielding performance of the shield box can be prevented from deteriorating.

Next, the best mode for carrying out the present invention will be described with reference to the drawings.
As shown in FIGS. 1, 9 and 10, the electromagnetic wave shielding box 10 is composed of a single lower member 11 having conductivity and forming a floor, and a predetermined interval on the periphery of the lower member 11 having conductivity. 4 columns 12 standing upright, a single upper member 13 having conductivity and forming a ceiling by connecting the upper ends of the plurality of columns 12, and 4 columns having conductivity The door 14 which covers the door opening 17 between the columns 12 so as to be openable, and the side plate 16 which has conductivity and blocks the side plate opening 18 between the columns. The lower member 11 is a flat rectangular parallelepiped box formed by pressing a stainless steel plate (thickness 0.8 to 3.0 mm) such as SUS430, SUS304, or SUS316 that does not rust even if it is not subjected to surface treatment such as plating. (FIGS. 1, 5 and 6). The lower member 11 includes a rectangular floor portion 11a, a lower side portion 11b that is provided continuously on the entire periphery of the floor portion 11a and extends downward, and an inner periphery provided on the entire lower edge of the lower side portion 11b. And a lower flange (not shown). In this lower member 11, continuous welding without a gap is applied to a portion where the stainless steel plate is bent and then butted and welded to prevent deterioration in electromagnetic shielding performance. The four corners of the lower member 11 are formed with a lower notch 11d from which the lower side 11b and the lower flange are removed, and the lower notch 11d is formed by bending an angle material into a substantially L shape. The lower corner connecting portion 11f is welded so as to close the lower notch portion 11d from the inside of the lower member 11 (FIGS. 5 and 6). As a method for welding these lower corner connecting portions 11f, continuous welding is performed on a joint portion that affects the electromagnetic shielding performance, and spot welding is performed on a joint portion that does not affect the electromagnetic shielding performance. Further, a lower end portion of the support column 12 is accommodated in a substantially L-shaped lower recess portion 11g formed by both side edges of the lower notch portion 11d and the surface of the lower corner connecting portion 11f. The edge is attached to the lower corner connecting part 11f with a countersunk screw (not shown) in a state in which the edge is in close contact with both side edges of the lower notch part 11d. The thickness of the lower side portion 11b is such that when the lower end of the support column 12 is attached to the lower corner connecting portion 11f of the lower member 11 via a support lower shield member 26 described later, the outer surface of the support column 12 is lower side portion. The thickness is set to be substantially the same as the outer surface of 11b. Thus, when the lower end portion of the support column 12 is attached to the corner portion of the lower member 11, there is almost no step between the outer surface of the support column 12 and the outer surface of the lower side portion 11b.

  The upper member 13 is configured in substantially the same manner as the lower member 11. That is, the upper member 13 is connected to the rectangular ceiling portion 13a, the upper side portion 13b that extends continuously downward from the entire periphery of the ceiling portion 13a, and the entire lower edge of the upper side portion 13b. And an upper flange 13c extending in the direction (FIGS. 1, 4, 7, and 8). Further, four corner portions of the inner surface of the upper side portion 13b of the upper member 13 are formed with upper notch portions 13d from which the upper side portion 13b and the upper flange 13c are removed at the four corner portions of the upper member 13. The upper corner connecting portion 13f formed by bending the angle material into a substantially L shape is welded to the upper notch portion 13d so as to close the upper notch portion 13d from the inside of the upper member 13 (FIGS. 7 and 7). 8). As a method for welding these upper corner connecting portions 13f, continuous welding is performed on the joint portion that affects the electromagnetic shielding performance, and spot welding is performed on the joint portion that does not affect the electromagnetic shielding performance. The upper end of the column 12 is accommodated in a substantially L-shaped upper recess 13g formed by both side edges of the upper notch 13d and the surface of the upper corner connecting portion 13f. It is attached to the upper corner connecting portion 13f with a countersunk screw (not shown) in a state where the edges are in close contact with both side edges of the upper notch 13d. The thickness of the upper side portion 13b is such that when the upper end portion of the column 12 is attached to the upper corner connecting portion 13f of the upper member 13 via the column upper shield member 28 described later, the outer surface of the column 12 is the upper side portion. The thickness is set to be substantially the same as the outer surface of 13b. As a result, when the upper end portion of the column 12 is attached to the corner portion of the upper member 13, there is almost no step between the outer surface of the column 12 and the outer surface of the upper side portion 13 b.

  On the other hand, the support column 12 is pressed by a stainless steel plate (thickness 0.8 to 3.0 mm) such as SUS430, SUS304, or SUS316 that does not rust even if it is not subjected to surface treatment such as plating, or the above stainless steel is drawn. Thus, the cross section is formed so as to be substantially L-shaped. The strut 12 is formed with a pair of flanges 12a extending in the longitudinal direction of the strut 12 by bending both side edges into a substantially U shape inward (FIGS. 2, 6, and 8). Further, the flange 12a at the lower end and the flange 12a at the upper end of the column 12 are removed by the height of the lower member 11 and the upper member 13, respectively (FIGS. 6 and 8). As a result, the lower end portion of the support column 12 is accommodated in the corner portion of the lower side portion 11b of the lower member 11 where the second lower reinforcing plate 11d is not welded, and the upper end portion of the support column 12 is the upper side portion of the upper member 13. It is comprised so that the 2nd upper reinforcement board 13d may be accommodated in the corner part which is not welded among 13b. Further, the lower end and the upper end of the column 12 are removably attached to the lower member 11 and the upper member 13 by screws or screws and nuts (not shown). It is to be noted that a countersunk screw is used as a screw so that the head of the screw does not protrude from the outer surface of the column when the lower member 11 and the upper member 13 at the lower and upper ends of the column 12 are attached to the outer surface of the corner. preferable.

  Two door openings 17 are provided opposite to each other, and these door openings 17 are closed by a pair of doors 14 so as to be openable. Since the pair of doors 14 are configured substantially the same, only one door 14 on the front side will be described, and description of the other door on the back side will be omitted. The door 14 is substantially the same as the door opening 17 by pressing a stainless steel plate (thickness 0.8 to 3.0 mm) such as SUS430, SUS304, or SUS316 that does not rust even if it is not subjected to surface treatment such as plating. It is formed in a rectangular shape, and on the surface of the door 14, a plurality of small holes 14a having a diameter of 3 to 5 mm are arranged at predetermined intervals to form a peephole that allows the inside to be visually recognized (FIG. 1). The door 14 is detachably attached to the support column 12 by a hinge (not shown). Reference numeral 14 b in FIGS. 1 and 2 is a handle of the door 14. The door may be detachably attached to the lower member and the upper member instead of the support column, or may be detachably attached to the lower member, the support column and the upper member. On the other hand, two side plate openings 18 are provided opposite to each other, and these side plate openings 18 are closed by a pair of side plates 16 so as to be openable. Since the pair of side plates 16 are configured substantially identical to each other, only one side plate 16 will be described, and description of the other side plate 16 will be omitted. The side plate 16 is substantially the same as the side plate opening 18 by pressing a stainless steel plate (thickness 0.8 to 3.0 mm) such as SUS430, SUS304, SUS316, etc. that does not rust without being subjected to surface treatment such as plating. It is formed in a rectangular shape. The side plate 16 is formed with a rectangular frame-shaped flange 16a by bending the peripheral edge inward into a substantially U shape. Further, in this side plate 16, continuous welding without a gap is performed on a portion where the stainless steel plate is bent and then butt-welded to prevent deterioration of electromagnetic shielding performance. The flange 16a protrudes at a predetermined interval and is formed with a tap hole 16b (FIG. 2). The protruding tap hole 16b is a hole that becomes a female screw when the tapping screw 19 is forcibly screwed. Through holes 12b through which the tapping screws 19 can be inserted are formed in the lower side portion 11b of the lower member 11, the support column 12, and the upper side portion 13b of the upper member 13 facing the protruding tap holes 16b. The side plate 16 is detachably attached to the column 12 and the like by these tapping screws 19.

  A door shield member 21 is interposed between the entire periphery of the door 14 and the lower member 11, the support column 12, and the upper member 13 facing the entire periphery of the door 14 (FIGS. 1 and 2). The door shield member 21 is formed in a square frame shape by a strip-shaped nonwoven fabric having conductivity and heat resistance and elastically deformable. This door shield member 21 is made of non-woven resin fibers having a thickness of 0.1 to 15 d (denier) coated with a metal such as nickel or copper, and the width of each side is 10 to 50 mm, preferably 10 to 25 mm. The thickness is 0.5 to 6 mm, preferably 1 to 3 mm. The door shield member 21 is formed to withstand heat of 150 to 200 ° C., that is, to have heat resistance. Here, the width of each side of the door shield member 21 is limited to a range of 10 to 50 mm. If the width is less than 10 mm, the door shield member 21 completely closes the gap between the door 14 and the column 12. This is because the electromagnetic wave shielding performance is hardly improved even if the width exceeds 50 mm. The reason why the thickness of the door shield member 21 is limited to the range of 0.5 to 6 mm is that the gap between the door 14 and the column 12 is completely closed by the door shield member 21 when the thickness is less than 0.5 mm. This is because even if the thickness exceeds 6 mm, the electromagnetic wave shielding performance is hardly improved. Furthermore, since the door shield member 21 has extremely high heat resistance capable of withstanding a temperature of 150 to 200 ° C., even if the electronic equipment in the shield box 10 generates heat, the ambient temperature in the shield box 10 is the same as that for the door. The temperature is about 10 to 30 ° C., which is much lower than the heat resistance of the shield member, and the door shield member is not deteriorated even if exposed to this atmosphere. The door shield member 21 is bonded to the door 14 with an adhesive (not shown). This adhesive is a hot melt adhesive formed in a sheet shape having a mesh. In this case, even if the adhesive itself does not have conductivity, the door 14 and the door shield member 21 are in direct contact with each other through the adhesive mesh, so that electrical conduction between the door 14 and the door shield member 21 is achieved. The electromagnetic wave shielding performance of the electromagnetic wave shielding box 10 can be prevented from being lowered. Further, between the entire peripheral edge of the side plate 16 and the lower member 11, the support column 12 and the upper member 13 facing the entire peripheral edge of the side plate 16, that is, between the flange 16a of the side plate 16 and the support column 12 facing the flange 16a. A side plate shield member 2 is interposed therebetween (FIGS. 1 to 4). The side plate shield member 23 is formed of the same material as the door shield member 21 and is bonded to the flange 16a of the side plate 16 with the same adhesive 24 as the door shield member 21 (FIG. 3). In addition, the shield member for doors and the shield member for side plates are not formed in a square frame shape in advance, but a rectangular frame shape is formed by adhering a belt-like door shield member and a shield member for side plates to the entire periphery of the door and the side plate. You may form in.

  On the other hand, a lower shield member 26 for support is interposed between the lower end of the support 12 and the lower member 11 facing the lower end of the support 12 (FIGS. 5 and 6). The support lower shield member 26 is formed in a rectangular frame shape using a nonwoven fabric of the same material and thickness as the door shield member 21, and is bonded to the corner portion of the lower member 11 with the same adhesive 27 as the adhesive 24. Is done. The width of each side of the support lower shield member 26 is 10 to 50 mm, preferably 10 to 25 mm. Here, the width of each side of the support lower shield member 26 is limited to a range of 10 to 50 mm. If the width is less than 10 mm, the gap between the lower end portion of the support 12 and the lower member 11 is defined as the support lower shield member 26. This is because the electromagnetic wave shielding performance is hardly improved even if the width exceeds 50 mm and the width is wide. Further, a support upper shield member 28 is interposed between the upper end portion of the support column 12 and the upper member 13 facing the upper end portion of the support column 12 (FIGS. 7 and 8). The support upper shield member 28 is formed in a square frame shape using the same non-woven fabric as the support lower shield member 26, and is bonded to the corner portion of the upper member 13 with the same adhesive 29 as the adhesive 27. The lower shield member and the upper shield member are not formed in a square frame shape in advance, but the belt-like lower shield member and the upper shield member are arranged at the corner portion of the lower member and the corner portion of the upper member. You may form in a square frame shape by adhere | attaching. 1 is a lower square hole formed in the lower member 11, and the lower square hole 11e is closed by a lower closing plate 31 made of a stainless steel plate. A plurality of vent holes 31a having a diameter of 3 to 5 mm are formed in the lower closing plate 31, and a short tube 32 through which a power cord of an electronic device such as a server computer passes is fixed by screwing or welding. The short tube 32 is filled with a non-woven fabric having conductivity in order to ensure a predetermined electromagnetic shielding performance. A shield member 33 having the same material and thickness as the door shield member 21 is interposed between the periphery of the lower square hole 11e and the lower closing plate 31. On the other hand, reference numeral 13e in FIG. 1 is an upper rectangular hole formed in the upper member 13, and the upper rectangular hole 13e is closed by an upper closing plate 36 made of a stainless steel plate. The upper closing plate 36 is formed with a plurality of vent holes 36a having a diameter of 3 to 5 mm. The same material and the same thickness as the door shield member 21 are provided between the periphery of the upper square hole 13e and the upper closing plate 36. A shield member 37 is interposed. Further, reference numeral 38 in FIG. 2 is a shelf holder for receiving a shelf on which an electronic device is placed. The shelf holder 38 is removably attached to the column 12 by a tapping screw 39.

  In the electromagnetic wave shielding box 10 configured as described above, when the shield box 10 is carried in, the door 14 and the side plate 16 are removed from the lower member 11, the column 12 and the upper member 13, and the column 12 is removed from the lower member 11 and the upper member 13. Transport in the removed state. As a result, it is not necessary to transport the entire large and heavy shield box 10 at a time, so that the shield box 10 can be carried in relatively easily. When the shield box 10 is carried into the installation place and the lower end of the support column 12 is assembled to the lower member 11, the gap between the lower end of the support column 12 and the lower member 11 is blocked by the elastic deformation of the support lower shield member 26. When the upper end of the column 12 is assembled to the upper member 13, the gap between the upper end of the column 12 and the upper member 13 is closed by elastic deformation of the column upper shield member 28. Further, when the door 14 is assembled to the support column 12 and the door is closed, the gap between the periphery of the door 14 and the support column 12 is closed by elastic deformation of the door shield member 21, and the side plate 16 is connected to the lower member 11 and the support column 12. When assembled to the upper member 13, the gap between the peripheral edge of the side plate 16 and the column 12 is closed by elastic deformation of the side plate shield member 23. As a result, since the gaps are eliminated, a predetermined electromagnetic shielding performance of the shield box 10 can be ensured. The support lower shield member 26 is bonded to the lower member 11 and the support upper shield member 28 is bonded to the upper member 13 in advance, so that the alignment of the shield members 26 and 28 becomes unnecessary. Assembling work to the 12 lower members 11 and the upper member 13 can be improved. Further, since the door shield member 21 is bonded in advance to the door 14 and the side plate shield member 23 is bonded to the side plate 16, it is not necessary to align the shield members 21 and 23. Assembling work to the column 12 can be improved.

  When an electronic device such as a server computer is accommodated in the shield box 10 assembled in this way and this electronic device is operated, the heat in the shield box 10 becomes high due to the heat generated by the electronic device. Since the member 26, the upper column shield member 28, the door shield member 21, and the side plate shield member 23 have heat resistance, the shield members are not deteriorated, and the electromagnetic wave shielding performance can be prevented from being lowered. Further, when the shield box 10 is loaded and assembled and then disassembled for transfer, the shield members 26, 28, 21, and 23 are restored. When the shield box 10 is assembled again at the transfer destination, the gap between the lower end of the support column 12 and the lower member 11 is reliably closed by the elastic deformation of the support lower shield member 26, and the upper end of the support column 12 and the upper member 13. Is reliably closed by elastic deformation of the support upper shield member 28. Further, the gap between the periphery of the door 14 and the column 12 and the like is reliably closed by the elastic deformation of the door shield member 21, and the gap between the periphery of the side plate 16 and the column 12 and the like is elastically deformed of the side plate shield member 23. Is surely blocked. As a result, the electromagnetic shielding performance of the shield box 10 does not deteriorate.

In this embodiment, the door shield member is bonded to the entire periphery of the door with an adhesive, and the side plate shield member is bonded to the entire periphery of the side plate with an adhesive, but the door shield member is bonded to the entire periphery of the door. The side plate shield member may be bonded to a column or the like opposing the entire periphery of the side plate with an adhesive.
Further, in this embodiment, the lower shield member for the column is bonded to the lower member facing the lower end of the column with an adhesive, and the upper shield member for the column is bonded to the upper member facing the upper end of the column with the adhesive. The support lower shield member may be bonded to the lower end of the support with an adhesive, and the support upper shield member may be bonded to the upper end of the support with an adhesive.
In this embodiment, a hot-melt adhesive formed in a sheet shape having a mesh is used as the adhesive, but a hot-melt adhesive having electrical conductivity may be used. Examples of the hot-melt adhesive having conductivity include an adhesive in which a conductive filler made of conductive powder such as nickel, conductive carbon black, copper, and silver is mixed. In this case, the door and the door shield member are electrically connected through the adhesive, the side plate and the side plate shield member are electrically connected through the adhesive, and the column and the column lower shield member are electrically connected through the adhesive. In addition, since the support and the support upper shield member are electrically connected through the adhesive, it is possible to prevent the electromagnetic shielding performance of the shield box from being deteriorated.
Further, a radio wave absorber formed by impregnating a urethane foam with carbon, or a radio wave absorber formed of sintered ferrite in a flat tile shape may be attached to the inner surface of the door or the side plate. Thereby, electromagnetic wave shielding performance can be further improved.

Next, embodiments of the present invention will be described in detail.
<Example 1>
As shown in FIGS. 1, 9 and 10, the lower member 11 formed of a 2.0 mm thick SUS430 plate and the four support columns formed of a 1.5 mm thick SUS430 plate. 12, an upper member 13 formed of a 2.0 mm thick SUS430 plate, a pair of doors 14 formed of a 1.0 mm thick SUS430 plate, and a 1.0 mm thick SUS430 made plate Using the pair of side plates 16 formed of the above plate, the electromagnetic shielding box 10 having a length of 998 mm, a height of 698 mm, and a height of 698 mm was produced. A door shield member 21 having a side width of 25 mm and a thickness of 1.5 mm is interposed between the entire peripheral edge of the door 14 and the column 12 facing the entire peripheral edge of the door 14 ( 1 and 2), the side plate shield member 23 having a side width of 25 mm and a thickness of 1.5 mm is provided between the flange 16a of the side plate 16 and the support column 12 facing the flange 16a. It was interposed (FIGS. 1 to 4). Furthermore, a lower shield member 26 for struts having a side width of 25 mm and a thickness of 1.5 mm is provided between a lower end portion of the strut 12 and a corner portion of the lower member 11 facing the lower end portion of the strut 12. (FIGS. 5 and 6), and the support upper shield member 28 having a side width of 25 mm and a thickness of 1.5 mm is attached to the upper end of the support 12 and the upper end of the support 12. It interposed between the corner parts of the upper member 13 which opposes (FIG.7 and FIG.8). On the other hand, a ventilation hole 31a formed in the lower closing plate 31 for closing the square hole 11e of the lower member 11, a ventilation hole 36a formed in the upper closing plate 36 for closing the square hole 13e of the upper member 13, and a pair of The small holes 14a formed in the door 14 have a honeycomb structure with a hole diameter of 4 mm and a height of 12.7 mm (FIGS. 1 and 10). The door 14 is provided with an electric lock. Incidentally, the ventilation hole 31a of the lower closing plate 31 and the upper closure plate 36, the total open area of 36a are each 203700Mm ² and 223400Mm ^2, respectively the total open area of the small holes 14a of the pair of doors 14 147600Mm ² and 73800Mm ² Met. Further, a radio wave absorber formed by impregnating carbon in urethane foam and having length, width and thickness of 350 mm, 350 mm and 25 mm, respectively, was attached to the inner surface of the other door on the back side.
<Example 2>
A vent hole formed in the upper closing plate and a small hole formed in the pair of doors were formed into a punching hole structure having a hole diameter of 5 mm. There was no electric lock on the door. The configuration other than the above was the same as that of Example 1.
<Example 3>
The small holes formed in the pair of doors had a punching hole structure with a hole diameter of 5 mm, and these small holes were closed with a stainless steel plate having a thickness of 1.0 mm. There was no electric lock on the door. The configuration other than the above was the same as that of Example 1.

<Comparison test and evaluation>
The electromagnetic shielding performance of the electromagnetic shielding boxes of Examples 1 to 3 was measured. This electromagnetic wave shielding performance is measured using a method recommended by the Architectural Institute of Japan (insertion loss method), and is horizontally polarized and vertically polarized at each frequency of 300, 400, 500, 600, 700, 800, 900 and 1000 MHz. The shielding performance of was measured. However, the actual frequency used was a value obtained by subtracting 1 MHz from each frequency in order to prevent harmonic oscillation of the measuring instrument. A measurement signal is transmitted and received between two antennas, and a difference V between a transmission / reception level V ₁ (dBμV: reference value) outside the electromagnetic shielding box and a transmission / reception level V ₂ (dBμV: reception value) inside the electromagnetic shielding box. _S (dBμV) was defined as electromagnetic shielding performance. The signal generator is 8657B manufactured by Hewlett Packard, 3146 manufactured by EMCO is used as a transmitting antenna, MBA-101 manufactured by Micro Wave Factory is used as a receiving antenna, and NEC Engineering is used as a spectrum analyzer. SpeCat manufactured by the company was used, and a 5D-2W equivalent product was used as the coaxial cable. The measurement system noise level was 76 dBm or less, and the SG (signal generator) output was 10 dBm. The results are shown in Tables 1 to 3.

  As apparent from Tables 1 to 3, it was found that all of the electromagnetic wave shield boxes of Examples 1 to 3 showed a high shielding performance of 30 dB or more. In addition, it was found that even if the ventilation hole and the observation hole were changed from the honeycomb structure to the punching hole structure, the electromagnetic shielding performance did not change greatly. Furthermore, in Example 3 where the peep hole formed in the door was closed with a stainless steel plate, it was found that an extremely high electromagnetic shielding performance of 45 dB or more was exhibited. Note that the electromagnetic wave shielding performance was improved in Example 3 because the peephole was closed with a stainless steel plate.

It is a disassembled perspective view of the electromagnetic wave shield box of embodiment of this invention. FIG. 10 is a sectional view taken along line AA in FIG. 9. It is a principal part perspective view which shows the state just before bonding the shield member for side plates to the side plate of the shield box with an adhesive. It is a principal part perspective view which shows the state just before attaching the side plate to which the shield member for side plates was adhere | attached to the side surface of frame | skeleton. It is a principal part perspective view which shows the state just before bonding the lower shield member for support | pillars with the adhesive to the lower member of the shield box. It is a principal part perspective view which shows the state just before attaching a support | pillar to the lower member to which the support | pillar lower shield member was adhere | attached. It is a principal part perspective view which shows the state just before bonding the upper shield member for support | pillars with the adhesive to the upper member of the shield box. It is a principal part perspective view which shows the state just before attaching a support | pillar to the upper member to which the support | pillar upper shield member was adhere | attached. It is a side view of the shield box. It is a top view of the shield box.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Electromagnetic shielding box 11 Lower member 12 Post 13 Upper member 14 Door 16 Side plate 17 Door opening 18 Side plate opening 21 Door shield member 24, 27, 29 Adhesive 24 Side plate shield member 26 Lower shield member 28 Upper shield member for prop

Claims (8)

A lower member (11) having conductivity and forming a floor, a plurality of columns (12) having conductivity and standing at predetermined intervals around the periphery of the lower member (11); An upper member (13) that connects the upper ends of the plurality of columns (12) to form a ceiling, and has openings between the plurality of columns (12) that have conductivity (17, 18). A door (14) that releasably closes the door opening (17) and a side plate that closes the openings (18) between the plurality of support columns (12) except for the door opening (17) that has conductivity. (16)
The door (14) is detachably attached to one or more selected from the group consisting of the lower member (11), the support column (12) and the upper member (13),
The side plate (16) is removably attached to the lower member (11), the support column (12) and the upper member (13), respectively.
The door shield member (21) formed of a strip-shaped non-woven fabric having conductivity and heat resistance and elastically deformable has the entire periphery of the door (14) and the lower periphery of the door (14) facing the entire periphery. Interposed between the member (11), the strut (12) and the upper member (13),
The side plate shield member (23) formed of a belt-like nonwoven fabric having conductivity and heat resistance and elastically deformable is opposed to the entire periphery of the side plate (16) and the entire periphery of the side plate (16). An electromagnetic wave shielding box that is interposed between the member (11), the support post (12), and the upper member (13). The column (12) is removably attached to the lower member (11) and the upper member (12),
A support lower shield member (26) formed of a strip-shaped nonwoven fabric having conductivity and heat resistance and elastically deformable is a lower end facing the lower end of the support (12) and the lower end of the support (12). Interposed between the member (11),
A support upper shield member (28) formed of a strip-shaped nonwoven fabric having conductivity and heat resistance and elastically deformable is opposed to the upper end of the support (12) and the upper end of the support (12). The electromagnetic wave shielding box according to claim 1, which is interposed between the member (13).   The electromagnetic shielding box according to claim 1, wherein the door shield member (21) and the side plate shield member (23) each have a thickness of 0.5 to 3 mm.   The electromagnetic wave shielding box according to claim 2, wherein each of the lower shield member (26) and the upper shield member (28) has a thickness of 0.5 to 3 mm.   The door shield member (21) is bonded to the entire periphery of the door (14) or the lower member (11), the column (12), and the upper member (13) facing the entire periphery of the door (14) with an adhesive, The side plate shield member (23) is adhered to the entire periphery of the side plate (16) or the lower member (11), the support column (12), and the upper member (13) facing the entire periphery of the side plate (16) with an adhesive. The electromagnetic shielding box according to claim 1.   The support lower shield member (26) is adhered to the lower end of the support post (12) or the lower member (11) facing the lower end of the support post (12) with an adhesive (27), and the support upper shield member (28 The electromagnetic wave shielding box according to claim 2, wherein the upper member (13) is bonded to the upper end of the column (12) or the upper member (13) facing the upper end of the column (12) with an adhesive (29).   The electromagnetic wave shield box according to claim 5 or 6, wherein the adhesive (24, 27, 29) is a hot melt adhesive formed in a sheet shape having a mesh.   The electromagnetic wave shield box according to claim 5 or 6, wherein the adhesive is a hot-melt adhesive having conductivity.

Images