JP3119549B2 - Electromagnetic shield device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic shield device capable of easily shielding unnecessary electromagnetic waves radiated from an electronic device and extraneous electromagnetic waves arriving at the electronic device after the electronic device is installed.

[0002]

2. Description of the Related Art In recent years, various electronic devices such as a computer and a communication device have been digitized and operated at high speeds. Has become.

At the same time, the operating voltage of a logic element used in an electronic device has been reduced, and the electronic device has a tendency to malfunction due to extraneous electromagnetic waves. Conventionally, as one method of an emergency measure in the case where the above-described electromagnetic interference occurs after installation of this kind of electronic device, as shown in FIG.
At 00, an electromagnetic shield is provided to cover the entire electronic device 200. Further, as another method of emergency measures, a method of closing a gap formed in a peripheral portion of a door of an electronic device housing with a conductive tape with an adhesive has been used.

[0004]

According to the first method described above, if the wire mesh 100 has a large opening or a discontinuous portion, a sufficient electromagnetic shielding effect cannot be obtained.
It is necessary to cover the periphery of the electronic device 200 without gaps.

Therefore, there is a problem that it is difficult for an operator to approach the electronic device 200 or to operate the electronic device 200. Although the method of covering with the wire mesh 100 can be performed while the electronic device 200 is operated, the wire mesh 10
0 can cover the front, rear, left side,
Up to five right and side surfaces and no electromagnetic shielding effect can be obtained for the lower surface of the electronic device 200 into which the cable is introduced, which is insufficient as a countermeasure.

[0006] In addition, this method requires a large installation space, so that the passage is narrowed and the aesthetic appearance is significantly impaired. Further, according to the above-described second method, the insulating coating is applied to the surface of the housing, and the conductive tape and the housing are not electrically connected. Therefore, the electromagnetic shielding effect obtained by this method is low. Small and inadequate as a countermeasure.

It is to be noted that only small gaps can be closed with the conductive tape by this method, and it is difficult to close large gaps such as a cable inlet, and it is difficult to open and close the door, There is also a problem that is damaged.

The present invention has been made in view of the above points, and has a sufficient electromagnetic shielding effect against unnecessary electromagnetic waves radiated from an electronic device to be mounted and external electromagnetic waves arriving at the electronic device. It is another object of the present invention to provide an electromagnetic shield device which can be easily attached to an electronic device in operation, and which has good maintainability and excellent appearance after the attachment.

[0009]

According to the present invention, there is provided an upper shield adapter additionally mounted corresponding to an upper surface of a mounting case, and a lower portion of the mounting case. A lower shield adapter that is additionally mounted corresponding to the upper shield adapter that is mounted with an electrical connection corresponding to the upper shield adapter so as to cover an upper surface of the mounted housing; A pair of side shield members attached so as to cover the pair of side surfaces of the mounted housing and having an electrical connection corresponding to the upper shield adapter and the lower shield adapter, and a front surface of the mounted housing; And a front and rear surface which is openably and closably mounted with an electrical connection corresponding to the upper shield adapter and the lower shield adapter so as to freely open and close the rear surface. A pair of shield door members, and a bottom shield member attached to the lower shield adapter or the lower part of the mounted housing so as to cover the bottom surface of the mounted housing with electrical connection corresponding to a lower portion of the mounted housing. , Wherein the top shield member or the bottom shield member is formed so as to be able to introduce an introduction cable of the housing to be mounted.

Further, according to the present invention, there is provided an electromagnetic shield device characterized in that the upper shield adapter is made up of a plurality of dividable elements for introducing an introduction cable of the attached casing.

Further, according to the present invention, in order to introduce the introduction cable of the attached casing, the upper surface shield member has a notch, and the cylindrical conductive member has an opening and closing portion in the notch. There is provided an electromagnetic shield device characterized by adding a conductive cloth.

Further, according to the present invention, the bottom shield member is configured to be mutually connectable by a plurality of conductive cloths for introducing the introduction cable of the attached casing. An electromagnetic shielding device is provided.

[0013]

According to the above means, the electromagnetic shield device of the present invention comprises an upper and lower shield adapter added to each of the upper surface and the lower portion of the housing of the electronic device to be mounted, and the electrical connection with each of the adapters. A top cover (shield member) having a portion, a front door and a back door (shield member), and a pair of side covers (shield member), and the side cover, the front door, and the back door are each electrically connected at a side end. The lower surface cover (bottom shield member) which surrounds five surfaces except the bottom surface of the housing by having the portion and is additionally fixed to the bottom surface of the housing and has an electrical connection portion with the housing or the adapter. It is configured to close the bottom surface of the housing.

According to such a configuration, the outer peripheral surface of the housing of the electronic device to be mounted is covered with the door and the cover which are electrically connected to each other directly or via the housing. A high shielding effect can be given to the device.

In general, the surface of a housing of an electronic device is coated with an insulating material for rust prevention or the like, and cannot be used as an electrical connection surface.
Although the shield effect cannot be imparted only by replacing the cover alone, in the present invention, the upper and lower shield adapters are used to form the shield surface around one side of the housing, so that the surface of the housing is painted. Even if it is done, it does not change the shield effect provided at all.

The top cover, front door, and back door provided in the housing are used to attach the top cover (shield member), front door, and back door (shield member) of the electromagnetic shield device of the present invention. It is not always necessary to remove them if they do not interfere with each other, but removing them is more convenient in terms of heat dissipation and maintainability of the device.

[0017]

FIG. 1 is an exploded perspective view of a first embodiment of the electromagnetic shield device of the present invention. This embodiment shows an example of a case where the electronic device is mounted on an electronic device installed on a double floor.

FIGS. 2 and 3 are a side sectional view and a transverse sectional view, respectively, of this embodiment. In FIG. 1, reference numeral 1 denotes a housing frame of an electronic device to be mounted, 2 denotes a pedestal for fixing the housing frame 1 to a floor, 3 denotes an upper shield adapter for an electromagnetic shield device according to the present invention, and 4 denotes Similarly, a lower shield adapter, 5 also a front door (shield member), 6 a back door (shield member), 7 a pair of left and right side covers (shield member), 8 an upper cover (shield member), and 9 Similarly, a lower surface cover (shield member), 10 is a front and rear hakama plate, and 11 is a left and right hakama plate.

The upper shield adapter 3 is mounted on the front of the frame 1 as shown in FIG. 2 after removing the upper cover previously provided in the housing, and utilizes the screw holes provided on the upper surface in advance. It is fixed to the frame 1 by screws 12.

The screw holes are provided in advance for mounting an eye bolt for lifting the electronic device during transportation and a connecting plate for connecting and fixing the frame to an adjacent device. Are provided at the four corners of the upper surface.

A notch 13 is provided on a side surface of the upper shield adapter 3 as an escape when the above-mentioned connecting plate is used. The upper shield adapter 3 has a top cover 8
Is attached with a screw using a screw hole provided in a peripheral portion of the upper shield adapter 3.

The upper cover 8 is preferably made of expanded metal or punched metal having good heat dissipation.
The front and rear portions of the upper shield adapter 3 protrude from the upper surface of the frame 1 by the thickness of the front door 5 and the rear door 6, respectively.

The lower shield adapter 4 is attached to the front and rear lower corners of the frame 1 after removing the front door and the rear door previously provided on the front portion 14 and the rear portion 15 of the housing frame 1. The body frame 1 is fixed to the frame 1 by screws 16 using two screw holes provided at both ends for attaching a front door and a rear door provided in advance.

The lower shield adapter 4 is also fixed to the front and rear skirt plates 10 attached to the pedestal 2 by screws 17. The lower cover 9 is made of four conductive cloths 18.

The upper ends of the two conductive cloths 18 are sandwiched between the lower shield adapter 4 and a screw fixing portion between the front and rear skirt plates 10, and the lower ends are inserted into the lower part of the frame 1. Further, the upper ends of the other two conductive cloths 18 are fixed to the upper surfaces of the left and right skirt plates 11 with screws, and the lower ends are inserted into the lower part of the frame 1 through the center notch of the pedestal 2.

The four conductive cloths 18 are connected to each other using a hook-and-loop fastener provided at each side end, and surround a cable 19 introduced into the apparatus. Further, a cable 19 is provided by using a band 20 provided below the conductive cloth 18.
Wrap around there is no gap around.

As described above, the lower cover 9 has a drawstring shape.
The conductive cloth 18 is preferably made of a woven thin metal wire or metal-plated fiber.

Further, in order to prevent electrical contact between the conductive cloth 18 and the double floor member, it is convenient to use a conductive cloth 18 whose outer surface is coated with an insulating resin or the like.

At both ends of the upper and lower parts of the front door 5 and the back door 6, rod rods 21 which are fixed shafts for opening and closing the door are attached, and holes provided in the upper shield adapter 3 and the lower shield adapter 4 are provided. The front door 5 and the back surface 6 are held between the upper shield adapter 3 and the lower shield adapter 4 by inserting the rod 21.

The front door 5 and the back door 6 each have a double-opened shape divided into two parts at the center, and a rod bar 22 for locking the left and right doors is provided at an intermediate portion thereof. Holes are provided in the middle portions of the upper shield adapter 3 and the lower shield adapter 4, respectively.

As shown in FIGS. 2 and 3, conductive packings 23 are mounted horizontally on the inner upper and lower ends of the front door 5 and the rear door 6, and are compressed appropriately when the door is closed.

The surfaces of the conductive packing mounting portions of the doors 5 and 6 and the contact portions of the conductive packing 23 of the upper shield adapter 3 and the lower shield adapter 4 are treated with untreated stainless steel or nickel plating. The conductive packing 2
Each of the doors is electrically and stably connected to the upper shield adapter 3 and the lower shield adapter 4 by way of the door 3.

As shown in FIG. 1, a conductive packing 23a is vertically attached to the intermediate portion between the front door 5 and the back door 6 to electrically connect the left and right doors to each other. When the door is closed, the left and right doors are electrically connected stably.

Here, the front door 5 and the back door 6 are provided with ventilation openings in accordance with the ventilation configuration of the housing frame 1. In the present embodiment, a ventilation port 24 is provided in the front door 5.

The ventilation port 24 is formed by punching a large number of small holes into the door. As shown in FIG. 2, a shield window 2 is provided above the front door 5.
5 is attached so that display lamps, display characters, and the like, which are previously attached to the upper portion of the frame 1, can be seen from the outside.

Here, the shield window 25 is formed by attaching a fine metal mesh to a transparent plate made of acrylic or the like, and has both shielding properties and visibility. As shown in FIG. 3, the side cover 7 is attached to the four corners on the side surface of the frame 1 using screws 26.

The screw holes for attaching the side cover 7 are provided on the side surface of the frame 1 in advance for attaching the side cover provided in the housing in advance. A conductive packing 23 is attached to the upper and lower ends of the side cover 7 in a horizontal direction. The conductive packing 23 is fixed between the side cover 7, the upper shield adapter 3, and the left and right skirt plates 11 by tightening a screw 26. Compressed.

The conductive packing mounting portion of the side cover 7 and the upper shield adapter 3, the left and right skirt plates 11
The surfaces of the contact portions of the conductive backing 23 are made of stainless steel having no surface treatment or plain steel treated with nickel plating or the like, so that the side cover 7 and the upper shield adapter 3, The left and right hakama plates 11 are electrically stably connected.

As shown in FIG. 1, both ends of the side cover 7 and each end of the front door 5 and the back door 6 are connected to the conductive cloth 2.
7 are connected. The conductive cloth 27 is attached to both side ends of the side cover 7 using screws in advance, and after the side cover 7, the front door 5, and the back door 6 are attached, respectively, the front door 5, the back door 6 The front door 5 and the rear door 6 are attached to the respective side ends of the front door 5 and the rear door 6 with screws opened.

As described above, the side cover 7 and the front door 5 and the back door 6 are connected by using the conductive cloth 27, so that they are always electrically connected stably. Here, it is convenient from the viewpoint of mounting work that a screw hole is provided in advance at a side end of the conductive cloth 27 and a fixing plate is applied when fixing the screw.

As described above, the electromagnetic shielding device according to the first embodiment has high shielding performance because the six surfaces around the housing frame to be mounted are covered with the metal plate and the conductive cloth which are electrically connected to each other. Thus, a shield structure having stability is formed.

FIG. 4 is an exploded perspective view of a second embodiment of the magnetic shield device according to the present invention. This embodiment shows an example of a case where the apparatus is attached to a device directly installed on a general floor.

Only the parts related to the upper shield adapter, the upper cover, and the lower cover are different from the case where the electronic apparatus is mounted on the electronic device installed on the double floor according to the above embodiment. , Side cover 7
The structure and mounting method of the parts related to the above are exactly the same as those in the case of the apparatus installed on the double floor according to the above embodiment.

As shown in FIG. 4, the upper shield adapter 3 'is composed of a part 28 divided into two parts in the front-rear direction and a part 29 for connecting these parts. On the top cover 30,
A notch having an area equal to or greater than the cross-sectional area of the cable 31 introduced from the upper surface into the device housing frame 1 is provided, and a cylindrical conductive cloth 32 having an opening / closing portion is provided in the notch. Installed.

As described above, since the upper shield adapter 3 'can be divided and the conductive cloth 32 can be opened and closed, the upper shield adapter 3' and the upper cover 30 can be attached while the cable 31 is still connected. it can.

The opening / closing portion of the conductive cloth 32 is closed by a hook-and-loop fastener attached along the end of the conductive cloth, and the band 33 is further sealed by removing the gap around the cable.

In a device directly placed on a general floor, a plate-shaped lower cover is usually attached to the lower portion of the housing in advance, but in this case, it is not necessary to newly attach the lower cover.

In some rare cases, the lower cover may be omitted. In this case, the lower cover 34 is inserted into the lower portion of the frame, and a screw hole provided in advance for the lower cover on the lower edge of the frame is used. And fix it with screws.

In the second embodiment, the upper shield adapter composed of a plurality of dividable elements has been described as being used for a directly-placed housing. There is no problem, and in this case, there is an advantage that the upper shield adapter can be integrated into one type.

FIG. 5 is an exploded perspective view of a third embodiment of the electromagnetic shield device according to the present invention. The present embodiment is an example in which a plurality of housings A, B, and C are installed in a row on a double floor in close proximity, and an electromagnetic shield device is attached to two housings A and B near the end of the row. Is shown.

Also in this embodiment, the basic structure is the same as the case where the housing is independently installed on the double floor as described above, and the difference is that the upper shield adapter 3 and the The point where the left and right skirt plates 11, the front door 5, and the rear door 6 are connected to each other by the conductive cloth 35, the conductive cloth 36, the conductive cloth 37, and the conductive cloth 38, respectively, and the housings B and C are conductive. This is a point that is separated by the sexual cloth 39.

The conductive cloth 35 is used for the upper shield adapter 3.
Is attached to the upper shield adapter 3 using a screw hole provided at a side end of the upper shield adapter 3.

After the conductive cloth 36 is attached to the two left and right skirt plates 11 with screws together with the conductive cloth constituting the lower surface cover 9, the whole is inserted into the lower portion between the housings.
Fixed to pedestal 2.

The conductive cloth 37 is attached to both ends of the front door 5 with screws in a state where the front door 5 is opened, as in the case between the front door 5 and the side cover 7. The conductive cloth 38 is similarly attached to the back door 6.

The conductive cloth 39 is attached to the left and right skirt plates 11 together with the conductive cloth constituting the lower surface cover 9 and then inserted into the lower portion between the housings B and C. The left and right hakama boards 11 are fixed to the pedestal 2.

On the other hand, the upper end of the conductive cloth 39 is fixed to the upper shield adapter 3 and the side ends are fixed to the front door 5 and the rear door 6 using screws. Here, it is convenient from the viewpoint of mounting work that a screw hole is provided in advance at a side end of each conductive cloth and an appropriate abutment plate is applied when fixing the screw.

In the case where the housings B and C are connected by a connecting plate on the upper surface of the housing, the connecting plate is temporarily removed before the upper shield adapter 3 is attached, and the upper shield adapter 3 is placed on the upper surface. After that, the connecting plate is returned to the original position using the cutout provided in the upper shield adapter 3 and fixed together with the upper shield adapter 3 with screws.

As described above, in the electromagnetic shielding device according to the third embodiment, the six surfaces around the two connected housing frames are covered with the metal plate and the conductive cloth which are electrically connected to each other. A shield structure having high shielding properties and stability is formed.

Although the above embodiment shows a case where a plurality of cabinets are installed close to a double floor, a case where a plurality of cabinets are installed close to a general floor has been described. Obviously, the shield structure can be formed in the same manner by the combination of the components described above.

As described above, according to the present invention, the upper and lower shield adapters to be added to the upper surface and the lower portion of the housing of the electronic device to be mounted, respectively, and the electrical connection portion to each of the shield adapters are provided. It has a top cover (shield member), a front door and a back door (shield member), and a pair of side covers (shield member). Each of the side cover, the front door, and the back door has an electrical connection portion at a side end. In this way, the bottom surface of the housing is surrounded by the lower surface cover (bottom shield member) that surrounds the five surfaces except the bottom surface of the housing and is additionally fixed to the bottom surface of the housing and has an electrical connection with the housing or the adapter. It is configured to close the bottom surface.

Accordingly, the outer peripheral surface of the housing around the housing of the electronic device to be mounted is covered with the door and the cover which are electrically connected to each other directly or via the housing. An advanced and stable shielding effect can be imparted to the mounted electronic device regardless of the presence or absence.

Further, according to the present invention, it is possible to mount using only the screw holes provided in the housing to be mounted in advance, and to divide the cable introduced into the electronic device to be mounted into a divided form. Since there is no need to process the housing or remove the cable, it can be attached to the operating device in a short time.

Further, according to the present invention, since various parts can be connected and partitioned between adjacent housings by using a conductive cloth, it is possible to cope with any installation mode of the apparatus. Further, according to the present invention, the doors that can be opened and closed are attached to the front and rear of the housing, so that maintainability equal to or higher than that before the countermeasure can be obtained. In addition, in the present invention, since the amount of protrusion from the housing before and after is as small as the thickness of the door, the passage and the appearance are not hindered.

[0064]

According to the present invention, as described in detail above, the present invention has a sufficient electromagnetic shielding effect against unnecessary electromagnetic waves radiated from the electronic device to be mounted and external electromagnetic waves arriving at the electronic device. In addition, it is possible to provide an electromagnetic shield device that can be easily attached to an electronic device in operation, and that has good maintainability after attachment and an excellent appearance.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing a first embodiment of the present invention.

FIG. 2 is a side sectional view in the first embodiment.

FIG. 3 is a cross-sectional view of the first embodiment.

FIG. 4 is an exploded perspective view showing a second embodiment of the present invention.

FIG. 5 is an exploded perspective view showing a third embodiment of the present invention.

FIG. 6 is a diagram showing a conventional electromagnetic shield structure.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Housing frame, 2 ... Pedestal, 3 ... Upper shield adapter, 4 ... Lower shield adapter, 5 ... Front door,
6 ... back door, 7 ... side cover, 8, 30 ... top cover, 9, 34 ... bottom cover, 10 ... front and rear hakama board, 11 ... left and right hakama board, 12, 16, 17, 26 ... screw, 13 ... notch Part, 14: front surface of the housing, 15: rear surface of the housing, 18, 2
7, 32, 35, 36, 37, 38, 39 ... conductive cloth,
19, 31 ... cable, 20, 33 ... band, 21, 22
2 ... rod rod, 23 ... conductive packing, 24 ... ventilation opening, 25 ... shield window, 28, 29 ... upper shield adapter part.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-5-235578 (JP, A) JP-A-4-290510 (JP, A) JP-A-59-151500 (JP, A) JP-A-4- 56196 (JP, A) JP-A-4-29796 (JP, A) JP-A-62-145397 (JP, U) JP-A-60-172379 (JP, U) JP-A-3-128994 (JP, U) Hikaru 4-44195 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) H05K 9/00

Claims (4)

(57) [Claims] 1. An upper shield adapter additionally attached corresponding to an upper surface of an attached housing; a lower shield adapter additionally attached corresponding to a lower portion of the attached housing; An upper shield member attached so as to have an electrical connection corresponding to the upper shield adapter so as to cover an upper surface of the mounting housing; and the upper shield so as to cover a pair of side surfaces of the mounted housing. A pair of side shield members attached in a state of having an electrical connection corresponding to the adapter and the lower shield adapter, and the upper shield adapter and the lower shield so as to openably and closably cover the front and rear surfaces of the attached housing. A pair of front and rear shield door members that are openably and closably mounted with an electrical connection corresponding to the adapter, and cover a bottom surface of the mounting housing; A lower shield adapter or a bottom shield member that is attached in a state of having an electrical connection corresponding to a lower portion of the attached casing, wherein the upper shield member or the bottom shield member is attached to the lower casing. An electromagnetic shield device formed so that an introduction cable for a housing can be introduced. 2. The electromagnetic shield device according to claim 1, wherein the upper shield adapter is composed of a plurality of dividable elements for introducing an introduction cable of the housing to be attached. 3. The top shield member has a notch for introducing an introduction cable of the attached casing,
The electromagnetic shield device according to claim 2, wherein a cylindrical conductive cloth having an opening / closing portion is added to the notch. 4. The apparatus according to claim 1, wherein the bottom shield member is configured to be connectable to each other by a plurality of conductive cloths for introducing an introduction cable of the attached housing. Electromagnetic shielding device.