JP2004014638A - Electronic apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electronic apparatus which can be used at a low cost, can eliminate screwing steps for electrical continuity, and can remove restrictions on a structural design at a sub-rack side. <P>SOLUTION: This electronic apparatus comprises vent opening parts 12a, 12b arranged in a housing to radiate heat from the electronic devices housed in the housing, shield panels 21 having a honeycomb structure which has ventilating performance and electromagnetic shield effect, and frames 14 which are arranged at the vent opening parts 12a, 12b so as to surround and hold the shield panels 21 from the circumference to block off electromagnetic wave generated from the vent opening parts 12a, 12b. The outside dimension of the shield panels 21 and the inside dimension of of the frames 14 are designed so that the shield panels 21 are deflected by being pushed by the frames 14. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention generally relates to an electronic apparatus, and more specifically, to an aluminum honeycomb shield panel provided as an EMI (Electro Magnetic Interference) shield in a ventilation opening for heat radiation provided in the electronic apparatus. The present invention relates to an electronic device having an improved mounting structure.
[0002]
[Prior art]
FIG. 8 is a perspective view of a conventional electronic device on which a subrack is mounted. FIG. 9 is a schematic sectional view thereof.
[0003]
A conventional electronic device will be described with reference to these drawings. A plurality of sub-racks 10 and a fan unit 31 are housed inside a frame 30 of the electronic device. An intake port 32 a is provided at a lower portion of the frame 30. An exhaust port 32b is provided at an upper portion of the frame 30. The subrack 10 is a housing made of metal and houses a plurality of electronic circuit packages 11 as electronic devices inside. In addition, ventilation holes 12a and 12b through which wind for cooling the heat generated from the package 11 passes are provided on the bottom surface and the top surface of the subrack 10, respectively. Further, if the package 11 generates an electromagnetic wave and leaks from the ventilation holes 12a and 12b, it interferes with the operation of the package in another adjacent subrack 10 and other electric equipment in the vicinity. Therefore, the EMI shield 20, which has ventilation and has an electromagnetic wave shielding effect, is placed over the ventilation openings 12a and 12b as a cover to shield electromagnetic waves.
[0004]
In the state shown in FIGS. 8 and 9, the outside air sucked in by the fan 31 from the intake port 32 a of the rack 30 enters the subrack 10 from the ventilation port 12 a provided in the lower part of the lowermost subrack 10. After the taken-in and mounted package 11 is cooled, it escapes from the vent 12b on the upper surface of the subrack 10, cools the inside of the subrack 10 in the next and subsequent stages in the same manner, and then exhaust air provided on the It is discharged from the mouth 32b to the outside.
[0005]
As described above, the EMI shield 20 is required to have both the ventilation performance and the electromagnetic wave shielding performance, and a metal plate having many holes that are sufficiently smaller than the wavelength of the electromagnetic wave to be shielded is used. Generally, a punching metal is used in a region where the frequency of the electromagnetic wave that needs to be shielded is low, and an aluminum honeycomb shield panel is used as an EMI shield in a region where the frequency of the electromagnetic wave that needs to be shielded is high.
[0006]
FIG. 10 is a perspective view of an aluminum honeycomb shield panel.
As shown in FIG. 10, the aluminum honeycomb shield panel 21 is formed by forming aluminum foil in a honeycomb shape, and the size and depth of the hole (the thickness of the panel) which is opened through both sides in the thickness direction of the panel shape ) Shields electromagnetic waves, and the partition between adjacent holes is made of an extremely thin aluminum foil, so that a substantial opening area is large and good ventilation performance is provided. However, since the material is aluminum foil, it can easily be deformed by an external force if it is strongly pressed. Therefore, as shown in FIG. 11, the outer periphery is integrally held and fixed by a strong frame 22, and used as an aluminum honeycomb shield panel unit. Is done. Details will be described below.
[0007]
An example of a conventional EMI shield structure provided in a ventilation opening of a subrack using an aluminum honeycomb shield panel will be described with reference to FIGS.
[0008]
FIG. 11 is a perspective view of a unitized aluminum honeycomb shield panel, and FIGS. 12 to 16 are process diagrams for manufacturing the aluminum honeycomb shield panel.
[0009]
Referring to FIG. 11, aluminum honeycomb shield panel unit 20 includes aluminum honeycomb shield panel 21 and frame 22. The screw through hole 23 for attachment is provided through the frame 22 and the aluminum honeycomb shield plate 21 after being unitized.
[0010]
Next, the uniting process will be described.
As shown in FIG. 12, a frame 22 formed from an extruded material channel having a V-shaped cut in a bent portion is prepared. As shown in FIG. 13, in the process of bending the frame 22, the aluminum honeycomb shield panel 21 is inserted into the enclosure, and the corners are finally welded together.
[0011]
Thereafter, as shown in FIG. 14, the edge portion 22b of the frame 22 is bent and swaged so that the claw 22c is bitten, and the aluminum honeycomb shield panel 21 and the frame 22 are electrically connected and fixed.
[0012]
FIG. 15 shows a cross-sectional view of the crimped state.
In some cases, as shown in FIG. 16, the reliability of electrical conduction may be increased with the conductive gasket 24 interposed therebetween.
[0013]
FIG. 17 is an exploded perspective view of the EMI shield provided in the ventilation opening of the subrack, and FIG. 18 is an external view thereof.
[0014]
Referring to FIG. 17, package 11 is stored in subrack 10. Ventilation openings 12a and 12b are provided on the bottom and top surfaces of the subrack 10, respectively. The subrack 10 further includes a cut-and-raised hole 16. The cut-and-raised hole 16 is for forming the guide rail 15 for holding the package 11 in the housing of the subrack 10. The screw hole 13 is provided around the ventilation opening. The screw holes 13 are arranged on the same plane so as to surround the ventilation openings 12a and 12b, and are provided at intervals sufficiently smaller than the wavelength of electromagnetic waves generated from the package. The front panel 40 is fixed to the screw holes 17 provided on the upper and lower portions of the front surface of the subrack 10 by front panel mounting screws 41 from the front side of the subrack 10, and is electrically connected thereto.
[0015]
Further, the aluminum honeycomb shield panel unit 20, the aluminum honeycomb shield panel 21, and the aluminum frame 22 are screwed around the ventilation opening of the subrack 10 by screws 25 through screw through holes 23 provided in the aluminum frame. Fixed to. The screw hole 13 and its periphery form a plated conductive part, and are electrically connected to the fixed aluminum frame 22.
[0016]
Next, the operation will be described.
Referring to FIGS. 17 and 18, heat generated from package 11 housed in subrack 10 is cooled by outside air taken in from holes of aluminum honeycomb shield panel 21 covered by ventilation opening 12 a. The air is exhausted to the outside from the hole of the aluminum honeycomb shield panel 21 covered by the ventilation opening 12b. Electromagnetic waves generated from the package 11 are shielded on the front side by a front panel 40 that is electrically connected. In the ventilation openings 12a and 12b, the aluminum honeycomb shield panel 21 is electrically connected to the subrack 10, functions as an EMI shield, and shields electromagnetic waves.
[0017]
In addition, in the portion where the aluminum honeycomb shield panel unit 20 and the subrack 10 are attached, the periphery of the screw hole 13 provided around the ventilation opening and the aluminum frame 22 are electrically connected. Further, since the screw holes 13 are provided at intervals sufficiently smaller than the wavelength of the generated electromagnetic wave, leakage of the electromagnetic wave from this mounting portion is blocked.
[0018]
[Problems to be solved by the invention]
The EMI shield provided at the ventilation opening of the subrack using the conventional aluminum honeycomb shield panel has been configured as described above.
[0019]
However, it is necessary to assemble the aluminum honeycomb shield panel as a unit in a state where it is electrically connected to the aluminum frame in advance, and the cost of unitization is very high.
[0020]
Further, when this unit is attached to the ventilation opening of the subrack again, it is necessary to arrange screws at intervals sufficiently smaller than the wavelength of the electromagnetic wave to be shielded in order to eliminate leakage of electromagnetic waves from the attachment portion.
[0021]
Furthermore, the periphery of the ventilation opening on the subrack side needs to be on the same plane that is continuously connected in order to obtain electrical contact with the aluminum frame over the entire circumference. If the raised hole 16 becomes large, this part is interrupted, and a step due to joining of sheet metal members of the housing to make the same plane cannot be provided in this part. Was giving.
[0022]
The present invention has been made in order to solve the above-described problems, and an electronic device improved in such a manner that an aluminum honeycomb shield panel can be directly attached to a subrack side without being unitized in advance. The purpose is to provide.
[0023]
Another object of the present invention is to provide an electronic apparatus improved so that it can be used at low cost.
[0024]
Still another object of the present invention is to provide an electronic apparatus improved so as to eliminate screws for obtaining electrical continuity and to eliminate restrictions on the structural design of the subrack side. .
[0025]
[Means for Solving the Problems]
An electronic device according to the present invention is a shield panel having a honeycomb structure having a ventilation opening provided in the housing for radiating heat from an electronic device housed in the housing, a ventilation performance and an electromagnetic wave shielding effect. In order to shield electromagnetic waves from the ventilation opening, a frame is provided which surrounds and holds the honeycomb structured shield panel from the periphery and is disposed in the ventilation opening. The outer dimensions of the honeycomb structured shield panel and the inner dimensions of the frame are selected so that the honeycomb structured shield panel is pressed and bent by the frame.
[0026]
According to the present invention, the outer edge side surface, which is the side surface of the honeycomb-shaped hole that is opened through both thickness direction surfaces, is pressed so as to be pressed inward to hold the honeycomb structured shield panel. Point contact with the housing was enabled by the pressure generated by the reaction force due to the bending of the hole. Therefore, since it is not necessary to unitize the shield panel having the honeycomb structure by holding and fixing it, it can be used inexpensively, and a large number of screws for obtaining electrical contact are not required.
[0027]
In addition, since the electrical contact between the honeycomb structure shield panel and the housing at the hole opening surface, which is the mating surface of the subrack, has been eliminated, the corresponding portion on the housing side may be interrupted by the hole, and the subrack can be cut off. The restriction on the design of the housing structure can be eliminated.
[0028]
According to the present invention, a gasket having conductivity is provided between the shield panel having the honeycomb structure and the frame.
[0029]
According to the present invention, the frame is provided for accommodating the housing, and the frame is attached to the frame.
[0030]
According to the present invention, a protective member for protecting the honeycomb structured shield panel is attached to the frame.
[0031]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0032]
Embodiment 1
FIG. 1 is an external perspective view of an electronic apparatus according to Embodiment 1 of the present invention. A front panel 40, an aluminum honeycomb shield panel 21, which is a shield panel having a honeycomb structure, and a frame 22 are attached to a subrack 10. Have been.
[0033]
FIG. 2 is an exploded perspective view showing the mounting structure of the aluminum honeycomb shield panel in the electronic device shown in FIG.
[0034]
The package 11 is housed in the subrack 10. Ventilation openings 12 a and 12 b are provided on the bottom surface and the top surface of the subrack 10. The subrack 10 includes a cut-and-raised hole 16. The cut-and-raised hole 16 is for forming a guide rail 15 for holding the package 11 in the housing of the subrack 10. The frame 14 is formed integrally with the subrack 10 around the ventilation opening. A plated conductor is formed inside the frame 14. A hole 18 is provided on the back surface of the subrack 10. The front panel 40 is fixed from the front side of the subrack 10 to the screw holes 17 provided in the upper and lower portions of the front surface of the subrack 10 by front panel mounting screws 41, and is electrically connected to the subrack 10. .
[0035]
The aluminum honeycomb shield panel 21 is housed in the frame 14. The frame 22 is provided with claws 26 and holes 27. The claws 26 are hooked into the holes 17, and are fixed to the subrack 10 together with the holes 27 and mounting screws when the front panel is mounted.
[0036]
As shown in FIG. 2, the widths c and d of the opposite sides of the frame provided in the ventilation opening are defined as c = a−α, d with respect to the widths a and b of the opposite sides of the aluminum honeycomb shield panel 21. = B-α and the dimensions of c and d are set to be slightly smaller than the dimensions of a and b by α.
[0037]
FIG. 3 is a diagram showing a state where the aluminum honeycomb shield panel 21 is housed in the frame 14. Among the opposing side gaps a and b of the aluminum honeycomb shield panel 21 and the frame dimensions c and d for accommodating the same, the frame dimensions c and d are each smaller by α. For this reason, the aluminum honeycomb shield panel 21 is housed in the frame 14 in a state where the holes penetrating in the thickness direction are pressed from the side surfaces and bent, and the pressures f1 and f2 generated from the inside to the outside, respectively, Electrical contact is made with the inner surface of the frame 14.
[0038]
Next, the operation will be described. The heat generated from the package 11 accommodated in the subrack 10 is cooled by the outside air taken in from the hole of the aluminum honeycomb shield panel 21 covered by the ventilation opening 12a, and then the aluminum covered by the ventilation opening 12b. Air is exhausted from the holes of the honeycomb shield panel 21 to the outside. Electromagnetic waves generated from the package 11 are shielded on the front side by a front panel 15 that is electrically connected. In the ventilation openings 12a and 12b, the aluminum honeycomb shield panel 21 is electrically connected to the subrack 10 via a frame 14 provided around the ventilation opening. Thereby, it functions as an EMI shield and is shielded.
[0039]
Further, since the aluminum honeycomb shield panel 21 is in electrical contact with the frame 14 at a space between the frame 14 and a honeycomb-shaped hole set to a hole diameter sufficiently smaller than the electromagnetic wave to be shielded over the entire circumference, the electromagnetic wave from this portion is blocked. Is done.
[0040]
Embodiment 2
In the first embodiment, the inside of the frame 14 provided around the ventilation opening of the subrack 10 and the side surface of the aluminum honeycomb shield panel 21 come into direct contact with each other. Although an example of obtaining electrical contact with a pressure generated by a force has been described, the present invention is not limited to this, and by inserting a conductive gasket between the two to reduce the contact resistance, The EMI shielding characteristics can be further improved.
[0041]
FIG. 4 shows a specific example.
Referring to FIG. 4, conductive gasket 18 is affixed inside frame 14. FIG. 5 is a cross-sectional view showing the c dimension of the conductive gasket 18 attached to the inside of the frame 14 shown in FIG. 4 and the a dimension of the aluminum honeycomb shield panel 21.
[0042]
Referring to FIG. 5, the inner dimension c of the facing width of the conductive gasket 18 affixed to the frame 14 is expressed by c = c = the outer peripheral side width dimension a of the aluminum honeycomb shield panel 21 housed therein. a−α and α are set smaller.
[0043]
Similarly, d = b−α for the other cross sections, d and b, and the d dimension of the conductive gasket 18 is set to be smaller by α. Thus, if the aluminum honeycomb shield panel 21 is stored, the conductive gasket 18 is bent together with the opening of the aluminum honeycomb shield panel 21 so that the electrical contact resistance between them can be reduced.
[0044]
The aluminum honeycomb shield panel 21 and the frame 22 may be replaced with another metal having conductivity other than aluminum.
[0045]
Embodiment 3
In the first embodiment, the method in which the aluminum honeycomb shield panel 21 is attached to the ventilation opening provided in the subrack 10 to perform the EMI shielding has been described. However, as shown in FIG. You may.
[0046]
Referring to FIG. 6, frame 33 is a frame that houses aluminum honeycomb shield panel 21 provided inside frame 30. The frame 33 is disposed at a position that serves as an upper and lower partition of the subrack 10 when the subrack 10 is stored. The aluminum honeycomb shield panel 21 and the frame 22 are fixed to the inside of the frame 30 by screws 34 in a form that presses the aluminum honeycomb shield panel 21 housed in the frame 33 from the side of the outer wall. In this case, similarly, the dimensions a and b of the aluminum honeycomb shield panel 21 and the dimensions c and d of the storage side formed by the storage frame 33 and the frame 22 are c = a-α and d = b. −α, which is set smaller by α. As described above, the aluminum honeycomb shield panel 21 is pressurized from the side surface side, and electrical contact is secured. By storing the subrack 10 in the frame 30, the two are electrically connected (not shown).
[0047]
In this state, as in the first embodiment, heat generated from the package 11 housed in the subrack 10 is generated by the outside air taken in from the hole of the aluminum honeycomb shield panel 21 provided below the ventilation opening 12a. After being cooled, it is discharged from the aluminum honeycomb shield panel 21 provided on the upper stage of the ventilation opening 12b, and similarly, after cooling the inside of the subrack 10 in the next and subsequent stages, it is exhausted to the outside through the exhaust port 32b. . Electromagnetic waves generated from the package 11 are shielded by the upper and lower aluminum honeycomb shield panels 21 of the subrack 10. Thus, the aluminum honeycomb shield panel 21 can be arranged between the adjacent subrack 10 without overlapping.
[0048]
Embodiment 4
FIG. 7 is a perspective view showing an attachment structure of the aluminum honeycomb shield panel according to Embodiment 4.
[0049]
Referring to FIG. 7, net-like protection member 28 is attached to frame 22. Since the material is aluminum foil, the aluminum honeycomb shield panel 21 is easily deformed by an external force. For this reason, the frame 22 is covered and protected, but in order to maintain the ventilation performance, the frame 22 has substantially the shape of only the outer peripheral frame, and the central portion is open. However, if a projection hits this opening, the aluminum honeycomb shield panel 21 is easily deformed, and the hole opened on both sides is crushed and closed, and the ventilation performance is impaired or broken, because the aluminum honeycomb shield panel 21 is not protected. In many cases, the performance of the shield was impaired. For this reason, deformation | transformation with respect to external force was performed by providing the large mesh-shaped protective material 28 which does not affect the ventilation performance of an aluminum honeycomb shield panel in the opening part of the frame 22.
[0050]
The embodiments disclosed this time are to be considered in all respects as illustrative and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.
[0051]
【The invention's effect】
As described above, according to the present invention, it is not necessary to unitize the aluminum honeycomb shield panel in advance, so that the aluminum honeycomb shield panel can be used at low cost. In addition, a number of screws for obtaining electrical contact with the subrack can be eliminated, and further, a structural design restriction on the subrack side can be eliminated.
[0052]
Further, according to the present invention, by inserting a gasket between the aluminum honeycomb shield and the subrack, the contact resistance can be reduced, and the EMI shielding performance can be further improved.
[0053]
Further, according to the present invention, by mounting the aluminum honeycomb shield panel on the frame side, the aluminum honeycomb shield panel can be arranged between adjacent sub-racks without overlapping.
[0054]
Further, according to the present invention, by providing a net-like protective material at the opening of the frame, it is possible to prevent deformation of the aluminum honeycomb shield panel due to external force.
[Brief description of the drawings]
FIG. 1 is an external perspective view showing an attachment structure of an aluminum honeycomb shield panel according to a first embodiment.
FIG. 2 is an exploded perspective view showing a mounting structure of the aluminum honeycomb shield panel according to Embodiment 1.
FIG. 3 is a perspective view showing an attached state of the aluminum honeycomb shield panel according to Embodiment 1.
FIG. 4 is an exploded perspective view showing an attachment structure of an aluminum honeycomb shield panel according to Embodiment 2.
FIG. 5 is a cross-sectional view showing a mounting structure of the aluminum honeycomb shield panel according to the second embodiment.
FIG. 6 is a perspective view showing a mounting structure of an aluminum honeycomb shield panel according to a third embodiment.
FIG. 7 is an external perspective view showing an attachment structure of an aluminum honeycomb shield panel according to Embodiment 4.
FIG. 8 is a perspective view of a conventional electronic device on which a subrack and a fan unit are mounted.
FIG. 9 is a cross-sectional view of a conventional electronic device in which a subrack and a fan unit are mounted.
FIG. 10 is a perspective view of a conventional aluminum honeycomb shield panel.
FIG. 11 is a perspective view of a conventional aluminum honeycomb shield panel unit.
FIG. 12 is a view showing a first step of an assembling step of a conventional aluminum honeycomb shield panel unit.
FIG. 13 is a view showing a second step in the assembling step of the conventional aluminum honeycomb shield panel unit.
FIG. 14 is a view showing a third step of the assembling step of the conventional aluminum honeycomb shield panel unit.
FIG. 15 is a view showing a fourth step of the assembling step of the conventional aluminum honeycomb shield panel unit.
FIG. 16 is a view showing a fifth step of the assembling step of the conventional aluminum honeycomb shield panel unit.
FIG. 17 is an exploded perspective view showing a mounting structure of a conventional subrack aluminum honeycomb shield panel.
FIG. 18 is an external perspective view of a conventional subrack aluminum honeycomb shield panel mounting structure.
[Explanation of symbols]
Reference Signs List 10 subrack, 11 package, 12a, 12b ventilation opening, 13 screw hole, 14 frame, 15 guide rail, 16 cut and raised hole, 17 screw hole, 18 conductive gasket, 19 hole, 20 aluminum honeycomb shield panel unit, Reference Signs List 21 aluminum honeycomb shield panel, 22 frame, 22b frame edge, 22c frame claw, 23 screw through hole, 24 conductive gasket, 25 screw, 26 claw, 27 hole, 28 mesh protective material, 30 rack, 31 fan unit , 32a intake port, 32b exhaust port, 33 mounting frame, 34 screws, 40 front panel, 41 front panel mounting screws.

Claims (4)

A ventilation opening provided in the housing to radiate heat from the electronic device housed inside the housing,
Honeycomb structure shield panel having ventilation performance and electromagnetic wave shielding effect,
In order to shield electromagnetic waves from the ventilation opening, a frame is provided to surround and hold the shield panel of the honeycomb structure from the periphery and to be disposed in the ventilation opening,
The outer dimensions of the honeycomb structured shield panel and the inner dimensions of the frame are selected such that the honeycomb structured shield panel is pressed and bent by the frame. Equipment and devices. The electronic device according to claim 1, further comprising a gasket having conductivity between the shield panel having the honeycomb structure and the frame. The electronic device according to claim 1, further comprising a rack for housing the housing, wherein the frame is attached to the rack. 2. The electronic device according to claim 1, wherein a protective material for protecting the shield panel having the honeycomb structure is attached to the frame.

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