JPH07221483A - Shield structure of electronic equipment - Google Patents

Abstract

PURPOSE:To easily raise the electromagnetic waves shielding effect and besides, lighten the weight of an opening and closing type of door. CONSTITUTION:In the shield structure of electronic equipment in which each kind of electronic equipment units are mounted and also which has at least an opening and closing type of door 11, a movable metallic mesh 10 to cover each kind of electronic equipment unit and a mesh winder 5 to wind the mesh 10 as occasion demands are provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shield structure for electronic equipment, and more particularly to a shield structure for electronic equipment having various electronic equipment units mounted therein and having a releasable door for maintaining the various electronic equipment units. It is about structure.

[0002]

2. Description of the Related Art As shown in FIG. 6, an electronic device 60 has various heat generating type electronic device units 66, 6 inside.
6, etc. (for example, a power supply unit, an oscillator such as a clock signal generator, a high-density printed board) are mounted, and various electronic device units 66, 66 ,.
.. is surrounded by a frame 68.

The various electronic equipment units 66, 66, ... Enclosed by the frame 68 are covered with an outer plate 62 on the outside, and the various electronic equipment units 66, 6 are also provided.
An openable door 61 is provided on the front surface and the back surface in consideration of maintenance of 6, ... (See FIG. 6A).

In the electronic device 60, cooling fans 67 are attached on the upwind side and the leeward side in order to cool the various electronic device units 66, 66, ..., And the various electronic device units 66, 66 ,.・ The heat generated by the operation of the unit is cooled by air cooling.

On the leeward side of the cooling fan 67 on the leeward side, a silencer 64 composed of a silencer is installed to suppress noise from the electronic device 60. 65
Is a foot for installing the electronic device 60 on the floor.

In order to protect these various electronic equipment units from external electromagnetic waves, a shield packing 69 is provided over the entire edge of the outer plate 62 so that not all electronic equipment units have an electromagnetic wave shield structure but a final structure. Outer plate 62
It has a structure that shuts off.

Reference numeral 63 is a punching metal made of metal and installed on the ceiling of the electronic device 60. FIG. 7 shows a state in which the door 61 of the electronic device 60 configured as described above is in an open state. As is apparent from FIG. 7, when a case where the electronic device unit is maintained occurs,
The door 61 is opened to replace various electronic device units.

[0008]

However, in the conventional structure, the electromagnetic wave shielding effect is halved unless a structural gap is formed in the contact portion between the electronic device and the outer plate.

The openable and closable doors are repeatedly opened and closed, and the shield packing deteriorates with the lapse of time, resulting in a gap between the door and the frame. In addition, the opening / closing door must be light in some cases because it must be removed for maintenance work. Therefore, it is difficult for the opening / closing door to adopt a structure for further improving the electromagnetic wave shielding property. Further, as the performance of electronic devices has become higher, the electromagnetic waves generated from the electronic devices have become higher in frequency (the higher the frequency, the easier it is to leak from structural gaps smaller than the electromagnetic waves), which is very costly. Therefore, it is difficult to adopt a complete electromagnetic wave shield structure for each electronic device unit.

For these reasons, electromagnetic waves (noise) generated from various electronic devices and electromagnetic waves (noise) from the outside cannot be reduced only by the outer plate. Therefore, it is an object of the present invention to easily enhance the electromagnetic wave shielding effect without causing a significant increase in cost.

[0011]

[Means for Solving the Problems] The above object is to provide an electronic device 1.
In a shield structure of an electronic device in which various electronic device units 3 are mounted inside and at least an opening / closing door 11, a movable metal mesh 10 that covers the various electronic device units 3 and the mesh 10 are provided. And a mesh take-up part 5 for taking up as necessary. The electronic device 1 is composed of a first frame 8 and a second frame 9. It has a double structure, and the mesh winding section 5 is formed in a space between the first frame 8 and the second frame 9.
3. The shield structure for an electronic device according to claim 2, wherein the mesh 5 is closely attached to the second frame 9 by a conductive sheet 13, and the shield structure for an electronic device according to claim 2. An active silencer is formed on the exhaust side of the electronic device 1, which can be achieved by the shield structure of the electronic device according to claim 1, 2 or 3.

[0012]

That is, according to the present invention, it is possible to easily shield an electromagnetic wave without adopting a method of applying an electromagnetic wave shield structure to each electronic equipment unit inside an electronic equipment which is expensive. Is.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described in detail below with reference to the drawings. The same reference numerals in FIGS. 1 to 5 indicate the same objects.

First, a first embodiment of the present invention will be described with reference to FIGS. As shown in FIGS. 1 and 2, the electronic device 1 has various heat generating type electronic device units 3, 3, ... (For example, a power supply unit, an oscillator such as a clock signal generator, a high-density printed circuit). A board is mounted, and the various electronic device units 3, 3, ... Are surrounded by a second frame 9.

The various electronic equipment units 3, 3, ... Surrounded by the second frame 9 are surrounded by the first frame 8 on the outer side thereof, and the outer side of the first frame 8 is covered by the outer plate. 6, and an opening / closing door 11 is provided on the front surface and the back surface in consideration of maintenance of various electronic device units 3, 3 ,. Similarly, see FIG. 6 (a)).

The other outer plates 6 of the electronic device 1 except the openable door 11 are completely shielded by a metal plate for electromagnetic wave shielding. In the electronic device 1, fan units 4 are attached on the upwind side and the leeward side in order to cool the various electronic device units 3, 3 ,. The heat generated by the unit is cooled by air cooling.

On a further leeward side of the fan unit 4 on the leeward side, a muffler 7 made of a muffling material is installed in order to suppress noise from the electronic device 1. Reference numeral 2 is a foot for installing the electronic device 1 on the floor.
Is a top plate and is punching metal as in the past.

A metal mesh 10 is attached so as to cover the outside of various electronic device units 3, 3, ... That are exposed by opening the openable door of the electronic device 1.

The mesh 10 is freely movable in the direction perpendicular to the floor surface, and is, for example, the electronic device unit 3,
When maintaining 3, ..., this mesh 1
Since 0 interferes with the work, the mesh winding section 5 provided between the first frame 8 and the second frame 9 can wind the mesh as needed.

The mesh winding portion 56 is in a state in which tension is constantly applied in the direction of the central axis of the mesh 10 so that the mesh 10 can be wound in a roll shape. Therefore, the mesh is particularly the first frame 8 or the second frame 9. The mesh 10 is wound up by the mesh winding section 5 as long as the mesh 10 is not fixed.

Therefore, a hook (not shown) is provided at the tip of the mesh so that the mesh 10 will not be carelessly taken up by the mesh take-up section 5, and the first frame 8 or the second frame 9 is also shown in the same manner. A protrusion is provided so that the mesh 10 can be caught.

Reference numeral 12 is a support base for supporting the shaft of the mesh winding section 5 for winding the mesh 10 into a roll. The generation of a gap between the mesh 10 and the frame must never occur under the condition of shielding electromagnetic waves.

Therefore, in this embodiment, as shown in FIG.
In order to prevent a gap from being formed between the second frame 9 and the mesh 10, the mesh 10 is made of a metal conductive sheet.
Are bonded to the second frame 9. However, if the adhesive strength is too strong, it may be a hindrance when the mesh 10 is wound up. Therefore, it is sufficient if the meshing can be adhered to the extent that it does not hinder the winding up of the mesh.

The first embodiment has been described above.
In recent years, there has been a demand for miniaturization and high performance of electronic devices, but in order to satisfy these demands, high-density mounting is increasing. Due to this, the noise of the cooling fan tends to increase. However, as the installation environment is shifting from a computer-only room to an office environment, there is a further demand for a significant reduction in noise generated from the device.

On the other hand, although an active noise device has been devised in recent years, when it is applied to an electronic device (to reduce the noise generated by the disturbance of the flow of the air exhausted from the cooling fan), the cooling fan is used. Before discharging the exhausted air to the outside of the device, it is necessary to have a structure in which it passes through a duct which is long for a certain length.

This is because the noise generated as shown in the silencing principle of the active muffler 17 in FIG. 5 is sampled by the microphone 14, converted into an electric signal, and is of a phase opposite to the noise emitted from the speaker 15. Since it takes time for the signal to be calculated by the processing unit 18, the length of the duct 16 must be set according to the calculation time.

Therefore, there is a drawback that the size of the electronic device is increased only to secure the duct length. The second embodiment shown in FIG. 4 is caused by adopting the active silencer, which is most effective for noise reduction, in the electronic apparatus of the present invention while solving this drawback.

In other words, as described in the first embodiment, the mesh winding section 5 provided between the first frame 8 and the second frame 9 does not necessarily require all the space. A duct 16 for an active silencer (active silencer) is provided in this dead space (air exhaust port).

By adding a sound deadening material to the duct 16, the sound deadening effect can be efficiently and effectively performed.

[0030]

As described above, according to the present invention, it is possible to reduce the electromagnetic wave radiation to the outside of the device without taking a perfect electromagnetic wave shield measure for each electronic equipment unit, power supply / signal cable and the like. .

Therefore, the cost can be remarkably reduced and the assembling work and the maintenance work are not impaired. Further, there is an effect that the influence of electromagnetic noise from the outside of the device can be eliminated.

[Brief description of drawings]

FIG. 1 is a diagram showing a first embodiment of the present invention.

FIG. 2 is a diagram showing a cross-sectional view taken along line AA.

FIG. 3 is an enlarged view of FIG.

FIG. 4 is a diagram showing a second embodiment of the present invention.

FIG. 5 is a diagram showing a silencing principle of an active silencer.

6A and 6B are views showing a conventional example, FIG. 6A is a top view, FIG. 6B is a front view, and FIG. 6C is a sectional view.

FIG. 7 is a diagram showing a door open state.

[Explanation of symbols]

 1 electronic device, 3 various electronic device units, 5 mesh winding section, 6 outer plate, 8 first frame, 9 second frame, 10 mesh, 11 door, 13 conductive sheet, 17 active silencer,

Claims (4)

[Claims] 1. A shield structure for an electronic device, wherein the electronic device (1) has various electronic device units (3) mounted therein and at least has a door (11) that can be opened and closed. A shield structure for an electronic device, comprising: a movable metal mesh (10) for covering the mesh, and a mesh winding section (5) for winding the mesh (10) as necessary. 2. The electronic device (1) has a double structure composed of a first frame (8) and a second frame (9), and the first frame (8) and the second frame (9). The shield structure for an electronic device according to claim 1, wherein the mesh winding section (5) is formed in a space between the frame and the second frame (9). 3. The shield structure for an electronic device according to claim 2, wherein the mesh (5) is closely attached to the second frame (9) by a conductive sheet (13). 4. The shield structure for an electronic device according to claim 1, wherein an active silencer is formed on the exhaust side of the electronic device (1).