JPH0530080B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Technical Field of the Invention The present invention relates to an electromagnetic wave shielding means for electronic equipment, and particularly to a shield casing whose casing has an electromagnetic shielding effect.

(b) Background of the technology In recent years, with the development of electronic technology, various electronic devices such as computers and input/output devices have come into use, but these electronic devices must be shielded to prevent the influence of external electromagnetic waves. There is a need to.

(c) Prior art and problems The conventional method will be explained below with reference to the side view of FIG. 1.

2. Description of the Related Art Conventionally, as a method of preventing electromagnetic waves from entering a device equipped with electronic equipment from the outside, the device 2 is housed in a shielded room 1 as shown in FIG.

However, since the shield room 1 generally has a large room volume relative to the equipment it accommodates, it cannot be installed compactly, is extremely inefficient in terms of installation space, and has the drawback that it is usually not easy to move the shield room 1. Furthermore, the shielding performance may deteriorate and electromagnetic waves may enter.
It is necessary to check and confirm regularly,
There is a drawback that the number of man-hours required for this is large.

On the other hand, although not shown, a method has also been adopted in which the device housing has a shielding function.

However, in this case, there is a drawback that as the device becomes large, providing a high level of shielding performance to the entire casing is costly.

(d) Purpose of the Invention The purpose of the present invention is to solve the above-mentioned drawbacks, and to provide a shielded casing for electronic equipment that has an electromagnetic shielding effect.

(e) Structure of the invention The present invention provides a front door 22 made of a metal material that can be opened and closed.
, a rear door 23, and openings 4a, 4b, 4c in predetermined parts.
, and peripheral and continuous wire mesh shielding members 1a, 1 for shielding electromagnetic waves are provided at the mating portions of the front door 22 and the rear door 23 and at the openings 4a, 4b, 4c, respectively.
b, 1c, 1d, and 1e are provided, and the apparatus main body 21, which is a shielding case for storing electronic equipment, and a plurality of shielding plates 10b, 10c, and 10d are stretched together with their edges overlapped, so that electromagnetic A shield box part 10 which is formed in a hermetically sealed manner and is connected to one end of a metal conduit 6 that houses the predetermined electronic equipment and introduces an external line cable and a ground cable.
is configured to be installed inside the device main body 21, thereby achieving the objective.

(f) Embodiment of the Invention An embodiment of the invention will be described below with reference to FIGS. 2 to 4. 2 is an exploded perspective view showing an embodiment of the present invention, FIG. 3 is a perspective view showing the shield box portion of FIG. 2, and FIG. 4 is a side sectional view of FIG. 3. The same reference numerals indicate the same objects throughout the figures.

As shown in FIG. 2, the device main body 21 is located on a stationary stand 3 installed on the floor. Device body 2
There are a front door 22 and a rear door 23 before and after the front door 2.
2 is divided into an opening/closing part 22a having an air intake port 4a shielded by a shielding member 1a made of, for example, a continuous wire mesh on the inside, and a detachable part 22b, and a rear door 23 is attached in an opening/closing manner.

Shield members 1b and 1c are attached around the opening/closing part 22a of the apparatus main body 21 and the mating part of the rear door 23, so that when the opening/closing part 22a and the rear door 23 are closed, they are sealed to prevent electromagnetic waves from entering.

In addition, a cooling fan unit 4 is installed in the square hole 4b of the ceiling 24 with a shield member 1d made of, for example, a continuous wire mesh.
It is attached via. An air intake port 4c is provided in the bottom portion 25, and a shield member 1e made of a continuous wire mesh is attached.

As shown in FIG. 3, a shield box section 10 is provided at the bottom of the main body 21 of the apparatus.

As shown in FIGS. 2 to 4, the shield box part 10 is composed of a shield part 10a whose left, right, and rear surfaces are formed of shield-welded steel plates, and shield plates 10b to 10d which shield the top, bottom, and front surfaces. The shield plates 10b to 10d are screwed at their peripheries and sealed to prevent electromagnetic waves from entering.

A filter or relay panel (not shown) is accommodated in the shield portion 10a.

Cable ducts 5a and 5b are provided on both sides of the shield box part 10, and the shield plate 1
A metal conduit 6 through which an external line cable and a ground cable are passed is connected to 0c.

With such a configuration, electromagnetic waves are prevented from entering into the shield portion 10a of the shield box portion 10, so that noise from the outside line cable can be removed.

In addition, the air intake ports 4a, 4c of the device main body 21,
Since the square hole 4b, the opening/closing part 22a, and the rear door 23 have a shielding function by the shielding members 1a to 1e, a shielding effect can be obtained for the electronic equipment (not shown) housed therein.

In this way, the device 2 can be electromagnetically shielded.

(g) Effects of the Invention As explained above, according to the present invention, since the electromagnetic shielding section is provided inside the device housing, there is no need for a shield room, and the device itself has a compact configuration and is easy to move. This not only allows for more efficient use of space, but also eliminates the hassle of regular inspections.

It is economical because there is no need to provide a high level of shielding function to the entire device casing.

Electronic devices such as computers and input/output devices can now be used even under adverse environmental conditions that are affected by electromagnetic waves.

There is an effect.

[Brief explanation of the drawing]

Fig. 1 is a side view showing the conventional method, Fig. 2 is an exploded perspective view showing an embodiment according to the present invention, Fig. 3 is a perspective view showing the shield box part of Fig. 2, and Fig. 4 is the same as Fig. 3. FIG. In the figure, 1 is a shield room, 1a to 1e
2 is a shield member, 2 is a device, 10 is a shield box portion, 10a is a shield portion, 10b to 10d are shield plates, 21 is a main body of the device, 22 is a front door, 22
22b is an attachment/detachment part, and 23 is a rear door.

Claims (1)

[Claims] 1. A front door 22 and a rear door 23 made of a metal material that can be opened and closed, and openings 4a, 4b, and 4c at predetermined portions,
Peripheral and continuous wire mesh shielding members 1a, 1b for shielding electromagnetic waves are provided at the joint portions of the front door 22 and rear door 23 and at the openings 4a, 4b, 4c, respectively.
1c, 1d, and 1e are provided, and an electromagnetic seal is formed by stretching a plurality of shield plates 10b, 10c, and 10d with their edges overlapped, and a device main body 21 that is a shield casing that stores electronic equipment. A shield characterized in that a shield box part 10 is provided inside the device main body 21 to which one end of a metal conduit 6 is connected, which accommodates the predetermined electronic equipment and introduces an external line cable and a ground cable. Housing.