JPH0648955Y2 - Electronic device cover - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a cover for closing an opening of an electronic device, and more particularly to an electronic device cover suitable for use in an electronic circuit module equipped with an electronic circuit cover.

[Conventional technology]

Generally, in an electronic device, various electronic components and electronic circuits are provided inside a metal chassis, and an opening thereof is covered with a cover. Conventionally, this type of cover is formed of a metal such as aluminum or plastic, and the like to reduce the influence from the outside by sealing the inside of the electronic device with this cover.

[Problems to be solved by the invention]

Among the conventional electronic device covers described above, those made of metal are heavy in terms of general characteristics, are expensive, and have the disadvantages that the inside cannot be seen. Furthermore, since it is a conductor in terms of electrical characteristics, there is a problem that induced noise affects the electronic circuit and the cable adjacent to the cover due to, for example, electrostatic discharge.

On the other hand, those made of plastic are more advantageous than metals in terms of general characteristics, but have a problem in terms of electrical characteristics that they cannot deal with EMI interference (electromagnetic interference) in addition to static electricity.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above problems and provide an electronic device cover with improved general and electrical characteristics.

[Means for solving problems]

In the electronic device cover of the present invention, the cover attached to the opening of the metal chassis in which the electronic parts, the electronic circuit, etc. are built is integrally formed of the wire mesh and the transparent plastic, and the inner surface thereof is , Expose the wire mesh only in the peripheral part with a width corresponding to the opening edge of the metal chassis, and cover the other part with plastic, and when exposed to the opening of the metal chassis, the exposed part of the wire mesh and the chassis The opening edge and the opening edge are in direct contact with each other to electrically connect them.

〔Example〕

 Next, the present invention will be described with reference to the drawings.

1 to 3 are views showing an embodiment of the present invention.
That is, as shown in FIGS. 1 and 2, here, an electronic device in which a plurality of electronic circuit cards 2 are housed in a metal chassis 1 is shown, and a cover 3 is provided in an opening of the metal chassis 1. It is adhered to seal the inside of the chassis 1.

As shown in the sectional structure of FIG. 3, the cover 3 is formed by sandwiching a metal net 4 with plastics 5a and 5b and integrally molding the wire mesh 4 into a predetermined shape. And
In this example, the wire netting 4 is exposed at the four sides, and the exposed portion 4a of the wire netting 4 is bent in the direction of the arrow in the figure to extend along the circumference of the inner surface of the cover 3.

The cover 3 having this structure is attached to the opening of the metal chassis 1 as shown in FIGS. 1 and 2 by using a stopper such as a stopper or a lock nut (not shown). The exposed portion 4a of the wire net around the four edges of 3 is attached in a state of being aligned with the opening edge of the metal chassis 1. As a result, the metal chassis 1 and the wire net 4 are electrically connected to each other to ground the wire net 4, that is, the cover 3, so that the electronic circuit card 2 in the chassis 1 can be electrically and magnetically shielded.

Therefore, according to this cover, since the metal portion has the wire mesh structure, it is possible to reduce the weight and obtain the shielding effect equivalent to that of the metal cover, and to prevent static electricity problems and
Can solve EMI problems at the same time. Further, by forming the plastic sandwiching the wire mesh with a transparent material, the cover 3 can be provided with transparency, and it is possible to confirm the internal display inside the device and the lighting of the LED from the outside. In this case, since it is plastic, the degree of smoke (transparency) can be freely set.

Furthermore, the cover can be manufactured freely and can be manufactured at low cost.

Here, the exposed portion 4a of the wire mesh is left unbent, and by forming a part of the front surface of the cover 3 with this portion, the ventilation of the wire mesh is used to allow air to flow into the chassis. It is also possible to perform cooling by.

FIG. 4 is a view showing another embodiment of the present invention, in which one of the plastics 5b sandwiching the wire netting 4 is removed at the peripheral portion so that the peripheral portion 4a of the wire netting 4 is exposed. I am configuring. With this configuration, it is not necessary to bend the exposed portion 4a of the wire netting 4, and it is possible to conduct electricity to the opening edge portion of the metal chassis 1 as it is.

It goes without saying that the same effect as that of FIG. 1 can be obtained in the example of FIG. 4 described above.

The metal net does not necessarily have to have a structure in which metal wires are braided, and may be, for example, a polystyrene net plated with metal.

Here, the above embodiment describes the basic part, but it goes without saying that the present invention can be applied to a large system by building up the basic part with the same idea.

[Effect of device]

As described above, according to the present invention, the cover attached to the opening of the metal chassis is formed by integrally forming the wire mesh and the transparent plastic, and the inner surface of the metal chassis is only in the peripheral portion. The wire mesh is exposed with a width corresponding to the opening edge of the metal wire, and the other parts are covered with plastic. Since it is electrically conducted, the opening of the metal chassis can be shielded by a wire mesh simply by attaching the cover to the metal chassis, and the static effect is generated through the shielding effect equivalent to the conventional metal cover. It is possible to improve electrical characteristics such as solving EMI problems at the same time. Also, the state inside the device can be confirmed from outside the device through the transparent plastic. In addition, the wire mesh is exposed only on the periphery of the inner surface of the cover, and the other parts of the inner surface are covered with plastic, preventing electronic components in the metal chassis from contacting the wire mesh and causing an electrical short circuit accident. The effect that can be obtained is also obtained.

[Brief description of drawings]

FIG. 1 is an external perspective view of an electronic device to which the cover of the present invention is applied, FIG. 2 is a perspective view with the cover removed, FIG. 3 is a sectional view of the cover, and FIG. FIG. 1 ... Metal chassis, 2 ... Electronic circuit card, 3 ...
Cover, 4 ... wire mesh, 4a ... exposed part, 5a, 5b ... plastic.

Claims (1)

[Scope of utility model registration request] 1. An electronic device cover for sealing the inside of an electronic device by covering the inside of an electronic device by covering the opening of a metal chassis containing electronic parts, electronic circuits and the like, wherein the cover is made of a wire mesh and a transparent plastic integrally. On the inner surface of the metal chassis, the wire mesh is exposed only at the peripheral portion thereof with a width corresponding to the opening edge of the metal chassis, and the other portion is covered with plastic and attached to the opening of the metal chassis. An electronic device cover, characterized in that the exposed part of the wire mesh and the opening edge of the chassis are brought into direct contact with each other so as to electrically conduct the two.