JPH04105398A - electronic equipment housing - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to electronic equipment such as video equipment and audio equipment such as television receivers and video tape recorders, and particularly to electronic equipment characterized by a structure that shields the casing. It is related to.

[Conventional technology]

In recent years, with the diversification of electronic devices, it has become necessary to take effective measures against noise radiated from electronic devices and noise generated from power lines. As a countermeasure against this problem, shielding the casing of the electronic device is carried out. FIG. 3 is a perspective view showing an example of the structure of a conventional electronic device. In this figure, a chassis 1 is provided with an auxiliary chassis 2 on its back surface. The upper end of the auxiliary chassis 2 is bent into an L-shape and has a plane part 2a parallel to the plane part of the upper lid 3.

A bottom cover 4 is attached to the bottom surface of the chassis 1. Here, a cover ring is usually provided near the screw attachment holes of the top cover 3 and bottom cover 4. The cover ring has a structure in which the lid is recessed toward the chassis side so that the heads of the screws do not protrude from the lid when the top lid 3 and the bottom lid 4 are fixed to the chassis with screws. FIG. 4 is a perspective view showing another example of a conventional electronic device, in which an auxiliary chassis 2 is attached to a chassis 5 having a U-shaped cross section. In this case, the bottom cover 6 has a cross-sectional shape having side plates 6a and 6b, and the screw hole of the top cover 3 and the screw hole of the bottom cover 6 are brought into contact with each other and screwed together to form a casing. ing.

However, in such conventional electronic devices, the top cover and bottom cover are fixed to the chassis using a cover ring, so the contact area between the top cover, bottom cover, and shear is limited to an extremely narrow area around the car cover ring. That will happen. Therefore, even if the metal top cover 3 and bottom cover 4 are used, there is a drawback that the electronic equipment cannot be sufficiently shielded.

Therefore, as shown in FIG. 5, which is a cross-sectional view of the upper surface 2a of the rear auxiliary chassis 2 and the flat plate portion of the top cover 3, the flat surface 2a of the auxiliary chassis 2 has a large number of protrusions whose sides are curved in an arc shape. A configuration is conceivable in which a metal spring 7 is provided and the chassis 2a and the top cover 3 are brought into contact via the metal spring 7 when the top cover 3 is fixed. With such a structure, the inner upper surface portion of the upper cover 3 and the chassis can be brought into contact with each other with low impedance.

[Problems to be Solved by the Invention] However, when a metal spring is provided on the top surface of the auxiliary chassis and brought into contact with the top lid 3 in this way, it is possible to bring the metal spring into contact with the flat part of the upper M3 at a low impedance;
There was a drawback that the side surface of the top cover 3 could not be brought into sufficient contact with the chassis.

The present invention has been made in view of the problems with the shield structure of conventional electronic N-units, and it is an object of the present invention to enable electrical contact between the inner surface of the top cover and the chassis at low impedance. is a technical issue.

[Means for Solving the Problems] The present invention provides a casing for an electronic device including a top lid having a side plate portion, the casing having a screw groove attached to either the side wall of the bottom cover or the bottom lid of the electronic device. It is characterized in that it has a conductive flat rubber fixed in between, and is attached with the inner surface of the top cover in contact with the conductive flat rubber.

(Function) According to the present invention having such features, conductive flat rubber is brought into contact with the side wall of the chassis or bottom plate of the electronic device parallel to the side wall except for the screwed part, and when the top cover is attached, The inner wall and the chassis or the bottom plate are screwed together and the conductive flat rubber is deformed and attached.In this way, the top cover can be brought into contact with the chassis or the bottom cover with low impedance.

〔Example〕

FIG. 1 is a side view showing the configuration of the main parts of an electronic device according to an embodiment of the present invention. In this embodiment as well, the same parts as in the conventional example are given the same reference numerals.

In this embodiment, the bottom cover 6 has a U-shape as shown in FIG. A conductive flat rubber 10 is pasted on. The conductive flat rubber IO may be bonded using a conductive adhesive, and as shown in Fig. 1, a U-shaped depression is provided in the center using a screw 11, and the screw is fixed therein. You can also screw it in place. When the top cover 3 is attached, the conductive flat rubber 10 is pressed as shown in the figure, so that it can be connected to the bottom cover 6 at low impedance.

Further, FIG. 2 shows the main part of another embodiment of the present invention,
A thin slit is provided between the screw grooves 6C and 6d and 6e and 6'' in the bottom cover 6, and a metal hand is inserted as shown in the figure. The conductive flat rubber is fixed by bending.In this case as well, when the top cover 3 is fixed, the bottom cover and the top cover can be connected with low impedance by deforming the conductive rubber 10.

Although each of the above-mentioned embodiments describes an electronic device having a bottom cover 6 having a U-shaped cross section, when the side surface of the chassis and the top cover 3 are fixed with screws as shown in FIG. A similar effect can be obtained by attaching a conductive rubber between the thread grooves on the side surface of the l.

[Effects of the Invention] As described above in detail, according to the present invention, when attaching the top cover, a flat conductive rubber is fixed between the screw holes in which grooves are formed by the side wheels of the bottom cover, chassis, etc. By deforming the top cover to the bottom cover and the chassis, electrical connection between the top cover and the bottom cover and the chassis can be ensured. Therefore, high frequency impedance can be lowered, shielding effect can be improved, and radiation noise can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a partial sectional view showing a connection state between a top cover and a bottom cover according to an embodiment of the present invention, and FIG. 2 is a partial sectional view showing a connection state between a top cover and a bottom cover according to a second embodiment of the invention. , FIG. 3 is an assembled configuration diagram of a conventional electronic device, FIG. 4 is an assembly configuration diagram showing another example of a conventional electronic device, and FIG. 5 shows a structure for electrically connecting the rear auxiliary chassis and the top cover. FIG. 1.5--Chassis, 2--Auxiliary chassis, 3--Top lid, 4,6--Bottom lid,
10----- conductive flat rubber, 11----
-Screw 12---m=・-Metal hand. Patent applicant Matsushita Electric Industrial Co., Ltd.

Claims (1)

[Claims] (1) A casing for an electronic device that includes a top cover having a side plate, and a conductive flat plate fixed between a screw groove attached to either the side wall of the chassis of the electronic device or the bottom cover. 1. A casing for an electronic device, comprising rubber, and the top cover is attached with the inner surface thereof in contact with conductive flat rubber.