JPH0410593A - Case of electronic equipment - Google Patents

Abstract

PURPOSE:To enhance a case in shielding effect by increasing contact points in number without increasing screws in number by a method wherein a metal member is actively electrically connected to another metal member to which it is brought into close contact taking advantage of burrs induced on the fractured face of the metal member concerned at a press processing. CONSTITUTION:A circuit board 2 is shielded by a case composed of a chassis 1, a cover 3, and others so as to prevent electromagnetic noises from the operating circuit board 2 mounted on a chassis 1 from being transmitted outside. Extra holes 5 other than the tapped holes are provided to the chassis 1. The extra hole 5 is arranged between screws 41 and 42, whereby electrical contact points can be increased in number. By this constitution, screws 4 can be lessened in number keeping the electrical contact points unchanged in number and an assembly operation can be decreased in man-hours.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a housing of an electronic device formed to block electrostatic noise or electromagnetic interference.

[Conventional technology]

FIG. 5 is an external view of a conventional electronic device housing configured to block, for example, electromagnetic interference or electrostatic noise.

In the figure, (1) is a chassis on which a circuit board (2) is mounted, (3) is a cover that covers the chassis (1), and is screwed together with the chassis (1) using screws (4).

Next, the shielding effect of the casing with the above configuration against electromagnetic noise and the like will be explained. When the circuit board (2) mounted on the chassis (1) operates, it generates electromagnetic noise. In order to prevent this from being emitted to the outside, it is effective to shield it with a cover (3). . Electrical contact between the chassis (1) and cover (3) is key to increasing the shielding effect. Therefore, the shielding effect is achieved by narrowing the interval between the screws (4) (usually 50 mm pitch) and increasing the number of screws installed to increase the number of electrical contact points. In other words, this figure shows that by increasing the number of screws, the circuit board (2) inside the electronic device can be
This prevents electromagnetic interference noise or electrostatic noise generated from leaking to the outside, as well as preventing electromagnetic noise or electrostatic noise from entering from the outside.

[Problem to be solved by the invention] Is the case of a conventional electronic device configured as described above to improve the shielding effect to block electromagnetic interference noise or electrostatic noise, or is it possible to improve the shielding effect even more? This increases the number of screws for threading the cover and chassis together, which increases the number of processing steps and increases the number of assembly steps.

This invention was made to solve the above problems, and it increases the number of contact points without increasing the number of screws.
The purpose of the present invention is to obtain a housing for electronic equipment that can enhance the shielding effect.

(Means for Solving the Problems) A housing for an electronic device according to the first invention includes a pair of closely spaced metal members forming the housing, in which at least one metal member is subjected to a firming process, and the The metal member is formed in close contact with the other metal member via the metal member.

Further, in the electronic device casing according to the second invention, at least one of the pair of closely spaced metal members forming the casing is provided with a protrusion, and the metal member is inserted through the protrusion. It is formed in close contact with the other metal member.

[Function] According to the first aspect of the present invention, electrical conduction is actively established with the mating metal member that is brought into close contact with the burr on the fracture surface generated in the metal member during press working.

Further, according to the second invention, among a pair of metal members that are brought into close contact, a protrusion is provided at an arbitrary position on one of the metal members to actively establish electrical continuity with the other metal member that is brought into close contact with each other. do.

(Example) Hereinafter, an example of the first invention will be described with reference to the drawings. In FIG. 1, (1) is a chassis, (2) is a circuit board, (3) is a cover, (4) is a screw, and (5) is a hole with a burr left. FIG. 2 is a diagram illustrating the function of the hole (5).

Next, a method for improving the shielding effect according to the configuration of this casing will be described. The circuit board (2) mounted on the chassis (1) generates NFa wave noise by operating. In order to prevent this from coming out, it is effective to shield the circuit board (2) with parts that make up the housing, such as the chassis (1) and the cover (2).

In the conventional example, the number of screws (4) was increased in order to increase electrical contact, but in the present invention, in addition to the screw holes, a waste hole (5) is provided. Stable electrical contact can be obtained by pressing the hole (5) from the direction in which burrs appear on the mating component side. As shown in Figure 2, screws (41
) and the screw (42) by placing a sacrificial hole (5) to increase the electrical contact points. In this embodiment, one hole (5) is provided between the screw (41) and the screw (42), but the present invention is not limited to this, and a plurality of holes (5) may be arranged. Needless to say, it's a good thing. With this configuration, the number of screws (4) can be reduced while maintaining the same number of points for maintaining electrical contact, thereby reducing the number of assembly steps.

In addition, in the above embodiment, the hole (5) was made into a round hole, or
It may be a square hole or may have a shape such as a square hole, but is not limited to this. Furthermore, it is clear that the present invention can be applied even if there is a notch instead of a hole.

In the above embodiment, the number of electrical contact points was increased by actively utilizing the elasticity of the round hole made in the chassis (1), or the method of the second invention shown in FIGS. 3 and 4 was adopted. The same effect can be achieved.

An embodiment of the second invention will be described below. In Figure 3, (1) is the chassis, (2) is the circuit board, and (3) is the chassis.
) is a cover, (4) is a screw, and (5a) is a protrusion. FIG. 4 is a diagram illustrating the function of the protrusion (5a).

Next, a method of improving the shielding effect according to this embodiment will be explained. The circuit board (2) mounted on the chassis (1)
) generates electromagnetic noise when it operates. In order to prevent this from coming out, it is effective to shield it with parts that constitute the chassis (1) and the cover (2).

In the conventional example, the number of screws (4) was increased in order to increase the number of electrical contact points, but in this invention, in addition to the screw hole, a protrusion (5a) is used.
has been established. Stable electrical contact can be obtained by pressing the protrusion (5a) from the direction in which the protrusion appears on the mating component side. As shown in Figure 4, screws (4
1) and the screw (42), the electrical contact points can be increased. In this embodiment, one protrusion (5a) is provided between the screw (41) and the screw (42).
Although one example has been shown, it goes without saying that the invention is not limited to this example and that a plurality of protrusions (5a) may be arranged.

With this configuration, the number of screws (4) can be reduced while maintaining the same number of points for maintaining electrical contact, and the number of assembly steps can be reduced.

In the above embodiment, a part of the chassis (1) is curved to form the protrusion (5a), but the protrusion may be formed by punching or drawing, and is not limited to this. There may be.

[Effects of the Invention] As described above, according to the present invention, a convex portion is locally provided on the contact surface of one of the metal members in close contact with each other, and each metal member is connected through the convex portion. By adopting a method of bringing them into close contact, it is possible to increase the number of electrical contact points of each metal member without increasing the number of screw fixing points, which has the effect of reducing the number of man-hours for processing and assembling the casing. .

[Brief explanation of drawings]

FIG. 1 is a configuration diagram of a casing of an electronic device according to an embodiment of the first invention, FIG. 2 is a diagram illustrating burr holes made in the chassis of this embodiment, and FIG. FIG. 4 is a diagram illustrating a protrusion provided on the chassis in this embodiment, and FIG. 5 is a diagram illustrating the configuration of a conventional electronic device casing. . In the figure, (1) is the chassis, (2) is the electronic circuit board, (3) is the cover, (4) is the screw, (5) is the hole, (5a
) is a protrusion. In each figure, the same reference numerals indicate the same or corresponding parts.

Claims (2)

[Claims] (1) In a case of an electronic device in which a pair of metal members are formed in close contact with each other, at least one of the metal members that are brought into close contact is subjected to burr processing, and the metal member is brought into close contact with the other metal member through the burr. An electronic device housing featuring: (2) In a case of an electronic device in which a pair of metal members are formed in close contact with each other, at least one of the metal members that are brought into close contact is provided with a protrusion, and the metal member is brought into close contact with the other metal member through the protrusion. An electronic device housing characterized by: