JPH0126145Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a casing for an electronic device such as an electric field strength measuring device, and particularly relates to the casing structure thereof.

In this type of electronic equipment, in order to prevent equipment malfunctions caused by pulse noise, the outer panel of the device housing is made of a conductive metal plate such as an aluminum plate, and multiple outer panels are It is necessary to reliably cover the bonding surfaces between adjacent outer panels with an electric conductor, thereby providing the casing with electric field shielding properties.

Here, three examples of methods for forming the joint between outer panels in a conventional housing structure will be explained with reference to FIGS. 1 to 3. 5 shows the joints between the left edge of 5 and the upper edges of left side plates 2, 3, and 4 of the housing.

A first method (see Fig. 1) A bent flange portion 1a is formed on the left edge of an upper plate 1 made of an aluminum plate as a conductive plate, and
Upper end 2 of side plate 2 made of aluminum plate as a conductive plate
a is fitted into the back surface of the flange portion 1a and is fastened to the flange portion 1a by mounting screws 8, and the upper plate 1 and the side plate 2 are in contact with each other on their conductive surfaces.

Further, after this assembly, the outer surface of the casing is insulated, that is, the surface of the top plate 1 and the surface of the side plate 2 other than the upper end 2a are coated with paint coatings 6 and 7, respectively. There is.

By the way, with this joining method, the painting process after forming the aluminum plate is troublesome.
Compared to using a conductive plate with an insulating coating on one side of a conductive metal plate (hereinafter referred to as a colored conductive plate) as the outer plate, it is inevitable that the cost will be higher.
In addition, during painting, paint may enter the joint surface from the corner of the lower edge of the brim 1a, or unpainted areas may occur at the upper corner of the coating 7 of the side plate 2, resulting in poor conductivity on the joint surface or damage to the outer surface of the joint. There is a drawback that insulation failure is likely to occur.

Note that if a colored conductive plate is used in this method, the insulating coating on the upper end 2a of the side plate 2 must be peeled off after molding, so it is impractical in terms of processing.

Second method (see Figure 2) In this method, colored conductive plates are used for each of the top plate 5 and side plate 3, and the surfaces of each plate 5, 3 are
Insulating coatings 5a and 3a are applied in advance, respectively.

Therefore, the left edge of the upper plate 5 has a bent flange portion 5b.
On the other hand, on the back side of the upper end portion 3a of the side plate 3, a longitudinal conductive shield plate 9 with an L-shaped cross section is formed.
The lower end portion of the upper plate 5 is fixed by a fixing screw 10, and the upper plate 5 is fastened to the horizontal portion of the shield plate 9 by the mounting screw 8 with the collar portion 5b butting against the upper end portion 3b of the side plate. ing.

In this state, the conductive surface on the inner surface of the top plate 5 and the conductive surface on the inner surface of the side plate 3 are in contact with the shield plate 9, respectively, so that the butt joint between the top plate 5 and the side plate 3 is It is reliably covered by the shield plate 9.

By the way, according to such a method, the shielding property and the external insulation property of the joint part are good, and there is no need for painting after molding, but the number of parts such as the fixing screw 10 and the shield plate 9 increases, In addition, there is a drawback that the assembly process requires many man-hours, resulting in high costs.

Third method (see Figure 3) In this method, like the first method, after molding the top plate 1 and side plate 4 made of aluminum plates,
The surface of the casing is painted, but the side plate 4
In the molding process, the upper end portion 4a becomes a stepped portion that is retracted to the back side by the thickness of the plate by bending, and the collar portion 1a of the upper plate 1 is formed by bending the upper end portion 4a.
It is fastened to the side plate 4 with mounting screws 8 in a state where it is circumscribed and overlapped with a.

Next, in the painting process, painting is performed after masking the surface of the upper end portion 4a, thereby forming a paint film 11 on the surface of the side plate 4 except for the upper end portion 4a.

However, with the lever method, the shielding performance of the joint and the external insulation are good, and the component cost is low, but
However, because masking painting is expensive,
The disadvantage is that processing costs are high.

The present invention was devised to solve the above-mentioned problems.In other words, the purpose of the present invention is to reduce the manufacturing cost and provide good shielding properties and external insulation properties to the joints of the outer panels. An object of the present invention is to provide a housing for electronic equipment that can be used for electronic devices.

As a means to achieve that objective, the housing of the present invention has at least two adjacent housing outer panels,
The other outer plate is formed of a conductive plate having an insulating coating provided on the surface of the conductive metal plate, and a bent collar is formed on an adjacent edge of the one outer plate, and the other outer plate is fitted into the collar. A folded part formed into a folded double plate and extending on the front side is formed on the adjacent edge of the collar, and the conductive surface on the back side of the collar part is connected to the conductive surface extending on the other surface insulating film side. It is characterized by being fixed.

Hereinafter, the present invention will be explained based on an illustrated embodiment.

FIGS. 4 and 5 show an exemplary housing for an electric field strength measuring instrument, which has six outer panels,
That is, it is assembled by symmetrical upper and lower plates 14 and 15, symmetrical left and right side plates 16 and 17, and a front plate 18 and a rear plate 19. A decorative board 20 forming the outer panel is fixed with screws, and each of these outer panels is a colored aluminum plate as a colored conductive plate, that is, a pressed colored aluminum plate with an insulating paint film formed on one side by roller application. It is manufactured by molding, and is molded with the insulating coating facing toward the front.

Therefore, the joint structure between the ends of the two outer panels constituting the housing is such that, for example, at the joint between the top panel 14 and the left side panel 16, a painted insulating coating 14a is applied as shown in FIG. A downward flange 14b is formed on the upper plate 14, which is one conductive metal outer plate, with the insulating coating 16a facing up, and the upper end of the other side plate 16, which is the other conductive metal outer plate, with the insulating coating 16a facing up. The upper end of the side plate 16 is first folded inward by twice the plate thickness at right angles to form a retractable stepped portion 16b. Furthermore, a folded part 16d is formed from the tip of the rising part 16c which rises by the depth of the upper plate flange part 14b, which is folded back to the front side and overlaps with the rising part 16c.

When the upper plate 14 is assembled, the flange 14b of the upper plate 14 is fitted onto the outer surface of the folded portion 16d and is fastened onto the stepped portion 16b by the mounting screws 13. Since the conductive surface is exposed on the outer surface of the folded portion 16d, the upper plate 14
and side plate 16 are in close contact with each other with their conductive surfaces in contact with each other.

In the case of the embodiment configured in this way, among the multifaceted outer panels forming the casing, the joints between adjacent outer panels are the flange portion 14b and the folded portion 16.
They are joined by the close contact of the conductive surfaces d, and since the inside of the abutting portion between the collar portion 14b and the side plate 16 is closed, the joint portion is reliably shielded from the electric field by the conductor.

Furthermore, with this structure, there is no need to perform troublesome painting or peeling of the pre-formed insulating coating after forming the outer panel, so there is no sagging or chipping of the insulating coating, and as a result, The insulation of the outer panel surface is maintained well, and the manufacturing cost of the casing is low because it requires only simple processing, such as press working.

In addition, since the edge of the outer plate on the side that fits inside is folded back twice, the shape rigidity of the mating part is strengthened. Since the portion is rounded, there are no burrs or the like, and the insertion operation during fitting is smooth and easy.

As described above, according to the electronic device casing according to the present invention, the joint end of one of the two adjacent outer panels made of a conductive plate having an insulating film on the surface is Along with forming the folded brim,
At the joint end of the other outer panel, there is a 2 piece that fits inside the same collar part.
By molding the double folded part so that the joint is formed by contacting the conductive surface, it is possible to completely cover the casing with the conductor, which gives the casing good shielding properties. In addition, the casing is easier to manufacture and the structure is more robust.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional perspective view of a joint between outer panels in a first example of a conventional housing structure, and FIGS. 2 and 3 show joints between outer panels in a second and third example, respectively. FIG. 4 is a perspective view of an electronic device casing showing an embodiment of the present invention, FIG. 5 is an exploded view of FIG. 4, and FIG. FIG. 14... Upper plate as one outer plate, 14a, 1
6a...Insulating coating, 14b...Brim part, 16...
Side plate as the other outer plate, 16d... folded part.

Claims (1)

[Scope of utility model registration request] In an electronic device casing formed by combining a plurality of outer panels, at least two of the outer panels that are adjacent to each other are formed of conductive plates having an insulating coating provided on the surface of a conductive metal plate. A folded collar is formed on the adjacent edge of the one outer panel, and the adjacent edge of the other outer panel that is fitted into the collar is folded back to the front side to form a double plate. 1. A casing for an electronic device, wherein an edge is formed, and a conductive surface on the back surface of the flange portion and a conductive surface of the folded portion extending toward the other surface side are connected and fixed.