JPH02276295A - Exterior case for electronic equipment - 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 an exterior case for an electronic device, and in particular, to an exterior case for an electronic device, in particular, the invention relates to an exterior case for an electronic device, and in particular to an exterior case for connecting the edges of first and second case constituent members, each of which has at least an inner surface made conductive. The present invention relates to an exterior case for an electronic device, in which the first and second case constituent members are electrically connected by the coupling.

[Prior Art] Currently, the exterior cases of various electronic devices are generally made of plastic, which is a polymeric material, in order to reduce the weight of electronic devices and reduce costs through mass production. In order to shield electromagnetic waves, these external cases for electronic devices have a structure in which a conductive film is formed on the inner surface by coating with conductive paint, metal vapor deposition, plating, etc., or the case itself is molded from conductive plastic. has been done.

An example of the conventional structure of such an external case for electronic equipment is shown in Part 6.
As shown in the figure. In FIG. 6, reference numerals 1 and 2 are the case constituent members, a lower case and an upper case, which are made of polymeric plastic, and the above-mentioned conductive layer is formed on the inner surface of each of them. . Ribs la and ribs 1b are formed over the entire upper edge of the lower case l. In addition, ribs 2a extend over the entire underlined part of the upper case 2.
A groove 2b is formed. ribs 1a, 2a and grooves Ib,
The cross-sectional shape of 2b is, for example, rectangular. A conductive film is formed continuously from the inner surface of the lower case l from the upper surface to the outer surface of the rib la. Further, a conductive film is formed continuously from the inner surface of the upper case 2 on the inner surface of the upper case 2b. Note that the conductive film is formed, for example, by coating with a conductive paint.

Then, the rib la is fitted into the groove 2b, and the rib 2a is fitted into the groove 1b.
By fitting them together, the edges of the lower case 1 and the upper case 2 are joined together to form an exterior case for an electronic device.

Furthermore, the conductive films of the lower case 1 and the upper case 2 are electrically connected to each other by contact between the conductive films at the joint portion.

This connection ensures the Ti magnetic wave shielding effect.

Assuming that the electronic device using this electronic device exterior case is, for example, an electronic desktop calculator, a keyboard 3, a display 4, etc. are provided on the upper surface of the upper case 2.

[Problem to be Solved by the Invention 1] However, the above conventional structure has the following drawbacks.

First, since the contact area between the conductive films at the joint between the lower case 1 and the upper case 2 is small, the electrical connection between the conductive films of the lower case 1 and the upper case 2 is uncertain.

Furthermore, it is difficult to mask the lower case 1 and the upper case 2 when forming a conductive film by applying a conductive paint. The state of this masking is shown in FIG. In order to prevent the paint 6 from being applied to the outer surface of the case L, that is, the outer surface that is visible from the outside when the lower case L and upper case 2 are combined, a mask 5 with a sharp tip is attached to the rib L.
Press it against the lower edge of the outside surface of a. A conductive paint is sprayed onto the shaded area of the surface of the lower case l to form a conductive film.

However, it is not easy to create a mask 5 having the cross-sectional shape shown in the figure, and it is costly. Furthermore, it is difficult to align the mask 5 as described above, and the painting process takes time and effort, which also increases costs.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to eliminate such drawbacks in this type of exterior case for electronic equipment.

[Means for Solving the Problems] In order to solve the above problems, according to the present invention, the first and second case constituent members each having at least an inner surface made conductive are connected to each other at their edges. , in the exterior case for an electronic device in which the first and second case constituent members are electrically connected by the coupling, several ribs are formed in parallel on the edge of the first case constituent member; , a knob corresponding to the groove between the plurality of ribs is formed on the edge of the second case component, and a rib of the second case component is formed in the groove between the ribs of the first case component. By fitting,
The edges of the first and second case constituent members are joined together;
A structure is adopted in which the first and second case constituent members are electrically connected.

[Operation 1] According to such a structure, the contact area between the first and second case constituent members at the joint portion is large.

Electrical connection between the first and second case constituent members can be established reliably. In addition, if a conductive film is formed by coating with a conductive paint to make at least the inner surfaces of the first and second case components conductive, the masking of the coating can be done easily and easily.

[Example] Hereinafter, details of embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a partially cutaway perspective view illustrating the structure of an exterior case for electronic equipment according to a first embodiment of the present invention. In this figure, parts common or corresponding to those in FIG. 6 of the conventional example are given the same reference numerals, and a description of the common parts will be omitted.

As shown in FIG. 1, this embodiment differs from the conventional example in the connection structure between the edges of the upper case 2 and the lower case l. That is, while the lower case l has ribs la and grooves 1b formed over the entire upper edge as in the conventional example,
As for the upper case 2, there are two ribs 2a along the entire lower edge.

2a' are formed in parallel with the groove 2b in between. Note that the ribs la, 2a, 2a' and the groove 1b.

The cross-sectional shape of the groove 2b is rectangular here, and the cross-sectional shapes of the rib la and the groove 2b correspond to each other.

A conductive film is formed on the inner surfaces and edges of the lower case 1 and the upper case 2 by applying a conductive paint. In that case, masking of the lower case 1 and the upper case 2 is performed as shown in FIGS. 2 and 3, respectively. In the case of the lower case 1, masking is performed by bringing a mask 8 having a rectangular cross-sectional shape into contact with the outer surface of the rib La. Then, the conductive paint 6 is sprayed onto the lower case 1 from the nozzle 7 of the coating device so that the conductive film is coated on the lower case 1.
It is formed on the hatched portion of the surface, that is, on the inner surface of the lower case l including the inner surface of the rib la and on the upper surface of the rib la.

Further, in the case of the upper case 2, masking is performed by similarly bringing a mask 9 having a rectangular cross-sectional shape into contact with the upper surface of the outer rib 2a'. Then, the conductive paint 6 is sprayed onto the upper case 2 from the nozzle 7, and the conductive film is applied to the hatched areas on the surface of the upper case 2, that is, the inner surface of the upper case 2 including the inner surface of the inner rib 2a, and the upper surface of the rib 2a. and is formed on the inner surface of 2b.

The lower case l and upper case 2, on which the conductive film has been formed in this way, are combined as shown in FIG. combined. At this time, the part of the conductive film formed on the inner surface and the upper surface of the rib la comes into contact with the part of the conductive film formed on the inner surface of the rib 2b, so that the lower case l and the upper case 2 are electrically conductive. The membranes are electrically connected to each other, ensuring an electromagnetic wave shielding effect.

According to the structure of the electronic device exterior case of this embodiment, the mutual contact area of the joint portion of the lower case l and the upper case 2, which are joined by fitting the ribs 2b to 2b, is the first As is clear from the comparison between FIG. 6 and FIG. 6, the size is significantly larger than that of the conventional example. Therefore, the contact area of the conductive films at this joint is made much larger than in the conventional case, and the electrical connection between the conductive films of the lower case 1 and the upper case 2 can be ensured, and the electromagnetic wave shielding effect can be improved. Can be secured.

In addition, according to this embodiment, since the contact area at the above-mentioned joint is large, masking can be performed with sufficient margin when applying conductive paint, and the cross-sectional shape of 1\L pure as shown in Figs. 2 and 3. Masking can be performed using the mask 8.9. In this case, the position of the mask 8.9 is shifted to the right in FIGS. 2 and 3, and the conductive film is formed to protrude, and the conductive film is formed to cover the bottom surface of the groove tb or the top surface of the rib 2a'. Even if this is the case, there is no problem because the protruding portion of the conductive film is not visible from the outside when the lower case 1 and the upper case 2 are combined. In this way, rough masking can be performed using a mask that has a simple shape and can be produced at low cost, and the process of forming a conductive film by coating with conductive paint can be performed easily and inexpensively, reducing the cost of external cases for electronic devices. can be achieved.

By the way, in the structure of the first embodiment, the cross-sectional shapes of the ribs la, 2a, 2a' and the grooves lb, 2b of the lower case l and upper case 2 are not limited to the rectangular shape shown in FIG. As shown in FIG. 4 as a second embodiment of the present invention, ribs la, 2a, 2a' and grooves 1b of a lower case l and an upper case 2,
The cross section of 2b is trapezoidal or almost V-shaped, and the rib l
The side surfaces of a and 2b may be tapered and formed to be slanted. In addition, in FIG. This is the part that forms the membrane.

According to the structure shown in FIG. 4, the surface contact between the groove 2b between the ribs 2a and 2a' and the rib la at the joint portion of the lower case l and the upper case 2 is more reliable than in the case of FIG. Electrical connections between the conductive films of the upper case 2 can be made more reliably.

11 In addition, in the structure of the first embodiment, the number of ribs on the lower case 1 and the upper case 2 is not limited to that shown in FIG. For example, as shown in FIG. 5 as a third embodiment of the present invention, two ribs la and la' are formed in parallel on the upper edge of the lower case l, and three ribs are formed on the lower edge of the upper case 2. ribs 2a, 2a'
, 2a'' may be formed in parallel, in which case the ribs 2a
.

Groove 2b between 2a' and rib 2a', groove 2b' between 2a''
The lower case 1 and the upper case 2 are connected by fitting the ribs la and la' into the respective ribs. Furthermore, the fifth
Similarly, in the figure, the hatched areas on the surfaces of the lower case 1 and the upper case 2 are areas where a conductive film will be formed by coating with the above-mentioned conductive paint.

According to the structure shown in FIG. 5, the contact area between the ribs and grooves at the joint between the lower case 1 and the upper case 2 is significantly increased compared to the case shown in FIG. Electrical connection can be made more securely.

In each of the above embodiments, the conductive films of the lower case 1 and upper case 2 were formed by coating with conductive paint.
Of course, the method for forming the conductive film is not limited to this method. In addition, no conductive film is formed on the lower case 1 and upper case 2,
Even if the lower case 1 and the upper case 2 are made of conductive plastic, similar effects can be obtained by employing the above-described coupling structure of the lower case 1 and upper case 2.

[Effects of the Invention] As is clear from the above description, according to the present invention, the edges of the first and second case constituent members, each of which has at least an inner surface made of conductive material, are joined to each other. In the exterior case for an electronic device in which the first and second case components are electrically connected, a plurality of ribs are formed in parallel on the edge of the first case component, and the second Forming ribs corresponding to the grooves between the plurality of ribs on the edge of the case component, and fitting the ribs of the second case component into the grooves between the ribs of the first case component. Therefore, we adopted a structure in which the edges of the first and second case constituent members are joined together and the first and second case constituent members are electrically connected. The contact area at the joint portion of the case constituent members is large, and the electrical connection between the first and second case constituent members can be reliably established, and the electromagnetic wave shielding effect can be ensured. In addition, when forming a conductive film by coating with conductive paint to make at least the inner surfaces of the first and second case components conductive, masking can be easily performed, simplifying the painting process and making it suitable for electronic equipment. An excellent effect can be obtained in that the cost of the outer case can be reduced.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway perspective view showing the structure related to the present invention of an external case for electronic equipment according to a first embodiment of the present invention, and FIGS. 2 and 3 are respectively a lower case and an upper case in FIG. 1. In contrast, FIGS. 4 and 5 are explanatory diagrams of masking when a conductive film is formed by coating with conductive paint, and FIGS. FIG. 6 is a partially cutaway perspective view showing the structure of a conventional external case for electronic equipment; FIG. 7 is a cross-sectional view of the case and the upper case;
The figure is an explanatory diagram of masking when a conductive film is formed by coating with a conductive paint in the same conventional example. ■...Lower case 2...-Upper case la, la,
2a, 2a', 2a''...-rib lb, lb', 2b
, 2b'--groove

Claims (1)

[Claims] 1) It is constructed by coupling the edges of first and second case constituent members whose inner surfaces are electrically conductive, and the first and second case constituent members are electrically connected by the coupling. In the exterior case for electronic equipment, a plurality of ribs are formed in parallel on the edge of the first case component,
A rib corresponding to the groove between the plurality of ribs is formed on the edge of the second case component, and the rib of the second case component is fitted into the groove between the ribs of the first case component. An exterior for an electronic device, characterized in that the edges of the first and second case components are joined together and the first and second case components are electrically connected. Case.