JP2003158562A - Ground connection structure for mobile phone - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a ground connection structure for a mobile phone that connects an internal board in a case for the mobile phone to ground without causing increase in the number of components and the number of manufacture processes. SOLUTION: A conductive extension part 9B extended externally from a flexible board 9A is formed to the flexible board 9A in the mobile phone case 50 within the same plane as that of the flexible board 9A, and by inserting the extension part 9B between a first case part 6 and a second case part 7, the flexible board 9A is electrically connected to the first case part 6 via the extension part 9B.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a mobile phone,
In particular, it relates to a housing for a mobile phone. More specifically, the present invention relates to an improvement of a ground structure of a substrate arranged inside a mobile phone.

[0002]

2. Description of the Related Art FIG. 9 shows a conventional foldable mobile phone 1.
It is a typical perspective view which shows the internal structure of 00. Figure 10
Is a foldable mobile phone 100 in the open state.
11 is a schematic side view of FIG. 11, and FIG. 11 is a schematic side view of the folding mobile phone 100 in a closed state.

As shown in FIG. 9, a conventional foldable mobile phone 100 is equipped with an upper housing 1 having a display 4 mounted thereon and a key operating section 5 having a plurality of data input buttons or keys. And a hinge mechanism 3 that rotatably connects the upper housing 1 and the lower housing 2 to each other. The hinge mechanism 3 is the upper housing 1.
And may be formed as a separate body from the lower housing 2,
Alternatively, it may be formed as a part of the upper housing 1 and the lower housing 2.

The upper housing 1 is formed by connecting an upper housing front surface portion 6 located on the side where the display 4 is mounted and an upper housing rear surface portion 7 located on the side opposite to the display 4 to each other. It is composed by.

Upper housing front portion 6 and upper housing rear portion 7
Inside the casing formed by, the receiver 8, the upper casing circuit board 9, the display 4 and the upper casing circuit unit 10 are provided.
Is loaded.

Similar to the upper housing 1, the lower housing 2 includes a lower housing front surface portion 11 located on the side where the key operating portion 5 is mounted and a lower housing located on the side opposite to the key operating portion 5. It is configured by connecting the housing back surface portion 12 to each other.

Inside the housing formed by the lower housing front surface portion 11 and the lower housing rear surface portion 12, a microphone 13, an external interface connector 14, and a lower housing circuit board 1 are provided.
5, the lower housing circuit section 16, and the battery 17 are loaded.

Upper case circuit section 10 and lower case circuit section 16
Are electrically connected to each other via the upper and lower circuit connecting portions 10a extending over the upper housing 1 and the lower housing 2 beyond the hinge mechanism 3.

In the foldable mobile phone 100, a whip antenna (not shown) used as an external antenna is arranged so as to project upward from the upper end of the upper housing 1.

[0010]

FIG. 12 shows the upper housing 1.
FIG.

As described above, the upper casing 1 is formed with a casing having an outer shape from the upper casing front face portion 6 and the upper casing rear face portion 7, and the upper casing circuit board 9 is provided therein. It is arranged. As shown in FIG. 12, the upper housing circuit board 9 is fixed to the front surface 6 of the upper housing by the frame 2
It is fixed on 1.

The upper case circuit board 9 must be grounded in order to maintain its electrical characteristics.

Therefore, the foldable portable telephone 100
In the above, the upper housing front surface portion 6 is made of a metal or other conductive material, and the upper housing circuit board 9 is electrically connected to the upper housing front surface portion 6 so that the upper housing circuit board 9 is grounded. It is carried out.

Specifically, as shown in FIG. 12, the upper housing circuit board 9 is electrically connected to the upper housing front portion 6 via a crank-shaped metal fitting 22, and the upper housing circuit board 9 is connected.
Doing earth.

The crank-shaped metal fitting 22 is provided on the first horizontal surface 2
2a, a second horizontal plane 22b forming a plane parallel to the first horizontal plane 22a, a first horizontal plane 22a and a second horizontal plane 22.
It is composed of a vertical surface 22c which extends perpendicularly to both b and connects the first horizontal surface 22a and the second horizontal surface 22b to each other.

FIG. 13 is a sectional view showing a state in which the upper housing circuit board 9 is electrically connected to the upper housing front portion 6 by using the metal fitting 22.

As shown in FIG. 13, the upper housing front surface portion 6
At the four corners thereof, first projecting portions 6a projecting toward the lower housing rear surface portion 7 are formed, and at the lower housing rear surface portion 7, the positions of the four corners corresponding to the first projecting portions 6a are formed. In, a second projecting portion 7 a projecting toward the upper housing front surface portion 6 is formed. The first protruding portion 6a and the second protruding portion 7a function as bosses.

A through hole 6b is formed in the center of the first protruding portion 6a, and a hole 7b is formed in the second protruding portion 7a at a position corresponding to the through hole 6b. A female screw portion 7c is formed in the hole 7b. Furthermore, metal fittings 22
A through hole 22d is formed in the first horizontal surface 22a corresponding to the through hole 6b and the hole 7b.

When the upper housing circuit board 9 is electrically connected to the upper housing front surface portion 6 by using the metal fitting 22, first, the second horizontal plane 22b of the metal fitting 22 is connected to the upper housing circuit board 9 first.
The upper housing front surface portion 6 and the lower housing rear surface portion 7 are fitted together. At that time, the first horizontal surface 22a of the metal fitting 22 is sandwiched between the first projecting portion 6a and the second projecting portion 7a. Then, the first protrusion 6a
A screw (not shown) is passed through the through hole 6b of the second through hole 22d of the first horizontal surface 22a, and the female screw portion 7 of the second protrusion 7a
Screw to c.

In the foldable mobile phone 100,
As described above, the upper housing circuit board 9 is electrically connected to the upper housing front surface portion 6 via the metal fitting 22.

However, the electrical connection between the upper casing circuit board 9 and the upper casing front portion 6 in the conventional foldable portable telephone 100 has the following problems.

The first problem is that it is impossible to reduce the size and weight of the mobile phone.

With the recent demand for downsizing and weight saving of mobile phones, there is a demand for downsizing of the internal board and mounted parts and reduction of the number of parts. However, in order to fix the metal fitting 22 on the upper housing circuit board 9, an extra board area is required for that purpose, which results in an increase in the outer size and weight of the mobile phone.

The second problem is that the number of parts and the number of manufacturing steps increase.

In the conventional foldable mobile phone 100, since the metal fitting 22 which is an independent component is used to electrically connect the upper housing circuit board 9 to the upper housing front surface portion 6, the number of parts and the metal fitting are used. 22 is the upper housing circuit board 9
It is not possible to avoid an increase in the number of manufacturing steps for attaching to the device, and thus an increase in manufacturing cost.

These problems occur not only in the foldable mobile phone 100 but also in the non-foldable cuboid mobile phone.

The present invention has been made in view of the above problems, and is for a portable telephone in which the upper housing circuit board 9 can be grounded without increasing the number of parts and the number of manufacturing steps. The purpose is to provide a housing.

[0028]

In order to achieve this object, the present invention is a case for a mobile phone, wherein the case is formed by combining a conductive first case part and the first case part. A second housing part forming a body, and a flexible board arranged between the first housing part and the second housing part, the flexible board being connected to the first housing part. In the case for a mobile phone in which the flexible substrate is grounded, the flexible substrate is formed with a conductive extension portion that extends outward from the flexible substrate in the same plane as the flexible substrate. Further, the flexible board is grounded by sandwiching the extension portion between the first housing portion and the second housing portion.

In the mobile phone casing according to the present invention, a flexible substrate (a substrate corresponding to the upper casing circuit board 9)
An extension portion is formed on the first housing portion (a portion corresponding to the upper housing front surface portion 6) and a second housing portion (a portion corresponding to the lower housing rear surface portion 7). The flexible board is electrically connected to the first housing portion by being sandwiched between the flexible board and the flexible board, and the flexible board is grounded. As described above, according to the mobile phone casing of the present invention, the metal fitting 2 used in the conventional foldable mobile phone 100.
It is not necessary to use 2 and it is possible to prevent an increase in the number of parts and the number of manufacturing processes that have occurred due to the use of the metal fitting 22.

The extension portions can be formed at any position on the flexible substrate. For example, if the extension portions are formed at the four corners of the flexible substrate, the extension portions can be used most efficiently.

A first protrusion is formed on the first casing portion so as to protrude toward the second casing portion, and a second protrusion is formed on the second casing portion so as to protrude toward the first casing portion. It is preferable that the portion is formed. In this case, the extension portion is sandwiched between the first protruding portion and the second protruding portion, so that the first
It will come into contact with the housing.

As described above, by providing the first projecting portion and the second projecting portion, it is possible to more reliably and firmly sandwich the extension portion between the first housing portion and the second housing portion. You can

For example, a through hole is formed in either one of the first protruding portion and the second protruding portion, a female screw hole is formed in the other, and a hole is formed in the extension portion at a position corresponding to the through hole. can do. Thus, the first protrusion, the second protrusion, and the extension can be coupled to each other through the through hole and the screw that is fixed to the female screw hole.

For example, the height of each of the first protrusion and the second protrusion is set so that the extension can be sandwiched between the first protrusion and the second protrusion in a planar state. can do.

By setting the heights of the first projecting portion and the second projecting portion in this way, the extension portion can be formed as it is without bending the extension portion to form the extension portion between the first housing portion and the second housing portion. Since it can be sandwiched between, it is possible to simplify the manufacturing process.

The extension may be used in a flat state, but the extension may be formed by bending in a crank shape in accordance with the height of each of the first and second protrusions. Is also possible.

Depending on the heights of the first protrusion and the second protrusion, it may be necessary to bend the planar extension when fitting the first casing part and the second casing part together. However, by bending the extension portion into a crank shape in advance, the degree of contact with the first housing portion can be increased.

The extension is required to be electrically conductive.
For example, in the area where the extension contacts the first protrusion,
The extension can be made conductive by performing a plating process.

In order to ground the flexible substrate, it is necessary that the first housing portion is also conductive like the extension portion. For example, the first housing portion is made of metal. As a result, the first housing portion can be made conductive.

Alternatively, the first housing portion is made of plastic,
It is also possible to make the first casing part electrically conductive by forming a conductive film on the surface of the first casing part at least in a region in contact with the extension part, which is made of ceramics or other non-conductive material. it can. As the conductive film formation, for example,
A metal vapor deposition film can be selected.

The extension portion is not limited to the first housing portion, but the second housing portion.
It may be electrically connected to the housing portion.

As a result, the flexible substrate can be grounded more reliably.

By using the above mobile phone casing in a mobile phone, it is possible to provide a mobile phone in which the grounding performance of the flexible substrate is improved.

The above-mentioned mobile phone housing is a cubic mobile phone (not of a foldable type but of a type in which the upper housing 1 and the lower housing 2 are integrally formed) or a foldable mobile phone. It is possible to apply to both. For example, when the above mobile phone housing is applied to a foldable mobile phone, an upper housing 1 and a lower housing 2 are provided.
It is possible to apply any of the above, or both the upper housing 1 and the lower housing 2.

[0045]

1 is a front perspective view of a foldable mobile phone 110 to which a mobile phone housing 50 according to a first embodiment of the present invention is applied, and FIG. 2 is a foldable mobile phone. 3 is a rear perspective view of the telephone 110. FIG.

The foldable mobile phone 110 is similar to the foldable mobile phone 100 shown in FIG.
And a lower case 2 and a hinge mechanism 3 that rotatably connects the upper case 1 and the lower case 2 to each other.
The mobile phone housing 50 according to the present embodiment is used as the upper housing 1 of the foldable mobile phone 100.

FIG. 3 is an exploded perspective view of the mobile phone housing 50 according to the first embodiment of the present invention.

Mobile phone housing 50 according to the present embodiment
Is a first casing part located on the side where the display 4 (not shown in FIG. 3, see FIG. 1) is mounted, similar to the upper casing 1 of the foldable mobile phone 100 shown in FIG. Front part 6 of the upper housing and a rear part 7 of the upper housing as a second housing part located on the side opposite to the display 4.
It is configured by mutually connecting and.

Upper housing front portion 6 and upper housing rear portion 7
A receiver 8, an upper case circuit board 9A as a flexible board, a display 4 and an upper case circuit section 10 are loaded inside the case formed by (8, 9, 10).
Is not shown in FIG. 3).

In the foldable mobile phone 110, the whip antenna 24 (see FIGS. 1 and 2) used as an external antenna is arranged so as to project upward from the upper end of the upper housing 1. .

As shown in FIG. 3, the upper housing circuit board 9A
Is fixed on a frame 21 which is fixed to the front part 6 of the upper housing.

As shown in FIG. 3, the upper housing circuit board 9A
Includes a conductive extension 9B extending outward from the upper housing circuit board 9A in the same plane as the upper housing circuit board 9A.
Are formed at the four corners of the upper housing circuit board 9A. As will be described later, in the mobile phone casing 50 according to the present embodiment, the four extension portions 9B are sandwiched between the upper casing front face portion 6 and the upper casing rear face portion 7 so that the upper portion The case circuit board 9A is configured to be grounded.

The upper housing front surface portion 6 is made of a conductive material, and in the present embodiment, made of magnesium alloy.

FIG. 4 is a sectional view showing the positional relationship among the upper housing front surface portion 6, the upper housing rear surface portion 7, the upper housing circuit board 9A and the extension portion 9B.

As shown in FIG. 4, the upper housing front surface portion 6 has a first projecting portion 6 which projects toward the upper housing rear surface portion 7.
a is formed, and the upper housing back surface portion 7 projects toward the upper housing front surface portion 6 and the first projection when the upper housing front surface portion 6 is coupled to the upper housing back surface portion 7. The second protruding portion 7a is formed at a position aligned with the portion 6a. The first projecting portion 6a and the second projecting portion 7a function as bosses that sandwich the extension portion 9B, as described later.

A through hole 6b is formed in the first protruding portion 6a, and a hollow hole 7b is formed in the second protruding portion 7a.
A female screw portion 7c is formed in the hollow hole 7b. Further, a hole 9C is formed in the extension portion 9B at a position corresponding to the through hole 6b and the hollow hole 7b.

The surface of the extension 9B that contacts the first protrusion 6a (that is, the lower surface of the extension 9B) is plated. That is, the extension portion 9B is configured to be electrically conductive with respect to the first protruding portion 6a.

5 to 7 are sectional views showing a process of connecting the upper housing front surface portion 6 to the upper housing rear surface portion 7. Hereinafter, referring to FIGS. 5 to 7, when the upper housing front surface portion 6 is coupled to the upper housing rear surface portion 7, the extension portion 9B of the upper housing circuit board 9A is electrically connected to the upper housing front surface portion 6. The state of connection is described.

First, as shown in FIG. 5, after fixing the upper casing circuit board 9A on the frame 21, the frame 21 is incorporated in the front face portion 6 of the upper casing. In this state,
The extension portion 9B extends in the same plane as the upper housing circuit board 9A.

Next, as shown in FIG. 6, the upper housing rear surface portion 7 is pressed against the upper housing front surface portion 6 from above,
When the upper housing rear surface portion 7 is started to be fitted to the upper housing front surface portion 6, the second projecting portion 7a comes into contact with the extension portion 9B, and in this state, the second protruding portion 7a is lowered toward the upper housing front surface portion 6 and extended. The part 9B is bent.

Finally, as shown in FIG.
B is bent like a crank and is sandwiched between the first protrusion 6a and the second protrusion 7a.

Finally, the extension portion 9B is fixed by screwing the screw 23 into the female screw hole 7c of the second protrusion portion 7a through the through hole 6b of the first protrusion portion 6a and the through hole 9C of the extension portion 9B. It fixes between the 1st protrusion part 6a and the 2nd protrusion part 7a. In this state, the extension portion 9B is in close contact with the upper housing front surface portion 6, and the extension portion 9B, and by extension, the upper housing circuit board 9A is in a state of being electrically connected to the upper housing front surface portion 6. Become.

According to the mobile phone housing 50 of this embodiment, the following effects can be obtained.

The first effect is that the ground connection function can be obtained in a small space, and as a result, the portable telephone can be downsized.

In the conventional ground connection structure, as shown in FIG.
As shown in FIG. 2, since the metal fitting 22 which is a metal ground connection component is mounted on the upper housing circuit board 9, a mounting space for the fitting 22 is required, which makes the upper housing circuit board 9 large. This has been a bottleneck in downsizing mobile phones. On the other hand, according to the mobile phone housing 50 of the present embodiment, since the shape of the upper housing circuit board 9A is only partially extended and the extension portion 9B is formed, a special mounting space is required. As a result, the size of the mobile phone can be reduced.

The second effect is that the number of parts, the weight of the apparatus, the number of assembling steps and the manufacturing cost can be reduced.

The reason for this is that the conventional ground connection structure requires a separate part called the metal fitting 22,
Although the number of parts, the weight and the number of assembling steps are increased, the total cost is increased. However, according to the mobile phone housing 50 according to the present embodiment, the total number of parts and the assembling steps are not increased. Can be lowered.

Mobile phone housing 5 according to the above-described embodiment
In No. 0, the extension portions 9B are formed at the four corners of the upper housing circuit board 9A, but the formation positions of the extension portions 9B are not limited to the four corners of the upper housing circuit board 9A.

For example, the side 9D of the upper housing circuit board 9A
It is also possible to form an extension extending from (see FIG. 3) in a direction orthogonal to the side 9D.

Mobile phone housing 5 according to the above-described embodiment
0, when the upper housing back surface portion 7 is joined to the upper housing front surface portion 6, as shown in FIG.
The extension portion 9B was brought into close contact with the front face portion 6 of the upper housing by bending in a crank shape.

On the other hand, as shown in FIG. 8, the heights of the first projecting portion 6a and the second projecting portion 7a are set so that the extending portion 9B remains flat. By setting the height so that the extension 9B can be sandwiched between the upper housing back surface portion 7 and the upper housing front surface portion 6 without bending the extension portion 9B in a crank shape. It can be sandwiched.

This makes it possible to set a small pressing force when the upper housing rear surface portion 7 is pressed into the upper housing front surface portion 6 from above.

Alternatively, the extension 9B may be replaced with the first protrusion 6a.
It is also possible to pre-bend into a crank shape as shown in FIG. 7 according to the height of each of the second protrusion 7a and the second protrusion 7a.

As a result, the degree of contact with the front face 6 of the upper casing can be increased, and the pressing force for pushing the rear face 7 of the upper casing against the front face 6 of the upper casing from above is set small. It will be possible.

In order to ground the upper casing circuit board 9A by bringing the upper casing circuit board 9A into contact with the upper casing front surface portion 6 via the extension portion 9B, not only the extension portion 9B but also the upper casing. The body front part 6 is also required to be electrically conductive. Therefore, in the mobile phone housing 50 according to the above-described embodiment, the upper housing front surface portion 6 is made of metal (magnesium alloy), but the upper housing front surface portion 6 is made of plastic, ceramic, resin, or the like. Of non-conductive material of which at least the extension 9B
By forming a conductive film in the region that comes into contact with, it is possible to make the upper housing front surface portion 6 conductive.
As the conductive film, for example, a metal vapor deposition film can be formed.

The extension portion 9B and thus the upper casing circuit board 9A
Can be configured to be electrically connected not only to the upper housing front surface portion 6 but also to the upper housing rear surface portion 7. Thereby, the grounding performance of the upper housing circuit board 9A can be improved.

For example, by plating not only the lower surface of the extension portion 9B but also the upper surface of the extension portion 9B, the upper housing circuit board 9A is mounted on the upper housing front surface portion 6 and the upper housing rear surface portion 7.
It is possible to electrically connect both of them.

In the above-described embodiment, an example in which the mobile phone housing 50 is used as the upper housing 1 of the foldable mobile phone 100 shown in FIG. 9 has been described. The application example is not limited to the above embodiment.

For example, the mobile phone housing 50 can be used as the lower housing 2 of the foldable mobile phone 100 shown in FIG. 9, or both the upper housing 1 and the lower housing 2 can be used. It is also possible to use.

The mobile phone housing 50 according to the above-described embodiment is not limited to the foldable mobile phone shown in FIG. 9, but is also a cubic mobile phone (not a foldable mobile phone.
The upper housing 1 and the lower housing 2 are integrally formed).

[0081]

According to the present invention, the following effects can be obtained.

The first effect is that the ground connection function can be obtained in a small space, and as a result, the mobile phone can be downsized.

In the conventional ground connection structure, as shown in FIG.
As shown in FIG. 2, since the metal fittings 22 are mounted on the upper housing circuit board 9, a mounting space for the metal fittings 22 is required, which makes the upper housing circuit board 9 large and downsizes the mobile phone. It was a bottleneck in planning. On the other hand, according to the mobile phone housing of the present invention, since the extension is formed by partially extending the shape of the flexible substrate, it is necessary to dispose the metal fitting 22. No special mounting space is required, and as a result, the mobile phone can be downsized.

The second effect is that the number of parts, the weight of the apparatus, the number of assembling steps and the manufacturing cost can be reduced.

The reason for this is that the conventional ground connection structure requires a separate part called the metal fitting 22.
Although the number of parts, the weight and the number of assembling steps have increased, and the total cost has increased, the use of the metal fitting 22 is no longer necessary according to the mobile phone housing of the present invention. It is possible to suppress an increase in the number of parts and the number of assembling steps, and it is possible to reduce the total cost.

[Brief description of drawings]

FIG. 1 is a front perspective view of a foldable mobile phone to which a mobile phone housing according to a first embodiment of the present invention is applied.

FIG. 2 is a rear perspective view of a foldable mobile phone to which the mobile phone housing according to the first embodiment of the present invention is applied.

FIG. 3 is an exploded perspective view of a mobile phone housing according to the first embodiment of the present invention.

FIG. 4 is a cross-sectional view showing an arrangement relationship of each element in the mobile phone casing shown in FIG.

5 is a cross-sectional view showing an assembling process when assembling the mobile phone casing shown in FIG.

FIG. 6 is a cross-sectional view showing an assembling process when assembling the mobile phone casing shown in FIG.

FIG. 7 is a cross-sectional view showing an assembling process when assembling the mobile phone casing shown in FIG.

8 is a cross-sectional view showing a modified example of the mobile phone casing shown in FIG.

FIG. 9 is a schematic perspective view showing an internal structure of a conventional foldable mobile phone.

10 is a schematic side view of the foldable mobile phone device shown in FIG. 9 in an opened state.

11 is a schematic side view of the foldable mobile phone device shown in FIG. 9 in a closed state.

FIG. 12 is an exploded perspective view showing an internal structure of a housing of a conventional foldable mobile phone.

FIG. 13 is a cross-sectional view showing a ground connection structure of the conventional foldable mobile phone shown in FIG.

[Explanation of symbols]

110 mobile phone 1 to which the mobile phone housing according to the first embodiment of the present invention is applied 1 upper housing 2 lower housing 3 hinge mechanism 50 mobile phone housing 6 according to the first embodiment of the present invention Upper housing front surface portion 6a First protruding portion 7 Upper housing rear surface portion 7a Second protruding portion 9A Upper housing circuit board 9B Extension portion 21 Frame 24 External antenna

Claims (12)

[Claims] 1. A casing for a mobile phone, comprising: a conductive first casing portion; a second casing portion that is combined with the first casing portion to form the casing; A flexible substrate disposed between the first casing portion and the second casing portion, and the flexible substrate is formed by connecting the flexible substrate to the first casing portion. In a case for a mobile phone to be grounded, the flexible substrate is formed with a conductive extension that extends outward from the flexible substrate in the same plane as the flexible substrate. The flexible board is grounded by being sandwiched between the first housing part and the second housing part. 2. The mobile phone casing according to claim 1, wherein the extension portions are formed at four corners of the flexible substrate. 3. The first casing part is formed with a first protrusion that protrudes toward the second casing part, and the second casing part faces toward the first casing part. A second projecting portion is formed so as to project, and the extension part contacts the first housing part by being sandwiched between the first projecting part and the second projecting part. Claim 1
Alternatively, the mobile phone casing described in 2. 4. A through hole is formed in one of the first protrusion and the second protrusion, and a female screw hole is formed in the other of the first protrusion and the extension at a position corresponding to the through hole. A hole is formed, and the first projecting portion, the second projecting portion, and the extension portion are coupled via a screw fixed to the female screw hole through the through hole. The mobile phone housing according to claim 3. 5. The height of each of the first protrusion and the second protrusion is equal to that of the first protrusion while the extension is in a planar state.
The height is set such that it can be sandwiched between the projecting portion and the second projecting portion.
Or the mobile phone casing described in 4. 6. The extension portion is formed by bending in a crank shape according to the height of each of the first protrusion portion and the second protrusion portion. The mobile phone casing described in. 7. The casing for a mobile phone according to claim 1, wherein the extension portion is plated in a region in contact with the first protrusion. body. 8. The mobile phone casing according to claim 1, wherein the first casing portion is made of metal. 9. The first casing part is made of a non-conductive material, and a conductive film is formed on a surface of the first casing part at least in a region in contact with the extension part. The mobile phone housing according to any one of claims 1 to 7, which is characterized in that. 10. The mobile phone casing according to claim 1, wherein the extension portion is also electrically connected to the second casing portion. 11. A mobile phone provided with the mobile phone housing according to claim 1. 12. A foldable mobile phone comprising two housings which are rotatable with respect to each other via a hinge mechanism, wherein at least one of the housings is one of claims 1 to 10. A foldable mobile phone, which comprises the mobile phone housing described above.