JPH08298538A - Foldable portable telephone set - Google Patents

Abstract

PURPOSE: To secure freedom on the design of a telephone set body, to correspond to the request of lightening and miniaturizing a telephone set and to provide versatility of components by storing means for developing and folding/ holding the telephone set in a hinge. CONSTITUTION: The portable telephone set consists of a first casing 10 having a receiver and a second casing 20 having a transmitter, and the first casing 10 and the second casing 20 are connected so that they can turn around the hinge 30. Thus, opening and folding become free. An energizing means 40 which always energizes the first casing 10 and the second casing 20 in the opening direction and an opening lock means 50 locking the first casing 10 and the second casing 20 in a state where they are open at a prescribed angle are provided in the hinge 30. A folding lock means 60 locking the first casing 10 and the second casing 20 in a state where they are folded against the energizing force of the energizing means 40 and a lock releasing means 70 releasing locking by the folding lock means 60 are integrally stored.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a housing having a transmitter and the like and a housing having a receiver and the like, which are foldably connected to each other.
The present invention relates to an automatic open-type foldable mobile phone in which both housings can be unfolded with a single touch of a button, and more particularly to a foldable mobile phone in which all means for unfolding and holding the phone are housed in a hinge.

[0002]

2. Description of the Related Art In general, as a mobile phone, a foldable mobile phone is widely adopted mainly from the viewpoint of improving portability. This type of foldable mobile phone includes a casing on the side of a receiver and a casing on the side of a transmitter, which are rotatably coupled via a hinge. Then, these two housings are unfolded with a single touch of a button when the telephone is used, and after use, both housings are folded and overlapped with each other and stored in a bag, a pocket or the like and carried. There is.

As shown in FIG. 5, a conventional folding type portable telephone of this type includes a first casing 100 in which a receiver 101, an antenna 102, operation keys 103 and the like are arranged, and a transmitter 201 and the like. The second housing 200 is arranged, and the first housing 100 and the second housing 200 are hinges 300.
It is rotatably connected via the and is assembled so that it can be unfolded and folded.

In the hinge 300, a biasing spring 40 that constantly biases the first casing 100 and the second casing 200 in the developing direction.
0 is disposed, and the first housing 100 has a folding locking claw 50 for holding both housings in a folded state.
0 and a lock release button 600 for moving the folding locking claws 500 to unlock the two housings, and the second housing 200 is engaged with the folding locking claws 500. A ditch 501 is formed.

In the conventional foldable portable telephone having such a structure, when the telephone is being carried, that is, when the telephone is not used, both casings are rotated against each other against the urging force of the urging spring 400 to be stacked. By matching, the folding locking claw 500 and the locking groove 501 are engaged, so that the phone can be folded and carried.

When the telephone is used, the locking release button 600 is pressed to fold the locking claw 500 and the locking groove 5.
By releasing the engagement of 01, both housings are urged by the urging spring 400 to rotate about the hinge 300,
Since it is deployed, the telephone can be used in that state.

As described above, in the conventional foldable portable telephone, by assembling the respective parts constituting the folding holding and unfolding means of the telephone into the respective parts of the both housings and the hinges, the portable telephones are piled up to be compact when being carried. At the same time, it can be deployed with one touch when used. Japanese Patent Application Laid-Open No. 4-3078 discloses an example of adopting the folding holding and unfolding means of this type of foldable mobile phone.
There is a mobile phone described in Japanese Patent No. 41.

[0008]

However, in such a conventional folding type mobile telephone, as shown in FIG. 5, the biasing spring 400, the folding locking claw 500, the locking groove 501, or the engaging groove is engaged. A means for folding and unfolding the telephone, such as a stop release button 600, is provided in the first housing 10.
No. 0, the second housing 200, and the hinge 300 are arranged in a dispersed manner.

Therefore, it is necessary to dispose each of the folding and unfolding means in the constituent parts of the telephone.
This greatly restricts the layout of components such as the transmitter / receiver, the antenna, and the operation keys that perform the original functions of the telephone and the mounting structure of the housing, which hinders the degree of freedom in design, weight reduction, and miniaturization of the telephone. There was a problem that

Further, in the conventional telephone in which the folding and unfolding means are dispersed in each part of the telephone, when the appearance, shape, size or the like of the telephone body is changed, a biasing spring or a folding lock is adapted accordingly. In many cases, it is necessary to change the design of the structures and parts such as the claws and locking grooves, which lacks versatility as parts and leads to a rise in product cost.

In Japanese Utility Model Laid-Open No. 4-105742, there is disclosed a main housing having a receiver and an antenna, and a transmitter rotatably attached to a lower end of the main housing via a hinge. A portable telephone device including a sub-housing has been proposed. According to this telephone device, the antenna is housed in the main housing when the main housing and the sub housing are folded, and when the sub housing is rotated from the main housing and deployed, the antenna is Automatically protrudes out of the main housing,
The telephone device can be used as it is.

However, in this portable telephone device, the antenna projecting means is interlocked with the hinge for rotating the main housing and the sub housing, whereby the antenna is automatically projected at the same time when the sub housing is unfolded. With respect to the means for holding the unfolding and folding of the housing, like the conventional telephone, it is arranged in a distributed manner in both housings,
However, the above-mentioned problems cannot be solved.

The present invention has been proposed in order to solve the above problems of the conventional technique, and by accommodating all the means for unfolding and folding the telephone in the hinge, the telephone body It is an object of the present invention to provide a foldable mobile phone that has versatility as a component while ensuring flexibility in design, responding to requests for weight reduction and size reduction of the phone.

[0014]

In order to achieve the above object, a foldable mobile phone according to claim 1 of the present invention comprises a first casing having at least a receiver and a second casing having at least a transmitter. In a foldable mobile phone in which the first and second casings are rotatably coupled to each other via a hinge and can be expanded and folded freely, in the hinge, the first casing and the second casing are provided. Urging means for urging the body in the direction of always developing, and folding locking means for locking the first housing and the second housing in a folded state against the urging force of the urging means. And a lock releasing means for releasing the lock by the folding locking means.

Further, in the folding mobile phone according to the present invention, the urging means comprises a torsion spring.

Further, the foldable mobile phone according to a third aspect of the present invention includes a deployment locking means for locking the first housing and the second housing in a deployed state at a constant angle in the hinge. There is.

According to a fourth aspect of the present invention, in the foldable mobile phone, the expansion locking means is provided with a shaft arranged on the other end side of the hinge and the shaft loosely penetrates in the center of the shaft. A first boss that is movable in the axial direction and is rotatable about the axis in the hinge, and the shaft loosely penetrates around the first boss. Is engaged when it is deployed, and is interposed between the second boss that is movable only in the axial direction within the hinge and between the shaft and the first boss, and the first boss is always on the second boss side. The torsion spring is wound around the outer periphery of the second boss, and both ends of the spring are fixed to the first boss and the second boss, respectively. The two bosses are always biased in the direction in which the first and second housings are deployed. It is constituted.

Further, in the folding type portable telephone according to claim 5, the folding locking means has a third boss rotatable in an axial direction in the hinge, and the third casing has the first casing. And a fourth boss that engages when the second housing is folded and is movable only in the axial direction in the hinge, and the unlocking means moves in the axial direction in the hinge. It is freely arranged and has a shaft portion that penetrates the third boss and presses the fourth boss in a direction away from the third boss, and can be pressed in the center direction of the hinge from one end side of the hinge. A lock release button, and a biasing member interposed between the lock release button and the third boss for constantly biasing the lock release button and the third boss in opposite directions. is there.

[0019]

According to the foldable portable telephone of the present invention having the above-mentioned structure, the telephone is retained and retained in the expanded state by the biasing means and the expansion retaining means housed on one side of the hinge of the telephone. Further, the folding locking means housed on the other side of the hinge of the telephone can lock the telephone in a folded state against the biasing force of the biasing means.

Further, since the locking by the folding locking means can be released by pressing the locking release button penetrating through the center of the folding locking means, the unlocked telephone can be pushed by the biasing means of the biasing means. Is automatically expanded.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the folding mobile phone of the present invention will be described below with reference to the drawings. FIG. 1 is an overall perspective view of a foldable mobile phone according to an embodiment of the present invention with a housing unfolded. 2 is an exploded perspective view of a main part showing a structure of a hinge of the folding mobile phone of the present embodiment shown in FIG. 1, and FIG. 3 is an overall exploded perspective view obtained by further disassembling the structure of the hinge shown in FIG. It is a figure. Also,
FIG. 4 is a partially cutaway front view showing the structure of the hinge of the folding mobile phone of this embodiment shown in FIG.

As shown in these figures, the foldable mobile phone of this embodiment is provided with a first casing 10 having a receiver 11, an antenna 12 and the like, a second transmitter 21 and an operation key 22 and the like. The housing 20 is rotatably coupled via a hinge 30 to form a foldable mobile phone in which the first housing 10 and the second housing 20 can be unfolded and folded.

The hinge 30 includes tubular hinge locking portions 31 and 32 protruding from the first casing 10 side and cylindrical hinge locking portions 33 and 34 protruding from the second casing side. The urging means 40 and the expansion locking means 50 are arranged on one side inside the tubular locking portions, and the folding locking means 60 and the locking releasing means 70 are formed on the other side in an axial shape. It is configured so as to be rotatable by being stored as.

The hinge locking portions 32 and 34 are provided with key grooves 54b and 62b provided on a second boss 54 of a deployment locking means 50 and a fourth boss 62 of a folding locking means 60, which will be described later.
Two keys 32a and 34a that are engaged with each other are formed in the axial direction.

The key may be integrally formed on the inner circumference of each hinge engaging portion, but a cylindrical member having the key is formed as a separate member, and the key is press-fitted into the hinge engaging portion. It can also be provided by doing. In this embodiment,
As shown in FIG. 3, the former (integrally molded) method is used for the hinge locking portion 32, and the latter (separate body) method is used for the hinge locking portion 34.

Further, the central part of the telephone of the hinge 30,
That is, as shown in FIG. 2, an empty space is provided between the hinge locking portions 32 and 34, and is a space through which the wiring connecting the first housing 10 and the second housing 20 (not shown) passes. ing. It should be noted that, as shown in FIG. 1, this wiring space is so invisible that the inside thereof cannot be seen when the telephone is completed, as shown in FIG.

Inside the hinge 30, a biasing means 40 for biasing the first casing 10 and the second casing 20 in a direction in which the first casing 10 and the second casing 20 are constantly deployed, and the first casing 10 and the second casing 10 are provided on one side in the axial direction. A deployment locking means 50 that locks the housing 20 in a state where it is deployed at a constant angle is provided, and on the other side, the first housing 10 and the second housing 10 resist the urging force of the urging means 40. Folding locking means 60 for locking the body 20 in a folded state, and locking releasing means 70 for unlocking the locking by the folding locking means 60 are provided, and each of them has a shaft of the hinge 30. I am configuring.

The expansion locking means 50 includes a shaft 51, a cylinder portion 52, a first boss 53, a second boss 54 and a spring 55.
The urging means 40 is wound around the outer periphery of the second boss 54, and both ends thereof are respectively the cylindrical portion 52 and the second boss 5.
It is fixed and arranged at 4.

The shaft 51 comprises a fixed portion 51a and a shaft portion 51b protruding from the fixed portion 51a.
It is arranged on one end side of the hinge 30. The fixed portion 51a is fixed to the end portion of the hinge locking portion 33 of the hinge 30, and the tip of the shaft portion 51b projects inside the hinge 30 toward the center of the hinge.

The tubular portion 52 is a cylindrical member that accommodates the first boss 53 so as to be movable in the axial direction, and is arranged on the inner periphery of the hinge engaging portion 33 so as to be rotatable about the axis. This tube 5
A key 53 provided on a first boss 53 described later is provided on the inner periphery of
A key groove 52b that engages with b is formed. Further, a fixing groove 52c is formed on the outer periphery of the cylindrical portion 52 so that the one end 40a of the biasing means 40 is engaged and fixed.

The first boss 53 engages with the inner circumference of the tubular portion 52 and is housed inside the tubular portion 52 so as to be movable in the axial direction. The first boss 53 has a stepped shaft hole with a small diameter at the tip side (center side of the hinge) formed at the center, and the shaft portion 51b of the shaft 51 is loosely inserted into this shaft hole. It has become. In addition, a concave portion 53a that engages with a convex portion 54a of the second boss 54, which will be described later, is formed at the tip portion of the first boss 53.

Further, on the outer periphery of the first boss 53, the cylindrical portion 5
The key 53b that engages with the key groove 52b provided on the inner circumference of the No. 2
However, two are formed in the axial direction. As a result, the first boss 53 can move only in the axial direction within the tubular portion 52 along the key groove 52b, and does not rotate in the axial direction in the tubular portion 52.

The second boss 54 is provided in the hinge engaging portion 32.
It is arranged in contact with the tip of the first boss 53. The outer shape of the second boss 54 is such that the first boss 53 side has a small diameter that can penetrate the center of a torsion spring of the biasing means 40 described later, and the tip side has a larger diameter than this small diameter portion. It has a stepped shape.

In the large-diameter portion of the outer shape of the second boss 54,
A key groove 54b that engages with the key 32a formed on the inner circumference of the hinge locking portion 32 is formed. Further, a shaft hole having a groove-shaped recess formed on the tip side is formed at the center of the second boss 54, and the shaft portion 51b of the shaft 51 penetrates the shaft hole. As a result, the second boss 54 can move within the hinge locking portion 32 only along the key groove 54b in the axial direction, and does not rotate inside the hinge locking portion 32 in the axial direction.

Further, as described above, the second boss 54 has the convex portion 54a formed on the contact surface with the first boss 53, which is engaged with the concave portion 53a formed at the tip of the first boss 53. There is. The convex portion 54a of the second boss 54 and the first boss 53
The recess 53a is formed in a direction in which the first housing 10 and the second housing 20 are engaged with each other when they are deployed at a certain angle.

Here, the expansion angle of the first housing 10 and the second housing 20 is an angle most suitable for making a telephone call or the like, and usually 150 to 160 degrees is preferable. The recess 53a of the first boss 53 and the second boss 5
The convex portions 54a of No. 4 are formed with an inclination so that engagement and disengagement of the concave and convex portions can be smoothly performed.

Further, the shaft 5 penetrating the second boss 54
The E-ring 56 for fixing, which is disposed in the groove-shaped recess at the tip of the second boss 54, is fitted to the tip of the first shaft portion 51b, and the shaft portion 51b is fitted to the first boss 53 and the second boss. It does not come off from 54. Further, similarly to the cylindrical portion 52, a fixing groove 54c into which the other end 40b of the urging means 40 is engaged and fixed is formed in the large diameter portion of the outer periphery of the second boss 54.

The spring 55 is the shaft portion 5 of the shaft 51.
It is wound around 1b and is arranged in the large diameter portion of the stepped hole of the first boss 53. Then, since the shaft portion 51b of the shaft 51 penetrating the first boss 53 and the second boss 54 is fixed by the E ring 56, the spring 55 causes the step portion of the stepped hole of the first boss 53 and the shaft 51 to move. Fixed part 51a
Will be compressed to some extent and intervene. As a result, the first boss 53 and the second boss 54 are always urged by the spring 55 in the directions away from each other.

As shown in FIG. 3, the urging means 40 is composed of a torsion spring, and as described above, the urging means 40 is wound around the outer periphery of the small-diameter outer diameter portion of the second boss 54, so that It is sandwiched between the boss 53 and the second boss 54. Further, both ends 40a, 4 of the spring of the biasing means 40 are
As described above, 0b is fixed by engaging with the fixing grooves 52c and 54c formed on the outer circumferences of the first boss 53 and the second boss 54, respectively. The urging means 40 constantly urges the first boss 53 and the second boss 54 in the direction in which the first housing 10 and the second housing 20 are deployed.

The folding locking means 60 includes a third boss 61,
The fourth boss 62 engages with the third boss 61, and the shaft portion 71b of the lock release button 71 and the spring 72 which form the lock release means 70 penetrate through the center thereof.

The unlocking button 71 has a button portion 71a.
And a shaft portion 71b protruding from the button portion 71a, the button portion 71a is disposed on the other end side of the hinge 30, and the shaft portion 71b projects inside the hinge 30 toward the center of the telephone. ing.

The shaft portion 71b has a two-step shape in which the button portion 71a side has a large diameter and the tip side (center side of the hinge) has a small diameter. A spring 72 as an urging member is wound around the large diameter portion of the shaft portion 71b, and is compressed and disposed between the third boss 61 and the button portion 71a as described later.

The lock release button 71 can move axially in the hinge 30 as a whole. That is, the unlocking button 71 has the button portion 71.
A can be elastically pressed from the outside on one end side of the hinge 30 toward the center of the hinge.

The third boss 61 is located inside the hinge locking portion 31, and is disposed in the hinge locking portion 31 so as to be rotatable about the axis. At the center of the third boss 61, a stepped shaft hole having a small diameter on the tip side is formed, and the shaft part 71b of the lock release button 71 is loosely inserted into this shaft hole. There is. In addition, at the tip of this third boss 61,
A concave portion 61a that engages with the convex portion 62a of the fourth boss 62 is formed.

The fourth boss 62 is provided in the hinge engaging portion 34,
It is arranged in contact with the third boss 61. At the center of the fourth boss 62, a stepped shaft hole having a small diameter on the tip side is formed.

The small-diameter portion of the shaft portion 71b of the lock release button 71 penetrates the shaft hole, and the large-diameter portion of the shaft portion 71b abuts the stepped portion formed in the shaft hole. . Further, a key groove 62b with which the key 34a of the hinge engaging portion 34 described above is engaged is formed on the outer periphery of the fourth boss 62.
Is formed.

As a result, the fourth boss 62 is moved in the hinge locking portion 34 along the key groove 62b only in the axial direction by pressing the locking release button 71, and the hinge locking portion 3
The inside of 4 is prevented from rotating in the direction around the axis.

As described above, the fourth boss 62 has, on the contact surface with the third boss 61, the convex portion 62a which engages with the concave portion 61a formed at the tip of the third boss 61. I am doing it. The convex portion 62a of the fourth boss 62 and the third boss 61
The concave portion 61a is formed in a direction in which the first casing 10 and the second casing 20 are engaged with each other when they are folded.

The concave portion 61a of the third boss 61 and the convex portion 62a of the fourth boss 62 smoothly engage and disengage the concave and convex portions, as in the case of the first boss 53 and the second boss 54 described above. As described above, in this embodiment, each is formed with an inclination. An E-ring 73 for fixing is fitted to the tip of the shaft portion 71b of the lock release button 71 penetrating the fourth boss 62, similarly to the shaft portion 51b of the shaft 51 described above. 71b is the third boss 61 and the fourth boss 6.
It is designed not to get out of 2.

The spring 72 is wound around the outer peripheral large diameter portion of the shaft portion 71b of the locking release button 71, and is arranged in the large diameter portion of the stepped hole of the third boss 61. Then, since the shaft portion 71b of the lock release button 71 penetrating the third boss 61 and the fourth boss 62 is fixed by the E-ring 73, the spring 72 serves as a step portion of the stepped hole of the third boss 61. The button portions 71a are interposed with being compressed to some extent.

That is, the lock release button 71 and the third boss 61 are always urged in the opposite directions by the spring 72. As a result, the lock release button 71 can be repeatedly pressed with elasticity from the outside of the other end of the hinge 30 toward the center of the telephone.

Next, the operation of the automatic open type folding portable telephone of this embodiment having the above-mentioned structure will be described. First, when the telephone is not used, the first housing 1
0 and the second housing 20 against the biasing force of the biasing means 40,
Fold through the hinge 30.

When the hinge 30 is folded, the urging means 40 composed of a torsion spring is twisted and wound, so that the urging force acts in the developing direction of the housing, but the surfaces where the third boss 61 and the fourth boss 62 contact each other. The unevenness of the first housing 10 engages while being pressed by the biasing force of the spring 72.
Then, the second housing 20 is locked in the folded state. Therefore, in this state, the telephone can be carried by storing it in a pocket, a bag or the like.

When using the telephone, first, hold the folded telephone in one hand and press the button portion 71a of the lock release button 71 inward with the thumb or the like. When the lock release button 71 is pushed in, the shaft portion 71b
Moves toward the center of the hinge against the spring 72, so that the large-diameter step portion of the shaft portion 71 b presses the step portion of the shaft hole of the fourth boss 62.

As a result, the fourth boss 62 is pressed and moved toward the center of the hinge, and the uneven engagement with the third boss 61 is released, so that the restoring force of the torsion spring of the biasing means 40 causes the second boss 62 to move. The boss 63 rotates in the direction of arrow A in FIG. 3, and the first housing 10 automatically expands. As mentioned above,
Since the concave-convex portions 61a and 62a of the third boss 61 and the fourth boss 62 have an inclined shape, engagement and disengagement of the third boss 61 and the fourth boss 62 operate smoothly.

When the first casing 10 is opened to a predetermined deployment angle, the concavities and convexities of the abutting surfaces of the first boss 53 and the second boss 54 are engaged while being pressed by the spring 55, so that a so-called latch is provided in the deployed state. The first housing 10
And the second housing 20 are fixed at a predetermined deployment angle. In this case as well, since the concave and convex portions 53a and 54a of the first boss 53 and the second boss 54 are inclined, the engagement and disengagement of the first boss 53 and the second boss 54 operate smoothly. .

After using the telephone, the first casing 10 is folded in the direction of arrow B shown in FIG. 3 against the urging force of the urging means 40. When the first housing 10 is folded, the second boss 54
Rotational force is applied to. Here, the convex portion 54a of the second boss 54
Since the concave portion 53a of the first boss 53 and the concave portion 53a of the first boss 53 are inclined with respect to each other, the convex portion 54a to which the rotational force is applied pushes the concave portion 53a outward against the urging force of the spring 55, and the relationship between the two is increased. It is out of sync.

As a result, the first boss 53 and the second boss 54 are
The disengaged first housing 10 and the second housing 20 can be folded via the hinge 30 against the biasing force of the biasing means 40. When both the housings are folded, as described above, the uneven portions 61a and 6 of the third boss 61 and the fourth boss 62 are formed.
Since the 2a is engaged, the first housing 10 and the second housing 20 are locked in the folded state.

As described above, according to the folding type portable telephone of the present embodiment, the biasing means 40, the expansion locking means 50, and the folding locking means 6 for unfolding and holding the folding of the telephone.
0 and the unlocking means 70 are all housed in the hinge 30 and incorporated as unit parts, so that the housing 1
The mounting structure of 0 and 20 is not restricted at all, the degree of freedom in designing the mobile phone is increased, and the size and weight of the phone itself can be reduced.

Further, the biasing means 40 and the expansion locking means 5
0, the fold locking means 60 and the unlocking means 70 can be used as a common component in a wide variety of foldable mobile phones by using them as unit components. It is also possible to reduce the cost of the product.

In this embodiment, the biasing means 40 and the expansion locking means 50, the folding locking means 60 and the locking release means 70 are constructed as two unit parts. If the portion 51b and the shaft portion 71b of the lock release button 71 are connected, they can be configured as one unit component.

[0062]

As described above, according to the foldable portable telephone of the present invention, the degree of freedom in designing the telephone body is secured by accommodating all the means for unfolding and folding the telephone in the hinge. In addition to being able to meet the demand for weight reduction and size reduction of the telephone, it also has versatility as a component.

[Brief description of drawings]

FIG. 1 is an overall perspective view showing an embodiment of a foldable mobile phone of the present invention in a state where a housing is expanded.

FIG. 2 is an exploded perspective view of essential parts showing the structure of a hinge of the folding mobile phone of the present embodiment shown in FIG.

FIG. 3 is an overall exploded perspective view in which the structure of the hinge shown in FIG. 2 is further exploded.

FIG. 4 is a partially cutaway front view showing the structure of the hinge of the folding mobile phone of this embodiment shown in FIG.

FIG. 5 is an overall perspective view showing a conventional foldable mobile phone with a housing unfolded.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... 1st housing 20 ... 2nd housing 30 ... Hinge 40 ... Energizing means 50 ... Expansion locking means 60 ... Folding locking means 70 ... Lock releasing means

Claims (5)

[Claims] 1. A first casing having at least a handset and a second casing having at least a transmitter, the first and second casings being rotatably coupled via a hinge and deployed. In a foldable mobile phone that can be folded freely, a biasing unit that biases the first casing and the second casing in a direction in which the first casing and the second casing are always deployed in the hinge, and a biasing force against the biasing unit. And a locking means for locking the first housing and the second housing in a folded state, and a locking releasing means for unlocking the locking by the folding locking means. Foldable mobile phone. 2. The folding mobile phone according to claim 1, wherein the biasing means is a torsion spring. 3. The foldable mobile phone according to claim 1, further comprising: deployment locking means for locking the first housing and the second housing in a state where the first housing and the second housing are deployed at a constant angle in the hinge. 4. The shaft, wherein the expansion locking means is arranged on the other end side of the hinge, and the shaft loosely penetrates in the center so as to be axially movable in the hinge, and the hinge. A first boss that is rotatable in an axial direction inside, the shaft loosely penetrates around the center, and engages with the first boss when the first housing and the second housing are deployed, and the hinge A second boss that is movable only in the axial direction inside, and a biasing member that is interposed between the shaft and the first boss and constantly biases the first boss toward the second boss, The torsion spring is wound around the outer periphery of the second boss, and both ends of the spring are fixed to the first boss and the second boss, respectively, and the first boss and the second boss are always the first and second bosses. The foldable mobile phone according to claim 3, wherein the foldable mobile phone is urged in a direction in which the housing is deployed. 5. The folding locking means includes a third boss rotatable in an axial direction in the hinge, and when the first casing and the second casing are folded on the third boss. A fourth boss that is engaged with and is movable only in the axial direction within the hinge, and the locking release means is disposed movably in the axial direction within the hinge, and the third boss A lock release button that has a shaft portion that penetrates a boss and presses the fourth boss in a direction away from the third boss, and that can be pressed from one end side of the hinge toward the center of the hinge; The folding mobile phone according to claim 1 or 2, further comprising: a biasing member that is interposed between the button and the third boss and that always biases the lock release button and the third boss in opposite directions.