DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0023] An embodiment of the invention will be described below with reference to the drawings.

[0024] A folding mobile wireless device according to the embodiment will be described as a folding mobile telephone device 100 comprising a receiver (speaker) to be a receiving unit and a microphone to be a transmitting unit.

[0025] As shown in FIGS. 1 ( a ) and 1 ( b ), the folding mobile telephone device 100 according to the embodiment has an upper housing (first housing) 10 formed of a metal (magnesiumn) and a lower housing (second housing) 20 formed of a resin, and has such a structure that the upper housing 10 and the lower housing 20 are rotatably coupled to each other through a hinge portion 30 . The hinge portion 30 has a first connecting portion 31 provided in the upper housing 10 , a second connecting portion 32 provided in the lower housing 20 and coupling pins 33 .

[0026] The upper housing 10 of the folding mobile telephone device 100 is rotated around the hinge portion 30 and can be thereby folded such that the upper housing 10 abuts or almost abuts on the lower housing 20 . As a result, a folding state can be brought as shown in FIG. 2 .

[0027] As shown in FIG. 2 , the folding mobile telephone device 100 comprises a speaker 15 for making an incoming sound, a subinformation display portion 16 such as a liquid crystal display panel for displaying a telephone number of a sender during call incoming, and a back key 17 for executing the record of a voice by pressing during use which are provided on the outside surface of the upper housing 10 . Moreover, an antenna housing portion 42 for accommodating an antenna 40 is provided in substantially parallel with the longitudinal direction of the lower housing 20 on one of the side surfaces of the lower housing 20 (on this side in FIG. 2 and the left side in FIG. 1 ( a )). The antenna 40 is extendably provided in the lower housing 20 , and is pulled out toward the upper housing 10 as shown in FIGS. 1 ( a ) and 1 ( b ) during extension and is accommodated in the antenna housing portion 42 leaving a tip portion 40 a as shown in FIG. 2 during accommodation. Moreover, the side portion of the antenna housing portion 42 is provided with a finger put concave portion 42 a for preventing a finger from coming in contact with the antenna 40 when holding the folding mobile telephone device 100 .

[0028] As shown in FIG. 1 ( a ), the upper housing 10 and the lower housing 20 have dimensions in a transverse direction (dimensions in a lateral direction in FIG. 1 ( a )) reduced toward the hinge portion 30 side, respectively. Thus, the holding stability and design property of the housing can be enhanced. The appearance of such a housing can be obtained by the structure of the hinge portion which will be described below.

[0029] As shown in FIGS. 1 ( a ) and ( b ), the upper housing 10 of the folding mobile telephone device 100 includes a receiving unit having a receiver 12 for making a sound such as a voice during a call, a main information display portion 14 such as a liquid crystal display panel, and the like. A portion of the upper housing 10 which is adjacent to the lower housing 20 is provided with a first connecting portion 31 having a plurality of cylindrical portions 31 a and 31 b . Moreover, the lower housing 20 includes a transmitting unit having a microphone 22 for detecting a sound such as a voice during a call, a key operating portion 24 and a battery 26 . A portion of the lower housing 20 which is adjacent to the upper housing 10 is provided with a second connecting portion 32 having a plurality of cylindrical portions 32 a, 32 b and 32 c . Reinforcing members 34 (see FIGS. 3 ( a ) and 3 ( b )) are provided integrally with the cylindrical inner peripheral surfaces of the cylindrical portions 32 a and 32 c of the second connecting portion 32 , which will be described below. The key operating portion 24 of the lower housing 20 includes a power ON/OFF switch of the folding mobile telephone device 100 , a key for inputting alphanumeric characters and letters, and a function key for selectively executing various functions.

[0030] Furthermore, the lower housing 20 accommodates a main circuit board (not shown) including a wireless circuit which mounts electronic parts such as a CPU for processing various signals and a memory for storing various information. This is fixed into the lower housing 20 through a support member formed integrally with the lower housing 20 .

[0031] Moreover, an auxiliary circuit board (not shown) including a driver circuit for the main information display portion 14 is accommodated in the upper housing 10 and is similarly fixed into the upper housing 10 through the support member. The main circuit board and the auxiliary circuit board are connected to each other through a flexible circuit (not shown), and various electrical signals are sent and received between the mutual circuit boards. A flexible board couples the circuit boards through the inside of the hinge portion 30 .

[0032] Next, detailed description will be given to the coupling structure of the first connecting portion 31 of the upper housing 10 and the second connecting portion 32 of the lower housing 20 in the folding mobile telephone device 100 having the structure described above.

[0033] The cylindrical portions 31 a and 31 b of the first connecting portion 31 and the cylindrical portions 32 a, 32 b and 32 c of the second connecting portion alternately provided, respectively. More specifically, as shown in FIG. 1 ( a ), the cylindrical portion 32 b of the second connecting portion 32 is provided substantially on the center of the hinge portion 30 and the cylindrical portions 31 a and 31 b of the first connecting portion 31 are provided on both sides. Furthermore, the cylindrical portions 32 a and 32 c of the second connecting portion 32 constituting both ends of the hinge portion 30 are provided adjacently to the cylindrical portions 31 a and 31 b of the first connecting portion 31 , respectively.

[0034] When the coupling pins 33 are inserted from both ends into the connecting portions 31 and 32 , the first connecting portion 31 and the second connecting portion 32 are coupled to each other.

[0035] FIGS. 3 ( a ) and 3 ( b ) are an exploded perspective views illustrating the structures of the first connecting portion 31 of the upper housing 10 , the second connecting portion 32 of the lower housing 20 and the coupling pin 33 coupling them in the folding mobile telephone device 100 .

[0036] As shown in FIG. 3 ( a ), the cylindrical reinforcing members 34 formed of stainless are formed integrally with the cylindrical portions 32 a and 32 c through insert molding and the like over the inner peripheral surfaces of the cylindrical portions 32 a and 32 c constituting both ends of the hinge portion 30 . The inner peripheral surface 30 a of the reinforcing member 34 is provided with a concave portion 36 a (see FIG. 3 ( b )) to be fitted on a convex portion 33 d formed on the outer peripheral surface of the coupling pin 33 which will be described below. Moreover, inner peripheral surfaces 30 b of the cylindrical portions 31 a and 31 b adjacent to the cylindrical portions 32 a and 32 c is also provided with a concave portion 36 b to be fitted on convex portions 33 e formed on the outer peripheral surface of the coupling pin 33 which will be described below.

[0037] The flexible board for connecting the main circuit board and the auxiliary circuit board is accommodated in an inside space constituted by a part of the cylindrical portion 31 b and the cylindrical portion 32 b which constitute a central part of the hinge portion 30 between the cylindrical portion 31 a and the cylindrical portion 31 b , which is not shown.

[0038] The coupling pin 33 has a cylindrical outside portion 33 a , a cylindrical inside portion 33 b and an engagement click 33 c formed integrally with the inside portion 33 b at the end of the coupling pin 33 . The outside portion 33 a and the inside portion 33 b are rotatably connected to each other, and the inside portion 33 b has such a structure that resistance force is increased by a control mechanism, which is not shown, in the outside portion 33 a when a rotating angle is increased and the resistance force is eliminated when the rotation is carried out by a predetermined angle. Moreover, the convex portions 33 d and 33 e are formed on the outer peripheral surfaces of the outside portion 33 a and the inside portion 33 b. Furthermore, the coupling pin 33 is formed of a resin having a proper hardness.

[0039] When the coupling pin 33 is inserted into the hinge portion 30 , the outside portion 33 a of the coupling pin 33 is accommodated in the cylindrical portions 32 a or 32 c of the second connecting portion 32 , and the inside portion 33 b of the coupling pin 33 is accommodated in the cylindrical portions 31 a or 31 b of the first connecting portion 31 . At this time, the convex portions 33 d and 33 e formed on the outer peripheral surface of the coupling pin 33 are fitted in the concave portions 36 a and 36 b formed on the inner peripheral surfaces 30 a and 30 b, respectively. Thus, the outside portion 33 a and the inside portion 33 b in the coupling pin 33 are prevented from being relatively moved with respect to the inner peripheral surfaces 30 a and 30 b , respectively. Furthermore, when the coupling pins 33 are inserted up to a predetermined position in the hinge portion 30 , each engagement click 33 c is engaged with the end walls of the cylindrical portions 31 a or 31 b in the first connecting portion 31 , and the first connecting portion 31 and the second connecting portion 32 are coupled to each other through the coupling pins 33 .

[0040] In the folding mobile telephone device 100 having the structure described above, when the upper housing 10 and the lower housing 20 are rotated around the hinge portion 30 and are thus unfolded or folded, the outside portion 33 a and the inside portion 33 b in the coupling pin 33 provided in the hinge portion 30 are rotated relatively. Furthermore, the unfolding and folding states of the folding mobile telephone device 100 are controlled by the resistance force generated when the outside portion 33 a and the inside portion 33 b in the coupling pin 33 are rotated. For example, when the upper and lower housings 10 and 20 are to be unfolded from the folding state of the folding mobile telephone device 100 , the outside portion 33 a and the inside portion 33 b are rotated against an increase in the resistance force generated in the coupling pin 33 so that the upper and lower housings are unfolded.

[0041] By providing the metallic reinforcing members 34 on the inner peripheral surfaces of the cylindrical portions 32 a and 32 c constituted by the resin as in the embodiment, a strength against deformation or abrasion can be enhanced over the inner peripheral surfaces of the cylindrical portions 32 a and 32 c in the second connecting portion 32 formed of a resin. Moreover, when the upper housing 10 and the lower housing 20 are rotated around the hinge portion 30 and are thereby unfolded or folded, the outside portion 33 a of the coupling pin 33 is moved relatively in the cylindrical portions 32 a and 32 c of the second connecting portion 32 so that the end walls of the concave portion 36 a in the cylindrical portions 32 a and 32 c can be prevented from being abraded and worn.

[0042] Accordingly, even if the upper housing 10 and the lower housing 20 are often rotated around the hinge portion 30 and are thus unfolded and folded, the upper and lower housings 10 and 20 can be coupled stably.

[0043] The invention is not restricted to the embodiment but can be properly changed and modified.

[0044] While the reinforcing member 34 is provided in the cylindrical portions 32 a and 32 c of the second connecting portion 32 in the embodiment, it may be provided in the cylindrical portions 31 a and 31 b of the first connecting portion 31 if the strengths of the cylindrical portions 31 a and 31 b in the first connecting portion 31 are to be enhanced.

[0045] Moreover, while the upper and lower housings 10 and 20 are constituted by different materials in the embodiment, they may be constituted by the same material. In that case, the reinforcing member 34 may be provided on both the first connecting portion 31 and the second connecting portion 32 .

[0046] As described above, according to the folding mobile wireless device of the invention, a predetermined strength can be maintained for the hinge portion.