JP4079126B2 - Hinge structure - Google Patents

Description

The present invention relates to Ruhi Nji structure put in a folding-type electronic devices.

  In a conventional mobile phone or the like, there is a so-called foldable mobile phone in which a display unit housing having a display unit and an operation unit housing having an operation unit are connected to be folded and overlapped by a hinge unit. . A flexible printed circuit board (FPC), a cable, and the like that connect the display unit housing and the operation unit housing are disposed in the hinge unit.

At the connection between the hinge part and the display part case or the operation part case, water or dust that has entered through the gaps in the hinge part will enter the display case or operation part case through the FPC or cable. In order to prevent this, for example, there is a waterproof structure in which an FPC or cable is sandwiched between packings and a gap is closed (see Patent Document 1).
JP 2004-47968 A

However, in the waterproof structure described above, water and dust enter the gaps between the hinge portions, and thus there is a problem that water and dust adhere to the FPC and the cable of the hinge portion. An object of the present invention is to provide with passing the wire therein, the Ruhi Nji structure can prevent intrusion of such as water and dust.

In order to solve the above-described problems, the invention described in claim 1 is a hinge structure that foldably connects a first housing and a second housing, the second housing of the first housing, A first bearing having a through hole whose central axis coincides with the folding shaft is provided at one end of the connecting portion side, and the central axis coincides with the folding shaft at the other end and faces the first bearing. A first cylindrical portion having an opening communicating with the inside of the first housing is provided at an end portion in the axial direction, and a connecting portion side of the second housing with the first housing is provided at a central portion. And a second bearing having a hole recessed in the axial end facing the first bearing and communicating with the interior of the second housing at the axial end facing the first tubular portion. to the second cylindrical portion having an opening is provided, wherein the first cylindrical portion and the second cylindrical portion, the end portion of the opening side of the second cylindrical portion is first Is inserted into Jo opening side end portion of the conjunction is assembled rotatably in the circumferential direction from each other, between the inner peripheral surface of the assembly portion of the first cylindrical portion and the second cylindrical portion Is closed by a water-stop material , and the first bearing and the second bearing include a columnar hinge unit in which a distal end side member and a proximal end side member are assembled in a circumferentially rotatable manner. It is inserted from the first bearing side to the second bearing side and is rotatably connected .

According to the first aspect of the present invention, the end portion on the opening side of the second cylindrical portion of the second casing is inserted into the end portion on the opening side of the first cylindrical portion of the first casing. Therefore, the interiors of the first housing and the second housing can be made into an integrated space.

Further, the second cylindrical portion is assembled to the first cylindrical portion so as to be rotatable in the circumferential direction , and the first bearing and the second bearing are composed of a distal end side member and a proximal end side member. Since the columnar hinge units are assembled so as to be rotatable in the circumferential direction , the first casing and the second casing can be rotated with respect to each other. Further, the water-stopping material can prevent water and dust from entering the first housing and the second housing .

According to a second aspect of the invention, a hinge structure according to claim 1, through the opening of the opening portion of the first cylindrical portion and said second cylindrical portion, of the first housing A flexible printed circuit board (FPC 80) having both ends connected to a printed wiring board provided inside and inside the second casing is provided.

According to the second aspect of the present invention, information can be transmitted between the printed wiring boards provided in the first housing and the second housing using the flexible printed circuit board.

According to a third aspect of the invention, a hinge structure according to claim 1, for example, as shown in FIG. 6, the first connected to the printed circuit board provided inside the first housing An optical transmitter / receiver element (optical transmitter / receiver element 81), and a second optical transmitter / receiver element (optical transmitter / receiver element 82) connected to a printed wiring board provided in the second housing; The second optical transmitter / receiver element transmits information to each other through light through an assembly portion of the opening portion of the first tubular portion and the opening portion of the second tubular portion.

According to the third aspect of the present invention, information is mutually transmitted between the printed wiring boards provided in the first casing and the second casing by using the first optical transmitting / receiving element and the second optical transmitting / receiving element. Can be transmitted.

The invention described in claim 4 is the hinge structure according to claim 1, wherein said causing said second cylindrical portion in a state assembled to the first tubular portion An annular member (spacer 50) having a hole into which the columnar hinge unit 60 is inserted at the center is formed in a gap between one bearing (display unit side bearing 32) and the second bearing (operation unit side bearing 12). The columnar hinge unit is inserted from the first bearing side to the second bearing side in a state where the annular member is disposed .

  According to the sixth aspect of the present invention, the annular member restricts the movement of the second cylindrical portion in the axial direction, and the end portion (inner cylindrical portion 41) on the opening side of the second cylindrical portion is the first. It is possible to prevent the cylindrical portion from falling off from the end portion (outer cylindrical portion 21) on the opening side. Further, the columnar hinge unit 60 can be covered with the annular member.

The invention described in claim 5 is the hinge structure according to any one of claims 1-4, wherein the second cylindrical portion, with respect to the second housing, said fold axis A member that is rotatably assembled around an orthogonal axis, and includes a third cylindrical portion that protrudes toward the second casing, and the third cylindrical section is provided in the second casing. Inserted into the fourth cylindrical part and assembled to the fourth cylindrical part so as to be rotatable in the circumferential direction, and inside and outside of the assembly part of the third cylindrical part and the fourth cylindrical part It is characterized in that the space between the peripheral surfaces is blocked by a water stop material.

According to the invention described in claim 5 , since the third cylindrical portion provided in the second cylindrical portion is inserted into the fourth cylindrical portion provided in the second casing , the second cylinder The inside of the shape part and the second housing can be made into an integral space.

In addition, since the third cylindrical portion is assembled so as to be rotatable in the circumferential direction with respect to the fourth cylindrical portion, the second cylindrical portion and the second casing can be rotated with respect to each other. Moreover, the water-stopping material can prevent water and dust from entering the second cylindrical portion and the inside of the second housing .

Further, since the third cylindrical portion is provided perpendicular to the second cylindrical portion, the second housing relative to the second cylindrical portion, the rotating direction perpendicular to the first housing of the second tubular portion It can be assembled freely in any direction. Therefore, the second housing can be rotated about two axes with respect to the first housing .

The invention described in claim 6 is the hinge structure of claim 5, an annular hinge unit and the first annular member and the second annular member is assembled rotatably in the circumferential direction from each other the One annular member is connected to a tip portion of the third cylindrical portion, and a second annular member of the annular hinge unit is connected to the fourth cylindrical portion .

According to invention of Claim 6 , it can prevent that a 3rd cylindrical part falls off from a 4th cylindrical part by an annular hinge unit. In addition, information can be transmitted between the first casing and the second casing through wiring such as a flexible printed board or light to the central portion of the annular hinge unit.

The invention described in claim 7 is the hinge structure according to claim 5 or 6, a first light emitting and receiving elements provided in the first casing, is provided inside of the second housing The second optical transmitter / receiver element (optical transmitter / receiver element 83) and the second cylindrical part are provided inside the second cylindrical portion , and reflect light emitted from the first optical transmitter / receiver element or the second optical transmitter / receiver element at a right angle. And a mirror 48 for transmitting to the second optical transceiver element or the first optical transceiver element.

According to the seventh aspect of the present invention, information can be transmitted between the first optical transceiver and the second optical transceiver via the mirror.

According to the present invention, since the end portion on the opening side of the second cylindrical portion of the second housing is inserted into the end of the opening side of the first cylindrical portion of the first housing, the 1 may be a housing and an internal integral space of the second housing, also, the second cylindrical portion is assembled rotatably in the circumferential direction with respect to the first tubular portion, and the first Since the bearing and the second bearing are connected by a columnar hinge unit in which the distal end side member and the proximal end side member are rotatably assembled to each other in the circumferential direction, the first casing and the second casing Can be made mutually rotatable. Further, the water-stopping material can prevent water and dust from entering the first housing and the second housing .

  Hereinafter, a first embodiment of the present invention will be described. FIG. 1 is an overall view showing a wireless communication apparatus to which the present invention is applied. The wireless communication apparatus includes a display unit case 30 having a display unit 31 and an operation unit case 10 having an operation unit 11.

  The operation unit housing 10 and the display unit housing 30 have a flat plate shape, and the printed wiring boards 13 and 33 and other devices are accommodated therein. A hinge structure is formed between the operation unit casing 10 and the display unit casing 30, and the operation unit casing 10 and the display unit casing 30 are connected so as to be folded and overlapped.

  FIG. 2 is a cross-sectional view of a principal part showing a hinge structure of a wireless communication apparatus to which the present invention is applied. As shown in FIG. 2, the hinge structure of the present embodiment includes an operation unit housing 10, a display unit housing 30, a spacer 50, and a columnar hinge unit 60.

As shown in FIG. 2, the upper end of the operation unit housing 10 is provided with an operation unit side cylindrical portion 20 at the right end and an operation unit side bearing 12 at the left end.
The operation portion side tubular portion 20 has a cylindrical shape with the left-right direction as an axial direction. The inside of the operation unit side tubular portion 20 communicates with the inside of the main body of the operation unit casing 10. Further, an outer cylinder portion 21 is provided at the left end portion of the operation portion side cylindrical portion 20.

  The inner diameter of the outer cylinder part 21 is substantially equal to the outer diameter of the inner cylinder part 41 of the display unit housing 30 described later. Moreover, as shown in FIG. 3, the outer cylinder part 21 is provided with an opening 22 on the left side. The inner cylinder 41 is inserted into the opening 22.

  The operation unit side bearing 12 has a cylindrical shape with the left-right direction as an axial direction, and has a hole 12a in the center in the left-right direction as shown in FIG. The inner diameter of the hole 12a is equal to or larger than the outer diameter of a columnar hinge unit 60 described later. The operation unit side bearing 12 supports the columnar hinge unit 60.

A display unit side tubular portion 40 is provided at the center of the lower portion of the display unit housing 30. The display portion side tubular portion 40 has a cylindrical shape with the left-right direction as an axial direction. The inside of the display unit side tubular unit 40 communicates with the inside of the main body of the display unit housing 30.
An inner cylinder portion 41 is provided at the right end portion of the display portion side tubular portion 40, and a display portion side bearing 32 is provided at the left end portion.

  The outer diameter of the inner cylinder part 41 is substantially equal to the inner diameter of the outer cylinder part 21. Further, a water stop material 43 such as an O-ring or an oil seal is provided on the outer peripheral portion of the inner cylinder portion 41. When the inner cylinder part 41 is inserted into the outer cylinder part 21, the water blocking material 43 closes the gap between the outer cylinder part 21 and the inner cylinder part 41 in a watertight manner. As shown in FIG. 3, an opening 42 is provided on the right side of the inner cylinder portion 41. The inner cylinder part 41 is slidable in the circumferential direction with respect to the outer cylinder part 21 via a water stop material 43.

  A flexible printed circuit board (FPC 80) that connects the printed circuit board 33 of the display unit and the printed circuit board 13 of the operation unit passes through the opening 42. The FPC 80 is spirally wound twice between the display unit side cylindrical unit 40 and the operation unit side cylindrical unit 20 to secure the amount of movement in the left-right direction and reduce the shape change caused by the rotational movement. ing. Both ends of the FPC 80 are connected to connectors 14 and 34 provided on the printed wiring boards 13 and 33 of the display unit housing 30 and the operation unit housing 10.

The display unit side bearing 32 has a cylindrical shape with the horizontal direction as the axial direction. On the left side of the display unit side bearing 32, a hole 32a having an inner diameter substantially equal to the outer diameter of a columnar hinge unit 60 described later is provided. The hole 32 a does not communicate with the inside of the display unit side tubular portion 40.
The width from the right end of the inner cylinder part 41 to the left end of the display part side bearing 32 is substantially equal to the width from the right end of the operation part side bearing 12 to the left end of the outer cylinder part 21.

A spacer 50 is provided between the left end of the display unit side bearing 32 and the right end of the operation unit side bearing 12. The spacer 50 has an annular shape, and as shown in FIG. 3, a hole 50a equal to the inner diameter of the hole 12a and the hole 32a is provided in the center in the left-right direction. The left and right width of the spacer 50 is substantially equal to the left and right width of the inner cylinder portion 41.
A columnar hinge unit 60 is inserted into the holes 12a, 50a, 32a.

  The columnar hinge unit 60 has a cylindrical shape and includes an operation unit side fixing unit 61 fixed to the operation unit side bearing 12 and a display unit side fixing unit 62 fixed to the display unit side bearing 32. The operation unit side fixing unit 61 and the display unit side fixing unit 62 rotate and move in the circumferential direction, but the torque increases at two predetermined positions. The operation unit housing 10 and the display unit housing 30 are fixed by being folded and overlapped or opened at these two positions.

  Here, the assembly method of said hinge structure is demonstrated. First, as shown in FIG. 3, the display unit side cylindrical part 40 of the display unit casing 30 is arranged between the operation unit side cylindrical part 20 and the operation unit side bearing 12 of the operation unit casing 10, and then The inner cylinder part 41 of the display part side cylindrical part 40 is inserted into the outer cylinder part 21 of the operation part side cylindrical part 20 (arrow (1)). Then, a gap having the same width as the left and right width of the inner cylinder part 41 inserted in the outer cylinder part 21 is generated between the display part side bearing 32 and the operation part side bearing 12. In this gap, the spacer 50 is inserted from the direction perpendicular to the paper surface in FIG. 3 (arrow (2)). Finally, the columnar hinge unit 60 is inserted and fixed to the operation unit side bearing 12, the spacer 50, and the display unit side bearing 32 (arrow (3)). Thus, the hinge structure is formed.

  According to such a hinge structure, the operation unit casing 10 and the display unit casing 30 are separated from each other by the outer cylinder portion 21 of the operation unit casing 10 and the inner cylinder portion 41 of the display unit casing 30. The operation unit housing 10 and the display unit housing 30 are prevented from entering water or dust from the gap into the operation unit housing 10 or the display unit housing 30. And can be opened and closed.

  In the above-described embodiment, the operation unit casing 10 and the display unit casing 30 are folded and overlapped with the operation unit casing 10 and the display unit casing 30 or are fixed in an open state. The magnet may be provided, and a simple structure using a shaft bar instead of the columnar hinge unit 60 may be used.

  Next, a second embodiment of the present invention will be described. As shown in FIG. 4, the hinge structure of the present embodiment includes an operation unit casing 10, a display unit casing 30, and an annular hinge unit 70.

  In the present embodiment, the inner cylinder part 41 is inserted into the outer cylinder part 21, and the inner cylinder part 41 is slidable in the circumferential direction with respect to the outer cylinder part 21 via the water stop material 43. 4, except that a partition plate 24 is provided on the right side of the outer cylinder portion 21 so as to be separated from the outer cylinder portion 21 as shown in FIG. And the point which does not have the display part side bearing 32, the point by which the annular hinge unit 70 is accommodated in the operation part side cylindrical part 20, and the point by which the through-hole penetrated in the left-right direction is provided in the center of the annular hinge unit 70. Different from the first embodiment.

An annular hinge unit 70 is fixed between the outer cylinder portion 21 and the partition plate 24. As shown in FIG. 4, the annular hinge unit 70 has a cylindrical shape, and a through hole is provided in the center in the left-right direction. The inner diameter of the through hole is substantially equal to the inner diameter of the inner cylinder portion 41, and the FPC 80 passes through the inside. The annular hinge unit 70 includes a first fixed ring 71 fixed to the partition plate 24 and a second fixed ring 72 fixed to the inner cylinder portion 41.
The partition plate 24 has a hole 25 at a position corresponding to the through hole of the annular hinge unit 70.

FIG. 5 is a cross-sectional view taken along the line aa in FIG. As shown in FIG. 5, a fitting piece 24 a is provided on the left side of the partition plate 24, and a fitting groove 73 is provided on the right side of the first fixed ring 71. A fitting piece 42a is provided at the right end of the inner cylinder portion 41 where the opening 42 is provided, and a fitting groove 74 is provided on the left side of the second fixed ring 72. ing.

In order to assemble the hinge structure, first, the inner cylinder part 41 is inserted into the outer cylinder part 21. Next, the annular hinge unit 70 is pushed up from the inside of the operation unit housing 10 between the outer cylinder part 21 and the partition plate 24 (the white arrow in FIG. 4), and the fitting piece 24 a and the fitting groove 73 are moved. Fit. Finally, the FPC 80 is folded and passed through the hole 25 of the partition plate 24 and the annular hinge unit 70, and both ends are connectors provided on the printed circuit boards 13 and 33 of the display unit housing 30 and the operation unit housing 10. Connect to.

  As described above, in the present embodiment, by fitting the annular hinge unit 70 to the partition plate 24 and the inner cylinder part 41, it is possible to prevent the inner cylinder part 41 from falling off the outer cylinder part 21. Moreover, the spacer 50 becomes unnecessary and the number of parts can be reduced.

  In this embodiment, since the FPC 80 is passed through the annular hinge unit 70, in order to reduce the hinge structure, it is necessary to pass the FPC 80 in a narrower place than in the first embodiment. Therefore, the FPC 80 is folded and passed through the annular hinge unit 70, and the FPC 80 is wound around the operation unit side cylindrical unit 20 or the display unit side cylindrical unit 40 to reduce the shape change caused by the rotational motion.

  Further, instead of connecting the connectors 14 and 34 of the printed circuit boards 13 and 33 of the display unit housing 30 and the operation unit housing 10 by the FPC 80, the printed circuit board 13 of the operation unit is partitioned as shown in FIG. Arranged up to the right side of the hole 25 of the plate 24, the printed wiring board 33 of the display unit is arranged up to the left side of the inner cylinder part 41, and the printed wiring board 13 on the right side of the hole 25 of the partition plate 24 and the inner cylinder part 41 Opposite optical transmission / reception elements 81 and 82 are provided on the left printed wiring board 33, and both pass light through the holes 25 of the partition plate 24, the annular hinge unit 70, the outer cylinder part 21, and the inner cylinder part 41. Information can be transmitted and received between the display unit housing 30 and the operation unit housing 10. For this reason, the through-hole of the annular hinge unit 70 can be made small enough to allow light to pass through, and the hinge structure can be made small.

  FIG. 7 is a cross-sectional view of the relevant part showing a third embodiment of the present invention. In the present embodiment, the display unit side cylindrical unit 40 is independent of the display unit housing 30.

  As shown in FIG. 7, the display portion side tubular portion 40 is provided with a second inner tubular portion 44 perpendicular to the inner tubular portion 41. An opening 45 communicating with the inside is provided at the upper end of the second inner cylinder portion 44.

Similar to the inner cylinder part 41, a water stop material 46 is provided on the outer peripheral part of the second inner cylinder part 44. In addition, the display unit housing 30 is provided with a second outer tube portion 37 perpendicular to the outer tube portion 21 of the operation unit housing 10, and the second outer tube portion 37 is disposed above the second outer tube portion 37 . A second partition plate 35 is provided apart from the outer cylinder portion 37 . An opening 38 that communicates with the inside of the display unit housing 30 is provided at the lower end of the second outer cylinder portion 37 . From the opening 38 , the second inner cylinder part 44 is inserted into the second outer cylinder part 37 .

Like the inner cylinder part 41 and the partition plate 24, a fitting piece (not shown) is provided opposite to the end part of the second inner cylinder part 44 where the opening 45 is provided and the lower surface of the second partition plate 35. It has been. An annular hinge unit 77 having a fitting groove (not shown) at both upper and lower ends and a through-hole penetrating vertically is inserted into the second inner cylinder portion 44 and the second partition plate 35, and the display portion side cylindrical portion 40 is inserted. Are connected to the display unit housing 30. The annular hinge unit 77 is the same as that used in the second embodiment, and includes a third fixed ring 75 fixed to the second partition plate and an opening of the second inner cylinder portion 44. And a fourth fixed ring 76 fixed to 45. Thereby, the 2nd inner cylinder part 44 can be prevented from falling out from the 2nd outer cylinder part 37 similarly to 2nd Embodiment.

The second partition plate 35 has a hole 36 at a position corresponding to the through hole of the annular hinge unit 77 . The right side of the printed circuit board 13 than the hole 25 of the partition plate 24, and, in the second partition plate 35 above the printed circuit board 33 than the hole 36 of the light emitting and receiving elements 81 and 83 are respectively provided Yes.

  The inside of the second inner cylinder part 44 communicates with the inside of the inner cylinder part 41 via the mirror chamber 47. A mirror 48 is disposed inside the mirror chamber 47. The mirror 48 reflects light transmitted from one of the optical transmitting / receiving elements 81 and 83 provided on the printed wiring boards 13 and 33 of the operation unit housing 10 and the display unit housing 30 and transmits the light to the other.

The display unit side tubular unit 40 may be attached to the operation unit housing 10 using the spacer 50 and the rod-like hinge unit 60 as in the first embodiment, or the second embodiment. Similarly, you may attach using the annular hinge unit 70. FIG. Alternatively, as shown in FIG. 7, the spacer 50 and the rod-like hinge unit 60 may be used and the annular hinge unit 70 may be used for attachment.

  Thus, in the present embodiment, the display unit casing 30 is rotated with respect to the display unit side cylindrical unit 40 in a direction perpendicular to the rotation direction of the display unit side cylindrical unit 40 with respect to the operation unit side cylindrical unit 20. By freely assembling, the display unit housing 30 can be rotated about two axes with respect to the operation unit housing 10.

Instead of the annular hinge units 70 and 77 having through holes, a hinge unit having a light transmitting part that transmits light at the center may be used. Moreover, the inside of the inner cylinder part 41 and the 2nd inner cylinder part 44 does not necessarily need to be a space | gap, if it is the material which permeate | transmits light.

  In the above embodiment, the wireless communication device including the operation unit housing 10 and the display unit housing 30 has been described. However, the present invention is not limited to this, and two or more other devices that transmit information to each other. Needless to say, the present invention can be applied to an apparatus that opens and closes by rotating the members, and can be applied to, for example, a digital still camera, a digital video camera, a PDA, a notebook computer, and the like.

1 is an overall view showing a wireless communication apparatus to which the present invention is applied. It is principal part sectional drawing which shows 1st Embodiment of the hinge structure of this invention. It is the schematic explaining the assembly method of the hinge structure of FIG. It is principal part sectional drawing which shows 2nd Embodiment of the hinge structure of this invention. It is aa sectional drawing of FIG. It is principal part sectional drawing which shows 2nd Embodiment of the hinge structure of this invention. It is principal part sectional drawing which shows 3rd Embodiment of the hinge structure of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Operation part housing | casing 12 Operation part side bearing 20 Operation part side cylindrical part 21 Outer cylinder part 30 Display part housing | casing 32 Display part side bearing
37 2nd outer cylinder part 40 Display part side cylindrical part 41 Inner cylinder part 43 , 46 Water stop material 44 2nd inner cylinder part 48 Mirror 50 Spacer 60 Columnar hinge unit 61 Operation part side fixing part 62 Display part side fixing part 70 , 77 annular hinge unit 71 first fixed ring 72 second fixed ring 75 third fixed ring 76 fourth fixed ring 81 first optical transmitting / receiving element 82 second optical transmitting / receiving element 83 third optical transmitting / receiving element

Claims (7)

A hinge structure that foldably connects the first housing and the second housing,
A first bearing having a through hole whose central axis coincides with the folding axis is provided at one end of the first casing on the connecting portion side with the second casing, and the central axis is the folding axis at the other end. And a first cylindrical portion having an opening communicating with the inside of the first housing at the axial end facing the first bearing is provided,
The second housing has a second bearing with a hole formed in the axial end facing the first bearing at a connecting portion side of the second housing with the first housing. A second cylindrical portion having an opening communicating with the inside of the second housing at an axial end facing the one cylindrical portion;
The first cylindrical portion and the second cylindrical portion are arranged such that an end portion on the opening side of the second cylindrical portion is inserted into an end portion on the opening portion side of the first cylindrical portion, so that they are in the circumferential direction. Between the inner and outer peripheral surfaces of the assembly part of the first cylindrical part and the second cylindrical part are closed by a water stop material ,
In the first bearing and the second bearing, a columnar hinge unit in which a distal end side member and a proximal end side member are assembled so as to be freely rotatable in the circumferential direction is provided from the first bearing side to the second bearing. is inserted on the side, rotatably connected to said <br/> that has a to Ruhi Nji structure. Both ends are connected to the printed wiring board provided in the first casing and the second casing through the opening of the first cylindrical section and the opening of the second cylindrical section. hinge structure according to claim 1, characterized in that it comprises a flexible printed circuit board that. A first optical transmission / reception element connected to a printed wiring board provided in the first casing; and a second optical transmission / reception element connected to a printed wiring board provided in the second casing. The first optical transmitter / receiver device and the second optical transmitter / receiver device transmit information to each other through light through the opening of the first cylindrical portion and the opening of the second cylindrical portion. hinge structure according to 1. A gap between the first bearing and the second bearing generated in a state where the second cylindrical portion is assembled to the first cylindrical portion has an annular shape having a hole into which the columnar hinge unit is inserted at the center. member is disposed, the columnar hinge unit, one from the first bearing side in a state where the annular member is disposed in claims 1 to 3, characterized in that it is inserted into the second bearing side hinge structure according to one paragraph or. The second cylindrical portion is a member that is assembled to the second casing so as to be rotatable about an axis orthogonal to the folding axis, and is a third cylinder that protrudes toward the second casing. And the third cylindrical part is inserted into a fourth cylindrical part provided in the second housing and is assembled to the fourth cylindrical part so as to be rotatable in the circumferential direction. together have any one of claim 1 to 4, characterized in that between the inner peripheral surface of the assembly portion of the said fourth cylindrical portion and the third cylindrical portion is closed by the water stopping material hinge structure according to. A first annular member of an annular hinge unit in which a first annular member and a second annular member are rotatably assembled to each other in the circumferential direction is connected to the tip of the third cylindrical portion, and the annular hinge hinge structure according to claim 5 in which the second annular member units, characterized in that it is connected to the fourth cylindrical portion. A first optical transmission / reception element provided in the first casing and a second optical transmission / reception element provided in the two casings; and provided in the second cylindrical portion ; claim, characterized in that it comprises a first light receiving element or the second light light emitted from the transmitting and receiving element is reflected at a right angle to transmit the second light emitting and receiving elements or the first light emitting and receiving elements a mirror 5 or hinge structure according to 6.

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