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A hinge system of a portable wireless terminal not only enables a folder to be opened from a terminal body but also enables front and rear surfaces of a folder of a portable wireless terminal to be turned over. The hinge system a folder-opening hinge module and a rotary-type hinge module, the cooper

A hinge system of a portable wireless terminal not only enables a folder to be opened from a terminal body but also enables front and rear surfaces of a folder of a portable wireless terminal to be turned over. The hinge system a folder-opening hinge module and a rotary-type hinge module, the cooperation of which realizes the above operation. The rotary-type hinge module includes a hinge housing rotatably assembled with the terminal body, a supporting shaft fixed to the hinge housing, and a rotary shaft rotatably assembled with the supporting shaft. The rotary shaft is connected with the folder and can be rotated with respect to the terminal body, thereby enabling the folder to be turned over in a state that the folder is opened.

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What is claimed is: 1. A rotary-type hinge module of a portable wireless terminal, which is disposed between a terminal body and a folder of the portable wireless terminal, the hinge module having a first rotation axis and a second rotation axis perpendicular to each other, the hinge module enablin

What is claimed is: 1. A rotary-type hinge module of a portable wireless terminal, which is disposed between a terminal body and a folder of the portable wireless terminal, the hinge module having a first rotation axis and a second rotation axis perpendicular to each other, the hinge module enabling the folder to rotate about the second rotation axis after the folder is opened from the terminal body, the hinge module comprising: a hinge housing assembled with the terminal body while being rotatable about the first rotation axis, the hinge housing having a fixing seat and an opening, the fixing seat being formed at a portion of an inner surface thereof, the opening formed through an opposed portion to the fixing seat, the fixing seat being exposed through the opening in the direction of the second rotation axis; a supporting shaft fixed to the fixing seat of the hinge housing and extending through the opening of the hinge housing; a hinge cam fixed to the supporting shaft and having at least one valley-shaped portion formed at one side thereof; a hinge shaft having a mountain-shaped portion formed at one side thereof, a hinge shaft hole passing axially there through, and at least one guide protuberance formed on a circumferential surface of the hinge shaft, the supporting shaft being inserted through the hinge shaft hole; an elastic means forcing the hinge shaft toward the hinge cam so that the mountain-shaped portion and the valley-shaped portion are in sliding contact with each other; and a rotary shaft having a shape of a cylinder which has an open end and a closed end opposite to each other, the rotary shaft containing the hinge cam, the hinge shaft, and the elastic means, the rotary shaft having at least one guide hole with which the guide protuberance of the hinge shaft is engaged, the rotary shaft having an assembling means to which one end of the folder is fixed. 2. A rotary-type hinge module of a portable wireless terminal as claimed in claim 1, wherein: the fixing seat is formed by a concave recess in said portion of the inner surface of the hinge housing; the hinge housing further has a fixing hole formed through a central portion of the fixing seat, the fixing hole extending from the interior to the exterior of the hinge housing; and the supporting shaft is fixed to the fixing seat of the hinge housing by a screw screwed through the fixing hole from the exterior of the hinge housing. 3. A rotary-type hinge module of a portable wireless terminal as claimed in claim 2, wherein the supporting shaft comprises: a fixed head formed at a lower end of the supporting shaft, the fixed head having a shape corresponding to that of the fixing seat; and a stepped portion having an angular shape and being formed circumferentially around and radially outward from the supporting shaft, the stepped portion extending a predetermined length from the fixed head in an axial direction along the supporting shaft, wherein the hinge cam has a hinge cam hole having a shape corresponding to the angular shape of the stepped portion of the supporting shaft, so that the hinge cam hole securely interfaces with the stepped portion, thereby fixedly assembling the hinge cam with the supporting shaft. 4. A rotary-type hinge module of a portable wireless terminal as claimed in claim 1, wherein the hinge shaft linearly reciprocates in the rotary shaft. 5. A rotary-type hinge module of a portable wireless terminal as claimed in claim 1, wherein: the supporting shaft has an annular groove formed circumferentially on an outer cylindrical surface of an upper end of the supporting shaft; the rotary shaft has a shaft hole formed through the closed end thereof, the annular groove being exposed out of the shaft hole when the supporting shaft is inserted through the shaft hole and the upper end of the supporting shaft protrudes through the shaft hole; and an E-ring interfaces around the annular groove exposed out of the shaft hole, so that the rotary shaft is assembled with the supporting shaft. 6. A rotary-type hinge module of a portable wireless terminal as claimed in claim 5, further comprising a washer fitted between the E-ring and the closed end of the rotary shaft. 7. A rotary-type hinge module of a portable wireless terminal as claimed in claim 1, wherein the assembling means of the rotary shaft comprises at least one rib extending laterally outward from a cylindrical outer surface of the closed end of the rotary shaft, the rib having an assembling hole formed therethrough. 8. A rotary-type hinge module of a portable wireless terminal as claimed in claim 1, wherein the assembling means of the rotary shaft comprises assembling wings extending laterally outward from opposite side surfaces of the closed end of the rotary shaft, and ribs extending in a longitudinal direction along the rotary shaft from end portions of the assembling wings, the assembling wings extending a length longer than that of the hinge housing, each of the ribs having an assembling hole. 9. A rotary-type hinge module of a portable wireless terminal as claimed in claim 8, wherein the assembling means further comprises a stopper protruding from a surface of the assembling wings, and the hinge housing has a sliding groove corresponding to a rotation trace of the stopper and formed on an outer surface thereof, so that the stopper is guided along the sliding groove, thereby enabling a range within which the stopper can be rotated to be limited to 180째. 10. A rotary-type hinge module of a portable wireless terminal as claimed in claim 1, wherein the rotary shaft has a predetermined flat surface formed at one side of the closed end thereof. 11. A rotary-type hinge module of a portable wireless terminal as claimed in claim 1, wherein: the rotary shaft comprises a rotation protuberance longitudinally extending a predetermined length from the open end of the rotary shaft; and the hinge housing has a sliding surface comprising a recess formed around the fixing seat and along a trace corresponding to a rotating trace of the rotation protuberance, the sliding surface receiving and engaging the rotation protuberance, thereby defining rotational limitation of the rotation of the rotary shaft. 12. A rotary-type hinge module of a portable wireless terminal as claimed in claim 11, wherein the sliding surface limits the rotating trace of the rotation protuberance, thereby enabling a range within which the rotary shaft can be rotated to be limited to 180째. 13. A rotary-type hinge module of a portable wireless terminal as claimed in claim 1, wherein the hinge housing further comprises: a holding pin hole formed through one end thereof and a hinge shaft hole formed through the other end thereof in a direction of the first rotation axis. 14. A rotary-type hinge module of a portable wireless terminal as claimed in claim 1, wherein: the valley-shaped portion of the hinge cam and the mountain-shaped portion of the hinge shaft each have a curved surface opposed to each other. 15. A rotary-type hinge module of a portable wireless terminal as claimed in claim 1, wherein: the elastic means is supported by the closed end of the rotary shaft. 16. A rotary-type hinge module of a portable wireless terminal, for rotatably assembling a terminal body and a folder of the portable wireless terminal with each other, the hinge module comprising: a hinge housing rotatably assembled with the terminal body; a supporting shaft formed integrally with and extending outward from a portion of an inner surface of the hinge housing in a direction opposed to said portion; a first slip washer having a first washer hole formed longitudinally through a central portion thereof, by which the first slip washer is fixedly assembled with the supporting shaft; a second slip washer having a first washer hole formed longitudinally through a central portion thereof, by which the second slip washer is rotatably fitted around the supporting shaft while being in surface contact with the first slip washer; an elastic means assembled with the supporting shaft and supporting the second slip washer, so that the elastic means provides elastic force in a direction which forces the first and second slip washers to be in tighter contact with each other; and a rotary shaft having a shape of a cylinder which has an open end and a closed end opposite to each other, the rotary shaft containing the first and second slip washers and the elastic means, which are assembled with the supporting shaft, the rotary shaft being assembled with the supporting shaft in such a manner that the rotary shaft can be rotated together with the second slip washer, thereby rotating the folder. 17. A rotary-type hinge module of a portable wireless terminal as claimed in claim 16, wherein: the supporting shaft comprises a stepped portion having an angular shape and being formed circumferentially around and radially outward from the supporting shaft, the stepped portion extending a predetermined length from said portion of the inner surface of the hinge housing; and the first slip washer has a first washer hole having a shape corresponding to the angular shape of the stepped portion, so that the first slip washer snugly fits around the stepped portion, thereby being fixedly assembled with the supporting shaft. 18. A rotary-type hinge module of a portable wireless terminal as claimed in claim 16, wherein the first slip washer has at least one washer groove formed on an outer circumferential surface thereof, and the second slip washer has at least one guide protuberance corresponding to the washer groove, so that the guide protuberance and the washer groove engage each other, thereby performing a latch function, thereby requiring a threshold rotational force to be applied when the second slip washer is rotated. 19. A rotary-type hinge module of a portable wireless terminal as claimed in claim 16, wherein: the second slip washer has at least one guide protuberance formed on an outer circumferential surface thereof, and the rotary shaft has at least one guide hole corresponding to the guide protuberance; and the guide hole extending longitudinally from the open end of the rotary shaft and radially through a sidewall of the rotary shaft, wherein the second slip washer can linearly reciprocate in the rotary shaft. 20. A rotary-type hinge module of a portable wireless terminal as claimed in claim 16, wherein: the supporting shaft has an annular groove formed circumferentially on an outer cylindrical surface of the an upper end of the supporting shaft; the rotary shaft has a shaft hole formed through the closed end thereof, the annular groove being exposed out of the shaft hole when the supporting shaft is inserted through the shaft hole and the upper end of the supporting shaft comes out of the shaft hole; and an E-ring is fitted around the annular groove exposed out of the shaft hole, so that the rotary shaft is assembled with the supporting shaft. 21. A rotary-type hinge module of a portable wireless terminal as claimed in claim 20, further comprising a washer fitted between the E-ring and the closed end of the rotary shaft. 22. A rotary-type hinge module of a portable wireless terminal as claimed in claim 16, wherein the rotary shaft comprises at least one rib extending laterally outward from a cylindrical outer surface of the closed end of the rotary shaft, the rib having an assembling hole formed therethrough. 23. A rotary-type hinge module of a portable wireless terminal, for rotatably assembling a terminal body and a folder of the portable wireless terminal with each other, the hinge module comprising: a hinge housing rotatably assembled with the terminal body; a supporting shaft fixed to and extending outward from a portion of an inner surface of the hinge housing in a direction opposed to said portion; a leaf spring having a leaf spring hole formed through a central portion thereof, through which the supporting shaft is fitly inserted, so that the leaf spring is fixedly assembled with the supporting shaft; a first washer fitted around the supporting shaft so that friction is generated between the first washer and the leaf spring when the leaf spring is rotated; a coil spring assembled with the supporting shaft and supporting the first washer, so that the coil spring provides elastic force in a direction which forces the first washer and the leaf spring in tighter contact with each other; and a rotary shaft having a shape of a cylinder which has an open end and a closed end opposite to each other, the rotary shaft containing the leaf spring, the first washer, and the coil spring, which are assembled with the supporting shaft, the coil spring being supported by the closed end of the rotary shaft, the rotary shaft being assembled with the supporting shaft in such a manner that the rotary shaft can rotate the folder. 24. A rotary-type hinge module of a portable wireless terminal as claimed in claim 23, further comprising a second washer fitted between the coil spring and the closed end of the rotary shaft. 25. A rotary-type hinge system of a portable wireless terminal, for rotatably assembling a terminal body and a folder of the portable wireless terminal with each other, the hinge system comprising: a folder-opening hinge module providing a first rotation axis about which the folder can be rotated when the folder is opened or closed with respect to the terminal body; and a rotary-type hinge module having a hinge housing rotatably assembled with the terminal body by the folder-opening hinge module in such a manner that the hinge housing can be rotated about the first rotation axis, a supporting shaft fixed to and extending outward from a portion of an inner surface of the hinge housing in a direction opposed to said portion, and a rotary shaft having a shape of a cylinder which has an open end and a closed end opposite to each other; wherein the rotary shaft is assembled with the supporting shaft in such a manner that the rotary shaft can be rotated so as to form a second rotation axis perpendicular to the first rotation axis and is assembled with the folder thereby enabling the folder to be rotated about the second rotation axis in a state where the folder is opened from the terminal body while being assembled with the terminal body. 26. A rotary-type hinge system of a portable wireless terminal as claimed in claim 25, wherein the folder-opening hinge module comprises: a module housing received in the terminal body, the module housing having a receiving space one side of which is opened, the module housing having guide grooves formed on inner side surfaces thereof and a first hinge shaft hole formed through one end thereof; a first hinge cam having guide protuberances formed on side surfaces thereof and corresponding to the guide grooves of the module housing, so that the first hinge cam linearly moves in the module housing, the first hinge cam having a valley-shaped portion formed at one end thereof; a first hinge shaft including a mountain-shaped portion formed at one end thereof, which corresponds to the valley-shaped portion of the first hinge cam, and a shaft portion formed at the other end thereof and protruding out of the module housing through the first hinge shaft hole of the module housing; and an elastic means disposed and supported between the other end of the module housing and the other end of the first hinge cam, thereby applying elastic force to the first hinge cam in a direction of forcing the first hinge cam and the first hinge shaft to be in tighter contact with each other, wherein the shaft portion of the first hinge shaft is assembled with the rotary-type hinge module, so that the rotary-type hinge module and the first hinge shaft are rotated together when the folder is opened or closed. 27. A rotary-type hinge system of a portable wireless terminal as claimed in claim 25, wherein the folder-opening hinge module comprises: a module housing received in the terminal body, the module housing having a receiving space one side of which is opened, the module housing having guide grooves formed on inner side surfaces thereof and a first hinge shaft hole formed through one end thereof; a first hinge cam having guide protuberances formed on side surfaces thereof and corresponding to the guide grooves of the module housing, so that the first hinge cam linearly moves in the module housing, the first hinge cam having a valley-shaped portion formed at one end thereof; a first hinge shaft including a mountain-shaped portion formed at one end thereof, which corresponds to the valley-shaped portion of the first hinge cam, and a shaft portion formed at the other end thereof and protruding out of the module housing through the first hinge shaft hole of the module housing; and an elastic means disposed and supported between the other end of the module housing and the other end of the first hinge cam, thereby applying elastic force to the first hinge cam in a direction of forcing the first hinge cam and the first hinge shaft to be in tighter contact with each other, wherein the shaft portion of the first hinge shaft is fixed to the terminal body, so that the first hinge shaft is rotated with respect to the folder when the folder is opened or closed. 28. A rotary-type hinge system of a portable wireless terminal as claimed in claim 25, wherein the rotary-type hinge module further comprises: a hinge cam having a valley-shaped portion formed in a diametric direction at one side thereof, the hinge cam having a hinge cam hole formed therethrough, by which the hinge cam is fixedly assembled with the supporting shaft; a hinge shaft having a mountain-shaped portion formed in a diametric direction at one side thereof and corresponding to the valley-shaped portion of the hinge cam, the hinge shaft having a hinge shaft hole formed therethrough, by which the hinge shaft is rotatably assembled with the supporting shaft; and an elastic means assembled with the supporting shaft and supporting the hinge shaft, thereby providing elastic force in a direction which forces the mountain-shaped portion of the hinge shaft and the valley-shaped portion of the hinge cam to be in tighter contact with each other; wherein the hinge cam, the hinge shaft, and the elastic means are contained in the rotary shaft and are assembled with the supporting shaft, the elastic means being supported by the closed end of the rotary shaft. 29. A rotary-type hinge system of a portable wireless terminal as claimed in claim 28, wherein: the rotary shaft provides an assembling means with which the folder is assembled, the assembling means comprising assembling wings extending laterally outward from opposite side surfaces of the closed end of the rotary shaft, and ribs extending in a longitudinal direction along the rotary shaft from end portions of the assembling wings, the assembling wings extending a length longer than that of the hinge housing, each of the ribs having an assembling hole; and the folder further comprises a frame received therein, which has assembling holes corresponding to the assembling holes of the ribs, which enable the frame to be fixed to the rotary shaft. 30. A rotary-type hinge module of a portable wireless terminal as claimed in claim 29. wherein the assembling means further comprises a stopper protruding from a surface of the assembling wings, and the hinge housing having a sliding groove corresponding to a rotation trace of the stopper and formed on an outer surface thereof, so that the stopper is guided along the sliding groove, thereby enabling a range within which the stopper can be rotated to be limited to 180째. 31. A rotary-type hinge system of a portable wireless terminal as claimed in claim 28, wherein the hinge housing further has a receiving hole for receiving the folder-opening hinge module formed at one end thereof. 32. A rotary-type hinge module of a portable wireless terminal, which is disposed between a terminal body and a folder of the portable wireless terminal, the hinge module having a first rotation axis and a second rotation axis perpendicular to each other, the hinge module enabling the folder to rotate about the second rotation axis after the folder is opened from the terminal body, the hinge module comprising: a hinge housing assembled with the terminal body while being rotatable about the first rotation axis, the hinge housing having a holding pin hole formed through one end thereof and a hinge shaft hole formed through the other end thereof in a direction of the first rotation axis, the hinge housing having a fixing seat and an opening, the fixing seat being formed at a portion of an inner surface thereof in a direction of the second rotation axis, the opening formed through an opposed portion to the fixing seat, the fixing seat being exposed through the opening in the direction of the second rotation axis; a supporting shaft fixed to the fixing seat of the hinge housing and extending through the opening of the hinge housing; a hinge cam fixed to the supporting shaft and having at least one valley-shaped portion formed at one side thereof, the valley-shaped portion having a curved surface; a hinge shaft having a mountain-shaped portion formed at one side thereof and a hinge shaft hole passing axially therethrough, the mountain-shaped portion having a curved surface, the supporting shaft being inserted through the hinge shaft hole so that the hinge shaft is fitted around the supporting shaft in such a manner that the curved surface of the mountain-shaped portion is opposed to the curved surface of the at least one valley-shaped portion, the hinge shaft having at least one guide protuberance formed on a circumferential surface of the hinge shaft; an elastic means forcing the hinge shaft toward the hinge cam so that the curved surfaces of the mountain-shaped portion and the valley-shaped portion are in sliding contact with each other; and a rotary shaft having a shape of a cylinder which has an open end and a closed end opposite to each other, the rotary shaft containing the hinge cam, the hinge shaft, and the elastic means, the elastic means being supported by the closed end of the rotary shaft, the rotary shaft having at least one guide hole with which the at least one guide protuberance of the hinge shaft is engaged, the rotary shaft having an assembling means to which one end of the folder is fixed.