Abstract:
The present invention provides a portable device which can easily (by one action) bring the display device into a use state from a stored state when a display device is used in a vertical orientation or the display device is used in a horizontal orientation, and can make an exclusive operation part usable in each use state, can hide an unnecessary operation part to enhance operability, or can show an exclusive appearance on a surface.

Description:
BACKGROUND OF THE INVENTION 
       [0001]    1. Field of the Invention 
         [0002]    The present invention relates to portable device such as a cellular phone, and particularly to portable device including a slide mechanism. 
         [0003]    2. Description of the Related Art 
         [0004]    As portable device, a folding type of portable device in which two enclosures that are an enclosure having a display device and an enclosure having an operation part are linked to be openable and closable via a hinge, and a slide type of portable device in which two enclosures are linked to be openable and closable via a slide mechanism are known. Such portable device can be brought into a compact stored state convenient to carry by overlaying the enclosure having a display device and the enclosure having an operation part on each other. 
         [0005]    In such storable portable device, there is the one equipped with a television receiving function. Generally, a display device of storable portable device is in a vertically-oriented shape, but there may be a case in which the display device is desired to be horizontally-oriented to enhance visibility for information displayed in a horizontal orientation such as a television image. 
         [0006]    In order to solve this, Japanese Patent Application Laid-Open No. 2001-156893 proposes communication device in which a display unit portion is made rotatable, display can be made vertically-oriented or horizontally-oriented with respect to an operation part enclosure, and the display of the display part is switched to be vertically-oriented and horizontally-oriented with the rotation of the display unit portion. 
         [0007]    Japanese Patent Application Laid-Open No. 2005-38217 proposes portable device in which a main body part and a flip part are deformable in various forms by jointing the main body part and the flip part to each other to be rotatable by using a hinge having three axes of rotation. 
         [0008]    In such storable portable device, only one kind of operation part is generally used, but it is sometimes efficient to use another operation part in accordance with the functions to be used such as a call function and a television function. 
         [0009]    In order to solve this, Japanese Patent Application Laid-Open No. 2002-330198 proposes a cellular phone in which different operation parts appear in correspondence with opening and closing a flip. 
       SUMMARY OF THE INVENTION 
       [0010]    However, the portable device disclosed in the above described Patent Documents has the following disadvantage. Specifically, the communication device disclosed in Japanese Patent Application Laid-Open No. 2001-156893 has the problem that a plurality of operations are required and the operations are complicated when the device is switched into a state in which the display device is used in a horizontal orientation from a state in which it is stored with two enclosures folded. 
         [0011]    The portable device disclosed in Japanese Patent Application Laid-Open No. 2005-38217 has the problem of having necessity of using an expensive and complicated mechanism called a hinge having a plurality of axes, and also has the problem that when the display device is made horizontally-oriented, the operation portion and the letters on the enclosure are also horizontally-oriented at the same time when the display device is horizontally oriented, and therefore, it becomes difficult to operate. It also has the problem of confusion since the appearance is the same. 
         [0012]    The cellular phone disclosed in Japanese Patent Application Laid-Open No. 2002-330198 has the problem that a display device cannot be provided at an entire enclosure, and the display device becomes small. 
         [0013]    The present invention is made in view of the above circumstances, and has its object to provide portable device which can easily (by one action) bring the display device into a use state from a stored state when a display device is used in a vertical orientation or the display device is used in a horizontal orientation, and can make an exclusive operation part usable in each use state, can hide an unnecessary operation part to enhance operability, or can show an exclusive appearance on a surface. 
         [0014]    In order to attain the above-described object, portable device according to the present invention includes a first enclosure including a first operation part, a second enclosure including a display part, a third enclosure, and a joint mechanism which joints the first enclosure, the second enclosure and the third enclosure respectively, and joints the second enclosure movably with respect to the first enclosure from a first position in which a silhouette of the second enclosure is overlaid on the first enclosure to a second position and a third position differing from each other, wherein in the first position, the joint mechanism integrally joints the second enclosure so as to be overlaid on silhouettes of the first enclosure and the third enclosure, when the second enclosure moves to the second position from the first position, the joint mechanism causes the third enclosure to be exposed by restricting a moving amount of the third enclosure accompanying the movement of the second enclosure to zero or to be smaller than a moving amount of the second enclosure, and when the second enclosure moves to the third position from the first position, the joint mechanism causes the first operation part to be exposed in an operable state by restricting the moving amount of the third enclosure accompanying the movement of the second enclosure to be the same as that of the second enclosure or to be smaller than the moving amount of the second enclosure. 
         [0015]    As a result, by hiding an unnecessary operation part in each use state, operability is enhanced and the exclusive appearance can be shown on the surface. 
         [0016]    In order to attain the above described object, a portable device according to the present invention includes a first enclosure including a first operation part, a second enclosure including a display part, a third enclosure including a second operation part, and a joint mechanism which joints the first enclosure, the second enclosure and the third enclosure respectively, and joints the second enclosure movably with respect to the first enclosure from a first position in which a silhouette of the second enclosure is overlaid on the first enclosure to a second position and a third position differing from each other, wherein in the first position, the joint mechanism integrally joints the second enclosure so as to be overlaid on silhouettes of the first enclosure and the third enclosure, when the second enclosure moves to the second position from the first position, the joint mechanism causes the second operation part to be exposed in an operable state by restricting a moving amount of the third enclosure accompanying the movement of the second enclosure to zero or to be smaller than a moving amount of the second enclosure, and when the second enclosure moves to the third position from the first position, the joint mechanism causes the first operation part to be exposed in an operable state by restricting the moving amount of the third enclosure accompanying the movement of the second enclosure to be the same as that of the second enclosure or to be smaller than the moving amount of the second enclosure. 
         [0017]    As a result, only the necessary operation parts are exposed in the first position, the second position and the third position, and therefore, operability can be enhanced. 
         [0018]    The joint mechanism (link mechanism) may be constituted so that when the second enclosure moves to the second position from the first position with respect to the first enclosure, the second enclosure may move parallel in a first direction, and when the second enclosure moves to the third position from the first position with respect to the first enclosure, the second enclosure may move parallel in a second direction differing from the first direction. 
         [0019]    As a result, the second enclosure can be easily moved to the second position from the first position and to the third position from the first position. 
         [0020]    The joint mechanism may use a parallel-linking mechanism as a mechanism for the second enclosure to perform parallel movement in one direction of the parallel movement in two directions that are the first direction and the second direction. 
         [0021]    As a result, parallel movement can be realized with a simple and reliable mechanism. 
         [0022]    The joint mechanism (link mechanism) may be constituted so that when the second enclosure moves to the second position from the first position with respect to the first enclosure, the second enclosure may perform parallel movement, and when the second enclosure moves to the third position from the first position with respect to the first enclosure, the second enclosure may perform rotational movement. 
         [0023]    At this time, it is preferable to further include a restriction mechanism restricting movement of the second enclosure, and the restriction mechanism preferably restrict the motion of the second enclosure so as to allow parallel movement and rotational movement of the second enclosure in the first position, allow only the parallel movement of the second enclosure in the second position, and allow only the rotational movement of the second enclosure in the third position. 
         [0024]    As a result, movement of the second enclosure is restricted so as not be able to perform unnecessary motion, and therefore, the second enclosure can be moved more easily to the second position from the first position and to the third position from the first position. 
         [0025]    The joint mechanism (link mechanism) may be constituted so that when the second enclosure moves to the second position from the first position with respect to the first enclosure, the second enclosure performs rotational movement, and when the second enclosure moves to the third position from the first position with respect to the first enclosure, the second enclosure performs parallel movement. 
         [0026]    At this time, it is preferable to include a restriction mechanism restricting movement of the second enclosure, and the restriction mechanism preferably restrict motion of the second enclosure so as to allow parallel movement and rotational movement of the second enclosure in the first position, allow only rotational movement of the second enclosure in the second position, and allow only parallel movement of the second enclosure in the third position. 
         [0027]    Thereby, movement of the second enclosure is restricted so as not to be able to perform unnecessary motion, and therefore, the second enclosure can be moved more easily to the second position from the first position and to the third position from the first position. 
         [0028]    A stop mechanism stopping the second enclosure with predetermined holding forces respectively in the first position, the second position and the third position may be included. 
         [0029]    As a result, the second enclosure is stopped at each position, and therefore, an operation at each position is facilitated. 
         [0030]    In order to attain the above described object, a portable device according to the present invention includes a first enclosure including a first operation part, a second enclosure including a display part, a third enclosure, and a joint mechanism which joints the first enclosure, the second enclosure and the third enclosure respectively, and joints the second enclosure movably with respect to the first enclosure from a first position in which a silhouette of the second enclosure is overlaid on the first enclosure to a second position and a third position differing from each other, wherein in the first position, the joint mechanism integrally joints the second enclosure so as to be overlaid on silhouettes of the first enclosure and the third enclosure, when the second enclosure moves to the second position from the first position, the joint mechanism causes the third enclosure to be exposed by restricting a moving amount of the third enclosure accompanying the movement of the second enclosure to zero or to be smaller than a moving amount of the second enclosure, and when the second enclosure moves to the third position from the first position, the joint mechanism causes the first operation part to be exposed in an operable state by restricting the moving amount of the third enclosure accompanying the movement of the second enclosure to be the same as the second enclosure or to be smaller than the moving amount of the second enclosure, and the portable device further includes a position detecting device capable of detecting which position of the first position, the second position and the third position the portable device is in, and a mode selecting device selecting a usable operation mode from a plurality of operation modes, and the mode selecting device automatically selects a usable operation mode from the plurality of operation modes based on a detection result of the position detecting device. 
         [0031]    As a result, the portable device in which the operation mode in each position is automatically selected, and a user does not have to perform a complicated operation can be provided. 
         [0032]    The display part may be provided in the second enclosure so that its longitudinal direction corresponds to a longitudinal direction of the second enclosure, one of the plurality of operation modes may be a television viewing and listening mode, a moving image reproduction mode or a game mode, and when a screen of the display part is held to be seen in a horizontal orientation, the first operation part exposed below the screen may be made a television operation part, a moving image reproduction operation part or a game operation part. 
         [0033]    As a result, television viewing and listening, moving image reproduction or a game which is suitable for a horizontal orientation can be performed with the display horizontally-oriented, and an operation can be performed in a lower portion of the display. 
         [0034]    A camera device which takes an image of a subject, and an image-taking lens used in the camera device exposed from a back of the second enclosure only when the second enclosure is moved parallel in a longitudinal direction may be included, and the mode selecting device may make it possible to select a camera mode actuating the camera device only when the second enclosure is in the second position to which the second enclosure is moved parallel in the longitudinal direction. 
         [0035]    As a result, the lens is exposed in the second position, and image-taking by a camera device can be performed. The image-taking lens is not exposed in the first position and the third position, and the image-taking lens can be protected from damage and contamination. 
         [0036]    A telephone device may be included, when the second enclosure is in the first position, the mode selecting device may select a waiting mode waiting for arrival of a telephone call from the plurality of operation modes, and only when the second enclosure is in the second position to which the second enclosure is moved parallel in the longitudinal direction, the mode selecting device may make it possible to select a call mode allowing a call by the telephone function. 
         [0037]    As a result, the telephone function with favorable usability can be realized. 
         [0038]    According to the present invention, the operation member suitable for the mode using the display of the portable device in the vertical orientation is exposed when the display of the portable device is used in the vertical orientation, and the operation member suitable for the mode using the display in the horizontal orientation is exposed when the display is used in the horizontal orientation, whereby the portable device easy for a user to operate can be provided. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0039]      FIGS. 1A to 1C  are perspective views of portable device  1  of a first embodiment according to the present invention seen from a front; 
           [0040]      FIGS. 2A to 2C  are perspective views of the portable device  1  seen from a rear side; 
           [0041]      FIG. 3  is a system block diagram of the portable device  1 ; 
           [0042]      FIG. 4  is an exploded perspective view of the portable device  1 ; 
           [0043]      FIGS. 5A to 5D  are views of the respective enclosures of the portable device  1  seen from a top side; 
           [0044]      FIGS. 6A to 6C  are views of the transition of slide movement of the portable device  1  to the second position from the first position seen from the top side; 
           [0045]      FIGS. 7A to 7C  are sectional views in the lines a to a′ of  FIGS. 6A to 6C ; 
           [0046]      FIGS. 8A to 8C  are views of the transition of rotational movement of the portable device  1  to the third position from the first position seen from the top side; 
           [0047]      FIGS. 9A to 9C  are sectional views in the lines b to b′ of  FIGS. 8A to 8C ; 
           [0048]      FIG. 10  is a table showing states of ON and OFF of the first detection switch  16  and the second detection switch  34  in each of the positions; 
           [0049]      FIG. 11  is a flowchart showing an operation state of the portable device  1 ; 
           [0050]      FIG. 12  is an exploded perspective view of a third enclosure  30 ; 
           [0051]      FIG. 13  is an exploded perspective view of the third enclosure  30 ; 
           [0052]      FIG. 14  is a sectional view of a second operation part  31  and a first operation part  11 ; 
           [0053]      FIGS. 15A to 15C  are perspective views of the portable device  1  of a second embodiment of the present invention seen from a front; 
           [0054]      FIGS. 16A to 16C  are perspective views of the portable device  1  seen from a rear side; 
           [0055]      FIG. 17  is an exploded perspective view of the portable device  1 ; 
           [0056]      FIGS. 18A to 18C  are views of the respective enclosures seen from top portions; 
           [0057]      FIGS. 19A to 19C  are views of transition of the vertical slide movement to the second position from the first position seen from the top side; 
           [0058]      FIGS. 20A to 20C  are views of the transition of the horizontal slide movement of the portable device  1  to the third position from the first position seen from the top side; 
           [0059]      FIGS. 21A and 21B  are perspective views of the portable device  1  seen from the front; 
           [0060]      FIG. 22  is a view showing the third position of the portable device  1  of a third embodiment according to the present invention; and 
           [0061]      FIG. 23  is a view of the third position of the portable device  1  of the third embodiment according to the present invention. 
       
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
       [0062]    Hereinafter, preferred embodiments of portable device according to the present invention will be described with reference to the attached drawings. 
       First Embodiment 
       [0063]      FIGS. 1A to 1C  are perspective views of portable device  1  of a first embodiment according to the present invention seen from a front.  FIG. 1A  shows a first position that is a stored state,  FIG. 1B  shows a second position that is a state in which a display device is used in a vertical orientation.  FIG. 1C  shows a third position that is a state in which the display device is used in a horizontal orientation.  FIGS. 2A to 2C  are perspective views of the portable device  1  seen from a rear.  FIG. 2A  shows a first position.  FIG. 2B  shows a second position.  FIG. 2C  shows a third position. 
         [0064]    The portable device  1  is portable device of which operation member is capable of being slid and stored such as a cellular phone, for example, and is constituted of a first enclosure  10 , a second enclosure  20  and a third enclosure  30 . 
         [0065]    As shown in  FIG. 1C , the first enclosure  10  is in a substantially rectangular parallelepiped shape, where a first operation part  11  constituted of a television operation button, a moving image reproduction button, a sound volume button and the like is placed. As shown in  FIG. 1A , the second enclosure  20  is also in a substantially rectangular parallelepiped shape as the first enclosure  10 , where a rectangular display  21  for displaying information such as an image, with a longitudinal direction aligned with a longitudinal direction of the enclosure, and speakers  26 R and  26 L outputting sound are placed, and an image-taking lens  27  located on a back side of the enclosure as shown in  FIG. 2B  is placed. As shown in  FIG. 1B , the third enclosure  30  is in a substantially rectangular parallelepiped shape as the first enclosure  10 , and in the third enclosure  30 , a second operation part  31  constituted of a call button, a clearing button, a ten key, a shutter button and the like, and a microphone  39  which inputs voice at the time of telephone call are placed. 
         [0066]    Next, by using  FIG. 3 , an internal configuration of the portable device  1  will be described.  FIG. 3  is a system block diagram of the portable device  1 . 
         [0067]    The first enclosure  10  includes a first detection switch  16  for detecting which position of a first position, a second position and a third position the portable device  1  is in, a telephone antenna  101 , a telephone control part  102  having a decoder, modulator and the like for transmitting and receiving a voice signal, a camera control part  103  taking an image of a subject via an image-taking lens  27 , and digital-processing the taken image data, a recording part  104  in which taken data is stored, an television antenna  105 , a television control part  106  including a tuner for receiving television, a decoder and the like, a storage part  107  including an attachable and detachable external media for storing moving image data, a moving image reproduction control part  108  including a signal processing circuit and the like for reproducing data of the moving image storage part  107 , a system control part  109  selectively controlling each of the control parts, a main board  110  mounted with ICs and electronic components of these control parts, and a battery not shown, in addition to the first control part  11  shown in  FIG. 1C . 
         [0068]    The second enclosure  20  includes a display control part  201  including a driver and the like for displaying letters and images on the display  21 , a voice output control part  202  including an amplifier or the like amplifying an output signal and controlling the speaker  26 , and a lens control part  203  for changing a focus and a diaphragm of the lens  27 , in addition to the display  21  and the speaker  26  shown in  FIG. 1A  and the image-taking lens  27  shown in  FIG. 2B , and these ICs and electronic components are connected to the main board  110  by a flexible printed board not shown. 
         [0069]    The third enclosure  30  is provided with a second detection switch  36  for detecting which position of the first position, the second position and the third position the portable device  1  is in, in addition to the second operation part  31  and the microphone  39  shown in  FIG. 1B , and these ICs and electronic components are connected to the main board  110  by a flexible printed board not shown. 
         [0070]    The portable device  1  thus configured can perform a call to an optional number, transmission and reception of an electronic mail and the like by using the second operation part  31  in the second position shown in  FIG. 1B . In the second position, the microphone  39  is exposed, and its positional relationship is such that the microphone  39  is separated at a distance convenient for a call, whereby call is possible by using the telephone function by applying the speaker  26  and the microphone  39  to an ear and a mouth respectively, and favorable operability is provided. As shown in  FIG. 2B , in the second position, the image-taking lens  27  is exposed, and by operating a shutter button of the operation part  31  with the lens pointed to a subject, whereby, image-taking is possible. On the other hand, as shown in  FIGS. 2A and 2C , the image-taking lens  27  is not exposed in the first position and the third position, and therefore, the image-taking lens can be protected when it is not used. 
         [0071]    In the third position shown in  FIG. 1C , television and various moving images can be viewed and listened to by using the first operation part  11 . In the third position, the display  21  is horizontally oriented, and an image of a horizontally oriented television broadcasting can be efficiently displayed. The first operation part  11  exposed in the third position includes an operation button exclusive for viewing and listening to television and moving images, and is convenient for use. 
         [0072]    Next, a joint mechanism (link mechanism) of the portable device  1  of the first embodiment according to the present invention will be described by using  FIG. 4 .  FIG. 4  is an exploded perspective view of the portable device  1 , where the second enclosure  20  is illustrated so that the bottom surface can be seen from the top portion by omitting the display  21  and the like. 
         [0073]    As shown in  FIG. 4 , the first enclosure  10  is provided with a key  12  in a rectangular parallelepiped shape, a first lock pin  13 , a first detection switch  16  for detecting whether the first lock pin  13  is pressed or not, and a second lock pin  15 . The third enclosure  30  is provided with a round hole  32  for rotation, a third lock pin  33 , a fourth lock pin  35 , a second detection switch  36  for detecting whether the fourth lock pin  35  is pressed or not, a third round hole  37 , and restriction plates  38  on both sides. The key  12  is rotatable inside the round hole  32  for rotation, and the hole diameter of the third round hole  37  is larger than the diameters of the first lock pin  13  and the second lock pin  15  so that the first lock pin  13  and the second lock pin  15  are fittable in it. The height of the restriction plates  38  is smaller than the thickness of the second enclosure  20 . 
         [0074]    A keyhole-shaped slit  22 , a first round hole  23 , a second round hole  24 , and a round hole  25  for a lens for disposing a lens for image-taking are provided on a bottom surface portion of the second enclosure  20 . The hole diameters of the first round hole  23  and the second round hole  24  are larger than the diameters of the third lock pin  33  and the fourth lock pin  35  so that the third lock pin  33  and the fourth lock pin  35  are fittable therein. The keyhole-shaped slit  22  is formed into a shape in which a round hole portion and a long hole portion are connected. The key  12  is rotatable inside the round hole portion, whereas the key  12  is slidable inside the long hole portion, and the width of the long hole portion is formed to be smaller than the key  12  in the long surface direction. 
         [0075]    The key  12  provided on the first enclosure  10  is fitted and fixed to a slipping-off prevention cap  17  through the round hole  32  for rotation of the third enclosure and the keyhole-shape slit  22  of the second enclosure. The diameter of the slipping-off prevention cap  17  is larger than the round hole  32  for rotation and the round hole portion of the keyhole-shaped slit  22 . Thus, the portable device  1  of the first embodiment according to the present invention has a constitution in which the first enclosure  10  and the second enclosure  20  are integrated to sandwich the third enclosure  30 . 
         [0076]    Next, the first position that is the stored state shown in  FIG. 1A  of the portable device  1  will be described by using  FIGS. 5A to 5D .  FIGS. 5A to 5D  are views of the respective enclosures of the portable device  1  seen from the top surface. 
         [0077]      FIG. 5A  shows the state of the second enclosure  20  seen from the top surface, and shows the keyhole-shaped slit  22 , the first round hole  23  and the second round hole  24  are shown by omitting the display  21  and the like as in  FIG. 4 . The round hole  25  for a lens is omitted here.  FIG. 5B  shows the state of the third enclosure  30  seen from the top surface, and shows the round hole  32  for rotation, the third lock pin  33 , the fourth lock pin  35 , the third round hole  37 , and the restriction plates  38 .  FIG. 5C  shows the state of the first enclosure  10  seen from the top surface, and shows the key  12 , the first lock pin  13  and the second lock pin  15 . The slipping-off prevention cap  17  fitted and fixed to the key  12  is omitted here. 
         [0078]      FIG. 5D  is a view of the first position that is the state in which the third enclosure  30  is overlaid on the first enclosure  10 , and the second enclosure  20  is further overlaid on the third enclosure  30 , that is, the stored state seen from the top surface. The second lock pin  15  and the third round hole  37  should be originally hidden behind the second enclosure  20  and invisible but are shown through the second enclosure  20  for convenience. 
         [0079]    When the third enclosure  30  is overlaid on the first enclosure  10 , the key  12  provided on the first enclosure penetrates through the round hole  32  for rotation provided on the third enclosure, and at the same time, the second lock pin  15  provided on the first enclosure is fitted in the third round hole  37  provided in the third enclosure. When the second enclosure  20  is further overlaid on the third enclosure  30 , the key  12  which penetrates through the round hole  32  for rotation penetrates through the round hole portion of the keyhole-shaped slit  22  provided in the second enclosure, and at the same time, the third lock pin  33  provided in the third enclosure is fitted in the first round hole  23  provided in the second enclosure. Further, the slipping-off prevention cap  17  not shown here is fitted and fixed to the key  12 . 
         [0080]    As above, in the first position that is the stored state, the first enclosure  10  and the second enclosure  20  are integrated to sandwich the third enclosure  30 , and this position can be maintained by fitting of the lock pin and the round hole. 
         [0081]    In this state, the first lock pin  13  provided in the first enclosure  10  is pressed by the bottom surface portion of the third enclosure  30 , and therefore, the first detection switch  16  provided at the lower portion of the first lock pin  13  is in an ON state. Similarly, the fourth lock pin  35  provided in the third enclosure  30  is pressed by the bottom surface portion of the second enclosure  20 , and therefore, the second detection switch  36  provided at the lower portion of the fourth lock pin  35  is also in an ON state. 
         [0082]    Next, a shift to the second position in which the display device is used in the vertical orientation shown in  FIG. 1B  from the first position which is the stored state of the portable device  1  will be described by using  FIGS. 6A to 6C  and  7 A to  7 C. 
         [0083]      FIGS. 6A to 6C  are views of transition of slide movement of the portable device  1  to the second position from the first position seen from the top surface. Concerning the second enclosure  20 , a bottom surface is in a visible state by omitting the display  21  and the like, and the slipping-off prevention cap  17  is also omitted.  FIGS. 7A to 7C  are sectional views along the lines a to a′ in  FIGS. 6A to 6C . 
         [0084]      FIG. 6A  is a top view of the first position, and  FIG. 7A  is a sectional view taken in the line a to a′ in  FIG. 6A . The fourth lock pin  35  provided in the third enclosure  30  is invisible from the top surface, but is shown through the top surface for convenience. Since the fourth lock pin  35  is pressed by the back surface of the second enclosure  20  as shown in  FIG. 7A , the second detection switch  36  is turned ON, and the third lock pin  33  is fitted in the first round hole  23 . 
         [0085]      FIG. 6B  shows the state in which the second enclosure  20  is slid to move to the upper portion in the drawing from the state of  FIG. 6A , and  FIG. 7B  is a sectional view taken in the line a to a′ of  FIG. 6B . In this state, fitting of the first round hole  23  and the third lock pin  33  is released, and the second enclosure  20  slides to move to the upper portion in such a manner as to be guided by the restriction plates  38  provided in the third enclosure. The third lock pin  33  cannot be seen from the top surface, but is shown through the top surface for convenience here. 
         [0086]    Here, the third enclosure  30  is provided with only the round hole  32  for rotation, and does not have a long hole portion like the keyhole-shaped slit  22  of the second enclosure  20 , and therefore, cannot slide to move to the upper portion as the second enclosure  20 . Therefore, the third enclosure  30  maintains the state integrated with the first enclosure  10  by fitting of the second lock pin  15  and the third round hole  37 , and only the second enclosure  20  can slide to move in the upper direction. 
         [0087]      FIG. 7C  shows a view showing that the second enclosure  20  is further slid to move to the upper portion in the drawing from the state of  FIG. 7B , and is in the second position which is the state in which the display portion is used in the vertical orientation, and  FIG. 7C  is a sectional view in the line a to a′ in  FIG. 6C . 
         [0088]    In this state, the key  12  is butted against the terminal end of the long hole portion of the keyhole-shaped slit  22 , and further sliding movement from it is restrained, and at the same time, the second round hole  24  provided in the second enclosure and the fourth lock pin  35  provided in the third enclosure are fitted to be able to maintain this position. Specifically, in the state in which the display  21  provided on the second enclosure  20  is slid to move to the upper portion, the second operation part  31  provided on the third enclosure  30  is exposed, and the second operation part  31  can be used in the state in which the display  21  is seen in the vertical direction. In this state, the fourth lock pin  35  is fitted in the second round hole  24 , and therefore, the second detection switch  36  provided at the lower portion of the fourth lock pin  35  is in the OFF state. The positional relationship of the first enclosure  10  and the third enclosure  30  does not change, and therefore, the first detection switch  16  not shown remains in the ON state. 
         [0089]    The second enclosure  20  can be easily returned to the first position from the second position by sliding and moving the second enclosure  20  to the lower portion in the drawing. 
         [0090]    Next, a shift to the third position in which the display device is used in the horizontal orientation shown in  FIG. 1C  from the first position that is the stored state of the portable device  1  will be described by using  FIGS. 8A to 8C  and  9 A to  9 C. 
         [0091]      FIGS. 8A to 8C  are views of the transition of the rotational movement of the portable device  1  to the third position from the first position seen from the top surface. As for the second enclosure  20 , the bottom surface is in a visible state by omitting the display  21  and the like, and the slipping-off prevention cap  17  is omitted.  FIGS. 9A to 9C  are sectional views in the lines b to b′ in  FIGS. 8A to 8C . 
         [0092]      FIG. 8A  is a top view of the first position,  FIG. 9A  is a sectional view in the line b to b′ in  FIG. 8A . The first lock pin  13  provided in the first enclosure  10  cannot be seen from the top surface, but it is shown through the top surface for convenience. 
         [0093]    As described above, in the first position, the first round hole  23  and the third lock pin  33  are fitted to each other, and similarly, the third round hole  37  and the second lock pin  15  are fitted to each other. 
         [0094]      FIG. 8B  is a view showing the state in which the third enclosure  30  is rotated counterclockwise from the state of  FIG. 8A , and  FIG. 9B  is a sectional view in the line b to b′ of  FIG. 8B . In this state, fitting of the third round hole  37  and the second lock pin  15  is released, and the third enclosure  30  rotationally moves around the round hole  32  for rotation through which the key  12  penetrates. In this case, the restriction plates  38  are provided on both sides of the third enclosure  30 , and therefore, when the third enclosure  30  is rotationally moved, the second enclosure  20  also rotationally moves integrally with the third enclosure. 
         [0095]      FIG. 8C  is a view showing that the third enclosure  30  is further rotated counterclockwise from the state of  FIG. 8B , and is in the third position in which the display device is used in the horizontal orientation, and  FIG. 8C  is a sectional view in the line b to b′ in  FIG. 9C . In this state, the third round hole  37  provided in the third enclosure  30  is fitted to the first lock pin  13  provided in the first enclosure  10  to be able to maintain this position. Specifically, the first operation part  11  provided in the first enclosure  10  is exposed in the state in which the display  21  provided in the second enclosure  20  is rotationally moved to the upper portion, and the first operation part  11  can be used with the display  21  seen in the horizontal direction. 
         [0096]    In this state, the first lock pin  13  is fitted in the third round hole  37 , and therefore, the first detection switch  16  provided at the lower portion of the first lock pin  13  is in the OFF state. Since the positional relationship of the third enclosure  30  and the second enclosure  20  does not change, the second detection switch  36  not shown remains in the ON state. Counterclockwise rotation of the third enclosure  30  is restricted to the 90 degrees by a stopper not shown, and therefore, the third enclosure  30  does not rotate more than 90 degrees. 
         [0097]    Further, the portable device can be easily returned to the first position from the third position by rotationally moving the third enclosure  30  clockwise. At this time, the second enclosure  20  rotates integrally with the third enclosure  30  by the restriction plates  38 . 
         [0098]    Next, an operation of the portable device  1  will be described by using  FIGS. 10 and 11 .  FIG. 10  is a table showing an ON/OFF state of the first detection switch  16  and the second detection switch  34  at each position, and as described above, the combination of ON and OFF differs in accordance with each position.  FIG. 11  is a flowchart showing an operation state of the portable device  1 . 
         [0099]    First, the system control part  109  determines which state the portable device  1  is in based on ON/OFF information of the first detection switch  16  and the second detection switch  34 . First, the system control part  109  determines whether the portable device  1  is in the first position or not (step S 1 ). When it determines that the portable device is in the first position, it makes inputs of the first operation part  11  and the second operation part  31  invalid and brings the display  21  into a non-display state at the same time (step S 2 ), and reduces power consumption. The system control part  109  maintains the state until it determines that the position is shifted to another position. In the first position, the portable device is in a call waiting mode, and arrival of a telephone call and reception of an electronic mail are possible by the system control part  109  operating the telephone control part  102 . Thereafter, in any mode, arrival of a telephone call and reception of an electronic mail are possible. 
         [0100]    When the system control part  109  determines that the portable device is not in the first position, it determines whether the portable device is in the second position or in the third position next (step S 3 ). When it determines that the portable device is in the third position here, it makes the first operation part  11  valid, and causes the display  21  to display horizontally (step S 4 ). 
         [0101]    Next, the system control part  109  sets the portable device  1  in a television viewing and listening mode (step S 5 ), and causes the television control part  106  to operate to make television viewing and listening possible. Since at this time the first operation part  11  suitable for television viewing and listening is exposed and the operation is valid, channel switching, volume adjustment and the like are possible by using the first operation part  11 . 
         [0102]    The system control part always monitors the first detection switch  16  and the second detection switch  34  (step S 6 ), and when it determines that the position shifts to the first position, it makes the first operation part  11  invalid and stops display on the display (step S 2 ). 
         [0103]    In this state, it is possible to shift the portable device to a moving image reproduction mode from a television viewing and listening mode by using the first operation part  11  (step S 7 ). The mode switching may be performed by inserting external media into the storage part  107 . When the mode switching is performed, the system control part  109  sets the portable device  1  in the moving image reproduction mode (step S 8 ), stops the television control part  106  and operates the moving image reproduction control part  108  to enable moving image reproduction. At this time, the first operation part  11  suitable for moving image reproduction is exposed as in the television viewing and listening mode, and the input is made valid. Therefore, start, stop and temporary stop of reproduction, volume adjustment and the like are possible by using the first operation part  11 . 
         [0104]    As in the television viewing and listening mode, the system control part always monitors the first detection switch  16  and the second detection switch  34  (step S 9 ), and when it determines that the portable device shifts to the first position, it makes the first operation part  11  invalid, and stops the display on the display (step S 2 ). 
         [0105]    It is possible to shift the portable device to the television viewing and listening mode from the moving image reproduction mode (step S 10 ), and when mode switching is performed, the system control part  109  sets the portable device  1  in the television viewing and listening mode (step S 5 ), and stops the moving image reproduction control part  108  and operates the television control part  106  to enable television viewing and listening. 
         [0106]    When the system control part  109  determines that the portable device is in the second position in step S 3 , it makes the second operation part  31  valid and allows the display  21  to display in the vertical orientation (step S 11 ). Next, the system control part  109  sets the portable device  1  in the call mode (step S 12 ), and controls the telephone control part  102 , whereby a call to an optional number, transmission of an electronic mail, address book search and the like are enabled in addition to arrival of a telephone call and reception of an electronic mail which are possible in all the modes. Since at this time, the second operation part  31  suitable for the telephone function is exposed, and the input is valid, favorable usability is obtained. 
         [0107]    The system control part always monitors the first detection switch  16  and the second detection switch  34  (step S 13 ), and when the system control part determines that the portable device shifts to the first position, it makes input of the second operation part  31  invalid, and brings the display  21  into a non-display state (step S 2 ). 
         [0108]    It is possible to shift the portable device to a camera mode from the call mode by using the second operation part  31  (step S 15 ). When mode switching is performed, the system control part  109  sets the portable device  1  in the camera mode (step S 15 ), controls the telephone control part  102  to limit the telephone function only to arrival of a telephone call and reception of an electronic mail, and operates the camera control part  103  to enable image-taking. At this time, the second operation part  31  suitable for image-taking is exposed as in the call mode, and the input is valid. Therefore, image-taking mode switching, zoom adjustment and actual image-taking are possible by using the second operation part  31 . 
         [0109]    The system control part  109  always monitors the first detection switch  16  and the second detection switch  34  as in the call mode (step S 16 ). When the system control part  109  determines that the portable device shifts to the first position, it makes the second operation part  31  invalid and brings the display  21  into a non-display state (step S 2 ). 
         [0110]    Further, it is possible to shift the portable device to the call mode from the camera mode (step S 17 ), and when mode switching is performed, the system control part  109  sets the portable device  1  in the call mode (step S 12 ), and stops the camera control part  103  and controls the telephone control part  102  to enable a call and electronic mail transmission. 
         [0111]    Next, the third enclosure  30  will be described by using  FIG. 12 .  FIG. 12  is an exploded perspective view of the third enclosure  30 . The third enclosure  30  includes a top surface part  30   a  including the second operation part  31 , the third lock pin  33 , the fourth lock pin  35  and the restriction plates  38 , a membrane switch  90  and a lower surface part  30   b , and is configured so that the top surface part  30   a  and the lower surface part  30   b  sandwich the membrane switch  90 . 
         [0112]    The membrane switch  90  connects to the main board  110  of the first enclosure  10  by using a flexible printed board not shown as the signals of the second detection switch  36  and the microphone  39 . By adopting such a configuration, the button arrangement of the first operation part  11  and the button arrangement of the second operation part  31  can be freely set, and the button arrangement suitable for each function can be made. 
         [0113]    The third enclosure  30  is not limited to the embodiment, and may be configured as shown in  FIG. 13 . The third enclosure  30  shown in  FIG. 13  includes only key tops of the operation buttons, and when the key top is pressed, the key shaft projects from a hole portion for a key shaft provided in the bottom surface portion of the third enclosure  30 . 
         [0114]      FIG. 13  is an exploded perspective view of the third enclosure  30 . The third enclosure  30  includes the top surface part  30   a  including the third lock pin  33 , the fourth lock pin  35  and the restriction plates  38 , the lower surface part  30   b  including the hole portions for key shafts, and a key top group  130 , and is configured so that the top surface part  30   a  and the lower surface part  30   b  sandwich the key top group  130 . 
         [0115]      FIG. 14  is a sectional view of the second operation part  31  of the third enclosure and the first operation part  11  of the first enclosure  10  in the second position. As described above, in the second position, only the second enclosure  20  slides to move, the third enclosure  30  and the first enclosure  10  are integrated, and the second operation part  31  of the third enclosure  30  is exposed by the second enclosure  20  sliding to move. At this time, the positional relationship of the operation buttons of the second operation part  31  and the first operation part  11  has the configuration as shown in  FIG. 14 . Specifically, the first key top  131  of the second operation part  31  is disposed directly above a first operation button  111  of the first operation part  11 , and the second key top  132  of the second operation part  31  is disposed directly above a second operation button  112  of the first operation part  11 . 
         [0116]    By disposing them as above, by a user pressing the first key top  131 , the key shaft of the first key top  131  presses the first operation button  111  through the hole portion for the key shaft, and by the user pressing the second key top  132 , the operation of the key shaft of the second key top  132  pressing the second operation button  112  through the round hole for the key shaft becomes possible. 
         [0117]    The system control part  109  can determine which position of the second position and the third position the portable device is in by the ON/OFF state of the position detection switch in advance as shown in  FIG. 9 , and therefore, it can distinguish whether the input of the first operation button  111  is the input made by directly pressing the first operation button  111  or the input made by pressing the first operation button  111  made by pressing the first key top  131 . 
         [0118]    As shown in  FIG. 13 , if all the key tops of the second operation part  31  are configured as above, the structure is simplified, exchange of signals of the flexible printed boards of the third enclosure  30  and the first enclosure  10  can be reduced, and cost can be reduced. 
         [0119]    As shown in  FIG. 14 , it is possible to dispose a third key top  133  including two key shafts and hole portions for key shafts with one operation button directly above a third operation button  113   a  and a fourth operation button  113   b  of the first operation part  11 . By adopting such a configuration, the key shaft of the third key top  133  presses the third operation button  113   a  through the round hole for the key shaft when the left side of the third key top  133  is pressed, the key shaft of the third key top  133  presses the fourth operation button  113   b  through the round hole for the key shaft when the right side of the third key top  133  is pressed, and the key shafts of the third key top  133  press both the third operation button  113   a  and the fourth operation button  113   b  through the round holes for the key shafts when the center of the third key top  133  is pressed, and they can be assigned to different functions respectively. 
         [0120]    As shown in  FIG. 14 , it is possible not to dispose a key top of the second operation part  31  directly above the fifth operation button  114  of the first operation part  11 . 
         [0121]    As above, according to the present invention, the portable device can be brought into the use state from the stored state by one action, the orientation of the display can be changed in correspondence with the use purpose, and the operation part corresponding to the use purpose can be used. Therefore, portable device with high usability can be realized. 
       Second Embodiment 
       [0122]    The portable device  1  of a second embodiment according to the present invention will be described by using  FIGS. 15 to 20 . The same reference numerals are given to the parts common to the first embodiment, and the detailed description of them will be omitted. 
         [0123]      FIGS. 15A to 15C  are perspective views of the portable device  1  of the second embodiment according to the present invention seen from the front.  FIG. 15A  shows the first position that is the stored state.  FIG. 15B  shows the second position that is a state of using the display device in a vertical orientation.  FIG. 15C  shows the third position that is a state of using the display device in a horizontal orientation. In a second operation part  71  shown in  FIG. 15B , operation buttons for the telephone and camera are placed, and in a first operation part  51  shown in  FIG. 15C , operation buttons for TV viewing and listening and moving image reproduction are placed. 
         [0124]      FIGS. 16A to 16C  are perspective views of the portable device  1  seen from the rear side.  FIG. 16A  shows the first position.  FIG. 16B  shows the second position.  FIG. 16C  shows the third position. As shown in  FIG. 16B , an image-taking lens  27  is placed on a rear surface portion of a second enclosure  60 . 
         [0125]    Next, a joint mechanism (link mechanism) of the portable device  1  of the second embodiment according to the present invention will be described by using  FIG. 17 .  FIG. 17  is an exploded perspective view of the portable device  1 , and the second enclosure  60  is illustrated so that a bottom surface is seen from a top portion by omitting a display  21  and the like as in the description of the first embodiment. 
         [0126]    Reference numeral  52  denotes a parallel-linking mechanism constituted of a link arm  52   a  and a plate  52   b , and reference numerals  53  and  54  denote a first projection portion and a second projection portion provided on a plate  52   b . A fifth lock pin  56  and a sixth lock pin  57  are placed on the first enclosure  50 , in addition to a fifth round hole  55  provided in the link arm  52   a.    
         [0127]    A first lock spring  63 , a second lock spring  64  and a rail groove  65  are placed on the second enclosure  60 . A first round hole  73  and a second round hole  74  are placed in a third enclosure  70 , and are respectively fitted to the first projection portion  53  and the second projection portion  54  provided on the plate  52   b , and thereby, the first enclosure  50  and the third enclosure  70  are integrated. A rail  75  is fitted in a rail joining groove  76  to sandwich the second enclosure  60 , and thereby, the second enclosure  60  and the third enclosure  70  are integrated. As above, the portable device  1  of the second embodiment according to the present invention has the constitution in which the first enclosure  50 , the second enclosure  60  and the third enclosure  70  are integrated. 
         [0128]      FIGS. 18A ,  18 B and  18 C are views of the respective enclosures seen from top portions.  FIG. 18A  is a view of the second enclosure  60  seen from the top portion, and shows the first lock spring  63 , the second lock spring  64  and the rail groove  65 , but omits the round hole  25  for a lens.  FIG. 18B  is a view of the third enclosure  70  seen from the top portion, and shows the restriction plates  38  and the rail  75 .  FIG. 18C  is a view of the first enclosure  50  seen from the top portion, and shows the fifth round hole  55  provided in the link arm, the fifth lock pin  56  and the sixth lock pin  57  provided on the first enclosure  50 , in addition to the parallel-linking mechanism  52 , with the fifth hole  55  for lock and the fifth lock pin  56  fitted to each other. 
         [0129]      FIGS. 19A to 19D  are views of transition of vertical slide movement of the portable device  1  from the first position that is a stored state to the second position that is a state of using the display device in a vertical orientation seen from the top side, and as for the second enclosure  60 , the bottom surface is visible from the top portion by omitting the display  21  and the like. 
         [0130]      FIG. 19A  is a view of the state of the first position seen from the top side, and the first lock spring  63  provided in the second enclosure  60  engages with a V groove (see  FIG. 17 ) formed at a side portion of the rails  75  joined to the third enclosure  70 . 
         [0131]      FIG. 19B  is a view showing a state in which the second enclosure  60  is slid to move to the upper portion of the drawing from the state of  FIG. 19A . In this state, engagement of the first lock spring  63  and the V groove of the rail  75  is released, and the second enclosure  60  slides to move straight to the upper portion by being guided by the restriction plates  38  at both sides of the third enclosure  70 . Here, the third enclosure  70  is joined to the first enclosure  50  by the parallel-linking mechanism  52 , and cannot slide and move to the upper portion together with the second enclosure  60 . Therefore, the third enclosure  70  remains to be integrated with the first enclosure  50 , and only the second enclosure  60  can slide and move. 
         [0132]      FIG. 19C  is a view showing that the second enclosure  60  is further slid and moved to the upper portion of the drawing from the state of  FIG. 19B , and the portable device is in the second position that is the state of using the display device in the vertical orientation. In this state, the rail  75  butts against a terminal end of the rail groove  65  to restrict further slide movement from it, and at the same time, the second lock spring  64  and the V groove of the rail  75  are engaged with each other, and can maintain this position. At this time, the position detecting mechanism not shown detects that the portable device is in the second position, and the system control part  109  makes the display of the display  21  in a vertical direction to make the second operation part  71  usable. 
         [0133]    Specifically, the second operation part  71  provided in the third enclosure  70  is exposed in the state in which the display  21  provided in the second enclosure  20  is slid and moved to the upper portion, and the second operation part  71  can be used with the display  21  seen in the vertical direction. Here, in the second position, the telephone function and camera function are usable, and as described above, the second operation part  71  becomes the operation part for a telephone and a camera as described above. 
         [0134]    The portable device can be easily returned to the first position from the second position by sliding and moving the second enclosure  60  to the lower portion of the drawing. At this time, the rail  75  is released from the engagement with the second lock spring  64 , and engages with the first lock spring  63  to return to the first position. By a position detecting mechanism not shown, it is detected that the portable device is in the first position, the input of the second operation  71  is made invalid, and the display  21  is brought into a non-display state. 
         [0135]    Next, a shift to the third position that is the state of using the display device in the horizontal orientation from the first position that is the stored state will be described by using  FIGS. 20A to 20C .  FIGS. 20A to 20C  are views of the transition of the horizontal slide movement of the portable device  1  from the first position to the third position seen from the top side, and the second enclosure  60  is omitted. 
         [0136]      FIG. 20A  is a view of the state of the first position seen from the top side. The parallel-linking mechanism and the lock spring included in the first enclosure  50  are not originally seen from the top side, but are shown through the top for convenience. In the first position, the fifth round hole  55  provided in the link arm  52   a  and the fifth lock pin  56  provided in the first enclosure are fitted to each other, and the state in which the first enclosure and the third enclosure are integrated is maintained. 
         [0137]      FIG. 20B  is a view showing the state in which the third enclosure  70  is slid and moved in the left direction from the state of  FIG. 20A . In this state, fitting of the fifth round hole  55  and the fifth lock pin  56  is released, and the third enclosure  70  moves along the circular arc drawn by the link arm. As for the second enclosure  60  and the third enclosure  70 , the second enclosure  60  slides and moves while remaining to be integrated with the third enclosure  70  by engagement of the rail  75  and the first lock spring  63  and the restriction plates  38 . 
         [0138]      FIG. 20C  is a view showing that the third enclosure  70  is further moved to the left from the state of  FIG. 20B , and is in the third position that is the state of using the display device in the horizontal orientation. In this state, the fifth round hole  55  and the sixth lock pin  57  are fitted to each other, and the position can be maintained. Movement of the third enclosure  70  is restricted to the third position by the stopper not shown, and therefore, the third enclosure  70  does not move to the left side from the third position. 
         [0139]    At this time, the system control part  109  detects that the portable device is in the third position by the position detecting mechanism not shown, and the system control part  109  makes the display of the display  21  in the horizontal orientation, and makes the first operation part  51  usable. 
         [0140]    Specifically, the first operation part  51  provided in the first enclosure  50  is exposed in the state in which the display  21  provided in the second enclosure  60  is slid and moved to the left portion, and by tilting the entire device at 90 degrees, the first operation part  51  can be used in the state in which the display  21  is seen in the horizontal direction. In the third position, the TV viewing and listening function and the moving image reproducing function are usable. As described above, the first operation part  51  is the operation part for TV viewing and listening and moving image reproduction. 
         [0141]    In order to return the portable device to the first position from the third position here, the second enclosure  60  and the third enclosure  70  are moved to the right side while they are kept to be integrated. The fifth round hole  55  releases from fitting with the sixth lock pin  57 , and is fitted to the fifth lock pin  56 . At this time, the system control part detects that the portable device is in the first position by the position detecting mechanism not shown, makes the first operation part  51  invalid, and brings the display  21  into a non-display state. 
         [0142]    As shown in  FIG. 16B , in the second position, the image-taking lens  27  is exposed, and by pointing the lens to a subject, and operating the button for camera operation, image-taking is possible. On the other hand, as shown in  FIGS. 16A and 16C , the image-taking lens  27  is not exposed in the first position and the third position, and therefore, the image-taking lens can be protected when the lens is not used. 
         [0143]    In this embodiment, the slit mechanism is used for slide movement to the second position from the first position, and the parallel-linking mechanism is used for slide movement to the third position from the first position. However, the parallel-linking mechanism may be used for slide movement to the second position from the first position, and the slit mechanism may be used for slide movement to the third position from the first position. 
         [0144]    In this embodiment, the slide movement to the second position from the first position and the slide movement to the third position from the first position are not restricted respectively, and therefore, the slide movement of both of them can be performed at the same time, but in this case, the operation of the position which the position detecting mechanism first detects is performed. Naturally, a restriction mechanism may be provided so as to perform only slide movement of any one of them. 
         [0145]    In this embodiment, as shown in  FIGS. 15A to 15C , the third enclosure  70  is integrated with the first enclosure  50  and fixed with the slide movement to the second position from the first position, and only the second operation part  71  provided on the third enclosure  70  is exposed in the second position. However, it goes without saying that by forming the first round hole  73  and the second round hole  74  which restrict the movement in the vertical direction of the third enclosure  70  to be long holes, for example, the third enclosure  70  may be constituted to move integrally with the first enclosure  50  partway to expose part of the first enclosure  50 , as long as the different operation parts are operable respectively in the second position and the third position. 
         [0146]      FIG. 21A  is a view showing the second position that is the state in which part of the first enclosure  50  is exposed. An operation member may be provided on the exposed part of the first enclosure  50 , and in this case, an operation member may be provided as long as the different operation parts are operable respectively in the second position and the third position. 
         [0147]    As shown in  FIGS. 15A to 15C , with the slide movement to the third position from the first position, the third enclosure  70  is integrated with the second enclosure  60  and fixed, and in the third position, only the first operation part  51  provided on the first enclosure  50  is exposed. However, it goes without saying that when with the method of giving the restriction plates  38  an allowance or the like, for example, the third enclosure  70  is completely integrated with the second enclosure  60  and does not move with the slide movement of the first enclosure  50  to the third position from the first position, part of it covers the surface of the first enclosure, and a part of the third enclosure  70  is exposed, the same operation can be obtained as long as the different operation parts are respectively operable in the second position and the third position. 
         [0148]      FIG. 21B  is a view showing the third position that is the state in which part of the third enclosure  70  covers the first enclosure  50  and part of the third enclosure  70  is exposed. An operation member may be also provided on the exposed part of the third enclosure as long as the different operation parts are operable in the second position and the third position in this case. 
         [0149]    The second operation part  71  may be eliminated in the third enclosure  70 , and in the second position in this case, the third enclosure  70  plays a role of covering the first operation part  51 . The microphone  39  is exposed, the positional relationship of the speaker  26  and the microphone  39  is such that they are separated at a distance favorable for a call, and the speaker  26  and the microphone  39  are applied to an ear and a mouth respectively, whereby the constitution with favorable usability in the telephone function is provided. 
         [0150]    Similarly, the first operation part  51  may be eliminated from the first enclosure  50 , and in the third position in this case, by tilting the entire device at 90 degrees and by holding the first enclosure  50  by hand in the sate in which the display  21  is seen in the horizontal direction, the constitution easy to hold is provided. 
       Third Embodiment 
       [0151]    By using  FIG. 22 , the portable device  1  of the third embodiment according to the present invention will be described. 
         [0152]    The portable device  1  of the third embodiment according to the present invention has the same constitution as in the second embodiment, but differs from the second embodiment in the point that in the third position which is the state of using the display in the horizontal orientation, a game function is usable, and a first operation part  81  provided in a first enclosure  80  is the operation part for game. 
       Fourth Embodiment 
       [0153]    By using  FIG. 23 , the portable device  1  of the fourth embodiment according to the present invention will be described. 
         [0154]    The portable device  1  of the fourth embodiment according to the present invention has the same constitution as the second embodiment, but differs from the second embodiment in the point that in the third position which is the state of using the display in the horizontal orientation, a PDA function is usable, and a first operation part  83  provided in a first enclosure  82  is a full keyboard.