Abstract:
An information processing apparatus which comprises a main body in a flat, plane box shape, a flat input section provided on the front surface of the main body, a stand, provided on the rear surface of the main body, having two or more tilting positions relative to the main body where It is preferable that the stand has a retracted position wherein the stand falls down into the rear surface of the main body, a first tilt position where the main body in-clines at a relatively small angle to a desk surface, and a second tilt position where the main body inclines at a relatively large angle to the desk surface. In the first tilting position, the main body is inclined slightly toward the front relative to the desk surface. With the main body thus positioned, it is easy to manipulate a pen held against the input face of the input section. In the second tilt position, the main body is held almost upright relative to the desk surface. When an external keyboard, for example, is attached to the main body for data input with the input section being used only as a display, and the main body is in the second tilt position, an operator can see the display easily while using the keyboard, and the computer&#39;s usability is enhanced. In the retracted position, the stand is fully retained in the rear surface of the main body, and the thickness of the main body is not expanded with the stand in this position, so that the computer can be carried or stored.

Description:
This application is a divisional No. 08/891,925 filed Jul. 14, 1997, now U.S. Pat. No. 6,016,248. 
    
    
     FIELD OF THE INVENTION 
     The present invention relates to a hand type tablet computer, and in particular to a tablet information processing apparatus that has a main body in a flat, plane box shape. More specifically, the present invention pertains to an information processing apparatus that is preferably employed for utilizations such as the input of data using a tablet or using a keyboard. 
     BACKGROUND OF THE INVENTION 
     In accordance with recent technical development, portable computers that are compact, light and easy to carry have been produced and are available on the market. FIG. 20 is an outline diagram of a common portable computer (IBM ThinkPad 560 (“ThinkPad” is a trademark of IBM Corp.)). The computer includes a main body on which a keyboard unit is mounted, and a cover unit in which a liquid crystal display is provided. That is the portable computer has a clam shell structure where the cover unit is pivotaly hinged on the almost rear edge of the main body. The portable computer has, for example, an A 4  or a B 5  footprint, and weighs 2 kilo grams or less, and can be fit into a bag for carrying. 
     In accordance with the expanding needs of users, various forms of portable computers have been manufactured. Some portable computers have been designed that provide an input tablet on a liquid crystal display to enable pen input. A portable, tablet input type computer is disclosed in, for example, Japanese Patent Application No. Hei 4-301950 (Japanese Unexamined Patent Publication No. Hei 6-202806) which is assigned to the present assignee. 
     For the portable, tablet input type computer (hereinafter referred to as a “tablet computer”), as input means, a tablet replaces a keyboard. Therefore, a common tablet type computer, which has a flat, plane box shaped main body, does not have keyboards as standard equipment, and has a tablet that also serve as displays provided on their fronts. While an operator is looking at a tablet display of a tablet computer, the operator indicates a desired position by using a pen, instead of inputting at a desired key, to input data or commands. 
     The manner in which clam shell type portable computers are used is standardized. More specifically, when this type of computer is not being used, such as when it is being transported, the cover unit is closed to hide and protect the liquid crystal display and the keyboard surface which are relatively easily damaged by mechanical impact. When the computer is to be used, the main body is placed on the flat surface of a desk, or on a lap, and the cover unit is opened to permit viewing of the display and manipulation of the keyboard. 
     On the other hand, the manner in which the tablet computers are used is not always standardized. For a tablet computer, a pen may be used for data input, or an external keyboard unit may be attached for data input using keys. In the latter case, the tablet is used only as a display. The pen input operation may be performed on a desk, or by holding the pen in one hand and supporting the computer with the other hand. Pen input operation is relatively easy with a tablet computer having a main body in a flat, plane box shape when the computer is placed flat on a desk Because an operator can manipulate a pen while looking down at the tablet display. However, for data input using an external keyboard, an operator must view a display, lying flat on a desk, at an acute angle, and this arrangement makes the operation difficult. Especially for a display that has a narrow visual angle, an operator is forced to take an unnatural posture in order to perform key input while viewing the display. 
     In addition, even for performing pen input on a desk, it is evident that, from the aspect of human engineering, an input face that is slightly inclined toward an operator provides better usability than does a flat input face. 
     In short, the conventional tablet computer having a main body in a flat, plane box shape is satisfactory only for pen input on a desk, and is not suitable when used in other ways. 
     Various “tilting mechanisms” for inclining a keyboard toward the front relative to a horizontal face have been proposed for the conventional clam shell portable computers. In, for example, the specification for Japanese Patent Application No. Hei 3-290406 (Japanese Unexamined Patent Publication No. Hei 5-119885) is disclosed a tilting mechanism constituted by a pair of folding stand provided on the bottom of a portable computer. Such a tilting mechanism effectively enhances the usability for key input. The tilting mechanisms, however, generally have a single tilting angle, and are not satisfactory for use when a computer is supported by one hand and a pen is held in the other hand. The tilting mechanisms were originally provided to incline the typing face of the keyboard, not for providing an enhanced tablet data input operation. When a tablet is used as a display that is inclined at only a small angle by the folding stand, it is difficult for an operator to see the display- In order to make the above described inventions suitable for the other applications, such as for tablet input, or for use as a display, it is desirable that different types of stands having different lengths be prepared. 
     It is, therefore, one object of the present invention to provide a superior tablet type information processing apparatus having a main body in a flat, plane box shape. 
     It is another object of the present invention to provide an improved information processing apparatus that can also be appropriately employed in several ways, such as for tablet input or for key input with a keyboard. 
     SUMMARY OF THE INVENTION 
     To achieve the above objects, according to the present invention, an information processing apparatus comprising: a main body in a flat, plane box shape; a flat input section provided on the front surface of the main body; a stand, provided on the rear surface of the main body, having two or more tilting positions relative to the main body. The flat input section is, for example, a tablet that also serves as a display, and data can be input using a pen. The tablet may be either an electromagnetic induction type or a pressure sensitive type. 
     It is preferable that the stand has a retracted position wherein the stand falls down into the rear surface of the main body, a first tilt position where the main body inclines at a relatively small angle to a desk surface, and a second tilt position where the main body inclines at a relatively large angle to the desk surface. In the first tilting position, the main body is inclined slightly toward the front relative to the desk surface (see FIG.  16 ). With the main body thus positioned, it is easy to manipulate a pen held against the input face of the input section. In the second tilt position, the main body is held almost upright relative to the desk surface (see FIG.  17 ). When a keyboard unit (an external keyboard), for example, is attached to the main body for data input with the input section being used only as a display, and the main body is in the second tilt position, an operator can see the display easily while using the keyboard, and the computer&#39;s usability is enhanced. Since in the retracted position, the stand is fully retained in the rear surface of the main body, and the thickness of the main body is not expanded with the stand in this position, so that the computer can be carried or stored. 
     The stand includes: a handle, fabricated by bending a rod into a U shape; a pair of shafts, one formed at either end of the handle; bearings formed at the rear surface of the main body, for rotatively supporting the pair of shafts; a tongue piece, rotatively attached to the handle at almost the center of the U shape; and an engagement portion formed at the rear surface of the main body, for engaging a tip of the tongue piece in the first bit position. The bearings generate a friction having a predetermined resistive force, or greater, relative to the rotation of the handle. 
     In the U shape handle fabrication configuration, the first tilt position is provided by opening the handle until it describes an acute angle with the rear face of the main body, and then directing the tip of the tongue piece toward the rear face and engaging it with the engagement portion (see FIG.  16 ). As is apparent from FIG. 16, at the first tilt position, great gravitational moment is imposed at the center of gravity of the main body, and the handle in the inclined state can not be supported by only the force of the friction supplied by the bearings. The tip of the tongue piece, therefore, is brought into contact with the engagement portion to prevent the handle from falling. 
     The second tilt position is provided by opening the handle until it describes an obtuse angle with the rear face of the main body (see FIG.  17 ). As is apparent from FIG. 17, at the second tilt position, a smaller gravitational moment is imposed at the center of gravity of the main body, and the handle in the inclining state can be adequately supported by only the force of the friction supplied by the bearings. 
     The U-shaped handle can also be used as a handle for holding the main body. As is shown in FIG. 18, for example, an operator holds the main body by inserting one hand (not usually the dominant hand) through the U-shaped handle, and can enter data with a pen while holding the main body in the palm (palmtop operation). The handle can also be used as a hook for suspending the main body from a wall (see FIG.  19 ). 
     Since this structure can be provided by combining relatively simplistic parts, it is superior as regards manufacturing costs, weight and durability, and has no adverse effect on portability. 
     That is, according to the present invention, an information processing apparatus can be provided that can be appropriately employed for tablet input or key input by attaching a keyboard. 
     The main body may include a pen attachment portion on one side. The pen attachment portion comprises: a pen storage portion recessed along the side of the main body; an insertion portion, formed at one end of the pen storage portion, into which a pen tip is inserted; a slide knob formed to slide longitudinally along the pen storage portion; and a lever for transforming a substantially linear movement of the slide knob toward the tip of the pen into a substantially rotational movement of the pen at the tip of the pen, and for pushing the pen forward. The structured pen attachment portion can enhance usability, and as it can be provided by combining uncomplicated parts, it is superior as regards manufacturing cost, weight and durability. 
     The main body may have a PC card slot in its top. Some types of PC cards, such as a LAN card, that are to be inserted into the slot have a cable extending from the end. If the slot is formed on the left or right side and the connector for the cable is on the opposite side, the cable must be carried around the main body, and the installation is inconvenient. When the slot is formed in the top, the cable can be relatively freely extended in every direction, and the installation problem can be reduced. 
     The main body may include battery storage sections in substantially lower portions on both sides. Generally, a minimum two hour battery operation period is required for a portable device, and at least four battery cells must be employed. However, for an information processing apparatus having a B 5  footprint or smaller, while taking other incorporated parts into consideration, it is difficult to obtain, at one location, the relatively large amount of space needed to hold four battery cells. In this invention, therefore, the battery storage sections are formed in the lower portions of the respective sides of the main body. Design restrictions can be eased by providing two separate storage sections. Although the battery cells are heavier than the other electronic parts and the casing, they are uniformly located at the lower positions on both sides so as to maintain the weight balance of the main body. 
     The other objects, features, and advantages of the present invention will become apparent in due course during the detailed description of the embodiment of the present invention, which will be given while referring to the accompanying drawings. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     The invention is pointed out with particularity in the appended claims. The stated advantages of the invention may be better understood by referring to the following detailed description in conjunction with the drawings in which: 
     FIG. 1 is a front perspective view of a tablet computer that is appropriate for carrying out the present invention. 
     FIG. 2 is a front view of the computer. 
     FIG. 3 is a plan view of the computer. 
     FIG. 4 is a view of the left side of the computer. 
     FIG. 5 is a view of the right side of the computer. 
     FIG. 6 is a view of the rear of the computer. 
     FIG. 7 is a view of the bottom of the computer. 
     FIG. 8 is a diagram showing a PC card slot and its periphery on the top face of the computer. 
     FIG. 9 is a diagram showing the condition when power is to be supplied from a commercially available source to the computer via an AC adaptor. 
     FIG. 10 is a diagram showing the condition when an external keyboard is to be connected to the computer. 
     FIG. 11 is a diagram showing the condition when a telephone cable/fax cable is to be connected to the computer. 
     FIG. 12 is a detailed diagram showing the structure of a pen attachment portion. 
     FIG. 13 is a diagram showing the operation of the pen attachment portion, with FIG.  13 ( a ), more specifically, showing the condition where a pen is retained, FIG.  13 ( b ) showing the condition where a slide knob is moved to remove the pen, and FIG.  13 ( c ) being an enlarged diagram showing a lever when the pen is removed. 
     FIG. 14 is a diagram showing battery storage sections that are provided on both lower sides of the rear face of the tablet computer, with FIG.  14 ( a ), more specifically, showing the condition when battery covers are open, FIG.  14 ( b ) showing the condition when battery packs are inserted into the respective storage sections, and FIG.  14 ( c ) showing the condition when the battery covers are to be closed. 
     FIG. 15 is a diagram showing the assembly of a handle and associated parts. 
     FIG. 16 is a diagram showing the tablet computer when it is used for pen input, with FIG.  16 ( a ) being a rear perspective view and FIG.  16 ( b ) being a left side view. 
     FIG. 17 is a diagram showing the tablet computer when it is used as a display, with FIG.  17 ( a ) being a rear perspective view and FIG.  17 ( b ) being a left side view. 
     FIG. 18 is a diagram showing the tablet computer  100  when it is used as a handy-use type, with FIG.  18 ( a ) being a rear perspective view and FIG.  18 ( b ) being a left side view. 
     FIG. 19 is a diagram showing the tablet computer when it is used as a wall suspended type, with FIG.  19 ( a ) being a rear perspective view and FIG.  19 ( b ) being a left side view. 
     FIG. 20 is an outline diagram of a common portable computer. 
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
     The preferred embodiment of the present invention will now be described while referring to the accompanying drawings. 
     A. External appearance of tablet computer 
     FIGS. 1 through 7 are diagrams illustrating the external appearance of a tablet computer  100  that embodies the present invention. The respective sections are described as follows. 
     Outline of computer body: 
     The computer  100  is a portable computer that can be driven by incorporated batteries (not shown), and has a system main body in a flat, plane box shape with a B 5  footprint or smaller. As is apparent from FIG. 1, the computer body is constituted by a front bezel  10  that supports a flat display panel  11 , and a shallow rear case  30 . In the space enclosed by the front bezel  10  and the rear case  30  are a system board (not shown), on which a CPU, various controller chips and memory are mounted, and in which a hard disk drive (not shown), as an external storage device is accommodated. The computer  100  is so designed that it can perform data processing. 
     The flat display panel  11  is made by laminating an input tablet over a liquid crystal display (LCD), and supports the handwriting input function for which a pen  50  is used. The input tablet can be either an electromagnetic induction type or a pressure sensitive type. An operator can input data and commands directly via the flat display panel  11  by using the pen  50 . 
     Front face of computer body: 
     As is apparent from FIGS. 1 and 2, there is a raised portion  12 , substantially as wide as a thumb, along the left edge of the flat display panel  11  on the top face of the front bezel  10 . On the raised portion  12  are provided a power switch  12   a,  for turning power on and off; an LED indicator set  12   b,  for displaying a system operating state; a suspend switch  12   c;  and a microphone  12   d,  for audio input. The LED indicators  12   b  indicate operating states, such as the accessing of an HDD (not shown), battery charging and a remaining battery capacity. The suspend switch  12   c  is a control switch for entering the system to a power saving state, called a “suspend mode,” and for resuming the system to the normal operating state. Before the system enters the suspend mode, necessary system data are saved in advance in a backup memory. When the system is to be resumed to the normal operating mode, the saved data are restored in their original locations, and the interrupted task is re-started. 
     Top face of computer body: 
     As is apparent from FIGS. 1 and 3, in the top of the computer body are formed a microphone jack  13   a,  a headphone jack  13   b,  a PC card slot cover  13   c,  a contrast adjustment dial  13   d,  and a volume adjustment dial  13   e.  The contrast adjustment dial  13   d  is used to adjust screen contrast for the flat display panel  11 , with the rotational movement of the dial  13   d  being transmitted to an internal inverter (not shown). The volume adjustment dial  13   e  is used to control the volume of a loudspeaker, which will be described later, with the rotational movement of the dial  13   e  is transmitted to an internal audio amplifier (not shown). 
     The PC card slot cover  13   c  is so attached to the top face of the main body that it can be freely opened and closed. An operator can open the cover  13   c  by, for example, hooking his or her finger nail into a notch at the front edge of the cover  13   c  (see FIG.  8 ). A PC card that conforms to the standards specified by the PCMCIA/JEIDA can be inserted through the PC card slot. In this embodiment, two PC cards of type /, or one PC card of type can be employed. Some PC cards, such as LAN cards (e.g., Tokenring cards or Ethernet cards), that are inserted through the card slot have cables extending from their ends. If the PC card slot were formed on the right or the left side, and the connector for such cable were located on the opposite side, the cable would have to be carried around the main body and its installation would be inconvenient. In this embodiment, however, since the card slot is formed on the top face, the cable can be therefore relatively freely extended in every direction, and the installation problem can be reduced. 
     Left side of computer body: 
     As is shown in FIG. 4, on the left side of the computer body are provided a DC inlet  14   a,  an external keyboard port  14   b,  a loudspeaker  14   c,  and a modem/fax port  14   d.    
     An AC adaptor cable can be connected to the DC inlet  14   a,  so that the computer  100  can be powered by a commercially available power source via the AC adaptor (see FIG.  9 ). An external keyboard can be connected to the external keyboard port  14   b,  as is shown in FIG. 10, and the computer  100  can also serve as a display for a key input type computer. The modem/fax port  14   d  has a cover that can be opened and closed. When the cover is opened to an angle of approximately 45°, a jack for a telephone cable or a fax cable can be obliquely inserted (see FIG.  11 ). A jack cover similar to that shown in FIG. 11 is disclosed in the specification of Japanese Patent Application No. Hei 6-279510 (Japanese Unexamined Patent Publication No. Hei 8-138796) which is assigned to the present assignee. 
     Right side of computer body: 
     As is shown in FIGS. 1 and 5, a pen attachment portion  60  is provided on the right side of the computer body for the attachment thereto of the pen  50  for tablet input. The provision of the pen attachment portion  60  makes it possible for the pen  50  to be carried with the computer  100 . 
     FIG. 12 is a detailed diagram illustrating components of the pen attachment portion  60 , and the assembly structure. The pen attachment portion  60  is constituted by a holder  61 , for retaining the pen  50 , and a slide knob  62 . 
     The holder  61  is an elongated, coverless box large enough to hold the pen  50 , and is embedded in a groove formed in the right side of the computer body, as is shown in FIG.  1 . An insertion port  65  is formed in one end of the holder  61  in which the tip of the pen  50  is inserted. A flexible lever  63  is integrally formed with the bottom of the holder  61 . A protrusion  63   a  is formed on the upper edge of the lever  63 , and projects outward through a notch in the upper face of the holder  61 . A pair of guides  64   a  and  64   b  are formed on the upper face of the holder  61 . Formed in the guides  64   a  and  64   b  are dovetailed grooves, in which the side edges of the slide knob  62  are held to control the longitudinal movement of the slide knob  62 , which will be described later. 
     The slide knob  62  includes a knob body, which is exposed on the surface of the computer body and which an operator can manipulate, and a plate having a convex shape, which is formed perpendicular to the knob body. A linear slot  62   d  is obliquely formed substantially in the center of the plate, and the projection  63   a  of the lever  63  is inserted through the linear slot  62   d.  As bottom portions  62   a  and  62   b  of the plate slide in the dovetailed grooves of the corresponding guides  64   a  and  64   b  of the holder  61 , the slide knob  62  is moved in the longitudinal direction. In addition, since the convex portion  62   c  is held by the sides of the guides  64   a  and  64   b,  the distance the slide knob  62  moves is defined. 
     FIGS.  13 ( a ) through  13 ( c ) are diagrams illustrating step by step the operating states for the pen attachment portion  60 . In FIG.  13 ( a ) is shown the state where the pen  50  is completely enclosed by the holder  61 . When the slide knob  62  is moved in the direction indicated by the arrow A, the protrusion  63   a  of the lever  63  slides along the linear slot  62   d,  as is shown in FIG.  13 ( b ). As a result, as is shown in FIG.  13 ( c ), the lever  63  is bent in the direction indicated by the arrow B, i.e., toward outside, and contacts the pen  50  and pushes it outward. 
     It will be understood by one having ordinary skill in the art that the structured pen attachment portion  60  can be provided by combining parts of uncomplicated design and configuration, and is superior as regards manufacturing costs, weight and durability. 
     Bottom face of computer body: 
     As is shown in FIG. 7, linear protrusions  15   a  and  15   b  are formed on the bottom face of the computer body. When the computer body is set at the second tilt position, i.e., when it is raised substantially upright relative to the support face on which the computer is installed, the linear protrusions  15   a  and  15   b  contact the support face. 
     Rear face of computer body: 
     As is shown in FIGS. 4 through 7, battery covers  16   a  and  16   b  are so provided on both lower side portions of the rear face of the computer body that they can be freely opened and closed. 
     Portions having a plurality of linear narrow protrusions are provided on the sides of the battery covers  16   a  and  16   b.  An operator grasps these portions with fingers and pulls them in the directions indicated by arrows in FIG.  14 ( a ) to open the battery covers  16   a  and  16   b.    
     When the battery covers  16   a  and  16   b  are open and battery storage sections are exposed, battery packs having the same shape and size can be inserted into the battery storage sections in the directions indicated by the arrows in FIG.  14 ( b ). Finally, the battery covers  16   a  and  16   b  are moved in the directions indicated by the arrows in FIG.  14 ( c ) to shield the storage sections. 
     Generally, a minimum two hour battery operation period is required for a portable computer, and at least four battery cells must be employed. However, since the computer  100  is so designed that it has a  85  footprint or smaller, while taking into consideration the arrangement of other built-in components, it is difficult to obtain, at one location, the relatively large amount of storage space needed to hold four battery cells. This is why the battery storage sections are provided in the lower side portions of the computer body. For this arrangement, the location restrictions can be eased. Although the battery cells are heavier than the other parts, they are uniformly located at the lower positions on both sides to maintain the weight balance of the computer body. 
     As is shown in FIG. 6, a plurality (four on each side) of relatively long linear protrusions are formed along the sides of the rear face of the computer body, and extend in the direction of the height of the computer body. When an operator holds the computer body with one hand, these linear protrusions effectively prevent the computer from slipping off the hand. 
     Further, as is shown in FIG. 6, a handle  20  made of a U-shaped rod is attached substantially in the center of the rear face so that it is rotatable relative to the rear face. FIG. 15 is a diagram showing the assembly of the handle  20  and its peripheral parts. 
     The handle  20  is an approximately 2.6 mm diameter rod and is made of fine, strong material, such as piano wire, stainless steel or aluminum. Both ends of the U-shaped handle  20  are bent in the direction of the rotational axis of the handle  20  to provide shafts  20   a  and  20   b.  The handle  20  can serve as a stand or a hand strap, or as a hook for hanging the computer on a wall, which will be explained later. 
     Bearings  23   a  and  23   b  have elongated holes through which the shafts  20   a  and  20   b  of the handle  20  are inserted. The bearings  23   a  and  23   b  are fixed in predetermined positions on the rear face of the computer body by respective stoppers  24   a  and  24   b.  Since the bearings  23   a  and  23   b  caulk the shafts  20   a  and  20   b,  friction having a predetermined resistive force, or greater, acts to restrict the rotation of the handle  20 . 
     A tongue piece  21  is a plate member, along one side of which is formed a narrow groove having the same width as that of the handle  20 . Since the narrow groove supports the center of the handle  20  and a rubber sheet  22  encloses the tongue piece  21 , the tongue piece  21  is rotatively attached to the handle  20 . The tongue piece  21  is also used as a stand for supporting the inclined computer body for a pen-input operation. When the computer is employed as a display, the tongue piece  21  stabilizes the handle  20 , which serves as the stand for the computer and which will be described later. In addition, as the rubber sheet  22  is elastic, it can serve as a stand stopper, and can also serve as a buffer member when the handle  20  is used as a hand strap to reduce the stress imposed on an operator&#39;s hand. 
     A linear engagement protrusion  25  is formed on the rear face of the computer body. The engagement protrusion  25  is used to hold the distal end of the tongue piece  21  at the first tilt position, which will be explained in detail later. 
     B. Tilting mechanism for the tablet computer: 
     For the computer  100  in this embodiment there are a plurality of ways in which the handle  20  can be used. The respective ways in which it can be used will now be explained in detail while referring to FIGS. 16 through 19. 
     Use during pen input (first tilt position): 
     When the tablet computer  100  is employed for pen input at a desk, for an operator it is preferable that, relative to the desk surface, the flat display panel  11  be slightly inclined toward the front, i.e., that the computer  100  be set at the first tilt position, so that he or she can easily move the pen  50  thereon. 
     In FIG. 16 is shown the tablet computer  100  when it is used for pen input. At the first tilt position, the handle  20  is opened until it describes an acute angle with the rear face of the computer  100 , and the distal end of the tongue piece  21  is directed toward the rear face of the computer  100  and fitted over the engagement protrusion  25 . In other words, the tongue piece  21  serves as a stand for the computer body. 
     At the first tilt position, large gravitational moment is imposed at the center of gravity of the computer  100 , and the inclined state of the handle  20  can not be maintained by only the force of the friction supplied by the bearings  23   a  and  23   b.  In this embodiment, therefore, to maintain the first tilt position, the tongue piece  21  is fitted over the engagement protrusion  25  to halt the rotation of the handle  20  and the tongue piece  21 . 
     Use as display (second tilt position): 
     When the tablet computer  100  is employed as a display, i.e., when it serves not only as the main body but also as a display device, for an operator it is preferable that the flat display panel  11  stand substantially upright relative to the desk surface, i.e., the computer  100  is set at the second tilt position, so that he or she can easily see the display. In this case, an external keyboard may be provided for the computer  100  (see FIG.  10 ), especially for key input. 
     FIG. 17 is a diagram showing the computer  100  when it is used as a display. At the second tilt position, the handle  20  is opened until it describes an obtuse angle with the rear face of the computer  100 . In other words, the handle  20  serves as a stand for the computer  100 . 
     At the second tilt position, a smaller gravitational moment is imposed at the center of gravity of the computer  100 , and the handle  20  in the inclined state can be adequately supported by only the force of the friction supplied by the bearings  23   a  and  23   b.  Since the rubber sheet  22  is elastic, it acts as a stand stopper. 
     Use as a handy-use type computer: 
     The handle  20  in this embodiment, formed into a U shape, can also be used as a handle An operator supports the computer  100  by inserting one hand (not the dominant hand) through the U-shaped handle  20 , and can enter data with the pen  50  while holding the computer  100  in the palm (palmtop operation). 
     In FIG. 18 is shown the way in which the computer  100  is employed as a handy-use type. Since the elastic rubber sheet  22  can function as a buffer member when the handle  20  is used as a hand strap, the stress imposed on the operator&#39;s hand can be reduced. 
     Wall suspension: 
     The U-shaped handle  20  in this embodiment can also be employed as a hook to suspend the computer  100  from a wall. 
     In FIG. 19 is shown the way in which the computer  100  is suspended from a wall. The handle  20  is positioned in the same manner as in FIG. 18, and the center of the handle  20  is placed over a wall hook. 
     With the arrangement described in sub-division A, the assembly of the simple parts provides a plurality of ways in which the handle  20  can be used, as described in sub-division B. It should be fully noted that the tilting mechanism of the computer  100  according to this embodiment is superior as regards manufacturing costs, weight and durability, and has no adverse effect on portability. 
     The present invention has been described in detail while referring to a specific embodiment. However, it should be obvious to one having ordinary skill in the art that various modifications or revisions of the embodiment are possible within the scope of the present invention. That is, although the present invention has been disclosed by using an example, it should not be limited to that example. To fully understand the subject of the present invention, the claims should be referred to. 
     As is described above in detail, according to the present invention, provided is an information processing apparatus that can be appropriately employed in several ways, such as for tablet input or for key input with a keyboard.