Patent Publication Number: US-2003224739-A1

Title: Electronic apparatus including two foldable bodies

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS  
       [0001] This application is based upon and claims the benefit of priority from the prior Japanese Patent Application No. 2002-159515, filed May 31, 2002, the entire contents of which are incorporated herein by reference.  
       BACKGROUND OF THE INVENTION  
       [0002] 1. Field of the Invention  
       [0003] The present invention relates to folding electronic apparatuses such as cellular phones, particularly to a structure for improving operability of electronic apparatuses.  
       [0004] 2. Description of the Related Art  
       [0005] For example, a cellular phone includes a body including keys and a display screen. For this body, miniaturization and weight reduction have been promoted to enhance portability. In this case, when the body is excessively miniaturized, there is a possibility that operability in inputting phone numbers or characters is impaired. Therefore, in recent years, a so-called folding cellular phone has been dominant in which the body is folded during transport and opened to expose the display screen during use.  
       [0006] In “Jpn. Pat. Appln. KOKAI Publication No. 2001-298514, a related-art conventional folding cellular phone is disclosed. The cellular phone is constituted of first and second bodies and a hinge portion. The first body includes a plurality of operation keys such as dial keys for inputting phone numbers and characters. The second body includes a display screen on which input information is displayed. The hinge portion connects the first body to the second body so that the bodies can be pivoted. Therefore, the first and second bodies can be displaced between a first form in which bodies are folded so as to dispose the operation keys opposite to the display screen and a second form in which the bodies are opened so as to expose the operation keys and display screen.  
       [0007] In recent years, many functions have become available on cellular phones. For example, it is possible to access information sites of movies, music, and games via a communication network. The increase in functions on a cellular phone results in an increase in the number of operation keys arranged on the first body. Therefore, the arrangement of the operation keys inevitably becomes complicated.  
       [0008] As a countermeasure, in the above-described cellular phone, a scroll key is disposed in the hinge portion which connects the first body to the second body. The scroll key is operated with the fingertip to move a cursor on the display screen and scroll the display of the functions. This reduces the number of operation keys arranged on the first body, and prevents the arrangement of the operation keys from becoming complicated.  
       [0009] According to the cellular phone, the hinge portion includes an outer peripheral surface which is curved in a circular arc shape. This outer peripheral surface of the hinge portion extends upwards from a boundary portion between the first and second bodies, when the first and second bodies are displaced into the second form. The scroll key is disposed on the outer peripheral surface of the hinge portion.  
       [0010] Additionally, the shape of the hinge portion is much smaller than the shapes of the first and second bodies. Therefore, the types of keys which can be arranged on the hinge portion are restricted, the shape and number of the keys are limited, and the operability of the keys is prevented from being enhanced.  
       BRIEF SUMMARY OF THE INVENTION  
       [0011] According to an embodiment of the present invention, there is provided an electronic apparatus comprising: a first body including a plurality of operation keys; a second body including a display screen; and a hinge portion disposed between the first and second bodies. The hinge portion connects the first body to the second body so that the bodies can be pivoted. The first and second bodies can be displaced between a first form in which the bodies are folded so as to dispose the operation keys opposite to the display screen and a second form in which the bodies are opened so as to expose the operation keys and display screen. An other operation key is disposed on the second body. The other operation key is positioned between the display screen and hinge portion. 
     
    
    
     BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWING  
     [0012] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the invention, and together with the general description given above and the detailed description of the embodiments given below, serve to explain the principles of the invention.  
     [0013]FIG. 1 is a perspective view of a cellular phone according to a first embodiment of the present invention;  
     [0014]FIG. 2 is a plan view of the cellular phone showing that first and second bodies are displaced into a second form in the first embodiment of the present invention;  
     [0015]FIG. 3 is a side view of the cellular phone showing that the first and second bodies are displaced into the second form in the first embodiment of the present invention;  
     [0016]FIG. 4 is a side view of the cellular phone showing that the first and second bodies are displaced into a first form in the first embodiment of the present invention;  
     [0017]FIG. 5 is a perspective view of the cellular phone according to a second embodiment of the present invention;  
     [0018]FIG. 6 is a plan view of the cellular phone showing that the first and second bodies are displaced into the second form in the second embodiment of the present invention;  
     [0019]FIG. 7 is a side view of the cellular phone showing that the first and second bodies are displaced into the second form in the second embodiment of the present invention;  
     [0020]FIG. 8 is a side view of the cellular phone showing that the first and second bodies are displaced into the first form in the second embodiment of the present invention;  
     [0021]FIG. 9 is a plan view of the cellular phone showing that the first and second bodies are displaced into the second form in a third embodiment of the present invention;  
     [0022]FIG. 10 is a side view of the cellular phone showing that the first and second bodies are displaced into the second form in the third embodiment of the present invention; and  
     [0023]FIG. 11 is a side view of the cellular phone showing that the first and second bodies are displaced into the first form in the third embodiment of the present invention. 
    
    
     DETAILED DESCRIPTION OF THE INVENTION  
     [0024] A first embodiment of the present invention will be described hereinafter with reference to FIGS.  1  to  4 .  
     [0025] FIGS.  1  to  4  show a folding cellular phone  1  as an electronic apparatus. The cellular phone  1  includes a first body  2 , second body  3 , and hinge portion  4 . The first body  2  constitutes the main body of the cellular phone  1 . The first body  2  has a flat square box shape, and a length L 1  greater than its width L 2 . The first body  2  includes a flat first surface  2   a , and a plurality of push-type operation keys  5  are disposed on the first surface  2   a . Examples of the operation keys  5  include a dial key for use in inputting phone numbers and characters, a power key for turning ON/OFF the cellular phone  1 , a transmitter/receiver key for use in making or answering a phone call, and the like.  
     [0026] The second body  3  constitutes a display unit of the cellular phone  1 . The second body  3  has a flat square box shape, and a length L 3  greater than its width L 4 . The second body  3  includes a flat second surface  3   a , and a square display screen  6  is disposed in the middle of the second surface  3   a . The display screen  6  displays, for example, the phone numbers, characters, images, and contents of set functions. The length L 3  and width L 4  of the second body  3  are substantially equal to the length L 1  and width L 2  of the first body  2 .  
     [0027] The hinge portion  4  connects the first body  2  to the second body  3  so that the bodies can be pivoted. The hinge portion  4  includes a first support portion  8 , second support portion  9 , and hinge shaft  10 . The first support portion  8  is formed in one end of the first body  2 . The first support portion  8  extends upwards from the first surface  2   a  of the first body  2 , and includes an outer peripheral surface which is bent in a circular arc shape. The second support portion  9  is formed in one end of the second body  3 . The second support portion  9  extends towards the first support portion  8  of the first body  2  from one end of the second body  3 , and includes an outer peripheral surface which is bent in the circular arc shape. The first and second support portions  8  and  9  are arranged in one row in the width direction of the first and second bodies  2  and  3 . The hinge shaft  10  extends in the width direction of the first and second bodies  2  and  3 , and extends through the first and second support portions  8  and  9 .  
     [0028] Therefore, the cellular phone  1  can be displaced between first and second forms centering on an axis O 1  of the hinge shaft  10 . In the first form, the first and second bodies  2  and  3  are folded so that the operation keys  5  are disposed opposite to the display screen  6 . In the second form, the first and second bodies  2  and  3  are opened in one row so that the operation keys  5  and display screen  6  are exposed. As shown in FIGS.  1  to  3 , when the first and second bodies  2  and  3  are opened in the second form, the hinge portion  4  is positioned between the first and second bodies  2  and  3 , and the first surface  2   a  of the first body  2  is positioned on substantially the same plane as that of the second surface  3   a  of the second body  3 .  
     [0029] As shown in FIG. 1, the second surface  3   a  of the second body  3  includes a region  11  disposed between the display screen  6  and hinge portion  4 . Two operation keys  12   a  and  12   b  other than the operation keys  5  are disposed in the region  11 . The operation keys  12   a  and  12   b  are of the push type, depressed with fingertips, and arranged in one row in the width direction of the second body  3  in a position disposed adjacent to the display screen  6 .  
     [0030] One operation key  12   a  is used, for example, to move a cursor on the display screen  6  and to select the content of the function. The other operation key  12   b  is used, for example, to manipulate the content of the function displayed on the display screen  6 . In other words, the operation keys  12   a  and  12   b  are used mainly to browse information using the Internet or to exchange character information (electronic mail) on the Internet. Therefore, during the use of the cellular phone  1  using the Internet, the frequencies of use of the operation keys  12   a  and  12   b  are higher than those of the operation keys  5  of the first body  2 .  
     [0031] According to the first embodiment of the present invention, since the second surface  3   a  of the second body  3  only includes the display screen  6 , it is possible to sufficiently secure a flat and large region  11  between the display screen  6  and hinge portion  4  in the second surface  3   a . Therefore, the operation keys  12   a  and  12   b  which are operated in using the Internet can be disposed in the region  11  of the second surface  3   a . Therefore, the number and type of the operation keys  12   a  and  12   b  are not restricted, and layout of the operation keys  12   a  and  12   b  is easily obtained.  
     [0032] Furthermore, according to the above-described constitution, when the cellular phone  1  is displaced into the second form, the operation keys  12   a  and  12   b  deviate toward the display screen  6  rather than toward the hinge portion  4 . Therefore, when an operator operates the operation keys  12   a  and  12   b  with fingertips, the operator holds a middle portion of the cellular phone  1  displaced in the second form along the length direction, and the operator&#39;s hand extends over both the first and second bodies  2  and  3 .  
     [0033] As a result, the cellular phone  1  can be firmly supported with one hand, and the posture of the cellular phone  1  is stabilized. Therefore, the operability of the operation keys  12   a  and  12   b  becomes satisfactory, and it is possible to obtain the cellular phone  1  which is easy to use.  
     [0034] It is to be noted that the present invention is not limited to the first embodiment. FIGS.  5  to  8  show a second embodiment of the present invention.  
     [0035] The cellular phone  1  of the second embodiment is different from that of the first embodiment in a constitution of a portion for connecting the first body  2  to the second body  3 . The other basic constitution of the cellular phone  1  is similar to that of the first embodiment. Therefore, in the second embodiment, the same constituting portions as those of the first embodiment are denoted with the same reference numerals, and the description thereof is omitted.  
     [0036] As shown in FIGS.  5  to  8 , the cellular phone  1  includes a third body  21 . The third body  21  is disposed between the first body  2  and second body  3 . The third body  21  includes a first end  21   a  and second end  21   b . The second end  21   b  is positioned on the opposite side of the first end  21   a . The first end  21   a  of the third body  21  is pivotably connected to one end of the first body  2  via a first hinge shaft  23   a . The second end  21   b  of the third body  21  is pivotably connected to one end of the second body  3  via a second hinge shaft  23   b . The first and second hinge shafts  23   a  and  23   b  are disposed in parallel with each other along the width direction of the first to third bodies  2 ,  3  and  21 . Therefore, the third body  21  extends between the first body  2  and second body  3  and connects the first body to the second body so that the bodies can be pivoted.  
     [0037] By this connection, the cellular phone  1  can be displaced between the first and second forms centering on an axis O 2  of the first and second hinge shafts  23   a  and  23   b . In the first form, the first and second bodies  2  and  3  are folded so that the operation keys  5  are disposed opposite to the display screen  6 . In the second form, the first and second bodies  2  and  3  are opened in one row so that the operation keys  5  and display screen  6  are exposed.  
     [0038] The third body  21  has a flat box shape, and has a length L 5  and width L 6 . The length L 5  of the third body  21  is smaller than the thickness of the cellular phone  1  at the time when the first and second bodies  2  and  3  are displaced in the first form. The width L 6  of the third body  21  is equal to the widths L 2  and L 4  of the first and second bodies  2  and  3 . Therefore, the width L 6  of the third body  21  is greater than the length L 5 .  
     [0039] As shown in FIGS. 5 and 6, when the cellular phone  1  is displaced in the second form, the third body  21  is positioned between the first and second bodies  2  and  3 . This third body  21  has a flat third surface  24 . When the cellular phone  1  is displaced in the second form, the third surface  24  is connected to the first surface  2   a  of the first body  2  and the second surface  3   a  of the second body  3 , and is positioned right under the display screen  6 .  
     [0040] First to fourth other operation keys  25   a  to  25   d  of push type are disposed on the third surface  24 . The first to fourth operation keys  25   a  to  25   d  are used to manipulate the content of the functions displayed on the display screen  6 . The first to third operation keys  25   a  to  25   c  are arranged in one row in the width direction of the third body  21  in a position disposed adjacent to a lower edge of the display screen  6 . The fourth operation key  25   d  is used to move the cursor on the display screen  6  and to select the content of the function, and is positioned in a middle portion of the third surface  24 . Therefore, the first to fourth operation keys  25   a  to  25   d  are used mainly to browse information using the Internet or exchange electronic mail. In the use of the cellular phone  1  using the Internet, the first to fourth operation keys  25   a  to  25   d  have higher frequencies of use than those of the operation keys  5  of the first body  2 .  
     [0041] As shown in FIG. 8, when the cellular phone  1  is displaced in the first form, the third body  21  is held in a posture along the thickness direction of the cellular phone  1 . Therefore, the third surface  24  of the third body  21  is covered with the first and second bodies  2  and  3 .  
     [0042] According to the constitution, the first body  2  is pivotably connected to the second body  3  via the separate third body  21 . When the cellular phone  1  is displaced in the second form, the third body  21  has the flat third surface  24  continued to the first and second surfaces  2   a  and  3   a . Therefore, it is possible to secure a sufficient area of the third surface  24 . The first to fourth operation keys  25   a  to  25   d  operated mainly in using the Internet can be disposed on the third surface  24 .  
     [0043] Therefore, the number and type of the first to fourth operation keys  25   a  to  25   d  are not easily restricted, and the degree of freedom in the layout of the operation keys  25   a  to  25   d  increases.  
     [0044] Furthermore, the third body  21  is positioned between the first and second bodies  2  and  3 , when the cellular phone  1  is used. Therefore, when the first to fourth operation keys  25   a  to  25   d  are operated with fingertips, the operator manually holds the middle portion of the cellular phone  1  displaced in the second form along the length direction, and the operator&#39;s hand extends to both the first body  2  and third body  21 . Therefore, the cellular phone  1  can be firmly supported with one hand, and the operability of the first to fourth operation keys  25   a  to  25   d  becomes satisfactory.  
     [0045] Additionally, according to the above-described constitution, a broad range of the second surface  3   a  of the second body  3  can be used as an installation region of the display screen  6 . Therefore, the size of the display screen  6  is not limited by the first to fourth operation keys  25   a  to  25   d , and the display screen  6  can be enlarged.  
     [0046] FIGS.  9  to  11  show a third embodiment of the present invention.  
     [0047] The third embodiment is a development of the second embodiment. As shown in FIG. 9, the length L 3  of the second body  3  is greater than the length L 1  of the first body  2 . The length L 5  of the third body  21  is smaller than the length L 1  or L 3  of the first or second body  2  or  3 , but is greater than that of the third body  21  of the second embodiment.  
     [0048]FIG. 11 shows that the cellular phone  1  is displaced in the first form. In the first form, the third body  21  is held in an inclined posture with respect to the first and second bodies  2  and  3 , and the third surface  24  of the third body  21  is disposed opposite to a part of the second surface  3   a  of the second body  3 . Therefore, as long as the cellular phone  1  is displaced in the first form, the second surface  3   a  of the second body  3  is covered with the first body  2  and third body  21 .  
     [0049] Furthermore, in the above-described constitution, when the cellular phone  1  is displaced in the first form, the third surface  24  of the third body  21  is disposed opposite to a part of the second surface  3   a  of the second body  3 . Therefore, the portion of the second surface  3   a  disposed opposite to the third surface  24  includes a slant surface  27 . The slant surface  27  tilts in a direction in which the thickness of the second body  3  is reduced toward the direction of the third body  21 . Because of the presence of the slant surface  27 , these first to third bodies  2 ,  3  and  21  can be folded so that the third body  21  and first body  2  overlap with the second body  3 .  
     [0050] As shown in FIG. 9, one end of the display screen  6  extends to reach the slant surface  27 , so that the display screen  6  is enlarged. Additionally, when the cellular phone  1  is displaced in the first form, tip ends of the first and second bodies  2  and  3  on the side opposite to the third body  21  deviate in the length direction of the bodies  2  and  3 , and a step  28  is formed between the tip ends as shown in FIG. 11.  
     [0051] Therefore, in the present embodiment, the tip end of the second surface  3   a  of the second body  3  is exposed without being covered with the first body  2 , and can be caught by the fingertips. Therefore, to displace the cellular phone  1  to the second form from the first form, a fingertip is first inserted in the step  28  to catch the second surface  3   a . Thereby, the second body  3  can be pivoted in a direction apart from the first body  2 , and the cellular phone  1  can easily be opened.  
     [0052] According to the third embodiment, since the length L 3  of the first body  2  is greater than the length L 1  or L 5  of the first or third body  2  or  21 , the area of the second surface  3   a  increases. Therefore, the display screen  6  can further be enlarged, and the display screen  6  can easily be seen.  
     [0053] Furthermore, when the cellular phone  1  is displaced in the second form, the third body  21  is positioned between the first body  2  and second body  3 , and therefore the operator manually holds the middle portion of the cellular phone  1  displaced in the second form along the length direction. Therefore, the operator can firmly support the cellular phone  1  with one hand in operating the first to fourth operation keys  25   a  to  25   d , and the posture of the cellular phone  1  is stabilized.  
     [0054] In the above-described embodiments, the operation keys disposed in the positions other than the first body are of the push type, but the present invention is not limited to this. For example, rotary operation keys such as a dial, an input device of a touch or stick type, or acu-points may also be used.  
     [0055] Furthermore, the electronic apparatus according to the present invention is not limited to the cellular phone. For example, the present invention can also be applied to information apparatuses such as an electronic notebook or personal digital assistants (PDA).  
     [0056] Additional advantages and modifications will readily occur to those skilled in the art. Therefore, the invention in its broader aspects is not limited to the specific details and representative embodiments shown and described herein. Accordingly, various modifications may be made without departing from the spirit or scope of the general invention concept as defined by the appended claims and their equivalents.